Question

1. 用java设计并实现一个应用程序，绘制以下函数的曲线：

Answer 1

绘制正弦曲线：
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.lang.*;
public class sinx {
public static void main(String[] args) {
DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class DrawFrame extends JFrame {
public DrawFrame() {
//设置标题，窗口大小
setTitle("sinx");
setSize(WIDTH, HEIGHT);
DrawPanel panel = new DrawPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
}
public static final int WIDTH = 400;
public static final int HEIGHT = 400;
}
class DrawPanel extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
int x,y;
double a;
//画正弦曲线
//Graphics g=getGraphics();
for(x=0;x<=360;x+=9)
{
a=Math.sin(x*Math.PI/180);
y=(int)(80+40*a);
g2.drawString("*",x,y);
}
}
}