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• Direct3D - Zooming into Mouse Position

  - by roohan

  I'm trying to implement my camera class for a simulation. But I cant figure out how to zoom into my world based on the mouse position. I mean the object under the mouse cursor should remain at the same screen position. My zooming looks like this: VOID ZoomIn(D3DXMATRIX& WorldMatrix, FLOAT const& MouseX, FLOAT const& MouseY) { this->Position.z = this->Position.z * 0.9f; D3DXMatrixLookAtLH(&this->ViewMatrix, &this->Position, &this->Target, &this->UpDirection); } I passed the world matrix to the function because I had the idea to move my drawing origin according to the mouse position. But I cant find out how to calculate the offset in to move my drawing origin. Anyone got an idea how to calculate this? Thanks in advance. SOLVED Ok I solved my problem. Here is the code if anyone is interested: VOID CAMERA2D::ZoomIn(FLOAT const& MouseX, FLOAT const& MouseY) { // Get the setting of the current view port. D3DVIEWPORT9 ViewPort; this->Direct3DDevice->GetViewport(&ViewPort); // Convert the screen coordinates of the mouse to world space coordinates. D3DXVECTOR3 VectorOne; D3DXVECTOR3 VectorTwo; D3DXVec3Unproject(&VectorOne, &D3DXVECTOR3(MouseX, MouseY, 0.0f), &ViewPort, &this->ProjectionMatrix, &this->ViewMatrix, &WorldMatrix); D3DXVec3Unproject(&VectorTwo, &D3DXVECTOR3(MouseX, MouseY, 1.0f), &ViewPort, &this->ProjectionMatrix, &this->ViewMatrix, &WorldMatrix); // Calculate the resulting vector components. float WorldZ = 0.0f; float WorldX = ((WorldZ - VectorOne.z) * (VectorTwo.x - VectorOne.x)) / (VectorTwo.z - VectorOne.z) + VectorOne.x; float WorldY = ((WorldZ - VectorOne.z) * (VectorTwo.y - VectorOne.y)) / (VectorTwo.z - VectorOne.z) + VectorOne.y; // Move the camera into the screen. this->Position.z = this->Position.z * 0.9f; D3DXMatrixLookAtLH(&this->ViewMatrix, &this->Position, &this->Target, &this->UpDirection); // Calculate the world space vector again based on the new view matrix, D3DXVec3Unproject(&VectorOne, &D3DXVECTOR3(MouseX, MouseY, 0.0f), &ViewPort, &this->ProjectionMatrix, &this->ViewMatrix, &WorldMatrix); D3DXVec3Unproject(&VectorTwo, &D3DXVECTOR3(MouseX, MouseY, 1.0f), &ViewPort, &this->ProjectionMatrix, &this->ViewMatrix, &WorldMatrix); // Calculate the resulting vector components. float WorldZ2 = 0.0f; float WorldX2 = ((WorldZ2 - VectorOne.z) * (VectorTwo.x - VectorOne.x)) / (VectorTwo.z - VectorOne.z) + VectorOne.x; float WorldY2 = ((WorldZ2 - VectorOne.z) * (VectorTwo.y - VectorOne.y)) / (VectorTwo.z - VectorOne.z) + VectorOne.y; // Create a temporary translation matrix for calculating the origin offset. D3DXMATRIX TranslationMatrix; D3DXMatrixIdentity(&TranslationMatrix); // Calculate the origin offset. D3DXMatrixTranslation(&TranslationMatrix, WorldX2 - WorldX, WorldY2 - WorldY, 0.0f); // At the offset to the cameras world matrix. this->WorldMatrix = this->WorldMatrix * TranslationMatrix; } Maybe someone has even a better solution than mine.

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• What Exactly is CSS and Can it Better Your Website?

  Cascading Style Sheets or CSS are the design side of HTML. In other words Style Sheets are the clothing you put over a web pages HTML to design fonts, colors, layouts, and the arrangement and separation of elements on the page.

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• Stored Procedure call with parameters in ASP.NET MVC

  - by cc0

  I have a working controller for another stored procedure in the database, but I am trying to test another. When I request the URL; http://host.com/Map?minLat=0&maxLat=50&minLng=0&maxLng=50 I get the following error message, which is understandable but I can't seem to find out why it occurs; Procedure or function 'esp_GetPlacesWithinGeoSpan' expects parameter '@MinLat', which was not supplied. This is the code I am using. using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using System.Web.Mvc.Ajax; using System.Data; using System.Text; using System.Data.SqlClient; namespace prototype.Controllers { public class MapController : Controller { //Initial variable definitions //Array with chars to be used with the Trim() methods char[] lastComma = { ',' }; //Minimum and maximum lat/longs for queries float _minLat; float _maxLat; float _minLng; float _maxLng; //Creates stringbuilder object to store SQL results StringBuilder json = new StringBuilder(); //Defines which SQL-server to connect to, which database, and which user SqlConnection con = new SqlConnection(...connection string here...); // // HTTP-GET: /Map/ public string CallProcedure_getPlaces(float minLat, float maxLat, float minLng, float maxLng) { con.Open(); using (SqlCommand cmd = new SqlCommand("esp_GetPlacesWithinGeoSpan", con)) { cmd.CommandType = CommandType.Text; cmd.Parameters.AddWithValue("@MinLat", _minLat); cmd.Parameters.AddWithValue("@MaxLat", _maxLat); cmd.Parameters.AddWithValue("@MinLng", _minLng); cmd.Parameters.AddWithValue("@MaxLng", _maxLng); using (SqlDataReader reader = cmd.ExecuteReader()) { while (reader.Read()) { json.AppendFormat("\"{0}\":{{\"c\":{1},\"f\":{2}}},", reader["PlaceID"], reader["PlaceName"], reader["SquareID"]); } } con.Close(); } return "{" + json.ToString().TrimEnd(lastComma) + "}"; } //http://host.com/Map?minLat=0&maxLat=50&minLng=0&maxLng=50 public ActionResult Index(float minLat, float maxLat, float minLng, float maxLng) { _minLat = minLat; _maxLat = maxLat; _minLng = minLng; _maxLng = maxLng; return Content(CallProcedure_getPlaces(_minLat, _maxLat, _minLng, _maxLng)); } } } Any help on resolving this problem would be greatly appreciated.

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• How to get fully qualified path of css file?

  - by Malcolm

  Hi, In ASP.NET MVC how do I get the fully qualified path to my css file by specifying the relative path. Eg Url.Content("~/Content/Print.css") This returns eg "/Content/Print.css" Where as I want http://www.mysite.com/Content/Printcss Understand the issue? Malcolm

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• Issues with HLSL and lighting

  - by numerical25

  I am trying figure out whats going on with my HLSL code but I have no way of debugging it cause C++ gives off no errors. The application just closes when I run it. I am trying to add lighting to a 3d plane I made. below is my HLSL. The problem consist when my Pixel shader method returns the struct "outColor" . If I change the return value back to the struct "psInput" , everything goes back to working again. My light vectors and colors are at the top of the fx file // PS_INPUT - input variables to the pixel shader // This struct is created and fill in by the // vertex shader cbuffer Variables { matrix Projection; matrix World; float TimeStep; }; struct PS_INPUT { float4 Pos : SV_POSITION; float4 Color : COLOR0; float3 Normal : TEXCOORD0; float3 ViewVector : TEXCOORD1; }; float specpower = 80.0f; float3 camPos = float3(0.0f, 9.0, -256.0f); float3 DirectLightColor = float3(1.0f, 1.0f, 1.0f); float3 DirectLightVector = float3(0.0f, 0.602f, 0.70f); float3 AmbientLightColor = float3(1.0f, 1.0f, 1.0f); /*************************************** * Lighting functions ***************************************/ /********************************* * CalculateAmbient - * inputs - * vKa material's reflective color * lightColor - the ambient color of the lightsource * output - ambient color *********************************/ float3 CalculateAmbient(float3 vKa, float3 lightColor) { float3 vAmbient = vKa * lightColor; return vAmbient; } /********************************* * CalculateDiffuse - * inputs - * material color * The color of the direct light * the local normal * the vector of the direct light * output - difuse color *********************************/ float3 CalculateDiffuse(float3 baseColor, float3 lightColor, float3 normal, float3 lightVector) { float3 vDiffuse = baseColor * lightColor * saturate(dot(normal, lightVector)); return vDiffuse; } /********************************* * CalculateSpecular - * inputs - * viewVector * the direct light vector * the normal * output - specular highlight *********************************/ float CalculateSpecular(float3 viewVector, float3 lightVector, float3 normal) { float3 vReflect = reflect(lightVector, normal); float fSpecular = saturate(dot(vReflect, viewVector)); fSpecular = pow(fSpecular, specpower); return fSpecular; } /********************************* * LightingCombine - * inputs - * ambient component * diffuse component * specualr component * output - phong color color *********************************/ float3 LightingCombine(float3 vAmbient, float3 vDiffuse, float fSpecular) { float3 vCombined = vAmbient + vDiffuse + fSpecular.xxx; return vCombined; } //////////////////////////////////////////////// // Vertex Shader - Main Function /////////////////////////////////////////////// PS_INPUT VS(float4 Pos : POSITION, float4 Color : COLOR, float3 Normal : NORMAL) { PS_INPUT psInput; float4 newPosition; newPosition = Pos; newPosition.y = sin((newPosition.x * TimeStep) + (newPosition.z / 3.0f)) * 5.0f; // Pass through both the position and the color psInput.Pos = mul(newPosition , Projection ); psInput.Color = Color; psInput.ViewVector = normalize(camPos - psInput.Pos); return psInput; } /////////////////////////////////////////////// // Pixel Shader /////////////////////////////////////////////// //Anthony!!!!!!!!!!! Find out how color works when multiplying them float4 PS(PS_INPUT psInput) : SV_Target { float3 normal = -normalize(psInput.Normal); float3 vAmbient = CalculateAmbient(psInput.Color, AmbientLightColor); float3 vDiffuse = CalculateDiffuse(psInput.Color, DirectLightColor, normal, DirectLightVector); float fSpecular = CalculateSpecular(psInput.ViewVector, DirectLightVector, normal); float4 outColor; outColor.rgb = LightingCombine(vAmbient, vDiffuse, fSpecular); outColor.a = 1.0f; //Below is where the error begins return outColor; } // Define the technique technique10 Render { pass P0 { SetVertexShader( CompileShader( vs_4_0, VS() ) ); SetGeometryShader( NULL ); SetPixelShader( CompileShader( ps_4_0, PS() ) ); } } Below is some of my c++ code. Reason I am showing this is because it is pretty much what creates the surface normals for my shaders to evaluate. for the lighting for(int z=0; z < NUM_ROWS; ++z) { for(int x = 0; x < NUM_COLS; ++x) { int curVertex = x + (z * NUM_VERTSX); indices[curIndex] = curVertex; indices[curIndex + 1] = curVertex + NUM_VERTSX; indices[curIndex + 2] = curVertex + 1; D3DXVECTOR3 v0 = vertices[indices[curIndex]].pos; D3DXVECTOR3 v1 = vertices[indices[curIndex + 1]].pos; D3DXVECTOR3 v2 = vertices[indices[curIndex + 2]].pos; D3DXVECTOR3 normal; D3DXVECTOR3 cross; D3DXVec3Cross(&cross, &D3DXVECTOR3(v2 - v0),&D3DXVECTOR3(v1 - v0)); D3DXVec3Normalize(&normal, &cross); vertices[indices[curIndex]].normal = normal; vertices[indices[curIndex + 1]].normal = normal; vertices[indices[curIndex + 2]].normal = normal; indices[curIndex + 3] = curVertex + 1; indices[curIndex + 4] = curVertex + NUM_VERTSX; indices[curIndex + 5] = curVertex + NUM_VERTSX + 1; v0 = vertices[indices[curIndex + 3]].pos; v1 = vertices[indices[curIndex + 4]].pos; v2 = vertices[indices[curIndex + 5]].pos; D3DXVec3Cross(&cross, &D3DXVECTOR3(v2 - v0),&D3DXVECTOR3(v1 - v0)); D3DXVec3Normalize(&normal, &cross); vertices[indices[curIndex + 3]].normal = normal; vertices[indices[curIndex + 4]].normal = normal; vertices[indices[curIndex + 5]].normal = normal; curIndex += 6; } } and below is my c++ code, in it's entirety. showing the drawing and also calling on the passes #include "MyGame.h" //#include "CubeVector.h" /* This code sets a projection and shows a turning cube. What has been added is the project, rotation and a rasterizer to change the rasterization of the cube. The issue that was going on was something with the effect file which was causing the vertices not to be rendered correctly.*/ typedef struct { ID3D10Effect* pEffect; ID3D10EffectTechnique* pTechnique; //vertex information ID3D10Buffer* pVertexBuffer; ID3D10Buffer* pIndicesBuffer; ID3D10InputLayout* pVertexLayout; UINT numVertices; UINT numIndices; }ModelObject; ModelObject modelObject; // World Matrix D3DXMATRIX WorldMatrix; // View Matrix D3DXMATRIX ViewMatrix; // Projection Matrix D3DXMATRIX ProjectionMatrix; ID3D10EffectMatrixVariable* pProjectionMatrixVariable = NULL; //grid information #define NUM_COLS 16 #define NUM_ROWS 16 #define CELL_WIDTH 32 #define CELL_HEIGHT 32 #define NUM_VERTSX (NUM_COLS + 1) #define NUM_VERTSY (NUM_ROWS + 1) // timer variables LARGE_INTEGER timeStart; LARGE_INTEGER timeEnd; LARGE_INTEGER timerFreq; double currentTime; float anim_rate; // Variable to hold how long since last frame change float lastElaspedFrame = 0; // How long should the frames last float frameDuration = 0.5; bool MyGame::InitDirect3D() { if(!DX3dApp::InitDirect3D()) { return false; } // Get the timer frequency QueryPerformanceFrequency(&timerFreq); float freqSeconds = 1.0f / timerFreq.QuadPart; lastElaspedFrame = 0; D3D10_RASTERIZER_DESC rastDesc; rastDesc.FillMode = D3D10_FILL_WIREFRAME; rastDesc.CullMode = D3D10_CULL_FRONT; rastDesc.FrontCounterClockwise = true; rastDesc.DepthBias = false; rastDesc.DepthBiasClamp = 0; rastDesc.SlopeScaledDepthBias = 0; rastDesc.DepthClipEnable = false; rastDesc.ScissorEnable = false; rastDesc.MultisampleEnable = false; rastDesc.AntialiasedLineEnable = false; ID3D10RasterizerState *g_pRasterizerState; mpD3DDevice->CreateRasterizerState(&rastDesc, &g_pRasterizerState); mpD3DDevice->RSSetState(g_pRasterizerState); // Set up the World Matrix D3DXMatrixIdentity(&WorldMatrix); D3DXMatrixLookAtLH(&ViewMatrix, new D3DXVECTOR3(200.0f, 60.0f, -20.0f), new D3DXVECTOR3(200.0f, 50.0f, 0.0f), new D3DXVECTOR3(0.0f, 1.0f, 0.0f)); // Set up the projection matrix D3DXMatrixPerspectiveFovLH(&ProjectionMatrix, (float)D3DX_PI * 0.5f, (float)mWidth/(float)mHeight, 0.1f, 100.0f); pTimeVariable = NULL; if(!CreateObject()) { return false; } return true; } //These are actions that take place after the clearing of the buffer and before the present void MyGame::GameDraw() { static float rotationAngle = 0.0f; // create the rotation matrix using the rotation angle D3DXMatrixRotationY(&WorldMatrix, rotationAngle); rotationAngle += (float)D3DX_PI * 0.0f; // Set the input layout mpD3DDevice->IASetInputLayout(modelObject.pVertexLayout); // Set vertex buffer UINT stride = sizeof(VertexPos); UINT offset = 0; mpD3DDevice->IASetVertexBuffers(0, 1, &modelObject.pVertexBuffer, &stride, &offset); mpD3DDevice->IASetIndexBuffer(modelObject.pIndicesBuffer, DXGI_FORMAT_R32_UINT, 0); pTimeVariable->SetFloat((float)currentTime); // Set primitive topology mpD3DDevice->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST); // Combine and send the final matrix to the shader D3DXMATRIX finalMatrix = (WorldMatrix * ViewMatrix * ProjectionMatrix); pProjectionMatrixVariable->SetMatrix((float*)&finalMatrix); // make sure modelObject is valid // Render a model object D3D10_TECHNIQUE_DESC techniqueDescription; modelObject.pTechnique->GetDesc(&techniqueDescription); // Loop through the technique passes for(UINT p=0; p < techniqueDescription.Passes; ++p) { modelObject.pTechnique->GetPassByIndex(p)->Apply(0); // draw the cube using all 36 vertices and 12 triangles mpD3DDevice->DrawIndexed(modelObject.numIndices,0,0); } } //Render actually incapsulates Gamedraw, so you can call data before you actually clear the buffer or after you //present data void MyGame::Render() { // Get the start timer count QueryPerformanceCounter(&timeStart); currentTime += anim_rate; DX3dApp::Render(); QueryPerformanceCounter(&timeEnd); anim_rate = ( (float)timeEnd.QuadPart - (float)timeStart.QuadPart ) / timerFreq.QuadPart; } bool MyGame::CreateObject() { VertexPos vertices[NUM_VERTSX * NUM_VERTSY]; for(int z=0; z < NUM_VERTSY; ++z) { for(int x = 0; x < NUM_VERTSX; ++x) { vertices[x + z * NUM_VERTSX].pos.x = (float)x * CELL_WIDTH; vertices[x + z * NUM_VERTSX].pos.z = (float)z * CELL_HEIGHT; vertices[x + z * NUM_VERTSX].pos.y = (float)(rand() % CELL_HEIGHT); vertices[x + z * NUM_VERTSX].color = D3DXVECTOR4(1.0, 0.0f, 0.0f, 0.0f); } } DWORD indices[NUM_VERTSX * NUM_VERTSY * 6]; int curIndex = 0; for(int z=0; z < NUM_ROWS; ++z) { for(int x = 0; x < NUM_COLS; ++x) { int curVertex = x + (z * NUM_VERTSX); indices[curIndex] = curVertex; indices[curIndex + 1] = curVertex + NUM_VERTSX; indices[curIndex + 2] = curVertex + 1; D3DXVECTOR3 v0 = vertices[indices[curIndex]].pos; D3DXVECTOR3 v1 = vertices[indices[curIndex + 1]].pos; D3DXVECTOR3 v2 = vertices[indices[curIndex + 2]].pos; D3DXVECTOR3 normal; D3DXVECTOR3 cross; D3DXVec3Cross(&cross, &D3DXVECTOR3(v2 - v0),&D3DXVECTOR3(v1 - v0)); D3DXVec3Normalize(&normal, &cross); vertices[indices[curIndex]].normal = normal; vertices[indices[curIndex + 1]].normal = normal; vertices[indices[curIndex + 2]].normal = normal; indices[curIndex + 3] = curVertex + 1; indices[curIndex + 4] = curVertex + NUM_VERTSX; indices[curIndex + 5] = curVertex + NUM_VERTSX + 1; v0 = vertices[indices[curIndex + 3]].pos; v1 = vertices[indices[curIndex + 4]].pos; v2 = vertices[indices[curIndex + 5]].pos; D3DXVec3Cross(&cross, &D3DXVECTOR3(v2 - v0),&D3DXVECTOR3(v1 - v0)); D3DXVec3Normalize(&normal, &cross); vertices[indices[curIndex + 3]].normal = normal; vertices[indices[curIndex + 4]].normal = normal; vertices[indices[curIndex + 5]].normal = normal; curIndex += 6; } } //Create Layout D3D10_INPUT_ELEMENT_DESC layout[] = { {"POSITION",0,DXGI_FORMAT_R32G32B32_FLOAT, 0 , 0, D3D10_INPUT_PER_VERTEX_DATA, 0}, {"COLOR",0,DXGI_FORMAT_R32G32B32A32_FLOAT, 0 , 12, D3D10_INPUT_PER_VERTEX_DATA, 0}, {"NORMAL",0,DXGI_FORMAT_R32G32B32A32_FLOAT, 0 , 28, D3D10_INPUT_PER_VERTEX_DATA, 0} }; UINT numElements = (sizeof(layout)/sizeof(layout[0])); modelObject.numVertices = sizeof(vertices)/sizeof(VertexPos); //Create buffer desc D3D10_BUFFER_DESC bufferDesc; bufferDesc.Usage = D3D10_USAGE_DEFAULT; bufferDesc.ByteWidth = sizeof(VertexPos) * modelObject.numVertices; bufferDesc.BindFlags = D3D10_BIND_VERTEX_BUFFER; bufferDesc.CPUAccessFlags = 0; bufferDesc.MiscFlags = 0; D3D10_SUBRESOURCE_DATA initData; initData.pSysMem = vertices; //Create the buffer HRESULT hr = mpD3DDevice->CreateBuffer(&bufferDesc, &initData, &modelObject.pVertexBuffer); if(FAILED(hr)) return false; modelObject.numIndices = sizeof(indices)/sizeof(DWORD); bufferDesc.ByteWidth = sizeof(DWORD) * modelObject.numIndices; bufferDesc.BindFlags = D3D10_BIND_INDEX_BUFFER; initData.pSysMem = indices; hr = mpD3DDevice->CreateBuffer(&bufferDesc, &initData, &modelObject.pIndicesBuffer); if(FAILED(hr)) return false; ///////////////////////////////////////////////////////////////////////////// //Set up fx files LPCWSTR effectFilename = L"effect.fx"; modelObject.pEffect = NULL; hr = D3DX10CreateEffectFromFile(effectFilename, NULL, NULL, "fx_4_0", D3D10_SHADER_ENABLE_STRICTNESS, 0, mpD3DDevice, NULL, NULL, &modelObject.pEffect, NULL, NULL); if(FAILED(hr)) return false; pProjectionMatrixVariable = modelObject.pEffect->GetVariableByName("Projection")->AsMatrix(); pTimeVariable = modelObject.pEffect->GetVariableByName("TimeStep")->AsScalar(); //Dont sweat the technique. Get it! LPCSTR effectTechniqueName = "Render"; modelObject.pTechnique = modelObject.pEffect->GetTechniqueByName(effectTechniqueName); if(modelObject.pTechnique == NULL) return false; //Create Vertex layout D3D10_PASS_DESC passDesc; modelObject.pTechnique->GetPassByIndex(0)->GetDesc(&passDesc); hr = mpD3DDevice->CreateInputLayout(layout, numElements, passDesc.pIAInputSignature, passDesc.IAInputSignatureSize, &modelObject.pVertexLayout); if(FAILED(hr)) return false; return true; }

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• jquery - establishing truths when loading inline javascript via AJAX

  - by yaya3

  I have thrown together a quick prototype to try and establish a few very basic truths regarding what inline JavaScript can do when it is loaded with AJAX: index.html <html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> </head> <body> <script type="text/javascript"> $('p').css('color','white'); alert($('p').css('color')); // DISPLAYS FIRST but is "undefined" $(document).ready(function(){ $('#ajax-loaded-content-wrapper').load('loaded-by-ajax.html', function(){ $('p').css('color','grey'); alert($('p').css('color')); // DISPLAYS LAST (as expected) }); $('p').css('color','purple'); alert($('p').css('color')); // DISPLAYS SECOND }); </script> <p>Content not loaded by ajax</p> <div id="ajax-loaded-content-wrapper"> </div> </body> </html> loaded-by-ajax.html <p>Some content loaded by ajax</p> <script type="text/javascript"> $('p').css('color','yellow'); alert($('p').css('color')); // DISPLAYS THIRD $(document).ready(function(){ $('p').css('color','pink'); alert($('p').css('color')); // DISPLAYS FOURTH }); </script> <p>Some content loaded by ajax</p> <script type="text/javascript"> $(document).ready(function(){ $('p').css('color','blue'); alert($('p').css('color')); // DISPLAYS FIFTH }); $('p').css('color','green'); alert($('p').css('color')); // DISPLAYS SIX </script> <p>Some content loaded by ajax</p> Notes: a) All of the above (except the first) successfully change the colour of all the paragraphs (in firefox 3.6.3). b) I've used alert instead of console.log as console is undefined when called in the 'loaded' HTML. Truths(?): $(document).ready() does not treat the 'loaded' HTML as a new document, or reread the entire DOM tree including the loaded HTML JavaScript that is contained inside 'loaded' HTML can effect the style of existing DOM nodes One can successfully use the jQuery library inside 'loaded' HTML to effect the style of existing DOM nodes One can not use the firebug inside 'loaded' HTML can effect the existing DOM (proven by Note a) Am I correct in deriving these 'truths' from my tests (test validity)? If not, how would you test for these?

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• jquery - loading inline javascript via AJAX

  - by yaya3

  I have thrown together a quick prototype to try and establish a few very basic truths regarding what inline JavaScript can do when it is loaded with AJAX: index.html <html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> </head> <body> <script type="text/javascript"> $('p').css('color','white'); alert($('p').css('color')); // DISPLAYS FIRST but is "undefined" $(document).ready(function(){ $('#ajax-loaded-content-wrapper').load('loaded-by-ajax.html', function(){ $('p').css('color','grey'); alert($('p').css('color')); // DISPLAYS LAST (as expected) }); $('p').css('color','purple'); alert($('p').css('color')); // DISPLAYS SECOND }); </script> <p>Content not loaded by ajax</p> <div id="ajax-loaded-content-wrapper"> </div> </body> </html> loaded-by-ajax.html <p>Some content loaded by ajax</p> <script type="text/javascript"> $('p').css('color','yellow'); alert($('p').css('color')); // DISPLAYS THIRD $(document).ready(function(){ $('p').css('color','pink'); alert($('p').css('color')); // DISPLAYS FOURTH }); </script> <p>Some content loaded by ajax</p> <script type="text/javascript"> $(document).ready(function(){ $('p').css('color','blue'); alert($('p').css('color')); // DISPLAYS FIFTH }); $('p').css('color','green'); alert($('p').css('color')); // DISPLAYS SIX </script> <p>Some content loaded by ajax</p> Notes: a) All of the above (except the first) successfully change the colour of all the paragraphs (in firefox 3.6.3). b) I've used alert instead of console.log as console is undefined when called in the 'loaded' HTML. Truths(?): $(document).ready() does not treat the 'loaded' HTML as a new document, or reread the entire DOM tree including the loaded HTML, it is pointless inside AJAX loaded content JavaScript that is contained inside 'loaded' HTML can effect the style of existing DOM nodes One can successfully use the jQuery library inside 'loaded' HTML to effect the style of existing DOM nodes One can not use the firebug inside 'loaded' HTML can effect the existing DOM (proven by Note a) Am I correct in deriving these 'truths' from my tests (test validity)? If not, how would you test for these?

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• subfig package in latex

  - by Tim

  Hi, When I am using subfig package in latex, it gives some errors: Package subfig Warning: Your document class has a bad definition of \endfigure, most likely \let\endfigure=\end@float which has now been changed to \def\endfigure{\end@float} because otherwise subsequent changes to \end@float (like done by several packages changing float behaviour) can't take effect on \endfigure. Please complain to your document class author. Package subfig Warning: Your document class has a bad definition of \endtable, most likely \let\endtable=\end@float which has now been changed to \def\endtable{\end@float} because otherwise subsequent changes to \end@float (like done by several packages changing float behaviour) can't take effect on \endtable. Please complain to your document class author. (/usr/share/texmf/tex/latex/caption/caption.sty `rotating' package detected `float' package detected ) LaTeX Warning: You have requested, on input line 139, version `2005/06/26' of package caption, but only version `1995/04/05 v1.4b caption package (AS)' is available. ! Undefined control sequence. l.163 \DeclareCaptionOption {listofformat}{\caption@setlistofformat{#1}} How can I solve it? Thanks and regards!

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• How to get fan list of Facebook page or can overwite facebook social plugin css?

  - by Vaibhav Bhalke

  Hi, We are trying it with facebook social plugin. The HTML code for it as follow: <iframe border='0' src='http://www.facebook.com/plugins/likebox.php?id=1185611481&width=243&height=400&connections=15&stream=false&header=false' scrolling='yes' frameborder='0' allowTransparency='false' style='border:0px; overflow:hidden; width:243px; height:300px; background-color: #03869E; color: white;'> <iframe> As it replace inner HTML of frame on load. We want our own CSS to apply to this HTML. But as it replace whole HTML and it have its own CSS we are unable to set our CSS. We are doing this in GWT. Is there any way we can get the list of fans so we can display it as we want and can apply css? Or check given user is fan of page?

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• Why differs floating-point precision in C# when separated by parantheses and when separated by state

  - by Andreas Larsen

  I am aware of how floating point precision works in the regular cases, but I stumbled on an odd situation in my C# code. Why aren't result1 and result2 the exact same floating point value here? const float A; // Arbitrary value const float B; // Arbitrary value float result1 = (A*B)*dt; float result2 = (A*B); result2 *= dt; From this page I figured float arithmetic was left-associative and that this means values are evaluated and calculated in a left-to-right manner. The full source code involves XNA's Quaternions. I don't think it's relevant what my constants are and what the VectorHelper.AddPitchRollYaw() does. The test passes just fine if I calculate the delta pitch/roll/yaw angles in the same manner, but as the code is below it does not pass: X Expected: 0.275153548f But was: 0.275153786f [TestFixture] internal class QuaternionPrecisionTest { [Test] public void Test() { JoystickInput input; input.Pitch = 0.312312432f; input.Roll = 0.512312432f; input.Yaw = 0.912312432f; const float dt = 0.017001f; float pitchRate = input.Pitch * PhysicsConstants.MaxPitchRate; float rollRate = input.Roll * PhysicsConstants.MaxRollRate; float yawRate = input.Yaw * PhysicsConstants.MaxYawRate; Quaternion orient1 = Quaternion.Identity; Quaternion orient2 = Quaternion.Identity; for (int i = 0; i < 10000; i++) { float deltaPitch = (input.Pitch * PhysicsConstants.MaxPitchRate) * dt; float deltaRoll = (input.Roll * PhysicsConstants.MaxRollRate) * dt; float deltaYaw = (input.Yaw * PhysicsConstants.MaxYawRate) * dt; // Add deltas of pitch, roll and yaw to the rotation matrix orient1 = VectorHelper.AddPitchRollYaw( orient1, deltaPitch, deltaRoll, deltaYaw); deltaPitch = pitchRate * dt; deltaRoll = rollRate * dt; deltaYaw = yawRate * dt; orient2 = VectorHelper.AddPitchRollYaw( orient2, deltaPitch, deltaRoll, deltaYaw); } Assert.AreEqual(orient1.X, orient2.X, "X"); Assert.AreEqual(orient1.Y, orient2.Y, "Y"); Assert.AreEqual(orient1.Z, orient2.Z, "Z"); Assert.AreEqual(orient1.W, orient2.W, "W"); } } Granted, the error is small and only presents itself after a large number of iterations, but it has caused me some great headackes.

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• Why a graphics overflow problem as a result of a for loop?

  - by sonny5

  using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Imaging; using System.Drawing.Drawing2D; public class Form1 : System.Windows.Forms.Form { public static float WXmin; public static float WYmin; public static float WXmax; public static float WYmax; public static int VXmin; public static int VYmin; public static int VXmax; public static int VYmax; public static float Wx; public static float Wy; public static float Vx; public static float Vy; public Form1() { InitializeComponent(); } private void InitializeComponent() { this.ClientSize = new System.Drawing.Size(400, 300); this.Text="Pass Args"; this.Paint += new System.Windows.Forms.PaintEventHandler(this.doLine); //this.Paint += new System.PaintEventHandler(this.eachCornerPix); //eachCornerPix(out Wx, out Wy, out Vx, out Vy); } static void Main() { Application.Run(new Form1()); } private void doLine(object sender, System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(Brushes.White, this.ClientRectangle); Pen p = new Pen(Color.Black); g.DrawLine(p, 0, 0, 100, 100); // draw DOWN in y, which is positive since no matrix called eachCornerPix(sender, e, out Wx, out Wy, out Vx, out Vy); p.Dispose(); } private void eachCornerPix (object sender, System.EventArgs e, out float Wx, out float Wy, out float Vx, out float Vy) { Wx = 0.0f; Wy = 0.0f; Vx = 0.0f; Vy = 0.0f; Graphics g = this.CreateGraphics(); Pen penBlu = new Pen(Color.Blue, 2); SolidBrush redBrush = new SolidBrush(Color.Red); int width = 2; // 1 pixel wide in x int height = 2; float [] Wxc = {0.100f, 5.900f, 5.900f, 0.100f}; float [] Wyc = {0.100f, 0.100f, 3.900f, 3.900f}; Console.WriteLine("Wxc[0] = {0}", Wxc[0]); Console.WriteLine("Wyc[3] = {0}", Wyc[3]); /* for (int i = 0; i<3; i++) { Wx = Wxc[i]; Wy = Wyc[i]; Vx = ((Wx - WXmin)*((VXmax-VXmin)+VXmin)/(WXmax-WXmin)); Vy = ((Wy - WYmin)*(VYmax-VYmin)/(WYmax-WYmin)+VYmin); Console.WriteLine("eachCornerPix Vx= {0}", Vx); Console.WriteLine("eachCornerPix Vy= {0}", Vy); g.FillRectangle(redBrush, Vx, Vy, width, height); } */ // What is there about this for loop that will not run? // When the comments above and after the for loop are removed, it gets an overflow? g.Dispose(); } }

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• Code golf: the Mandelbrot set

  - by Stefano Borini

  Usual rules for the code golf. Here is an implementation in python as an example from PIL import Image im = Image.new("RGB", (300,300)) for i in xrange(300): print "i = ",i for j in xrange(300): x0 = float( 4.0*float(i-150)/300.0 -1.0) y0 = float( 4.0*float(j-150)/300.0 +0.0) x=0.0 y=0.0 iteration = 0 max_iteration = 1000 while (x*x + y*y <= 4.0 and iteration < max_iteration): xtemp = x*x - y*y + x0 y = 2.0*x*y+y0 x = xtemp iteration += 1 if iteration == max_iteration: value = 255 else: value = iteration*10 % 255 print value im.putpixel( (i,j), (value, value, value)) im.save("image.png", "PNG") The result should look like this Use of an image library is allowed. Alternatively, you can use ASCII art. This code does the same for i in xrange(40): line = [] for j in xrange(80): x0 = float( 4.0*float(i-20)/40.0 -1.0) y0 = float( 4.0*float(j-40)/80.0 +0.0) x=0.0 y=0.0 iteration = 0 max_iteration = 1000 while (x*x + y*y <= 4.0 and iteration < max_iteration): xtemp = x*x - y*y + x0 y = 2.0*x*y+y0 x = xtemp iteration += 1 if iteration == max_iteration: line.append(" ") else: line.append("*") print "".join(line) The result ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** *************************************** ************************************** ************************************* ************************************ ************************************ *********************************** *********************************** ********************************** ************************************ *********************************** ************************************* ************************************ *********************************** ********************************** ******************************** ******************************* **************************** *************************** ***************************** **************************** **************************** *************************** ************************ * * *********************** *********************** * * ********************** ******************** ******* ******* ******************* **************************** *************************** ****************************** ***************************** ***************************** * * * **************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ********************************************************************************

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• Opengl Iphone SDK: How to tell if you're touching an object on screen?

  - by TheGambler

  First is my touchesBegan function and then the struct that stores the values for my object. I have an array of these objects and I'm trying to figure out when I touch the screen if I'm touching an object on the screen. I don't know if I need to do this by iterating through all my objects and figure out if I'm touching an object that way or maybe there is an easier more efficient way. How is this usually handled? -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ [super touchesEnded:touches withEvent:event]; UITouch* touch = ([touches count] == 1 ? [touches anyObject] : nil); CGRect bounds = [self bounds]; CGPoint location = [touch locationInView:self]; location.y = bounds.size.height - location.y; float xTouched = location.x/20 - 8 + ((int)location.x % 20)/20; float yTouched = location.y/20 - 12 + ((int)location.y % 20)/20; } typedef struct object_tag // Create A Structure Called Object { int tex; // Integer Used To Select Our Texture float x; // X Position float y; // Y Position float z; // Z Position float yi; // Y Increase Speed (Fall Speed) float spinz; // Z Axis Spin float spinzi; // Z Axis Spin Speed float flap; // Flapping Triangles :) float fi; // Flap Direction (Increase Value) } object;

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• Grails Twitter Bootstrap Plugin Issue with navbar-fixed-top

  - by Philip Tenn

  I am using Grails 2.1.0 and Twitter Bootstrap Plugin 2.1.1 and am encountering an issue with navbar-fixed-top. In order to get the Navbar fixed to the top of the page to behave correctly during resize, the Twitter Bootstrap Docs states: Add .navbar-fixed-top and remember to account for the hidden area underneath it by adding at least 40px padding to the . Be sure to add this after the core Bootstrap CSS and before the optional responsive CSS. How can I do this when using the Grails Plugin for Twitter Bootstrap? Here is what I have tried: main.gsp <head> ... <r:require modules="bootstrap-css"/> <style type="text/css"> body { padding-top: 60px; padding-bottom: 40px; } .sidebar-nav { padding: 9px 0; } </style> <r:require modules="bootstrap-responsive-css"/> <r:layoutResources/> </head> The problem is that Grails Plugin for Twitter Bootstrap takes the content of bootstrap.css and bootstrap-responsive.css and combines them into the following merged file: static/bundle-bundle_bootstrap_head.css. Thus, I am not able to put the body padding style "after core Bootstrap CSS and before Responsive CSS" as per Twitter Bootstrap docs. Here is the View Source HTML that I get from the main.gsp above <style type="text/css"> body { padding-top: 60px; padding-bottom: 40px; } .sidebar-nav { padding: 9px 0; } </style> <link href="/homes/static/bundle-bundle_bootstrap_head.css" type="text/css" rel="stylesheet" media="screen, projection" /> If there is no way to do this, I could always just drop the Grails Twitter Bootstrap Plugin and manually download Twitter Bootstrap and put it my Grails Project's web-app/css, web-app/images, and web-app/js. However, I would like to be able to use the Grails Twitter Bootstrap Plugin. Thank you very much in advance, I appreciate it!

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• How to get fan list of Facebook page or can overwrite facebook social plugin css?

  - by Vaibhav Bhalke

  Hi, We are trying it with facebook social plugin. The HTML code for it as follow: <iframe border='0' src='http://www.facebook.com/plugins/likebox.php?id=1185611481&width=243&height=400&connections=15&stream=false&header=false' scrolling='yes' frameborder='0' allowTransparency='false' style='border:0px; overflow:hidden; width:243px; height:300px; background-color: #03869E; color: white;'> <iframe> As it replace inner HTML of frame on load. We want our own CSS to apply to this HTML. But as it replace whole HTML and it have its own CSS we are unable to set our CSS. We are doing this in GWT. Is there any way we can get the list of fans so we can display it as we want and can apply css? Or check given user is fan of page?

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• Calculix Data Visualiser using QT

  - by Ann

  I am doing a project on CalculiX data visualizor,using Qt.I 've to draw the structure and after giving force the displacement should be shawn as variation in color.I chose HSV coloring,but while executing I got an error message:"QColor::from Hsv:HSV parameters out of range".The code is: DataViz1::DataViz1(QWidget *parent) : QWidget(parent), ui(new Ui::DataViz1) { DArea = new QGLScreen(this); DArea-setGeometry(QRect(10,10,700,600)); //TODO This values are feeded by user dfile="/home/41407/color.txt";//input file with displacement mfile="/home/41407/mesh21.txt";//input file nodeId="*NODE"; elId="*ELEMENT"; DataId="displ"; parseMfile(); parseDfile(); DArea->Nodes=Nodes; DArea->Elements=Elements; DArea->Data=Data; DArea->fillColorArray(); //printf("Colr is %d",DArea->pickColor(-11.02,0));fflush(stdout); ui->setupUi(this); } DataViz1::~DataViz1() { delete ui; } void DataViz1::parseMfile() { QFile file(mfile); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return; int node_end=0; QTextStream in(&file); in.skipWhiteSpace(); while (!in.atEnd()) { QString line = in.readLine(); if(line.startsWith(nodeId))//Node block in Mfile { while(1) { line = in.readLine(); if(line.startsWith(elId)) { break; } Nodes< while(1) { line = in.readLine(); Elements<<line; //printf("Element is %s\n",line.toLocal8Bit().constData());fflush(stdout); if(in.atEnd()) break; } } } } void DataViz1::parseDfile() { QFile file(dfile); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return; int node_end=0; QTextStream in(&file); in.skipWhiteSpace(); while (!in.atEnd()) { QString line = in.readLine(); if(line.startsWith(DataId)) { continue; } line = in.readLine(); Data< } /......................................................................../ include "qglscreen.h" include GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; QGLScreen::QGLScreen(QWidget *parent):QGLWidget(QGLFormat(QGL::SampleBuffers), parent) { clearColor = Qt::black; xRot = 0; yRot = 0; zRot = 0; ifdef QT_OPENGL_ES_2 program = 0; endif //TODO user input ElType="HE8"; DType="SolidFrame"; axis="X"; } QGLScreen::~QGLScreen() { } QSize QGLScreen::minimumSizeHint() const { return QSize(50, 50); } QSize QGLScreen::sizeHint() const { return QSize(200, 200); } void QGLScreen::setClearColor(const QColor &color) { clearColor = color; updateGL(); } void QGLScreen::initializeGL() { xRot=0; yRot=0; zRot=0; scaling = 1.0; /* select clearing (background) color */ glClearColor (0.0, 0.0, 0.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); // glViewport(0,0,10,10); glOrtho(-10.0, +10.0, -10.0, +10.0, -10.0,+10.0); glEnable (GL_LINE_SMOOTH); glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE); } void QGLScreen::wheel1() { scaling1 += .0025; count2++; update(); } void QGLScreen::wheel2() { if(count2-14) { scaling1 -= .0025; count2--; update(); } } void QGLScreen::drawModel(int x1,int y1,int x2,int y2) { makeCurrent(); QStringList Cnode,Celement; for (int i = 0; i < Elements.size(); ++i) { Celement=Elements.at(i).split(","); // printf("Element is %s",Celement.at(0).toLocal8Bit().constData());fflush(stdout); //printf("Node at el is %s\n",(findNode(Celement.at(1).toInt())).at(1).toLocal8Bit().constData()); fflush(stdout); if(ElType=="HE8") { //First four nodes float ENX1=(findNode(Celement.at(1).toInt())).at(1).toDouble(); float ENX2=(findNode(Celement.at(2).toInt())).at(1).toDouble(); float ENX3=(findNode(Celement.at(3).toInt())).at(1).toDouble(); float ENX4=(findNode(Celement.at(4).toInt())).at(1).toDouble(); float ENY1=(findNode(Celement.at(1).toInt())).at(2).toDouble(); float ENY2=(findNode(Celement.at(2).toInt())).at(2).toDouble(); float ENY3=(findNode(Celement.at(3).toInt())).at(2).toDouble(); float ENY4=(findNode(Celement.at(4).toInt())).at(2).toDouble(); float ENZ1=(findNode(Celement.at(1).toInt())).at(3).toDouble(); float ENZ2=(findNode(Celement.at(2).toInt())).at(3).toDouble(); float ENZ3=(findNode(Celement.at(3).toInt())).at(3).toDouble(); float ENZ4=(findNode(Celement.at(4).toInt())).at(3).toDouble(); //Second four Nodes float ENX5=(findNode(Celement.at(5).toInt())).at(1).toDouble(); float ENX6=(findNode(Celement.at(6).toInt())).at(1).toDouble(); float ENX7=(findNode(Celement.at(7).toInt())).at(1).toDouble(); float ENX8=(findNode(Celement.at(8).toInt())).at(1).toDouble(); float ENY5=(findNode(Celement.at(5).toInt())).at(2).toDouble(); float ENY6=(findNode(Celement.at(6).toInt())).at(2).toDouble(); float ENY7=(findNode(Celement.at(7).toInt())).at(2).toDouble(); float ENY8=(findNode(Celement.at(8).toInt())).at(2).toDouble(); float ENZ5=(findNode(Celement.at(5).toInt())).at(3).toDouble(); float ENZ6=(findNode(Celement.at(6).toInt())).at(3).toDouble(); float ENZ7=(findNode(Celement.at(7).toInt())).at(3).toDouble(); float ENZ8=(findNode(Celement.at(8).toInt())).at(3).toDouble(); //Identify Colors GLfloat ENC[8][3]; for(int k=1;k<8;k++) { int hsv=pickColor(findData(Celement.at(k).toInt()).toDouble(),0); //printf("hsv is %d=",hsv);fflush(stdout); getRGB(hsv); //printf("%d*%d*%d\n",red,green,blue); //ENC[k]={red,green,blue}; ENC[k][0]=red; ENC[k][1]=green; ENC[k][2]=blue; } //Plot the first four direct loop if(DType=="WireFrame"){ glBegin(GL_LINE_LOOP); glColor3f(255,0,0); glVertex3f(ENX1,ENY1,ENZ1); glColor3f(255,0,0); glVertex3f(ENX2,ENY2,ENZ2); glColor3f(255,0,0); glVertex3f(ENX3,ENY3,ENZ3); glColor3f(255,0,0); glVertex3f(ENX4,ENY4,ENZ4); glEnd(); //Plot the second four direct loop glBegin(GL_LINE_LOOP); glColor3f(0,0,255); glVertex3f(ENX5,ENY5,ENZ5); glColor3f(0,0,255); glVertex3f(ENX6,ENY6,ENZ6); glColor3f(0,0,255); glVertex3f(ENX7,ENY7,ENZ7); glColor3f(0,0,255); glVertex3f(ENX8,ENY8,ENZ8); glEnd(); //Plot the interconnections glBegin(GL_LINE); glColor3f(150,150,150); glVertex3f(ENX1,ENY1,ENZ1); glVertex3f(ENX5,ENY5,ENZ5); glEnd(); glBegin(GL_LINE); glColor3f(150,150,150); glVertex3f(ENX2,ENY2,ENZ2); glVertex3f(ENX6,ENY6,ENZ6); glEnd(); glBegin(GL_LINE); glColor3f(150,150,150); glVertex3f(ENX3,ENY3,ENZ3); glVertex3f(ENX7,ENY7,ENZ7); glEnd(); glBegin(GL_LINE); glColor3f(150,150,150); glVertex3f(ENX4,ENY4,ENZ4); glVertex3f(ENX8,ENY8,ENZ8); glEnd(); } if(DType=="SolidFrame") { glBegin(GL_QUADS); glColor3fv(ENC[1]); glVertex3f(ENX1,ENY1,ENZ1); glColor3fv(ENC[2]); glVertex3f(ENX2,ENY2,ENZ2); glColor3fv(ENC[3]); glVertex3f(ENX3,ENY3,ENZ3); glColor3fv(ENC[4]); glVertex3f(ENX4,ENY4,ENZ4); glEnd(); //break; glBegin(GL_QUADS); glColor3fv(ENC[5]); glVertex3f(ENX5,ENY5,ENZ5); glColor3fv(ENC[6]); glVertex3f(ENX6,ENY6,ENZ6); glColor3fv(ENC[7]); glVertex3f(ENX7,ENY7,ENZ7); glColor3fv(ENC[8]); glVertex3f(ENX8,ENY8,ENZ8); glEnd(); glBegin(GL_QUAD_STRIP); glColor3fv(ENC[1]); glVertex3f(ENX1,ENY1,ENZ1); glColor3fv(ENC[5]); glVertex3f(ENX5,ENY5,ENZ5); glColor3fv(ENC[2]); glVertex3f(ENX2,ENY2,ENZ2); glColor3fv(ENC[6]); glVertex3f(ENX6,ENY6,ENZ6); glEnd(); glBegin(GL_QUAD_STRIP); glColor3fv(ENC[3]); glVertex3f(ENX3,ENY3,ENZ3); glColor3fv(ENC[7]); glVertex3f(ENX7,ENY7,ENZ7); glColor3fv(ENC[4]); glVertex3f(ENX4,ENY4,ENZ4); glColor3fv(ENC[8]); glVertex3f(ENX8,ENY8,ENZ8); glEnd(); glBegin(GL_QUAD_STRIP); glColor3fv(ENC[2]); glVertex3f(ENX2,ENY2,ENZ2); glColor3fv(ENC[6]); glVertex3f(ENX6,ENY6,ENZ6); glColor3fv(ENC[3]); glVertex3f(ENX3,ENY3,ENZ3); glColor3fv(ENC[7]); glVertex3f(ENX7,ENY7,ENZ7); glEnd(); glBegin(GL_QUAD_STRIP); glColor3fv(ENC[1]); glVertex3f(ENX1,ENY1,ENZ1); glColor3fv(ENC[5]); glVertex3f(ENX5,ENY5,ENZ5); glColor3fv(ENC[4]); glVertex3f(ENX4,ENY4,ENZ4); glColor3fv(ENC[8]); glVertex3f(ENX8,ENY8,ENZ8); glEnd(); } } } } QStringList QGLScreen::findNode(int element) { QStringList Temp; for (int i = 0; i < Nodes.size(); ++i) { Temp=Nodes.at(i).split(","); if(Temp.at(0).toInt()==element) { break; } } return Temp; } QString QGLScreen::findData(int Node) { QString Temp; QRegExp sep("\s+"); for (int i = 0; i < Data.size(); ++i) { if((Data.at(i).split("\t")).at(0).section(sep,1,1).toInt()==Node) { if(axis=="X") { Temp=Data.at(i).split("\t").at(0).section(sep,2,2); } if(axis=="Y") { Temp=Data.at(i).split("\t").at(0).section(sep,3,3); } if(axis=="Z") { Temp=Data.at(i).split("\t").at(0).section(sep,4,4); } break; } } return Temp; } void QGLScreen::fillColorArray() { QString Temp1,Temp2,Temp3; double d1s=0,d2s=0,d3s=0,d1l=0,d2l=0,d3l=0,diff=0; QRegExp sep("\\s+"); for (int i = 0; i < Data.size(); ++i) { Temp1=(Data.at(i).split("\t")).at(0).section(sep,2,2); if(d1s>Temp1.toDouble()) { d1s=Temp1.toDouble(); } if(d1l<Temp1.toDouble()) { d1l=Temp1.toDouble(); } Temp2=(Data.at(i).split("\t")).at(0).section(sep,3,3); if(d2s>Temp2.toDouble()) { d2s=Temp2.toDouble(); } if(d2l<Temp2.toDouble()) { d2l=Temp2.toDouble(); } Temp3=(Data.at(i).split("\t")).at(0).section(sep,4,4); if(d3s>Temp3.toDouble()) { d3s=Temp3.toDouble(); } if(d3l<Temp3.toDouble()) { d3l=Temp3.toDouble(); } // printf("data is %s",Temp.toLocal8Bit().constData());fflush(stdout); } color[0][0]=d1l; for(int i=1;i<360;i++) { //printf("Large is%f small is %f",d1l,d1s); diff=d1l-d1s; if(d1l==0&&d1s<0) color[0][i]=color[0][i-1]-diff/360; else if(d1l>0&&d1s==0) color[0][i]=color[0][i-1]+diff/360; else if(d1l>0&&d1s<0) color[0][i]=color[0][i-1]-diff/360; diff=d2l-d2s; if(d2l==0&&d2s<0) color[1][i]=color[1][i-1]-diff/360; else if(d2l>0&&d2s==0) color[1][i]=color[1][i-1]+diff/360; else if(d2l>0&&d2s<0) color[1][i]=color[1][i-1]-diff/360; diff=d3l-d3s; if(d3l==0&&d3s<0) color[2][i]=color[2][i-1]-diff/360; else if(d3l>0&&d3s==0) color[2][i]=color[2][i-1]+diff/360; else if(d3l>0&&d3s<0) color[2][i]=color[2][i-1]-diff/360; } //for(int i=0;i<360;i++) printf("%d %f %f %f\n",i,color[0][i],color[1][i],color[2][i]); } int QGLScreen::pickColor(double data,int Did) { int i,pos; if(axis=="X")Did=0; if(axis=="Y")Did=1; if(axis=="Z")Did=2; //printf("%f data is",data);fflush(stdout); for(int i=0;i<360;i++) { if(color[Did][i]<data && data>color[Did][i+1]) { //printf("Orginal dat is %f Data found is %f and pos %d\n",data,color[Did][i],i);fflush(stdout); pos=i; break; } } return pos; } void QGLScreen::getRGB(int hsv) { QColor c; c.setHsv(hsv,255,255,255); QColor r=QColor::fromHsv(hsv,255,255); red=r.red(); green=r.green(); blue=r.blue(); } void QGLScreen::paintGL() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushAttrib(GL_ALL_ATTRIB_BITS); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); GLfloat x = 3.0 * GLfloat(width()) / height(); glOrtho(-x, +x, -3.0, +3.0, 4.0, 15.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTranslatef(0.0, 0.0, -10.0); glScalef(scaling, scaling, scaling); glRotatef(xRot, 1.0, 0.0, 0.0); glRotatef(yRot, 0.0, 1.0, 0.0); glRotatef(zRot, 0.0, 0.0, 1.0); drawModel(0,0,1,1); /* don't wait! * start processing buffered OpenGL routines */ glFlush (); } /void QGLScreen::zoom1() { scaling+=.05; update(); }/ void QGLScreen::resizeGL(int width, int height) { int side = qMin(width, height); glViewport((width - side) / 2, (height - side) / 2, side, side); #if !defined(QT_OPENGL_ES_2) glMatrixMode(GL_PROJECTION); glLoadIdentity(); #ifndef QT_OPENGL_ES glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0); #else glOrthof(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0); #endif glMatrixMode(GL_MODELVIEW); #endif } void QGLScreen::mousePressEvent(QMouseEvent *event) { lastPos = event-pos(); } void QGLScreen::mouseMoveEvent(QMouseEvent *event) { GLfloat dx = GLfloat(event->x() - lastPos.x()) / width(); GLfloat dy = GLfloat(event->y() - lastPos.y()) / height(); if (event->buttons() & Qt::LeftButton) { xRot+= 180 * dy; yRot += 180 * dx; update(); } else if (event->buttons() & Qt::RightButton) { xRot += 180 * dy; yRot += 180 * dx; update(); } lastPos = event->pos(); } void QGLScreen::mouseReleaseEvent(QMouseEvent * /* event */) { emit clicked(); }

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• Calculate new position of player

  - by user1439111

  Edit: I will summerize my question since it is very long (Thanks Len for pointing it out) What I'm trying to find out is to get a new position of a player after an X amount of time. The following variables are known: - Speed - Length between the 2 points - Source position (X, Y) - Destination position (X, Y) How can I calculate a position between the source and destion with these variables given? For example: source: 0, 0 destination: 10, 0 speed: 1 so after 1 second the players position would be 1, 0 The code below works but it's quite long so I'm looking for something shorter/more logical ====================================================================== I'm having a hard time figuring out how to calculate a new position of a player ingame. This code is server sided used to track a player(It's a emulator so I don't have access to the clients code). The collision detection of the server works fine I'm using bresenham's line algorithm and a raycast to determine at which point a collision happens. Once I deteremined the collision I calculate the length of the path the player is about to walk and also the total time. I would like to know the new position of a player each second. This is the code I'm currently using. It's in C++ but I am porting the server to C# and I haven't written the code in C# yet. // Difference between the source X - destination X //and source y - destionation Y float xDiff, yDiff; xDiff = xDes - xSrc; yDiff = yDes - ySrc; float walkingLength = 0.00F; float NewX = xDiff * xDiff; float NewY = yDiff * yDiff; walkingLength = NewX + NewY; walkingLength = sqrt(walkingLength); const float PI = 3.14159265F; float Angle = 0.00F; if(xDes >= xSrc && yDes >= ySrc) { Angle = atanf((yDiff / xDiff)); Angle = Angle * 180 / PI; } else if(xDes < xSrc && yDes >= ySrc) { Angle = atanf((-xDiff / yDiff)); Angle = Angle * 180 / PI; Angle += 90.00F; } else if(xDes < xSrc && yDes < ySrc) { Angle = atanf((yDiff / xDiff)); Angle = Angle * 180 / PI; Angle += 180.00F; } else if(xDes >= xSrc && yDes < ySrc) { Angle = atanf((xDiff / -yDiff)); Angle = Angle * 180 / PI; Angle += 270.00F; } float WalkingTime = (float)walkingLength / (float)speed; bool Done = false; float i = 0; while(i < walkingLength) { if(Done == true) { break; } if(WalkingTime >= 1000) { Sleep(1000); i += speed; WalkTime -= 1000; } else { Sleep(WalkTime); i += speed * WalkTime; WalkTime -= 1000; Done = true; } if(Angle >= 0 && Angle < 90) { float xNew = cosf(Angle * PI / 180) * i; float yNew = sinf(Angle * PI / 180) * i; float NewCharacterX = xSrc + xNew; float NewCharacterY = ySrc + yNew; } I have cut the last part of the loop since it's just 3 other else if statements with 3 other angle conditions and the only change is the sin and cos. The given speed parameter is the speed/second. The code above works but as you can see it's quite long so I'm looking for a new way to calculate this. btw, don't mind the while loop to calculate each new position I'm going to use a timer in C# Thank you very much

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• java quaternion 3D rotation implementation

  - by MRM

  I made a method to rotate a list of points using quaternions, but all i get back as output is the same list i gave to rotate on. Maybe i did not understood corectly the math for 3d rotations or my code is not implemented the right way, could you give me a hand? This is the method i use: public static ArrayList<Float> rotation3D(ArrayList<Float> points, double angle, int x, int y, int z) { ArrayList<Float> newpoints = points; for (int i=0;i<points.size();i+=3) { float x_old = points.get(i).floatValue(); float y_old = points.get(i+1).floatValue(); float z_old = points.get(i+2).floatValue(); double[] initial = {1,0,0,0}; double[] total = new double[4]; double[] local = new double[4]; //components for local quaternion //w local[0] = Math.cos(0.5 * angle); //x local[1] = x * Math.sin(0.5 * angle); //y local[2] = y * Math.sin(0.5 * angle); //z local[3] = z * Math.sin(0.5 * angle); //components for final quaternion Q1*Q2 //w = w1w2 - x1x2 - y1y2 - z1z2 total[0] = local[0] * initial[0] - local[1] * initial[1] - local[2] * initial[2] - local[3] * initial[3]; //x = w1x2 + x1w2 + y1z2 - z1y2 total[1] = local[0] * initial[1] + local[1] * initial[0] + local[2] * initial[3] - local[3] * initial[2]; //y = w1y2 - x1z2 + y1w2 + z1x2 total[2] = local[0] * initial[2] - local[1] * initial[3] + local[2] * initial[0] + local[3] * initial[1]; //z = w1z2 + x1y2 - y1x2 + z1w2 total[3] = local[0] * initial[3] + local[1] * initial[2] - local[2] * initial[1] + local[3] * initial[0]; //new x,y,z of the 3d point using rotation matrix made from the final quaternion float x_new = (float)((1 - 2 * total[2] * total[2] - 2 * total[3] * total[3]) * x_old + (2 * total[1] * total[2] - 2 * total[0] * total[3]) * y_old + (2 * total[1] * total[3] + 2 * total[0] * total[2]) * z_old); float y_new = (float) ((2 * total[1] * total[2] + 2 * total[0] * total[3]) * x_old + (1 - 2 * total[1] * total[1] - 2 * total[3] * total[3]) * y_old + (2 * total[2] * total[3] + 2 * total[0] * total[1]) * z_old); float z_new = (float) ((2 * total[1] * total[3] - 2 * total[0] * total[2]) * x_old + (2 * total[2] * total[3] - 2 * total[0] * total[1]) * y_old + (1 - 2 * total[1] * total[1] - 2 * total[2] * total[2]) * z_old); newpoints.set(i, x_new); newpoints.set(i+1, y_new); newpoints.set(i+2, z_new); } return newpoints; } For rotation3D(points, 50, 0, 1, 0) where points is: 0.0, 0.0, -9.0; 0.0, 0.0, -11.0; 20.0, 0.0, -11.0; 20.0, 0.0, -9.0; i get back the same list.

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• Limit JavaScript and CSS files on ASP.NET MVC 2 Master Page based on Model and View content

  - by Zack Peterson

  I want to include certain .js and .css files only on pages that need them. For example, my EditorTemplate DateTime.ascx needs files anytimec.js and anytimec.css. That template is applied whenever I use either the EditorFor or EditorForModel helper methods in a view for a model with a DateTime type value. I've put this condition into the <head> section of my master page. It checks for a DateTime type property in the ModelMetadata. <% if (this.ViewData.ModelMetadata.Properties.Any(p => p.ModelType == typeof(DateTime))) { %> <link href="../../Content/anytimec.css" rel="stylesheet" type="text/css" /> <script src="../../Scripts/anytimec.js" type="text/javascript"></script> <% } %> This has two problems: Fails if I have nested child models of type DateTime Unnecessarily triggered by views without EditorFor or EditorForModel methods (example: DisplayForModel) How can I improve this technique?

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• Adding a reference to a css file in an ascx file in vs2008 only to get intellisense

  - by Nick Allen - Tungle139

  Normally visual studio brings up intellisense for available css classes, which it draws from css files linked to the current aspx/master document. Is there a way to get this to work in an ascx file in a similar way to referencing external JavaScript files in js files for the purpose of intellisense /// <reference path="jquery-1.4.1.js" /> I only want this for the purpose of intellisense and not getting squiggly lines under un-recognised classes. My css files will be actually linked from the aspx/master page.

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• C# generics when T could be an array

  - by bufferz

  I am writing a C# wrapper for a 3rd party library that reads both single values and arrays from a hardware device, but always returns an object[] array even for one value. This requires repeated calls to object[0] when I'd like the end user to be able to use generics to receive either an array or single value. I want to use generics so the callee can use the wrapper in the following ways: MyWrapper<float> mw = new MyWrapper<float>( ... ); float value = mw.Value; //should return float; MyWrapper<float[]> mw = new MyWrapper<float[]>( ... ); float[] values = mw.Value; //should return float[]; In MyWrapper I have the Value property currently as the following: public T Value { get { if(_wrappedObject.Values.Length > 1) return (T)_wrappedObject.Value; //T could be float[]. this doesn't compile. else return (T)_wrappedObject.Values[0]; //T could be float. this compiles. } } I get a compile error in the first case: Cannot convert type 'object[]' to 'T' If I change MyWrapper.Value to T[] I receive: Cannot convert type 'object[]' to 'T[]' Any ideas of how to achieve my goal? Thanks!

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• Filling in gaps for outlines

  - by user146780

  I'm using an algorithm to generate quads. These become outlines. The algorithm is: void OGLENGINEFUNCTIONS::GenerateLinePoly(const std::vector<std::vector<GLdouble>> &input, std::vector<GLfloat> &output, int width) { output.clear(); if(input.size() < 2) { return; } int temp; float dirlen; float perplen; POINTFLOAT start; POINTFLOAT end; POINTFLOAT dir; POINTFLOAT ndir; POINTFLOAT perp; POINTFLOAT nperp; POINTFLOAT perpoffset; POINTFLOAT diroffset; POINTFLOAT p0, p1, p2, p3; for(unsigned int i = 0; i < input.size() - 1; ++i) { start.x = static_cast<float>(input[i][0]); start.y = static_cast<float>(input[i][1]); end.x = static_cast<float>(input[i + 1][0]); end.y = static_cast<float>(input[i + 1][1]); dir.x = end.x - start.x; dir.y = end.y - start.y; dirlen = sqrt((dir.x * dir.x) + (dir.y * dir.y)); ndir.x = static_cast<float>(dir.x * 1.0 / dirlen); ndir.y = static_cast<float>(dir.y * 1.0 / dirlen); perp.x = dir.y; perp.y = -dir.x; perplen = sqrt((perp.x * perp.x) + (perp.y * perp.y)); nperp.x = static_cast<float>(perp.x * 1.0 / perplen); nperp.y = static_cast<float>(perp.y * 1.0 / perplen); perpoffset.x = static_cast<float>(nperp.x * width * 0.5); perpoffset.y = static_cast<float>(nperp.y * width * 0.5); diroffset.x = static_cast<float>(ndir.x * 0 * 0.5); diroffset.y = static_cast<float>(ndir.y * 0 * 0.5); // p0 = start + perpoffset - diroffset //p1 = start - perpoffset - diroffset //p2 = end + perpoffset + diroffset // p3 = end - perpoffset + diroffset p0.x = start.x + perpoffset.x - diroffset.x; p0.y = start.y + perpoffset.y - diroffset.y; p1.x = start.x - perpoffset.x - diroffset.x; p1.y = start.y - perpoffset.y - diroffset.y; p2.x = end.x + perpoffset.x + diroffset.x; p2.y = end.y + perpoffset.y + diroffset.y; p3.x = end.x - perpoffset.x + diroffset.x; p3.y = end.y - perpoffset.y + diroffset.y; output.push_back(p2.x); output.push_back(p2.y); output.push_back(p0.x); output.push_back(p0.y); output.push_back(p1.x); output.push_back(p1.y); output.push_back(p3.x); output.push_back(p3.y); } } The problem is that there are then gaps as seen here: http://img816.imageshack.us/img816/2882/eeekkk.png There must be a way to fix this. I see a pattern but I just cant figure it out. There must be a way to fill the missing inbetweens. Thanks

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• Care to be taken when serving static content (JS, CSS, Media) from different domain?

  - by Aahan Krish

  Let me try to explain by example. Say website is hosted at example.com (NOT www.example.com). In order to serve static content cookie-free, I've chosen to use a different domain example-static.com. Now, lets consider that my static content is currently served like this: http://example.com/js/script.js http://example.com/css/style.css http://example.com/media/image.jpg ** Now I create a CNAME record aliasing example-static.com to my main domain i.e. example.com so that the static content is served as such: http://example-static.com/js/script.js http://example-static.com/css/style.css http://example-static.com/media/image.jpg ** Is that all I have to do? Will all browsers execute JavaScript files and load web fonts without any security concerns? OR should I be using some .htaccess rules to modify header information and the like? PS: It would be great if you can provide what rules should be added, if need be.

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• Calling Base Class Functions with Inherited Type

  - by Kein Mitleid

  I can't describe exactly what I want to say but I want to use base class functions with an inherited type. Like I want to declare "Coord3D operator + (Coord3D);" in one class, but if I use it with Vector3D operands, I want it to return Vector3D type instead of Coord3D. With this line of code below, I add two Vector3D's and get a Coord3D in return, as told to me by the typeid().name() function. How do I reorganize my classes so that I get a Vector3D on return? #include <iostream> #include <typeinfo> using namespace std; class Coord3D { public: float x, y, z; Coord3D (float = 0.0f, float = 0.0f, float = 0.0f); Coord3D operator + (Coord3D &); }; Coord3D::Coord3D (float a, float b, float c) { x = a; y = b; z = c; } Coord3D Coord3D::operator+ (Coord3D &param) { Coord3D temp; temp.x = x + param.x; temp.y = y + param.y; temp.z = z + param.z; return temp; } class Vector3D: public Coord3D { public: Vector3D (float a = 0.0f, float b = 0.0f, float c = 0.0f) : Coord3D (a, b, c) {}; }; int main () { Vector3D a (3, 4, 5); Vector3D b (6, 7, 8); cout << typeid(a + b).name(); return 0; }

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• Enumeration trouble: redeclared as different kind of symbol

  - by Matt

  Hello all. I am writing a program that is supposed to help me learn about enumeration data types in C++. The current trouble is that the compiler doesn't like my enum usage when trying to use the new data type as I would other data types. I am getting the error "redeclared as different kind of symbol" when compiling my trangleShape function. Take a look at the relevant code. Any insight is appreciated! Thanks! (All functions are their own .cpp files.) header file #ifndef HEADER_H_INCLUDED #define HEADER_H_INCLUDED #include <iostream> #include <iomanip> using namespace std; enum triangleType {noTriangle, scalene, isoceles, equilateral}; //prototypes void extern input(float&, float&, float&); triangleType extern triangleShape(float, float, float); /*void extern output (float, float, float);*/ void extern myLabel(const char *, const char *); #endif // HEADER_H_INCLUDED main function //8.1 main // this progam... #include "header.h" int main() { float sideLength1, sideLength2, sideLength3; char response; do //main loop { input (sideLength1, sideLength2, sideLength3); triangleShape (sideLength1, sideLength2, sideLength3); //output (sideLength1, sideLength2, sideLength3); cout << "\nAny more triangles to analyze? (y,n) "; cin >> response; } while (response == 'Y' || response == 'y'); myLabel ("8.1", "2/11/2011"); return 0; } triangleShape shape # include "header.h" triangleType triangleShape(sideLenght1, sideLength2, sideLength3) { triangleType triangle; return triangle; }

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