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• Can dummy objects be simulated on iphone?

  - by Mike

  I come from 3D animation and one of the basic things all 3D software have is the ability to create dummy objects. Dummy objects can be used to groups objects that can be rotated, moved or scaled together around a specific anchor point. This is the idea of what I am asking. Obviously we can have fake dummies by using a view and put other views as subviews, but this has problems as the view receives clicks and sometimes you don't want it to do so. You cannot change the anchorpoint of a view too. So, the dummies as I ask have, at least, these properties: adjustable anchor point it is not clickable it is totally invisible (cannot be rendered). any scale, rotation and translation of a dummy are propagated to the grouped objects considering the dummy's anchor point. it is totally animatable. Can this be simulated on iPhone? Is there any object that can be created to simulate this? thanks.

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• Find coordinate by angle

  - by George Johnston

  I am developing in application in XNA which draws random paths. Unfortunately, I'm out of touch with graphing, so I'm a bit stuck. My application needs to do the following: Pick a random angle from my origin (0,0), which is simple. Draw a circle in relation to that origin, 16px away (or any distance I specify), at the angle found above. (Excuse my horrible photoshoping) The second circle at (16,16) would represent a 45 degree angle 16 pixels away from my origin. I would like to have a method in which I pass in my distance and angle that returns a point to graph at. i.e. private Point GetCoordinate(float angle, int distance) { // Do something. return new Point(x,y); } I know this is simple, but agian, I'm pretty out of touch with graphing. Any help? Thanks, George

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• Quaddratic Bezier Curve: Calculate Tangent

  - by stefan.at.wpf

  Hello, I have have a quadratic bezier curve and I want to calculate the slope of the tangent in a given point. For example, let it be the middlepoint of the quadratic bezier curve, therefore t=0.5 (please see the link below for a picture of this). I've calculated the first derivation of the formula for the quadratic bezier curve, however I get 400 as value for the slope, though it should be 0. Maybe I'm using the first derivation in a wrong way? I know I could also calculate the tangents using trigonometric functions, however I'd like to do it using the first derivation, shouldn't this be possible? Thanks for any hint! For clarification / please note: I'm interested in a general way to get the slope in a arbitrary given point on a quadratic bezier curve, not only to get the tangent in the start- and end point. A picture of my problem including the text above: http://cid-0432ee4cfe9c26a0.skydrive.live.com/self.aspx/%c3%96ffentlich/Quadratic%20Bezier%20Curve.pdf Thank you very much for any hint!

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• MSBuild Override Project Reference to resolve to Precompiled Assembly

  - by Ryu

  Situation I have about 400 csproj files using project references. About 3 of those a separate team wants to fork and incorporate into a standalone app. I branched the 3 projects of interest, and because the separate team uses a diff SVN repo I used svn externals to pull in these projects into the folder of the standalone app. Obviously since this team uses a different folder structure the project references no longer resolve. Attempted Solution I figured setting the msbuild properties ReferencePath and AdditionalLibPaths to point to a directory with all the precompiled dependencies would allow the project references a fallback point and resolve correctly. However that doesn't appear to be the case. Question Does anybody know a way to have a failed projectreference look up resolve to the precompiled dll? Perhaps point me to an automated tool to convert projectreferences to dll references? Or is there a better way to solve this problem? Thanks

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• Interpolating 2d data that is piecewise constant on faces

  - by celil

  I have an irregular mesh which is described by two variables - a faces array that stores the indices of the vertices that constitute each face, and a verts array that stores the coordinates of each vertex. I also have a function that is assumed to be piecewise constant over each face, and it is stored in the form of an array of values per face. I am looking for a way to construct a function f from this data. Something along the following lines: faces = [[0,1,2], [1,2,3], [2,3,4] ...] verts = [[0,0], [0,1], [1,0], [1,1],....] vals = [0.0, 1.0, 0.5, 3.0,....] f = interpolate(faces, verts, vals) f(0.2, 0.2) = 0.0 # point inside face [0,1,2] f(0.6, 0.6) = 1.0 # point inside face [1,2,3] The manual way of evaluating f(x,y) would be to find the corresponding face that the point x,y lies in, and return the value that is stored in that face. Is there a function that already implements this in scipy (or in matlab)?

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• DependencyProperty ignores OnPropertyChanged();

  - by Kovpaev Alexey

  I have PointsListView and PointContainer: INotifyPropertyChanged, ICollection<Point>. public class PointContainer: INotifyPropertyChanged, ICollection<Point> { public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) PropertyChanged(this, e); } public IEnumerable<Point> Points { get { return points.Values; } } public void Clear() { points.Clear(); OnPropertyChanged(new PropertyChangedEventArgs("Points")); } ... } For the reliability I made a binding from code: private void BindPointContainerToListView() { Binding binding = new Binding(); binding.Source = PointContainer; binding.Path = new PropertyPath("Points"); PointsListView.SetBinding(ListView.ItemsSourceProperty, binding); } Why when change PointContainer is not automatically updated PointsListView.ItemsSource. PointsListView.Items.Refresh (); solves the problem, but why does not work automatically? What am I doing wrong?

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• 3D Triangle - WPF

  - by user300423

  I am trying to apply an image brush to a Triangle in WPF without success. What am i doing wrong? This is my attempt: Dim ModelTri As New MeshGeometry3D ModelTri.Positions.Add(New Point3D(0, 0, 0)) ModelTri.Positions.Add(New Point3D(100, 0, 0)) ModelTri.Positions.Add(New Point3D(100, 100, 0)) Dim MeshTri As New MeshGeometry3D MeshTri.TriangleIndices.Add(0) MeshTri.TriangleIndices.Add(1) MeshTri.TriangleIndices.Add(2) 'Texture Dim TexturePoints As New PointCollection TexturePoints.Add(New Point(100, 0)) TexturePoints.Add(New Point(0, 100)) TexturePoints.Add(New Point(100, 100)) MeshTri.TextureCoordinates = TexturePoints 'Image Brush Dim imgBrush As New ImageBrush() imgBrush.ImageSource = New BitmapImage(New Uri("Mercury.jpg", UriKind.Relative)) imgBrush.Stretch = Stretch.Fill imgBrush.TileMode = TileMode.Tile imgBrush.SetValue(NameProperty, "imgBrush") Dim Mat As Material Dim DMaterial As New DiffuseMaterial DMaterial.Brush = imgBrush Dim Bind As New Binding("imgBrush") Bind.Source = imgBrush BindingOperations.SetBinding(DMaterial, BindingGroupProperty, Bind) 'This doesnt work Mat = DMaterial 'This works 'Mat = New DiffuseMaterial(New SolidColorBrush(Colors.Khaki)) Dim triangleModel As GeometryModel3D = New GeometryModel3D(ModelTri, Mat) Dim model As New ModelVisual3D() model.Content = triangleModel Viewport.Children.Add(model)

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• Visual Stuido debug problem

  - by cagin

  Hi there, I have a web application. I am developing on Visual Studio 2008. I want to debug my codes and i m putting a break point on page load event of my master page. But V.S doesnt stop on break point line when the project runnging first. But when i change a dropdownlist's item, V.S stop on break point line. I need to see some values at first loading. I dont know what can i do. Thanks for your help

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• How to draw a full ellipse in a StreamGeometry in WPF?

  - by romkyns

  The only method in a StreamGeometryContext that seems related to ellipses is the ArcTo method. Unfortunately it is heavily geared to joining lines rather than drawing ellipses. In particular, the position of the arc is determined by a starting and ending point. For a full ellipse the two coincide obviously, and the exact orientation becomes undefined. So far the best way of drawing an ellipse centered on 100,100 of size 10,10 that I found is like this: using (var ctx = geometry.Open()) { ctx.BeginFigure(new Point(100+5, 100), isFilled: true, isClosed: true); ctx.ArcTo( new Point(100 + 5*Math.Cos(0.01), 100 + 5*Math.Sin(0.01)), // need a small angle but large enough that the ellipse is positioned accurately new Size(10/2, 10/2), // docs say it should be 10,10 but in practice it appears that this should be half the desired width/height... 0, true, SweepDirection.Counterclockwise, true, true); } Which is pretty ugly, and also leaves a small "flat" area (although not visible at normal zoom levels). How else might I draw a full ellipse using StreamGeometryContext?

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• Is the Silverstripe CMS as easy to deploy, maintain, and develop on as it appears?

  - by Thomas Owens

  Although I haven't thought about deploying it on my own site, someone I know sent me a link to a CMS called SilverStripe that I've never heard of before. I read their site, looked at and played around with their demo, and so on. It looks like it's a CMS backed by a custom PHP framework that they call Sapphire. And from what I can gather on their website and using their demo, it potentially might be as good and easy as they say (once you get past any learning curve, which appears to be small, considering it looks a lot like other PHP frameworks and CMSes). Has anyone here ever deployed, maintained, or developed a CMS using SilverStripe? If so, could you shed some light on it, from a developer's point-of-view? I also found this earlier question about SilverStripe here on StackOverflow, but I'm more interested from a development point of view than a user or administrator point of view.

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• Image Drawing on UIView

  - by user1180261

  I'm trying to create an application where I can draw a lot of pictures at a specific point (determined for each image) on one view. I have a coordinates where I need draw a picture, width and height of it For example: I have 2 billion jpeg's images. for each images I have a specific origin point and size. In 1 second I need draw on view 20-50 images in specific point. I have already tryid solve that in the next way: UIGraphicsBeginImageContextWithOptions(self.previewScreen.bounds.size, YES, 0); [self.previewScreen.image drawAtPoint:CGPointMake(0, 0)]; [image drawAtPoint:CGPointMake(nRect.left, nRect.top)]; UIImage *imagew = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [self.previewScreen setImage:imagew]; but in this solution I have a very big latency with displaying images and big CPU usage WBR Maxim Tartachnik

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• Convert Double to String without precision loss in javascript

  - by holger

  I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.

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• How to remove some of the TimeSeries titles in a AChartEngine Time Series View

  - by user1831310

  As a workaround of not being able to change colors of selected points in a series on an AChartEngine Time Chart, I was using an additional series for each point whose color has to be changed. I need to disable series titles for those additional series. Using empty string as the argument to the Time Series construtor: TimeSeries ts = TimeSeries(""); still results in the line-and-point symbol being placed with empty series title string under the X-axis labels for each such series. It would be a desirable feature for AChartEngine to remove both the line-and-point symbol and the series title string for a series created with a null argument to the TimeSeries construtor call: TimeSeries ts = TimeSeries(null); But this currently resulted in nullPointerException instead. Would the AChartEngine developers consider the above suggestion and until then, is there a way to remove some of the TimeSeries titles from a AChartEngine Time Series View? Best regards.

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• How can you calculate the X/Y coordinate to zoom to

  - by Mark

  Im writing a WPF application that has a zoom and pan ability, but what I want to also implement is the ability to zoom and pan "automatically" (via a button click). I have the methods all defined to zoom and pan, but Im having trouble telling the app the desired X/Y coordinates for the panning. Basically, I know that I want the control to be centered at a desired zoom level (say zoomed in 6X times), but the panning destination point is NOT the center point of the control because after the zooming, its been scaled. Does anyone know a way of calculating the desired X/Y position to pan to, taking into account the zooming as well? Do I just scale the desired destination Point? It doesnt seem to work for me... Thanks a lot

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• How do chains work in Rainbow tables?

  - by James Moore

  Hello, I was wondering if should one could explain in detail how chains work in rainbow tables as though you would a complete novice but with relevance to programming. I understand that a chain is 16 bytes long. 8 bytes mark the starting point and 8 mark the end. I also understand that in the filename we have the chain length i.e. 2400. Which means that between our starting point and end point in just 16 bytes we have 2400 possible clear texts? What? How does that work? in those 16 bytes how do i get my 2400 hashes and clear texts or am i miss understanding this? Your help is greatly appreciated. Thanks P.s. I have read the related papers and googled this topic a fair bit. I think im just missing something important to make these gears turn.

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• Guiding a Robot Through a Path

  - by Hamza Yerlikaya

  I have a field filled with obstacles, I know where they are located, and I know the robot's position. Using a path-finding algorithm, I calculate a path for the robot to follow. Now my problem is, I am guiding the robot from grid to grid but this creates a not-so-smooth motion. I start at A, turn the nose to point B, move straight until I reach point B, rinse and repeat until the final point is reached. So my question is: What kind of techniques are used for navigating in such an environment so that I get a smooth motion? The robot has two wheels and two motors. I change the direction of the motor by turning the motors in reverse. EDIT: I can vary the speed of the motors basically the robot is an arduino plus ardumoto, I can supply values between 0-255 to the motors on either direction.

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• How to add labels on Google Maps Pinpoints?

  - by Jason

  Creating a google map with store locations within 50 miles of user entered address. Have map & pinpoints showing correctly but all of the pinpoints just have a dot on them. I'd like to be able to label them A, B, C, D, etc so that I can list out locations & addresses in sidebar. How would I do this? Here's the code I'm using to add my pinpoints. var point = new GLatLng(latitude, longitude); var marker = new GMarker(point); GEvent.addListener(marker, "click", function () { map.openInfoWindowHtml(point, myHtml); }); map.addOverlay(marker);

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• How to add a weather info to be evalueated only once???

  - by Savvas Sopiadis

  Hi everybody! In a ASP.MVC (1.0) project i managed to get weather info from a RSS feed and to show it up. The problem i have is performance: i have put a RenderAction() Method in the Site.Master file (which works perfectly) but i 'm worried about how it will behave if a user clicks on menu point 1, after some seconds on menu point 2, after some seconds on menu point 3, .... thus making the RSS feed requesting new info again and again and again! Can this somehow be avoided? (to somehow load this info only once?) Thanks in advance!

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• Touching an object in a tweened animation?

  - by Michael

  I'm having trouble porting a simple game I developed for the iPhone over to Android. The game has an animated ball which moves from Point A to Point B. The user must touch the ball before it reaches point B or lose the game. This was easy to implement on the iPhone using Core Animation since I could locate the current position of the ball by accessing its animation layer. In Android, I attempted to recreate the game using tweened animation and represented the ball as a Drawable. My issue is that I can't determine if the user is touching the spot because the Drawable apparently bounds do not update as the ball visually moves - making the program think the ball is always in its original position. While searching these forums I saw an Android team dev. confirm that you can't get the current location in a tweened animation but offered no solution for a workaround. Can I accomplish this on the Android using my current approach? If not, what approach should I use? Best regards, Michael

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• How would you sample a real-time stream of coordinates to create a Speed Graph?

  - by Andrew Johnson

  I have a GPS device, and I am receiving continuous points, which I store in an array. These points are time stamped. I would like to graph distance/time (speed) vs. distance in real-time; however, I can only plot 50 of the points because of hardware constraints. How would you select points from the array to graph? For example, one algorithm might be to select every Nth point from the array, where N results in 50 points total. Code: float indexModifier = 1; if (MIN(50,track.lastPointIndex) == 50) { indexModifier = track.lastPointIndex/50.0f; } index = ceil(index*indexModifier); Another algorithm might be to keep an array of 50 points, and throw out the point with the least speed change each time you get a new point.

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• How to draw the "trail" in a maze solving application

  - by snow-spur

  Hello i have designed a maze and i want to draw a path between the cells as the 'person' moves from one cell to the next. So each time i move the cell a line is drawn Also i am using the graphics module The graphics module is an object oriented library Im importing from graphics import* from maze import* my circle which is my cell center = Point(15, 15) c = Circle(center, 12) c.setFill('blue') c.setOutline('yellow') c.draw(win) p1 = Point(c.getCenter().getX(), c.getCenter().getY()) this is my loop if mazez.blockedCount(cloc)> 2: mazez.addDecoration(cloc, "grey") mazez[cloc].deadend = True c.move(-25, 0) p2 = Point(getX(), getY()) line = graphics.Line(p1, p2) cloc.col = cloc.col - 1 Now it says getX not defined every time i press a key is this because of p2???

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• Is this code well-defined?

  - by Nawaz

  This code is taken from a discussion going on here. someInstance.Fun(++k).Gun(10).Sun(k).Tun(); Is this code well-defined? Is ++k Fun() evaluated before k in Sun()? What if k is user-defined type, not built-in type? And in what ways the above function calls order is different from this: eat(++k);drink(10);sleep(k); As far as I can say, in both situations, there exists a sequence point after each function call. If so, then why can't the first case is also well-defined like the second one? Section 1.9.17 of the C++ ISO standard says this about sequence points and function evaluation: When calling a function (whether or not the function is inline), there is a sequence point after the evaluation of all function arguments (if any) which takes place before execution of any expressions or statements in the function body. There is also a sequence point after the copying of a returned value and before the execution of any expressions outside the function.

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• Real life usage of the projective plane theory

  - by Elazar Leibovich

  I'm learning about the theory of the projective plane. Very generally speaking, it is an extension of the plane, which includes additional points which are defined as the intersection points of two parallel lines. In the projective plane, every two lines have an interesection point. Whether they're parallel or not. Every point in the projective plane can be represented by three numbers (you actually need less than that, but nevemind now). Is there any real life application which uses the projective plane? I can think that, for instance, a software which needs to find the intersections of a line, can benefit from always having an intersection point which might lead to simpler code, but is it really used?

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• Interview question: Check if one string is a rotation of other string.

  - by Webdev

  A friend of mine was asked the following question today at interview for the position of software developer. Given two string s1 and s2 how will you check if s1 is a rotated version of s2 ? Example: if s1 = "stackoverflow"; then the following are some of its rotated versions: "tackoverflows" "ackoverflowst" "overflowstack" where as "stackoverflwo" is not a rotated version. The answer he gave was: Take s2 and find the logest prefix that is a substring of s1, that will give you the point of rotation. Once you find that point, break s2 at that point to get s2a and s2b, then just check if concatenate(s2a,s2b) == s1 It looks like a good solution to me and my friend. But the interviewr though otherwise. He asked for a simpler solution. Please help me by telling how would you do this in Java/C/C++ ? Thanks in advance.

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• How i access the array of CGPoints to draw the graph?

  - by Rajendra Bhole

  Hi, I have the code in which i want to develop the graph.The code is, NSArray *coordinate = [[NSArray alloc] initWithObjects: @"42,213", @"75,173", @"108,153", @"141,133", @"174,113", @"207,73", @"240,33", nil]; CGContextSetRGBFillColor(ctx, 255, 0, 0, 1.0); CGContextSetLineWidth(ctx, 8.0); for(int intIndex = 0; intIndex < [coordinate count]; fltX1+=33, intIndex++) { CGContextMoveToPoint(ctx, fltX1+37, fltY2+18); CGPoint point = [[coordinate objectAtIndex:intIndex] CGPointValue]; CGContextAddLineToPoint(ctx, point); CGContextStrokePath(ctx); } The problem is that the function of CGContextAddLineToPoint(ctx, point); not working properly. How i drawing the line in the graph using above code????????

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