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  • SwapBuffers causes redraw

    - by user146780
    I'm making a Win32 application with OpenGL in the main window (not using GLUT). I have my drawing code in WM_PAINT right now when I call swapBuffers it must be invalidating itself because it is constantly rerendering and using lots of cpu resources. How can I make it only render when it honestly receives WM_PAINT like when using GDI? Thanks

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  • Does a hidden UIViewController consume any resources (iPhone)?

    - by MrDatabase
    My simple iPhone game has two basic "screens": home screen (UIViewController subclass) game screen (UIWindow w/ EAGLLayer where all the OpenGL drawing happens) Currently when the user taps "Play" on the homescreen the UIViewController is just hidden and the game screen is revealed. When the game is over the homescreen UIViewController is unhidden. Does the hidden UIViewController consume any resources when it's hidden?

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  • sequence diagram [UML]

    - by Upul
    Hi All, I have a question regarding sequence diagrams. When drawing sequence diagrams, Is it enough to draw one diagram per user case ? or do we need to draw a set of sequence diagrams to cover each user case instance ? (is a sequence of actions a system performs that yields an observable result of value to a particular Use Case Actor)

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  • UIScrollview : scroll with 2 fingers and not one

    - by AP
    Hello, I have a UIScrollView containing another wiew. This view need to handle single touch event for drawing. For this reason I would like to scroll using 2 fingers. I managed to get this working for 2.x SDK but it's no more working with 3.X series. Do you have idea/workaround for achieving this? Thanks in advance for your help :)

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  • Does OpenGL stencil test happen before or after fragment program runs?

    - by david
    When I set glStencilFunc( GL_NEVER, . . . ) effectively disabling all drawing, and then run my [shader-bound] program I get no performance increase over letting the fragment shader run. I thought the stencil test happened before the fragment program. Is that not the case, or at least not guaranteed? Replacing the fragment shader with one that simply writes a constant to gl_FragColor does result in a higher FPS.

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  • On OSX, how do I gradient fill a path stroke?

    - by Emiel
    Using the plethora of drawing functions in Cocoa or Quartz it's rather easy to draw paths, and fill them using a gradient. I can't seem to find an acceptable way however, to 'stroke'-draw a path with a line width of a few pixels and fill this stroke using a gradient. How is this done?

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  • 2-col layout, one col scrolls vertical, other is fixed. Both scroll horizontal.

    - by Victor P
    Im trying to do a 2 column layout where the left column is very long vertically, and the right column is very long horizontally. When I scroll vertically, I want to move up and down the left column while the right one stays fixed. When I scroll horizontally, both columns move left-right (normal behaviour) I hope this drawing explain it more (sorry for the bad quality): Is this possible to do using only css? If not, how can I do it with javascript? Thanks

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  • How to draw a line between points in google map in Android

    - by wafa.cs1
    Hello I already wrote a program that read locations from android GPS ; each locatin(long , lat) will be sent to remote server to save it and display it in a website map. what I'm trying to do now is to display my path in android by drawing line between the points I didn't find any sufficient answer until this moment! so how this can be done?

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  • Save image in Windows Mobile 5.0 using C#

    - by Vijay V
    Hi I am saving image in windows mobile application using C#.My code is SaveFileDialog dialog = new SaveFileDialog(); if (dialog.ShowDialog() == DialogResult.OK) { aspectRatioPictureBox1.Photo.Save(dialog.FileName, System.Drawing.Imaging.ImageFormat.Bmp); } In the above code i am able to save only in folders of MyDocument But i am not able to browse to save in other folders.. Please let know the code to save image through browsing the location Thanks in Advance

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  • Using a Windows Forms icon in WPF

    - by flobadob
    I've got this WPF code which works... Uri iconUri = new Uri("pack://application:,,,/media/images/VS.ico", UriKind.RelativeOrAbsolute); this.Icon = BitmapFrame.Create(iconUri); I'm using a windows forms notifyIcon control in my WPF app, and I now need to assing the Icon to it. How do I get from my WPF icon to a System.Drawing.Icon ?

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  • MouseWheel Event Fire

    - by Rahat
    I have a problem on calling my private method on MouseWheel event. In fact my mouse wheel event gets fired properly when i only increment a variable or display something in Title bar etc. But when i want to call a private method, that method gets called only one time which is not the requirement i want to call that method depending on the speed of scroll i.e. when scroll is done one time slowly call the private method one time but when the scroll is done in high speed call the private method more than one time depending on the scroll speed. For further explanation i am placing the sample code which displays the value of i in Title bar and add it in the Listbox control properly depending on the scroll speed but when i want to call the private method more than one time depending upon the scroll speed, that method gets called only one time. public partial class Form1 : Form { ListBox listBox1 = new ListBox(); int i = 0; public Form1() { InitializeComponent(); // Settnig ListBox control properties this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right))); this.listBox1.FormattingEnabled = true; this.listBox1.Location = new System.Drawing.Point(13, 13); this.listBox1.Name = "listBox1"; this.listBox1.Size = new System.Drawing.Size(259, 264); this.listBox1.TabIndex = 0; // Attaching Mouse Wheel Event this.listBox1.MouseWheel += new MouseEventHandler(Form1_MouseWheel); // Adding Control this.Controls.Add(this.listBox1); } void Form1_MouseWheel(object sender, MouseEventArgs e) { i++; this.Text = i.ToString(); this.listBox1.Items.Add(i.ToString()); // Uncomment the following line to call the private method // this method gets called only one time irrelevant of the // mouse wheel scroll speed. // this.LaunchThisEvent(); } private void Form1_Load(object sender, EventArgs e) { this.listBox1.Select(); } private void LaunchThisEvent() { // Display message each time // this method gets called. MessageBox.Show(i.ToString()); } } How to call the private method more than one time depending upon the speed of the mouse wheel scroll?

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  • import existing image to Zend_PDF

    - by terrani
    Hi, I am trying to import an image with Zend_PDF. I would like to display an image on my PDF that is generated by Zend_PDF. I read Zend_PDF manually, but it seems like that Zend_PDF only support drawing image. Any ideas?

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  • dotted stroke in <canvas>

    - by Sam
    I guess it is not possible to set stroke property such as CSS which is quite easy. With CSS we have dashed, dotted, solid but on canvas when drawing lines/or strokes this doesn't seem to be an option. How have you implemented this? I've seen some examples but they are really long for such a silly function. For example: http://groups.google.com/group/javascript-information-visualization-toolkit/browse_thread/thread/22000c0d0a1c54f9?pli=1

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  • How to convert any text/font to its bezier path representation?

    - by yizzreel
    I have a bezier path library to draw complex bezier paths without problem. Now, I need to know how to read a text or font and extract its path information to draw it as a path instead of as text. I came across a C applicaiton, FontForge. It does exactly what I need, picks any font and extract its path information. But what I need to know is how it does it to add that feature to my drawing library.

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  • Which JavaScript graphics library has the best performance?

    - by DNS
    I'm doing some research for a JavaScript project where the performance of drawing simple primitives (i.e. lines) is by far the top priority. The answers to this question provide a great list of JS graphics libraries. While I realize that the choice of browser has a greater impact than the library, I'd like to know whether there are any differences between them, before choosing one. Has anyone done a performance comparison between any of these?

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  • When is 'drawRect' called?

    - by Egil
    I have some custom drawing code in drawRect which also performs some calculation of sizes. When is the earliest I can be sure that this code has been loaded, e.g. if I want to modify it's containers size accordingly?

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  • Canvas and HTML5: Supported Browsers?

    - by Paddy
    I am looking at using HTML5 Canvas element for my upcoming project. I want to know what all major browsers (including the versions!, cos i know that the latest builds do support canvas) support the Canvas tag. I don't give a damn about IE. So don't bother reporting IE. :) In this tutorial Drawing shapes - MDC, the quadraticCurveTo section says: quadraticCurveTo(cp1x, cp1y, x, y) // BROKEN in Firefox 1.5 (see work around below) Does that mean that Canvas is supported on Firefox 1.5 and above too?

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  • GDI+: Set all pixels to given color

    - by Charles
    What is the best way to set the RGB components of every pixel in a System.Drawing.Bitmap to a single, solid color? If possible, I'd like to avoid manually looping through each pixel to do this. Note: I want to keep the same alpha component from the original bitmap. I only want to change the RGB values. I looked into using a ColorMatrix or ColorMap, but I couldn't find any way to set all pixels to a specific given color with either approach.

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  • Error:A generic error occurred in GDI+

    - by sanfra1983
    Hi, I created a web project on the server, and when I upload an image shows me the error Error: A generic error occurred in GDI +. I have read many links on the net that talk about this issue, and although I made the changes, nothing went wrong. I was thinking if the case is not an issue of permissions to folders. In fact I have two folders one inside the other. This is the code to resize the image: public Bitmaps ResizeImage (Stream stream, int? width, int? height) ( System.Drawing.Bitmap bmpOut = null; const int defaultWidth = 800; const int defaultHeight = 600; int width = lnWidth == null? defaultWidth: (int) width; int height = lnHeight == null? defaultHeight: (int) height; try ( LoBMP bitmap = new Bitmap (stream); ImageFormat loFormat = loBMP.RawFormat; decimal lnRatio; lnNewWidth int = 0; lnNewHeight int = 0; if (loBMP.Width <& & lnWidth loBMP.Height <lnHeight) ( loBMP return; ) if (loBMP.Width> loBMP.Height) ( lnRatio = (decimal) lnWidth / loBMP.Width; lnNewWidth = lnWidth; decimal = lnTemp loBMP.Height lnRatio *; lnNewHeight = (int) lnTemp; ) else ( lnRatio = (decimal) lnHeight / loBMP.Height; lnNewHeight = lnHeight; decimal = lnTemp loBMP.Width lnRatio *; lnNewWidth = (int) lnTemp; ) bmpOut = new Bitmap (lnNewWidth, lnNewHeight); Graphics g = Graphics.FromImage (bmpOut); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.FillRectangle (Brushes.White, 0, 0, lnNewWidth, lnNewHeight); g.DrawImage (loBMP, 0, 0, lnNewWidth, lnNewHeight); loBMP.Dispose (); ) catch ( return null; ) bmpOut return; ) and this is the code that I insert in the codebehind: string filepath = AppDomain.CurrentDomain.BaseDirectory + img_veterinario / "; string = filepathM AppDomain.CurrentDomain.BaseDirectory + img_veterinario / img_veterinarioM; Reseize Reseize R = new (); Bitmap = photosFileOriginal r.ResizeImage (fucasiclinici.PostedFile.InputStream, 400, 400); Bitmap = photosFileMiniatura r.ResizeImage (fucasiclinici.PostedFile.InputStream, 72, 72); String filename = Path.GetFileName (fucasiclinici.PostedFile.FileName); photosFileOriginal.Save (Path.Combine (filepath, filename)); photosFileMiniatura.Save (Path.Combine (filepathM, filename)); Can you help me? Thanks

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  • Algorithms behind FarmVille Game

    - by Vadi
    What are all the algorithms involved in Farmville game, specifically I am interested in drawing trees that has fruits based on user's activities. I am into a project which has a specific need to draw a tree-type image in SVG. I am not sure how to go about the algorithms to define the tree and based on certain business rules the leafs in the tree grows etc., I think you get the idea. Farmville is just an example I took to explain. Any help is greatly appreciated..

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