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• Game server for an android/iOS turn-based board-game

  - by Cyril

  I am currently programming an iPhone game and I would like to create an online multiplayer mode. In the future, this app will be port to Android devices, so I was wondering how to create the game-server? First at all, which language should I choose? How to make a server able to communicate both with programs written in objective-c and Java? Then, how to effectively do it? Is it good if I open a socket by client (there'll be 2)? What kind of information should I send to the server? to the clients?

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• Rotate sprite to face 3D camera

  - by omikun

  I am trying to rotate a sprite so it is always facing a 3D camera. shaders->setUniform("camera", gCamera.matrix()); glm::mat4 scale = glm::scale(glm::mat4(), glm::vec3(5e5, 5e5, 5e5)); glm::vec3 look = gCamera.position(); glm::vec3 right = glm::cross(gCamera.up(), look); glm::vec3 up = glm::cross(look, right); glm::mat4 newTransform = glm::lookAt(glm::vec3(0), gCamera.position(), up) * scale; shaders->setUniform("model", newTransform); In the vertex shader: gl_Position = camera * model * vec4(vert, 1); The object will track the camera if I move the camera up or down, but if I rotate the camera around it, it will rotate in the other direction so I end up seeing its front twice and its back twice as I rotate around it 360. What am I doing wrong?

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• How do I detect multiple sprite collisions when there are >10 sprites?

  - by yao jiang

  I making a small program to animate the astar algorithm. If you look at the image, there are lots of yellow cars moving around. Those can collide at any moment, could be just one or all of them could just stupidly crash into each other. How do I detect all of those collisions? How do I find out which specific car has crash into which other car? I understand that pygame has collision function, but it only detects one collision at a time and I'd have to specify which sprites. Right now I am just trying to iterate through each sprite to see if there is collision: for car1 in carlist: for car2 in carlist: collide(car1, car2); This can't be the proper way to do it, if the car list goes to a huge number, a double loop will be too slow.

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• Phone crash when try to use vibration on Android

  - by Diego Unanue

  Im developing an app that when you click a button the phone has to vibrate, the issue is that the phone just chashes. Saing that I need permitions to vibrate. I've already set this permition in the build.setting (android manifiest). Here is the code build.settings: settings = { orientation = { default = "portrait", supported = { "portrait", } }, iphone = { plist= { CoronaUseIOS7LandscapeOnlyWorkaround = true, CoronaUseIOS7IPadPhotoPickerLandscapeOnlyWorkaround = true, CoronaUseIOS6LandscapeOnlyWorkaround = true, CoronaUseIOS6IPadPhotoPickerLandscapeOnlyWorkaround = true, UIApplicationExitsOnSuspend = false, UIPrerenderedIcon = true, UIStatusBarHidden = false, CFBundleIconFile = "Icon.png", CFBundleIconFiles = { "Icon.png", "[email protected]", "Icon-60.png", "[email protected]", "Icon-72.png", "[email protected]", "Icon-76.png", "[email protected]", "Icon-Small.png", "[email protected]", "Icon-Small-40.png", "[email protected]", "Icon-Small-50.png", "[email protected]", }, }, }, android = { permissions = { { name = ".permission.C2D_MESSAGE", protectionLevel = "signature" }, }, usesPermissions = { "android.permission.INTERNET", "android.permission.VIBRATE", }, }, } the file that uses the vibration is: local onButtonEvent = function (event ) system.vibrate() end I read all post in Corona page without success. Can I see the android manifest to see if the permissions are there. I've read that is a Corona issue not sure.

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• How are bullets simulated in video games?

  - by mahen23

  I have been playing games like MW2 recently and, as a programmer, I tend to ask myself how do they make the game so immersive. For example, how to they simulate bullet speed. When an NPC fires a bullet from his gun, does the bullet really travel from his gun to the given target or do they they completely ignore this part and just put a bullet hole on the target? If the bullet is really travelling from the gun to the target, at what speed is it actually travelling?

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• Packing jar files into library jar files

  - by Hillel

  Firstly, this question is not about packing a simple jar file (e.g. lwjgl) into a runnable jar file. I know how to do this using JarSplice. So if I have a game which uses JInput, I will pack my game jar and jinput.jar using JarSplice and enter the natives in the process. The problem arises when I want to create a custom library that uses JInput, and then pack that into my games. See, the whole idea of writing a game library is that I don't ever have to even copy code like the wrapper I wrote for JInput Controller, and I always have a definitive version inside a library jar. Basically what I wanna do is create a jar file of my library, pack jinput.jar into it using JarSplice, possibly with the natives as well, and then when I want to export a jar of my game, I either export it automatically through Eclipse with the library jar, or, if that doesn't work, use JarSplice. I've tried several solutions, and nothing works. When I try to pack the game jar and the library jar using JarSplice, I get an error saying that there's either duplicate .project or .classpath. When I try to export my game through Eclipse with the library jar, it won't run (which is to be expected), but then, if I try to attach the natives with JarSplice, it doesn't give me any errors but the jar doesn't run. I'm not expecting anyone to solve this, but if anyone has an idea, something that will allow me to never look at the Gamepad code ever again, that would be awesome. I don't care if I have to package my library jar using JarSplice 5 times, and then do the same with the game jar, as long as it works. Otherwise I'll just have to copy the Gamepad class into every project alongside the library jar. :(

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• Traffic estimation for a multiplayer flash game

  - by Steve Addington

  hey, i want to know if my rough traffic estimations are right, it would be for a pretty simple realtime flashgame in the style of haxball (but not as a soccer game) heres a video of it http://www.youtube.com/watch?v=z_xBdFg1RcI So here comes my estimation, i dont know if they are realistic! i hope someone can help me. consider the packet attached as a typical one sent every 200ms, its 148bytes + 64 bytes of header will make around a 200bytes packet. The server will receive 200bytes x 6 players x 5 times a sec=6000bytes/s=5.85Kbytes/s=46.9kbit/s plus he has to send all back to the players, so at this point are 94Kbit/s.The server received all the information, perform the definitive calculation and send the new position to all players, in a bigger packet of around 900bytes that have to be delivered to the others 6, which makes 900bytes x 6 players x 5 times a sec=27000bytes/s=26Kbytes/s=210kbit/s. overall that would be 26kbyte per second. thats like 130mb traffic per hour for a 6player room. but somehow i think the numbers are too high? that would be really much traffic for such a simple game. did i calculate something wrong?

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• Car engine sound simulation

  - by Petteri Hietavirta

  I have been thinking how to create realistic sound for a car. The main sound is the engine, then all kind of wind, road and suspension sounds. Are there any open source projects for the engine sound simulation? Simply pitching up the sample does not sound too great. The ideal would be to something that allows me to pick type of the engine (i.e. inline-4 vs v-8), add extras like turbo/supercharger whine and finally set the load and rpm. Edit: Something like http://www.sonory.org/examples.html

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• Unity: Spin wheels to move vehicle

  - by Paul Manta

  I am just getting started with Unity and I'd like to ask a question. If I have a "Vehicle" object that has two children: "FrontWheel" and "BackWheel" (both 'wheels' are cylinders), how should I set everything up such that I can move the entire vehicle by turning its wheels? When I apply a torque to "FrontWheel", the vehicle starts to move, but instead of the whole thing the moving together, the chassis is rolling on the cylinders and eventually falls off. How can I prevent it from doing that?

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• Loading a new instance of a class through XML not working quite right

  - by Thegluestickman

  I'm having trouble with XML and XNA. I want to be able to load weapon settings through XML to make my weapons easier to make and to have less code in the actual project file. So I started out making a basic XML document, something to just assign variables with. But no matter what I changed it gave me a new error every time. The code below gives me a "XML element 'Tag' not found", I added and it started to say the variables weren't found. What I wanted to do in the XML file as well, was load a texture for the file too. So I created a static class to hold my texture values, then in the Texture tag of my XML document I would set it to that instance too. I think that's were the problems are occuring because that's where the "XML element 'Tag' not found" error is pointing me too. My XML document: <XnaContent> <Asset Type="ConversationEngine.Weapon"> <weaponStrength>0</weaponStrength> <damageModifiers>0</damageModifiers> <speed>0</speed> <magicDefense>0</magicDefense> <description>0</description> <identifier>0</identifier> <weaponTexture>LoadWeaponTextures.ironSword</weaponTexture> </Asset> </XnaContent> My Class to load the weapon XML: public static class LoadWeaponXML { static Weapon Weapons; public static Weapon WeaponLoad(ContentManager content, int id) { Weapons = content.Load<Weapon>(@"Weapons/" + id); return Weapons; } } public static class LoadWeaponTextures { public static Texture2D ironSword; public static void TextureLoad(ContentManager content) { ironSword = content.Load<Texture2D>("Sword"); } } I'm not entirely sure if you can load textures through XML, but any help would be greatly appreciated.

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• Rotate view matrix based on touch coordinates

  - by user1055947

  I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing origin. I have succeeded in moving the camera through rotation left or right, up or down based on the user dragging the finger, but my problem is obviously that after I drag my finger up/down and rotate say 90 degrees so my intial position of -z is now +y and still facing origin, if I drag my finger left/right I want to rotate from +y to +x, but what happens is it rotates around the pole +y. This is to be expected as I am mapping 2D touch drag coords to 3D space, but I dont know where to start trying to do what I want. Perhaps someone can point me in the right direction, I've been googling for a while now but I don't know what I want to do is called! Edit __ What I was looking for is called an ArcBall, google it for lots of info on it.

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• Cocos2D 2.0 - masking a sprite

  - by Desperate Developer

  I have read this tutorial about how to mask sprites using Cocos2D 2.0. http://www.raywenderlich.com/4428/how-to-mask-a-sprite-with-cocos2d-2-0 But the author talks about OpenGL ES textures and vertices as they were common knowledge. My knowledge about OpenGl is zero raised to infinity. All I want is to use a rectangle to mask a sprite to it. How I would do in Photoshop using a rectangle as mask (yes, I want to clip a sprite to the rectangle bounds and no, I do not want to use the ClippingNode solution, that do not works for animation/scaling etc.). So, can you guys translate the klingon language used in this tutorial and tell how a solid rectangle can be used to mask a sprite in Cocos2D? I am desperate, as my username states. I am searching this for a week and have tried several solutions without satisfactory results. Please help me. Thanks!

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• Need to combine a color, mask, and sprite layer in a shader

  - by Donutz

  My task: to display a sprite using different team colors. I have a sprte graphic, part of which has to be displayed as a team color. The color isn't 'flat', i.e. it shades from brighter to darker. I can't "pre-build" the graphics because there are just too many, so I have to generate them at runtime. I've decided to use a shader, and supply it with a texture consisting of the team color, a texture consisting of a mask (black=no color, white=full color, gray=progressively dimmed color), and the sprite grapic, with the areas where the team color shows being transparent. So here's my shader code: // Effect attempts to merge a color layer, a mask layer, and a sprite layer // to produce a complete sprite sampler UnitSampler : register(s0); // the unit sampler MaskSampler : register(s1); // the mask sampler ColorSampler : register(s2); // the color float4 main(float4 color : COLOR0, float2 texCoord : TEXCOORD0) : COLOR0 { float4 tex1 = tex2D(ColorSampler, texCoord); // get the color float4 tex2 = tex2D(MaskSampler, texCoord); // get the mask float4 tex3 = tex2D(UnitSampler,texCoord); // get the unit float4 tex4 = tex1 * tex2.r * tex3; // color * mask * unit return tex4; } My problem is the calculations involving tex1 through tex4. I don't really understand how the manipulations work, so I'm just thrashing around, producing lots of different incorrect effects. So given tex1 through tex3, what calcs do I do in order to take the color (tex1), mask it (tex2), and apply the result to the unit if it's not zero? And would I be better off to make the mask just on/off (white/black) and put the color shading in the unit graphic?

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• Creating blur with an alpha channel, incorrect inclusion of black

  - by edA-qa mort-ora-y

  I'm trying to do a blur on a texture with an alpha channel. Using a typical approach (two-pass, gaussian weighting) I end up with a very dark blur. The reason is because the blurring does not properly account for the alpha channel. It happily blurs in the invisible part of the image, whcih happens to be black, and thus results in a very dark blur. Is there a technique to blur that properly accounts for the alpha channel?

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• Xna Loading Screens

  - by Cyral

  I'm making a 2D XNA game. I'd like to implement loading screens when stuff has to load for a while. Like when I login to an account, connect to the server, and generate worlds. I'm pretty sure it needs to be multithreaded, because I want to be able to do something like "Generating World 10%...11%...". GenerateWorld() { //Call StartLoading("Generating World"); or something //Starter generating, Updating progress... //End loading screen and fade into world } Help appreciated, I'm new.

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• Logic behind a bejeweled-like game

  - by Joe

  In a prototype I am doing, there is a minigame similar to bejeweled. Using a grid that is a 2d array (int[,]) how can I go about know when the user formed a match? I only care about horizontally and vertically. Off the top of my head I was thinking I would just look each direction. Something like: int item = grid[x,y]; if(grid[x-1,y]==item) { int step=x; int matches =2; while(grid[step-1,y]==item) { step++; matches++ } if(matches>2) //remove all matching items } else if(grid[x+1,y]==item //.... else if(grid[x,y-1==item) //... else if(grid[x,y+1]==item) //... It seems like there should be a better way. Is there?

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• How can I move a polygon edge 1 unit away from the center?

  - by Stephen

  Let's say I have a polygon class that is represented by a list of vector classes as vertices, like so: var Vector = function(x, y) { this.x = x; this.y = y; }, Polygon = function(vectors) { this.vertices = vectors; }; Now I make a polygon (in this case, a square) like so: var poly = new Polygon([ new Vector(2, 2), new Vector(5, 2), new Vector(5, 5), new Vector(2, 5) ]); So, the top edge would be [poly.vertices[0], poly.vertices[1]]. I need to stretch this polygon by moving each edge away from the center of the polygon by one unit, along that edge's normal. The following example shows the first edge, the top, moved one unit up: The final polygon should look like this new one: var finalPoly = new Polygon([ new Vector(1, 1), new Vector(6, 1), new Vector(6, 6), new Vector(1, 6) ]); It is important that I iterate, moving one edge at a time, because I will be doing some collision tests after moving each edge. Here is what I tried so far (simplified for clarity), which fails triumphantly: for(var i = 0; i < vertices.length; i++) { var a = vertices[i], b = vertices[i + 1] || vertices[0]; // in case of final vertex var ax = a.x, ay = a.y, bx = b.x, by = b.y; // get some new perpendicular vectors var a2 = new Vector(-ay, ax), b2 = new Vector(-by, bx); // make into unit vectors a2.convertToUnitVector(); b2.convertToUnitVector(); // add the new vectors to the original ones a.add(a2); b.add(b2); // the rest of the code, collision tests, etc. } This makes my polygon start slowly rotating and sliding to the left, instead of what I need. Finally, the example shows a square, but the polygons in question could be anything. They will always be convex, and always with vertices in clockwise order.

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• 2D graphics - why use spritesheets?

  - by Columbo

  I have seen many examples of how to render sprites from a spritesheet but I havent grasped why it is the most common way of dealing with sprites in 2d games. I have started out with 2d sprite rendering in the few demo applications I've made by dealing with each animation frame for any given sprite type as its own texture - and this collection of textures is stored in a dictionary. This seems to work for me, and suits my workflow pretty well, as I tend to make my animations as gif/mng files and then extract the frames to individual pngs. Is there a noticeable performance advantage to rendering from a single sheet rather than from individual textures? With modern hardware that is capable of drawing millions of polygons to the screen a hundred times a second, does it even matter for my 2d games which just deal with a few dozen 50x100px rectangles? The implementation details of loading a texture into graphics memory and displaying it in XNA seems pretty abstracted. All I know is that textures are bound to the graphics device when they are loaded, then during the game loop, the textures get rendered in batches. So it's not clear to me whether my choice affects performance. I suspect that there are some very good reasons most 2d game developers seem to be using them, I just don't understand why.

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• Understanding normal maps on terrain

  - by JohnB

  I'm having trouble understanding some of the math behind normal map textures even though I've got it to work using borrowed code, I want to understand it. I have a terrain based on a heightmap. I'm generating a mesh of triangles at load time and rendering that mesh. Now for each vertex I need to calculate a normal, a tangent, and a bitangent. My understanding is as follows, have I got this right? normal is a unit vector facing outwards from the surface of the triangle. For a vertex I take the average of the normals of the triangles using that vertex. tangent is a unit vector in the direction of the 'u' coordinates of the texture map. As my texture u,v coordinates follow the x and y coordinates of the terrain, then my understanding is that this vector is simply the vector along the surface in the x direction. So should be able to calculate this as simply the difference between vertices in the x direction to get a vector, (and normalize it). bitangent is a unit vector in the direction of the 'v' coordinates of the texture map. As my texture u,v coordinates follow the x and y coordinates of the terrain, then my understanding is that this vector is simply the vector along the surface in the y direction. So should be able to calculate this as simply the difference between vertices in the y direction to get a vector, (and normalize it). However the code I have borrowed seems much more complicated than this and takes into account the actual values of u, and v at each vertex which I don't understand the need for as they increase in exactly the same direction as x, and y. I implemented what I thought from above, and it simply doesn't work, the normals are clearly not working for lighting. Have I misunderstood something? Or can someone explain to me the physical meaning of the tangent and bitangent vectors when applied to a mesh generated from a hightmap like this, when u and v texture coordinates map along the x and y directions. Thanks for any help understanding this.

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• Gamemaker: Making a bullet Spawn at the enemy it was called from

  - by Strokes

  I'm making a gamemaker game with gml. In this game I have multiple enemies (same object) on screen at the same time. I want them to all spawn a bullet at their location. But instead each enemy spawns a bullet at one single enemy. They all shoot but the bullets appear in the wrong location. I want the bullet to spawn at the location of the instance is was called for. How do I do this? Thank you for reading my question. Code: obj_carrier is the enemy I want to spawn from. obj_carrier_bullet is the bullet I want to spawn at location of the carrier There are multiple carriers around the stage. In the step event of the carrier following an if statement: instance_create(obj_carrier.x, obj_carrier.y, obj_carrier_bullet)

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• Obtaining In game Warcraft III data to program standalone AI

  - by Slav

  I am implementing common purpose behavioral algorithm and would like to test it under my lovely Warcraft III game and watch how it will fight against real players. The problem is how to obtain information about in game state (units, structures, environment, etc. ). Algorithm needs access to hard drive and possibly distributed computing, that's why JASS (WC3 Editor language) usage doesn't solve the issue. Direct 3D hooking is an approach, but it wasn't done for WC3 yet and significant drawback is inability to watch online at how AI performs since it uses the viewport to issue commands. How in game data can be obtained to a different process in a fastest and easiest way? Thank you.

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• box2d tween what am I missing

  - by philipp

  I have a Box2D project and I want to tween an kinematic body from position A, to position B. The tween function, got it from this blog: function easeInOut(t , b, c, d ){ if ( ( t /= d / 2 ) < 1){ return c/2 * t * t * t * t + b; } return -c/2 * ( (t -= 2 ) * t * t * t - 2 ) + b; } where t is the current value, b the start, c the end and d the total amount of frames (in my case). I am using the method introduced by this lesson of todd's b2d tutorials to move the body by setting its linear Velocity so here is relevant update code of the sprite: if( moveData.current == moveData.total ){ this._body.SetLinearVelocity( new b2Vec2() ); return; } var t = easeNone( moveData.current, 0, 1, moveData.total ); var step = moveData.length / moveData.total * t; var dir = moveData.direction.Copy(); //this is the line that I think might be corrected dir.Multiply( t * moveData.length * fps /moveData.total ) ; var bodyPosition = this._body.GetWorldCenter(); var idealPosition = bodyPosition.Copy(); idealPosition.Add( dir ); idealPosition.Subtract( bodyPosition.Copy() ); moveData.current++; this._body.SetLinearVelocity( idealPosition ); moveData is an Object that holds the global values of the tween, namely: current frame (int), total frames (int), the length of the total distance to travel (float) the direction vector (targetposition - bodyposition) (b2Vec2) and the start of the tween (bodyposition) (b2Vec2) Goal is to tween the body based on a fixed amount of frames: in moveData.total frames. The value of t is always between 0 and 1 and the only thing that is not working correctly is the resulting distance the body travels. I need to calculate the multiplier for the direction vector. What am I missing to make it work?? Greetings philipp

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• My raycaster is putting out strange results, how do I fix it?

  - by JamesK89

  I'm working on a raycaster in ActionScript 3.0 for the fun of it, and as a learning experience. I've got it up and running and its displaying me output as expected however I'm getting this strange bug where rays go through corners of blocks and the edges of blocks appear through walls. Maybe somebody with more experience can point out what I'm doing wrong or maybe a fresh pair of eyes can spot a tiny bug I haven't noticed. Thank you so much for your help! Screenshots: http://i55.tinypic.com/25koebm.jpg http://i51.tinypic.com/zx5jq9.jpg Relevant code: function drawScene() { rays.graphics.clear(); rays.graphics.lineStyle(1, rgba(0x00,0x66,0x00)); var halfFov = (player.fov/2); var numRays:int = ( stage.stageWidth / COLUMN_SIZE ); var prjDist = ( stage.stageWidth / 2 ) / Math.tan(toRad( halfFov )); var angStep = ( player.fov / numRays ); for( var i:int = 0; i < numRays; i++ ) { var rAng = ( ( player.angle - halfFov ) + ( angStep * i ) ) % 360; if( rAng < 0 ) rAng += 360; var ray:Object = castRay(player.position, rAng); drawRaySlice(i*COLUMN_SIZE, prjDist, player.angle, ray); } } function drawRaySlice(sx:int, prjDist, angle, ray:Object) { if( ray.distance >= MAX_DIST ) return; var height:int = int(( TILE_SIZE / (ray.distance * Math.cos(toRad(angle-ray.angle))) ) * prjDist); if( !height ) return; var yTop = int(( stage.stageHeight / 2 ) - ( height / 2 )); if( yTop < 0 ) yTop = 0; var yBot = int(( stage.stageHeight / 2 ) + ( height / 2 )); if( yBot > stage.stageHeight ) yBot = stage.stageHeight; rays.graphics.moveTo( (ray.origin.x / TILE_SIZE) * MINI_SIZE, (ray.origin.y / TILE_SIZE) * MINI_SIZE ); rays.graphics.lineTo( (ray.hit.x / TILE_SIZE) * MINI_SIZE, (ray.hit.y / TILE_SIZE) * MINI_SIZE ); for( var x:int = 0; x < COLUMN_SIZE; x++ ) { for( var y:int = yTop; y < yBot; y++ ) { buffer.setPixel(sx+x, y, clrTable[ray.tile-1] >> ( ray.horz ? 1 : 0 )); } } } function castRay(origin:Point, angle):Object { // Return values var rTexel = 0; var rHorz = false; var rTile = 0; var rDist = MAX_DIST + 1; var rMap:Point = new Point(); var rHit:Point = new Point(); // Ray angle and slope var ra = toRad(angle) % ANGLE_360; if( ra < ANGLE_0 ) ra += ANGLE_360; var rs = Math.tan(ra); var rUp = ( ra > ANGLE_0 && ra < ANGLE_180 ); var rRight = ( ra < ANGLE_90 || ra > ANGLE_270 ); // Ray position var rx = 0; var ry = 0; // Ray step values var xa = 0; var ya = 0; // Ray position, in map coordinates var mx:int = 0; var my:int = 0; var mt:int = 0; // Distance var dx = 0; var dy = 0; var ds = MAX_DIST + 1; // Horizontal intersection if( ra != ANGLE_180 && ra != ANGLE_0 && ra != ANGLE_360 ) { ya = ( rUp ? TILE_SIZE : -TILE_SIZE ); xa = ya / rs; ry = int( origin.y / TILE_SIZE ) * ( TILE_SIZE ) + ( rUp ? TILE_SIZE : -1 ); rx = origin.x + ( ry - origin.y ) / rs; mx = 0; my = 0; while( mx >= 0 && my >= 0 && mx < world.size.x && my < world.size.y ) { mx = int( rx / TILE_SIZE ); my = int( ry / TILE_SIZE ); mt = getMapTile(mx,my); if( mt > 0 && mt < 9 ) { dx = rx - origin.x; dy = ry - origin.y; ds = ( dx * dx ) + ( dy * dy ); if( rDist >= MAX_DIST || ds < rDist ) { rDist = ds; rTile = mt; rMap.x = mx; rMap.y = my; rHit.x = rx; rHit.y = ry; rHorz = true; rTexel = int(rx % TILE_SIZE) } break; } rx += xa; ry += ya; } } // Vertical intersection if( ra != ANGLE_90 && ra != ANGLE_270 ) { xa = ( rRight ? TILE_SIZE : -TILE_SIZE ); ya = xa * rs; rx = int( origin.x / TILE_SIZE ) * ( TILE_SIZE ) + ( rRight ? TILE_SIZE : -1 ); ry = origin.y + ( rx - origin.x ) * rs; mx = 0; my = 0; while( mx >= 0 && my >= 0 && mx < world.size.x && my < world.size.y ) { mx = int( rx / TILE_SIZE ); my = int( ry / TILE_SIZE ); mt = getMapTile(mx,my); if( mt > 0 && mt < 9 ) { dx = rx - origin.x; dy = ry - origin.y; ds = ( dx * dx ) + ( dy * dy ); if( rDist >= MAX_DIST || ds < rDist ) { rDist = ds; rTile = mt; rMap.x = mx; rMap.y = my; rHit.x = rx; rHit.y = ry; rHorz = false; rTexel = int(ry % TILE_SIZE); } break; } rx += xa; ry += ya; } } return { angle: angle, distance: Math.sqrt(rDist), hit: rHit, map: rMap, tile: rTile, horz: rHorz, origin: origin, texel: rTexel }; }

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• Cannot convert parameter 1 from 'short *' to 'int *' [closed]

  - by Torben Carrington

  I'm trying to learn pointers and since I recently learned that short int takes up less memory [2 bytes as apposed to the long int's memory usage of 4 which is the default for int] I wanted to create a pointer that uses the memory address of a short integer. I'm following a tutorial in my book about Pointers and it's using the Swap function. The problem is I receive this error the moment I change everything from int to short int: error C2664: 'Swap' : cannot convert parameter 1 from 'short *' to 'int *' 1 Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Since my code is so small here is the whole thing: void Swap(short int *sipX, short int *sipY) { short int siTemp = *sipX; *sipX = *sipY; *sipY = siTemp; } int main() { short int siBig = 100; short int siSmall = 1; std::cout << "Pre-Swap: " << siBig << " " << siSmall << std::endl; Swap(&siBig, &siSmall); std::cout << "Post-Swap: " << siBig << " " << siSmall << std::endl; return 0; }

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• Is it better to hard code data or find an algorithm?

  - by OghmaOsiris

  I've been working on a boardgame that has a hex grid as the board (the upper right grid in the image below) Since the board will never change and the spaces on the board will always be linked to the same other spaces around it, should I just hard code every space with the values that I need? Or should I use various algorithms to calculate links and traversals? To be more specific, my board game is a 4 player game where each player has a 5x5x5x5x5x5 hex grid (again, the upper right grid in th eimage above). The object is to get from the bottom of the grid to the top, with various obstacles in the way, and each players being able to attack eachother from the edge of their grid onto other players based on a range multiplier. Since the players grid will never change and the distance of any arbitrary space from the edge of the grid will always be the same, should I just hard code this number into each of the spaces, or should I still use a breadth first search algorithm when players are attacking? The only con I can think of for hard coding everything is that I'm going to code 9+ 2(5+6+7+8) = 61 individual cells. Is there anything else that I'm missing that I should consider using more complex algorithms?

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