graphics

问题 In the BGI library's "graphics.h" header there is a function pieslice in that header file,its syntax is: #include <graphics.h> void pieslice(int x, int y, int stangle, int endangle, int radius); [x,y are the center of the circle,stangle and endangle are the starting and end angles respectively] Can we make a pieslice in C/C++ without using this in-built function of the BGI library.Please help. Tried making it with the help of the lines and mid-point circle generation algorithms. My code so

问题 I'm trying to draw lines with Java Swing. The goal is to open an image inside the panel and draw lines on that image. When I try to draw a single line and drag the mouse, I get this behavior: My code: // Somewhere in the code: imgLabel= new JLabel(new ImageIcon(buffImage)); // buffImage is a BufferedImage ... Point point1; Point point2; Line2D line2d; public void draw() { Graphics2D g1 = this.buffImage.createGraphics(); g1.setRenderingHint(enderingHints.KEY_ANTIALIASING, RenderingHints.VALUE

问题 I'm trying to draw lines with Java Swing. The goal is to open an image inside the panel and draw lines on that image. When I try to draw a single line and drag the mouse, I get this behavior: My code: // Somewhere in the code: imgLabel= new JLabel(new ImageIcon(buffImage)); // buffImage is a BufferedImage ... Point point1; Point point2; Line2D line2d; public void draw() { Graphics2D g1 = this.buffImage.createGraphics(); g1.setRenderingHint(enderingHints.KEY_ANTIALIASING, RenderingHints.VALUE

问题 I'm trying to draw lines with Java Swing. The goal is to open an image inside the panel and draw lines on that image. When I try to draw a single line and drag the mouse, I get this behavior: My code: // Somewhere in the code: imgLabel= new JLabel(new ImageIcon(buffImage)); // buffImage is a BufferedImage ... Point point1; Point point2; Line2D line2d; public void draw() { Graphics2D g1 = this.buffImage.createGraphics(); g1.setRenderingHint(enderingHints.KEY_ANTIALIASING, RenderingHints.VALUE

问题 I am new to drawing and paints in c# & I am trying to make a simple program it has 3 intersecting circles (A,B,C). What i want to do is paint a certain (according to result I get). For example: If I get 1 as a result I want to fill the yellow bordered region, if I get 4 I want to fill green bordered region and so on. My Code to draw these circles: private void button1_Click(object sender, EventArgs e) { Graphics A = this.CreateGraphics(); Graphics B = this.CreateGraphics(); Graphics C = this

问题 I'm trying to visualize a 3D array through Mayavi in Python. I simply want to create a structured 3D voxel grid in which I can show some pre-specified voxel-space-filling points. I do not think that I want The only example that I can find that I think is relatively relevant is this MRI example. I can use the following code to get a somewhat workable example: import numpy as np from mayavi import mlab data = (100, 100, 100) data = np.zeros(data) data[0:50, 50:70, 0:50] = 1 data[0:50, 0:20, 0

问题 I have a 4x4 transformation matrix. However, after trying out the transformation I noticed that movement and rotation of the Y axis is going the opposite way. The rest is correct. I got this matrix from some other API so probably it is the difference of coordinate system. So, how can I flip an axis of transformation matrix? If only translation I can add minus sign on the Y translation, but I have no idea about opposite rotation of only one axis since all the rotation is being represented in

问题 I have a 4x4 transformation matrix. However, after trying out the transformation I noticed that movement and rotation of the Y axis is going the opposite way. The rest is correct. I got this matrix from some other API so probably it is the difference of coordinate system. So, how can I flip an axis of transformation matrix? If only translation I can add minus sign on the Y translation, but I have no idea about opposite rotation of only one axis since all the rotation is being represented in

问题 I was wondering how to go about adding a virtual GPU into Qemu? I have been told it involves adding a new graphics output module that uses OpenGL? 回答1: You probably refer to Create virtual hardware, kernel, qemu for Android Emulator in order to produce OpenGL graphics The very first thing I suggest you do is reading the source code how commands to the virtual graphics adaptors already implemented are turned into graphical output. Then you should rewrite this, to use OpenGL commands instead.

问题 I'm trying to draw a 3d image that displays a ripple: function myFunc(x, y) { let zRipple = Math.pow(2, -0.005 * (Math.abs(x) + Math.abs(y))) * Math.cos(((x * x + y * y) * 2 * pi) / 180 / width) * height; return zRipple; } width and height here are constants that define a drawing area and are equal to 200 in my tests. My approach is based on what I recall from an article that I read 30 years ago and trying to recall now. The idea is to: split the whole drawing board into the 10-pixel grid for