Question

我编写的这个程序应该绘制一个Sierpinski三角形，但每当我用appletviewer在低端计算机上打开它时，它通常会绘制4到60个点。如果我重新打开它而不重新编译它，点数偶尔会从通常的数量上升4.在家里的高端计算机上运行它最好在大约5 000 000次迭代。然而，虽然它绘制的形状相当饱满，但它开始画点，在那里不应该有点。这仅在数字开始变高时才会发生。为什么我的applet不能在低端计算机上运行，为什么它会以更大的值在不正确的位置绘制像素？这是代码：

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

public class Triangle extends Applet implements Runnable {

    Thread runner;
    Random rand = new Random();
    int xCord, yCord;
    double lastX, lastY, currentX, currentY;
    final double topX = 500, topY = 100, leftX = 200, leftY = 700,
                 rightX = 800, rightY = 700;

    public void start() {

        if (runner == null)
        {
            runner = new Thread(this);
            runner.start();
        }
    }

    public void init() {

    lastX = 500;  //Top dot
    lastY = 100;
    }   

    public void run() {

        for(int counter = 1; counter <= 5000000; counter++) {

            int n = rand.nextInt(3) + 1;

            if (n == 1) { //Top dot
                currentX = topX + (lastX - topX) / 2;
                currentY = topY + (lastY - topY) / 2;
                lastX = currentX;
                lastY = currentY;
                xCord = (int)Math.round(currentX);
                yCord = (int)Math.round(currentY);
                repaint();
            } else if (n == 2) { //Left dot
                currentX = leftX + (lastX - leftX) / 2;
                currentY = leftY + (lastY - leftY) / 2;
                lastX = currentX;
                lastY = currentY;
                xCord = (int)Math.round(currentX);
                yCord = (int)Math.round(currentY);
                repaint();
            } else { //Right dot
                currentX = rightX + (lastX - rightX) / 2;
                currentY = rightY + (lastY - rightY) / 2;
                lastX = currentX;
                lastY = currentY;
                xCord = (int)Math.round(currentX);
                yCord = (int)Math.round(currentY);
                repaint();
            }
        }
    }

    public void update(Graphics g) {

        paint(g);
    }
    public void paint(Graphics g) {

        g.fillRect(500, 100, 2, 2); //Top dot, dot 1
        g.fillRect(200, 700, 2, 2); //Bottom left dot, dot 2
        g.fillRect(800, 700, 2, 2); //Bottom right dot, dot 3
        g.fillRect(xCord, yCord, 2, 2); 
    }
}

这是我的HTML文件：

<html>
<body>
<applet code = "Triangle.class" width=999 height=799>
</applet>
</body>
</html>

像素不在java小程序中绘制

0 个答案: