triangletest.java

一些员创的简单源码

/**
   程序功能：在框架上绘出正弦和余弦图
*/
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.math.*;
public class TriAngleTest
{
    public static void main(String[] args)
    {
        TriAngleFrame frame=new TriAngleFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.show();
    }
}

//主框架类
class TriAngleFrame extends JFrame
{
	public TriAngleFrame()
	{
		setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
		setTitle("Plus");
		Container content=getContentPane();
		TriAnglePanel panel=new TriAnglePanel();
		content.add(panel);
	}
	public static final int DEFAULT_WIDTH=500;
	public static final int DEFAULT_HEIGHT=450;
}

//主画板类
class TriAnglePanel extends JPanel
{
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Graphics2D g2=(Graphics2D)g;

		//画出X,Y轴，以及箭头
		g2.draw(new Line2D.Double(60,150,400,150));
		g2.draw(new Line2D.Double(395,145,400,150));
		g2.draw(new Line2D.Double(395,155,400,150));
		g2.draw(new Line2D.Double(60,50,60,220));
		g2.draw(new Line2D.Double(55,55,60,50));
		g2.draw(new Line2D.Double(65,55,60,50));

		//画出正弦线
		for(int i=60;i<300;i++)
		{
           double angle=(i-60)*(Math.PI)/30;
           double y=150-Math.sin(angle)*30;                             //正弦线由一系列的点构成
           g2.draw(new Line2D.Double(i,y,i,y));
	    }

	    //画出余弦的X，Y轴
	    g2.draw(new Line2D.Double(60,300,400,300));
		g2.draw(new Line2D.Double(395,295,400,300));
		g2.draw(new Line2D.Double(395,305,400,300));
		g2.draw(new Line2D.Double(60,180,60,370));

		//画余弦线
		for(int i=60;i<300;i++)
		{
			double angle=(i-60)*(Math.PI)/30;
			double y=300-Math.cos(angle)*30;
			g2.draw(new Line2D.Double(i,y,i,y));
		}
    }
}