drawsin.java

java语言实现的正弦曲线的绘制

import java.applet.Applet;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
class DrawSin extends Applet 
{
	public void paint(Graphics g)
	{
		g.drawString("正弦曲线", 20, 20);
		double X_axis = getSize().width;
		double Y_axis = getSize().height;
		System.out.println("X_axis="+X_axis+", Y_axis="+Y_axis);
		for(int i=0; i<X_axis;i++)
		{
			double x = i;
			double y =  Y_axis/2 - (Y_axis/2)*Math.sin(6.28/X_axis * x);
			System.out.println("x="+x+", y="+y);
			g.drawString(".", (int)x, (int)y);
		}
	}
	public static void main(String[] args) 
	{
		Frame window = new Frame();
		DrawSin app = new DrawSin();
		app.init();                                                                      
		app.start();
		window.add(app);
		window.setSize(400, 300);
		window.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
		window.show();
		window.setVisible(true);
	}
}