- Applets : 3D : Kugel -

Eine rotierende Kugel als Java-Applet.

Kugel.java

import java.awt.*;
import java.awt.geom.*;
import java.applet.*;

public class Kugel extends Applet {

    public void init() {
        setBackground(new Color(255,255,255));
    }

    Image buffer;
    Graphics2D gBuffer;

    // Neigung um 23 Grad
    AffineTransform at = AffineTransform.getRotateInstance(Math.toRadians(-23),200,200);

    int rot = 0;

    public void paint(Graphics g) {

        // Double-Buffering
        if (buffer==null) {
            buffer=createImage(this.getSize().width, this.getSize().height);
            gBuffer=(Graphics2D)buffer.getGraphics();
        }

        gBuffer.setTransform(at);

        // Antialiasing
        gBuffer.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

        gBuffer.setColor(new Color(0,0,220));
        gBuffer.fillOval(51,51,298,298);

        gBuffer.setColor(new Color(255,255,255));

        // Kugelposition: 50,50, Durchmesser: 300
        for (int i=1;i<10;i++) {
            // Breitengrade
            double y = 150*Math.cos(Math.toRadians(i*10));
            gBuffer.drawLine(
                200-(int)(Math.sqrt(150*150-y*y)),200-(int)y,
                200+(int)(Math.sqrt(150*150-y*y)),200-(int)y);
            gBuffer.drawLine(
                200-(int)(Math.sqrt(150*150-y*y)),200+(int)y,
                200+(int)(Math.sqrt(150*150-y*y)),200+(int)y);
            // Längengrade
            gBuffer.drawArc(
                50+(int)((300-(300*Math.cos(Math.toRadians(rot+i*10-10))))/2),50,
                (int)(300*Math.cos(Math.toRadians(rot+i*10-10))),300,90,180);
            gBuffer.drawArc(
                50+(int)((300-(300*Math.sin(Math.toRadians(rot+i*10-10))))/2),50,
                (int)(300*Math.sin(Math.toRadians(rot+i*10-10))),300,90,-180);
        }

        if (rot<9) rot++; // Rotation um 1 Grad
        else rot = 0;

        g.drawImage (buffer, 0, 0, this);

        // Verzögerung
        try {Thread.sleep(10);}
        catch (InterruptedException e) {}

        repaint();
    }

    public void update(Graphics g) {paint(g);}
}

Download  Kugel.zip (Applet und Code, ca. 3 kb)

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