//-----------------------------------------------------------
//	
//	RotaryEngine for JAVA
//	Copy right(c)1996 Tatsuhiko.Sakamoto All right reserved
//	E-mail PGB02215@niftyserve.or.jp
//-----------------------------------------------------------

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

public class RotaryEngine extends Applet implements Runnable {
	int i;
	int last = 10;
	int cx = 70;
	int cy = 100;
	int	smallR = 10;
	int largeR = 75;
	int roterR = 130;
	int internalGearR;
	int stationaryGearR;
	Polygon RotaryHousingShape = new Polygon();
	Thread thread;

	public void init(){
		stationaryGearR = smallR * 2;
		internalGearR = stationaryGearR + smallR;
		for(int i = 0;i<37;i++)
		{
			int Angle = 360*i/36;
			int x = (int)(Math.cos((Angle*3+180)*Math.PI/180)*smallR
				+ Math.cos(Angle*Math.PI / 180)*largeR);
			int y = (int)(Math.sin((Angle*3+180)*Math.PI/180)*smallR
				+ Math.sin(Angle*Math.PI / 180)*largeR);
			RotaryHousingShape.addPoint(cx+x,cy-y);
		}
	}

	public void start(){
		if(thread == null) {
			thread = new Thread(this);
			thread.start();
		}
	}
	
	public void stop(){
		if (thread != null){
			thread.stop();
			thread = null;
		}
	}
	
	public void paint(Graphics g){
		int Angle = 120*i/last;
		int x = (int)(cx  + Math.cos((Angle*3+180)*Math.PI/180)*smallR);
		int y = (int)(cy + Math.sin((Angle*3+180)*Math.PI/180)*smallR);
		int x1 = (int)(Math.cos(Angle*Math.PI / 180)*largeR);
		int y1 = -(int)(Math.sin(Angle*Math.PI / 180)*largeR);
		int x2 = (int)(Math.cos((Angle+120)*Math.PI / 180)*largeR);
		int y2 = -(int)(Math.sin((Angle+120)*Math.PI / 180)*largeR);
		int x3 = (int)(Math.cos((Angle+240)*Math.PI / 180)*largeR);
		int y3 = -(int)(Math.sin((Angle+240)*Math.PI / 180)*largeR);
		g.drawPolygon(RotaryHousingShape);
		g.drawArc(x+x1-roterR,y-y1-roterR,roterR*2,roterR*2,-Angle + 150,60);
		g.drawArc(x+x2-roterR,y-y2-roterR,roterR*2,roterR*2,-Angle + 30,60);
		g.drawArc(x+x3-roterR,y-y3-roterR,roterR*2,roterR*2,-Angle + 270,60);
		g.drawOval(x-internalGearR,y-internalGearR,
			internalGearR*2,internalGearR*2);
		g.drawOval(cx-stationaryGearR,cy-stationaryGearR,
			stationaryGearR*2,stationaryGearR*2);
	}
	public void run(){
		while(true) {
			try {
				Thread.sleep(80);
			}catch (InterruptedException e){
				break;
			}
			i++;
			if(i >= last){
				i = 0;
			}
			repaint();
		}
	}
}