newone.java

计算机图形学中的一笔画金刚石程序的java实现

//<applet code=NewOne width=700 height=400></applet>
import javax.swing.*;
import java.awt.*;
import java.applet.*;
import java.util.*;
class Point{
	int x,y;
	public Point(){
		this.x=0;
		this.y=0;
	}
	public Point(int x,int y){
		this.x=x;
		this.y=y;
		
	}
	
}
class Line{
	Point first=new Point();
	Point last=new Point();
	public Line(Point f,Point l){
		first=f;
		last=l;
	}
	public void pLine(Graphics g){
		g.drawLine(first.x, first.y, last.x,last.y);
	}
	public boolean same(Line l2){
		if(this.first.x==l2.first.x && this.first.y==l2.first.y && this.last.y==l2.last.y && this.last.x==l2.last.x)
			return true;
		else return false;
		
	}
	public boolean isIn(Iterator i){
		while(i.hasNext()){
			if(this.same((Line)i.next()))
			return true;
		}
		return false;
	}
}
public class NewOne extends Applet{
	int num;
	int sleeptime=50;
	int x0=320,y0=230;
	int n=21,i,j,k,r;                   //n是顶点个数,奇数才能一笔画!
	float t=(float)(6.28318/n);
	Point p[]=new Point[n];
	Vector v=new Vector();
	Iterator it;
	public void init(){
		r=200;
		i=0;
		j=0;
		k=0;
		for(i=0;i<n;i++){
			num+=i;
		}
		
		this.resize(800,800);
		this.setBackground(Color.black);
		
	}
	public void paint(Graphics g){
		g.setColor(Color.green);
		for(i=0;i<n;i++){
			p[i]=new Point();
		}
		for(i=0;i<n;i++){
			p[i].x=(int)(r*Math.cos(i*t)+x0);
			p[i].y=(int)(r*Math.sin(i*t)+y0);
		}
		for(i=0;i<num;i++){
			int m=1;
			while(true){
			k=j+m;
			if(k>=n) k=k-n;
			Line l=new Line(p[j],p[k]);
			it=v.iterator();
			if(!l.isIn(it)){
				l.pLine(g);
				v.add(l);
				j=j+m;
				if(j>=n) j=j-n;
				
				try{
					   Thread.sleep(sleeptime);
					   }
			catch(Exception f){
						   System.out.println("sleep error");
					   }
			break;
			}
			else m++;
		}
			
	}
	}
	public static void main(String asdf[]){
		Applet app=new NewOne();
		JFrame frame=new JFrame("asdf");
		frame.setSize(800,800);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().add(app);
		app.init();
		app.start();
		frame.setVisible(true);}

}