graphics

问题 I have some code that looks like that: GraphicsPath p = new GraphicsPath(); // Add some elements to p ... // ... g.FillPath(bgBrush, p); // where g : Graphics and bgBrush : Brush Which results in something that looks like this: ### | ##| ## | How can I fill the exact complement of the path? Desired output: #| ## | # #| 回答1: I'm surprised no one answered so far - the solution is pretty simple. Just add a Rectangle to the path and everything inside gets reverted. protected override void OnPaint

问题 What's the difference between glMatrixMode(GL_PROJECTION); and glMatrixMode(GL_MODELVIEW); #include <stdio.h> #include <GL/gl.h> #include <GL/glut.h> #define KEY_ESCAPE 27 void display(); void keyboard(unsigned char,int,int); int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH ); glutInitWindowSize(600,400); glutCreateWindow("Opengl Test"); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutMainLoop(); return 0; } void display()

问题 I really like littler is really great for scripting using R. But i don't how to use external graphics device a la gnuplot (for example using Octave). I'm able to produce the desired graph but i have to use Sys.sleep and i don't want to do so, because i want to close it my self in an interactive way or better continue the script without closing the device. So far this is what my code looks like : #!/usr/bin/env r -t suppressMessages(require(Cairo)) CairoX11() plot(rnorm(1000), pch = 19) Sys

问题 Consider the following code: procedure TForm1.PaintBox1Paint(Sender: TObject); var vRect : TRect; vFormat : TTextFormat; vStr : string; begin vStr := 'This is some text'; vRect := rect(10,10,50,130); vFormat := [tfCenter,tfVerticalCenter,tfWordBreak]; PaintBox1.Canvas.Rectangle(vRect); PaintBox1.Canvas.TextRect(vRect,vStr,vFormat); end; I would expect something like this +--------+ | | | | |This is | | some | | text | | | | | +--------+ but I get this +--------+ |This is | | some | | text | |

问题 I'm drawing a bunch of lines with the Python Imaging Library's ImageDraw.line(), but they look horrid since I can't find a way to anti-alias them. How can I anti-alias lines in PIL? If PIL can't do it, is there another Python image manipulation library that can? 回答1: aggdraw provides nicer drawing than PIL. 回答2: This is a really quickly hacked together function to draw an anti-aliased line with PIL that I wrote after googling for the same issue, seeing this post and failing to install aggdraw

问题 Given an RGB color in 32-bit unsigned integer form (eg. 0xFF00FF), how would you invert it (get a negative color), without extracting its individual components using bitshift operations? I wonder whether it's possible using just bitwise operations (AND, OR, XOR). More precisely, what's the algorithm that uses the least number of instructions? 回答1: I think it is so simple. You can just calculate 0xFFFFFF-YourColor. It will be the inverted color. int neg = 0xFFFFFF - originalRGB // optional:

问题 I'm trying to get a rectangle to move using KeyListener. I have seen others use the same code but for some reason I can't get it to move. Right now the rectangle does show up. I'm not sure if I'm forgetting something if there is something I'm missing. Here's my code: import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.awt.Graphics; public class roomwars extends JPanel implements ActionListener, KeyListener { //public JPanel pane; public JFrame frame; public JButton

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . Is there any way or workaround to combine/append two System.Drawing.Brush classes together? e.g. Brush b1 = GetFromSomewhere(); Brush b2 = GetFromSomewhereElse(); (something like that...) Brush b3 = b1 + b2; Eventually my purpose is to do something like: Graphics graphics = new Graphics; graphics

问题 In the following application I have put a button ,clicking on which makes the GlassPane visible and a Thread starts which updates the Progress bar value.Below is the code:- import java.awt.Color; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.LinearGradientPaint; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing

问题 I'm curious as to the 'proper' method for achieving the following functionality using Quarts2D: I want to have a view, and to be able to add a circle at any coordinate. As soon as I add the circle it should expand at a predefined rate; I'd also like to repeat this process and have a number if these expanding circles. Think Missile Command: Generally, if I was writing this in C++ using SDL or some other graphics library I would: Have a class to represent an 'growing circle' Have a vector/array