// 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 Cube extends JApplet
{
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
Color tempcolor = new Color(0,0,(int)chroma_pos);
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());
}
}
