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// Rotating wireframe cube demo // The wireframe square rotates in the applet and it appears to be in 3D! // The wireframe square changes color to demonstrating creating your own colors! // Written by WolfCoder 1-03-2005 import java.awt.*; // Use graphics import java.applet.*; // Use applets import javax.swing.*; // Use swing stuff (GUI) import java.util.*; // Use util { public class CubePanel extends JPanel { private double x_verts[] = {-48,48,48,-48}; // Four vertices for a cube private double y_verts[] = {48,48,-48,-48}; private double shape_save[] = {-48,48,48,-48,48,48,-48,-48}; // Original shape before transformation private double rotation_pos = 0; // Rotation position private double chroma_pos = 64; // Color animation position void CubePanel() { // Does nothing here } private void drawCube (Graphics page, int xpos, int ypos ) { // Reset to original shape for(int index = 0;index < 4;index++) x_verts[index] = shape_save[index]; // Copy X's for(int index = 4;index < 8;index++) y_verts[index-4] = shape_save[index]; // Copy Y's // Rotate all the points like so... double temp_x,temp_y; for(int index = 0;index < 4;index++) { // Rotate the square normally over the y axis in the xyz plane (I think) temp_x = x_verts [index ]* Math. cos(rotation_pos )-y_verts [index ]* Math. sin(rotation_pos ); temp_y = x_verts [index ]* Math. sin(rotation_pos )+y_verts [index ]* Math. cos(rotation_pos ); x_verts[index] = temp_x; y_verts[index] = temp_y; // And the square rotates to look 3D 2x along the x axis in the xyz plane (I think) y_verts [index ] = y_verts [index ]* Math. sin(rotation_pos/ 2); } // Add a degree of rotation rotation_pos += 0.001; chroma_pos++; if(chroma_pos > 255) chroma_pos = 64; // Reset to flash color // Draws the cube in question // Selects the color page.setColor(tempcolor); for(int index = 0;index < 4;index++) { if(index < 3) { page.drawLine((int)x_verts[index]+xpos,(int)y_verts[index]+ypos,(int)x_verts[index+1]+xpos,(int)y_verts[index+1]+ypos); } else { page.drawLine((int)x_verts[index]+xpos,(int)y_verts[index]+ypos,(int)x_verts[0]+xpos,(int)y_verts[0]+ypos); } } } public void paintComponent (Graphics page ) { super.paintComponent(page); // Use a black background setBackground (Color. black); // Draw the cube drawCube(page,128,128); repaint(); } } public void init() { setSize(256,256); getContentPane().add(new CubePanel()); } }
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