DE LA 3D FACILE

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class appli3d extends Applet implements AdjustmentListener {
	
	static final int N=150, X=0, Y=1, Z=2;
	
	int initial=0, visible=1, min=0, max=200;
	Scrollbar sba, sbb;
	double[][] points;
	double alpha, beta;
	
	public void init() {
		points=new double[N][3];
		
		for (int i=0; i<N; i++) {
			points[i][Y]=i*160.0/N-80.0;
			double r=80-i*80.0/N;
			double a=i*2*Math.PI/8;
			points[i][X]=Math.cos(a)*r;
			points[i][Z]=Math.sin(a)*r;
		}
		
		setLayout(new BorderLayout());
		
		sba=new Scrollbar(Scrollbar.VERTICAL, initial, visible, min, max);
		add(sba, BorderLayout.WEST);
		sba.addAdjustmentListener(this);

		sbb=new Scrollbar(Scrollbar.HORIZONTAL, initial, visible, min, max);
		add(sbb, BorderLayout.SOUTH);
		sbb.addAdjustmentListener(this);
		
	}
	
	public void paint(Graphics g) {
		double x,y,z;
		int xp=0, yp=0;
		
		g.setColor(Color.red);
		for (int i=0;i<N;i++) {
			x=points[i][X]*Math.cos(alpha)-points[i][Y]*Math.sin(alpha);
			y=points[i][X]*Math.sin(alpha)+points[i][Y]*Math.cos(alpha);
			z=points[i][Z];
			
			x=x*Math.cos(beta)-z*Math.sin(beta);
			z=x*Math.sin(beta)+z*Math.cos(beta);
			
			if (i>0) g.drawLine(xp,yp,(int)x+150,(int)y+150);
			xp=(int)x+150; yp=(int)y+150;
		}
	}
	
	public void adjustmentValueChanged(AdjustmentEvent e) {
		if (e.getSource()==sba) alpha=e.getValue()*2*Math.PI/100;
		if (e.getSource()==sbb) beta=e.getValue()*2*Math.PI/100;
		repaint();
	}
	
}