マルチメディアコンピューティング�U

オプション課題

[R6-8]

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

public class Illumination extends Applet {
        Switch sw1,sw2;
        int on1=0, on2=0;

        public void init() {
                setBackground(Color.black);
                sw1=new Switch(this, 1000);
                sw1.start();
                sw2=new Switch(this, 2000);
                sw2.start();
        }

        public void click(Switch sw) {
                if(sw==sw1) {
                        if(on1 == 0)  on1=1;
                        else on1=0;
                };
                if(sw==sw2) {
                        if(on2 == 0)  on2=1;
                        else on2=0;
                };
                repaint();
        }

        public void paint(Graphics g) {
                if(on1==1) g.setColor(Color.red);
                else g.setColor(Color.black);
                g.fillOval(100,90,20,20);
                if(on2==1) g.setColor(Color.green);
                else g.setColor(Color.black);
                g.fillOval(200,90,20,20);
        }
}

class Switch extends Thread {
        int Interval;
        Illumination ilum;

        Switch(Illumination p1, int p2) {
                ilum = p1;
                Interval = p2;
        }

        public void run() {
                int i;
                for( i=0; i<10000; ++i) {
                        try {
                                Thread.sleep(Interval);
                        }
                        catch(InterruptedException e) {
                        }
                        ilum.click(this);
                }
        }
}

図形の回転

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

public class graphicsg13 extends Applet
{
        public void paint(Graphics g)
        {
          Graphics2D g2=(Graphics2D)g;
          Area e1=new Area(new Ellipse2D.Double(100,200,50,100));

          g2.setColor(Color.white);
          g2.fill(e1); 
        
          AffineTransform affine=new AffineTransform();
          affine.rotate(-45.0*Math.PI/180.0, 125, 200);
          g2.setTransform(affine);
          g2.setColor(Color.blue);
          g2.fill(e1);
        }
}

中割法

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

public class nakawari extends Applet implements Runnable {
        Thread th;
        int[] x;
        int[] y;

        double[] xa = {10.0, 100.0, 10.0}; /* 始まりの図形 */
        double[] ya = {10.0, 10.0, 300.0};

        double[] xb = {110.0, 200.0, 200.0}; /* 終わりの図形 */
        double[] yb = {100.0, 100.0, 300.0};

        int c=0;
        
        public void init() {
        
                x= new int[3];
                y= new int[3];
        }
        
        public void start() {
                th= new Thread(this);
                th.start();
        }

        public void run() {
                int x;
                for( x=0; x<10000; ++x) {
                        repaint();
                        try {
                                Thread.sleep(100);
                        }
                        catch(InterruptedException e) {
                        }
                }
        }

        public void paint(Graphics g) {
                int i;

                for(i=0; i<3; i++) {
                        x[i]=(int)(xa[i] + (c/100.0)*(xb[i]-xa[i]));
                        y[i]=(int)(ya[i] + (c/100.0)*(yb[i]-ya[i]));
                }

                g.setColor(Color.red);
                g.fillPolygon(x, y, 3);

                c++;
                if(c==101) c=0;
        }
}