确定圆是否相交

时间:2015-01-23 18:04:02

标签: java swing

我正在开展一个项目,我必须用随机起点和随机大小绘制20个圆圈。然后我必须确定是否有任何圆相交。如果圆与另一个圆相交,我必须将该圆圈着色为绿色。如果圆圈不与另一个圆相交,则颜色需要为红色。我有所有的代码......我想...但是当我运行它时,我仍然得到一些应该是绿色的圆圈,而不是红色。这是我的代码。任何帮助将不胜感激。

import java.awt.Graphics;
import javax.swing.JPanel;
import java.util.Random;
import javax.swing.JFrame;
import java.awt.*;


public class IntersectingCircles extends JPanel
{
    private int[] xAxis = new int [20]; // array to hold x axis points
    private int[] yAxis = new int [20]; // array to hold y axis points
    private int[] radius = new int [20]; // array to hold radius length


    public static void main (String[] args)
    {
        JFrame frame = new JFrame("Random Circles");
        frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add (new IntersectingCircles());

        frame.pack();
        frame.setVisible(true);
    }

    public IntersectingCircles()
    {
        setPreferredSize(new Dimension(1300, 800)); // set window size
        Random random = new Random();

        for (int i = 0; i < 20; i++)
        {
            xAxis[i] = random.nextInt(800) + 100;
            yAxis[i] = random.nextInt(500) + 100;
            radius[i] = random.nextInt(75) + 10;
        }
    }

    public void paintComponent(Graphics g)
    {   
        for (int i = 0; i < 20; i++)
        {   
            int color = 0;

            for (int h = 0; h < 20; h++)
            {               
                if(i < h)
                {
                    double x1 = 0, x2 = 0, y1 = 0, y2 = 0, d = 0;


                    x1 = (xAxis[i] + radius[i]);
                    y1 = (yAxis[i] + radius[i]);
                    x2 = (xAxis[h] + radius[h]);
                    y2 = (yAxis[h] + radius[h]);

                    d = (Math.sqrt(((x2 - x1) * (x2 - x1)) + ((y2 - y1)*(y2 - y1))));

                    if (d > radius[i] + radius[h] || d < (Math.abs(radius[i] - radius[h])))
                    {
                        color = 0;
                    }

                    else
                    {
                        color = 1;
                        break;
                    }
                }
            }

            if (color == 0)
            {
                g.setColor(Color.RED);
                g.drawOval(xAxis[i], yAxis[i], radius[i] * 2, radius[i] * 2);
            }

            else
            {
                g.setColor(Color.GREEN);
                g.drawOval(xAxis[i], yAxis[i], radius[i] * 2, radius[i] * 2);
            }
        }       
    }
}

1 个答案:

答案 0 :(得分:1)

在内部for循环中,您只是将i索引的圈子与带有h索引的圈子进行比较,但仅将i < h的圈子与for (int h = 0; h < 20; h++) { if(i < h) { ... 进行比较,因为条件:

i

因此,您应该将每个h圈与每个for (int h = 0; h < 20; h++) { if(i != h) //note the change here { ... 圈进行比较,除非它们是相同的。你想要的是:

{{1}}