sincurve.java

来自「自编的十个Java applet小程序」· Java 代码 · 共 30 行

import java.awt.*;
import java.awt.geom.*;
import java.applet.*;
public class sinCurve extends Applet{
	public void paint(Graphics g){
		Graphics2D g2d=(Graphics2D)g;
		int offx=40;
		int offy=80;
		g2d.setPaint(Color.blue);
		g2d.setStroke(new BasicStroke(2));
		g2d.draw(new Line2D.Float(offx+0,offy-60,offx+0,offy+60));
		g2d.draw(new Line2D.Float(offx-5,offy-57,offx+0,offy-60));
		g2d.draw(new Line2D.Float(offx+5,offy-57,offx+0,offy-60));
		g2d.draw(new Line2D.Float(offx+0,offy+0,offx+380,offy+0));
		g2d.draw(new Line2D.Float(offx+376,offy-5,offx+380,offy+0));
        g2d.draw(new Line2D.Float(offx+376,offy+5,offx+380,offy+0));
        g2d.drawString("x",offx+385,offy);
        g2d.drawString("y",offx,offy-66);
        
        GeneralPath polly=new GeneralPath();
        polly.moveTo(offx,offy);
        for(int jd=0;jd<=360;jd++){
        	float x=jd;
        	float y=(float)(50*Math.sin(jd*Math.PI/180.));
        	polly.lineTo(offx+x,offy-y);
        	}
        	g2d.setPaint(Color.red);
        	g2d.draw(polly);
       }
 }