frame1.java

jbuilder2005

package sin_cos;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.lang.Math;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Frame1 extends JFrame {
    JPanel contentPane;
    BorderLayout borderLayout1 = new BorderLayout();

    public Frame1() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(borderLayout1);
        setSize(new Dimension(400, 300));
        setTitle("Frame Title");
    }
    public void paint(Graphics g)   {
    // 在指定位置（30，60）显示字符串"Java的图形世界!  "
    double x,y;
    int x0,y0;
    x0=20;
    y0=150;
    for (x=0;x<=360.0;x+=1){
        double s;
        s=Math.PI*x/180;
        y=Math.sin(s);
        int x1,y1,x2,y2;
        x1=(int)(20+x);
        y1=(int)(150+100*y);
        g.drawLine(x0,y0,x1,y1);
        x0=x1;
        y0=y1;
    }
}

}