这是有bug版，生成(x,y)点的时候忘了考虑x是越来越大的，即x的值是沿着正方向变大的

import java.awt.*;
import java.applet.Applet;
import java.util.Random;

public class j18draw extends Applet
{
    final int LENGTH = 50;
    final int MIN_X  = 10;
    final int MAX_X  = 450;
    final int MIN_Y  = 10;
    final int MAX_Y  = 290;

    int pointsX[];
    int pointsY[];


    public void init()
    {
    pointsX = new int[LENGTH];
    pointsY = new int[LENGTH];
    Random rdX = new Random();
    Random rdY = new Random();

    for(int i = 0; i < LENGTH; ++i)
    {
    int temp = rdX.nextInt(MAX_X + 1);                                                                                                                   //MAX_X + 1是因为nextInt(int value)生成的随机数区间   为[0, value -1]
    pointsX[i] = temp < MIN_X ? temp + 10 : temp;   //生成X，

    temp = rdY.nextInt(MAX_Y + 1);
    pointsY[i] = temp < MIN_Y ? temp + 10 : temp;
    }
    }

    public void start()
    { 
    repaint();
    }

    public void paint(Graphics g)
    {
    g.drawLine(10, 150, 450, 150);      //横轴
    g.drawLine(10, 290, 10, 10);        //纵轴

    for(int i = 0; i < (LENGTH - 1); ++i)
    {
    //把相邻的两个点连起来
    g.drawLine(pointsX[i], pointsY[i], pointsX[i + 1], pointsY[i + 1]);
    }
    }
}


------------------------------------------------------------------------------------------
在HTML中使用
<html>
<head>
<title>
JAVA小程序 画坐标系
</title>
</head>

<body>
<applet code = "j18draw.class"  width = 500  height = 300>
</applet>

</body>

</html>


在浏览器中的效果如下图所示：

 

java 根据经纬度坐标绘制形状 java画坐标图_JAVA