graphics

问题 I've got window on a WinForm that I want to get the bitmap representation of. For this, I use the following code (where codeEditor is the control I want a bitmap representation of): public Bitmap GetBitmap( ) { IntPtr srcDC = NativeMethods.GetDC( codeEditor.Handle ) ; var bitmap = new Bitmap( codeEditor.Width, codeEditor.Height ) ; Graphics graphics = Graphics.FromImage( bitmap ) ; var deviceContext = graphics.GetHdc( ) ; bool blitted = NativeMethods.BitBlt( deviceContext, 0, 0, bitmap.Width,

问题 I am creating a swing font chooser. (See also: How to prevent JComboBox from becoming unresponsive when using a custom ListCellRenderer) To get all available fonts, I do: GraphicsEnvironment gE = GraphicsEnvironment.getLocalGraphicsEnvironment(); Font[] fonts = gE.getAllFonts(); In my font chooser (a JComboBox), which contains all the available fonts, I want to initialize it showing the default system font as selected. To do this, I use a static base font (which is gotten from a static base

问题 I have a JPanel on which some drawing is performed using paintComponent method and after that when ever a user clicks on the JPanel a string is drawn (or any drawing) on it and as the user moves mouse over the JPanel it shows the coordinates in the tooltip of the JPanel . 1) The problem is that when the tooltip comes over the drawn string it erases it but this tooltiptext has no erasing effect on the drawing part which I performed in paintComponent method. I am not able to understand that why

问题 I have the following code <ul id ="menu"> <%foreach (var pckg in Model) { %> <li style = "text-align:center;width:60px;" class = "top-<%=pckg.Controller.ToLower() %>"> li-text </li> <%} %> </ul> and following is the sprite CSS .top-pkg1{ background-position: -184px 0; width: 36px; height: 36px; } .top-pkg2{ background-position: -270px 0; width: 36px; height: 36px; } .top-pkg3{ background-position: -356px 0; width: 36px; height: 36px; } .top-pkg4{ background-position: -517px 0; width: 36px;

问题 I continue to think of the possibilities for the 3d-animation (moving point along a curve). I have written the following code to try it using the hgtransform command but I do not understand why does not work. t = 0:pi/50:10*pi; x = sin(t); y = cos(t); z = t; ah = axes; set(ah,'XLim',[min(x) max(x)],'YLim',[min(y) max(y)],... 'ZLim',[min(z) max(z)]); plot3(x,y,z,'Color','red'); hold on; view(3); hpoint = line('XData',x(1),'YData',y(1),'ZData',z(1),'Color','black','Marker',... 'o','MarkerSize'

问题 I would like to be able to paint Image s onto a JFrame , but whenever I want (not in the JFrame.paint method. For the project I am working on, I have a class Bullseye extends BufferedImage , and am trying to put it onto a JFrame : class DrawingFrame extends JFrame { public void drawImage(Image img, int x, int y) { getGraphics().drawImage(img,x,y,null); repaint(); } } class Main { public static void main(String[] args) { DrawingFrame frame = new DrawingFrame(); Bullseye bullseye = new Bullseye

问题 I'm drawing a path in Flex using Spark:Path. I want to subtract a circle shape from this path, as in the following image: (The path is black and wide) Any ideas? I tried creating a mask using a Shape object but couldn't quite manage to create a mask that has a circular hole in it. 回答1: Found it. No masks involved. I took the Path and wrapped a Group around it: <s:Group blendMode="layer"> <s:Path id="connector" ... /> <s:Ellipse id="hole" blendMode="erase"> I set the blendMode to "layer" and

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I noticed most resources either assume you know a lot already or assume you know math of professional level or assume you're going to find other resources to fill gaps. Is there a resource that takes someone without already a knowledge on view matrices in graphics and takes them to understanding fully how to set

问题 I'm trying to draw maps using Java2D. When my map is zoomed out my roads are full of drawing artefacts. This is a small part of the screen when drawing a complete US state: This is a similar section of the road when zoomed closer in: The line style used is a solid blue line with width scaled to be equivalent to 2 pixels. I've tried various rendering hints and line joining rules and nothing seems to help. I'm using Open JDK 1.7 on a Mac running the OS/X 10.8 and this is also reproducible on a

问题 I have a window created with the WS_EX_LAYERED window style. I am currently drawing onto a memory bitmap using GDI+, and using UpdateLayeredWindow to update the graphical content of my layered window. Here's a snippet of my code: void Redraw(HWND hWnd, int width, int height) { static bool floppy = true; floppy = !floppy; HDC hScreenDC = GetDC(HWND_DESKTOP); HDC hMemDC = CreateCompatibleDC(hScreenDC); HBITMAP hBmp = CreateCompatibleBitmap(hScreenDC, width, height); HGDIOBJ hObj = SelectObject