用java随机画出两个圆，判断它们是否相交
import java.awt.*; import java.util.Random; import javax.swing.*; import javax.swing.border.TitledBorder; /*** 7. * 随机画出两个圆，判断它们是否相交 8. * @author Firklaag 9. * @ver 0.01 10. * 编写代码实现同一平面内两圆是否碰撞，其中：第一个圆圆心坐标为(x1,y1)，半径是r1，第二个圆圆心坐标为(x2,y2)，半径是r2，数据结构自定义。 11. */ public class CheckCircul extends JFrame { //定义画布 private MyPanel myPanel = new MyPanel(); public CheckCircul() { add(myPanel); } public static void main(String[] args) { CheckCircul demo = new CheckCircul(); run(demo, 800, 700); } /* * 运行辅助方法 */ public static void run(final JFrame f, final int width, final int height) { SwingUtilities.invokeLater(new Runnable() { public void run() { f.setTitle(f.getClass().getSimpleName()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setSize(width, height); f.setVisible(true); } }); } } /* 40. * 画布类 41. */ class MyPanel extends JPanel { //定义标签 private JLabel label = new JLabel(); //定义随机数 private Random ran = new Random(); //定义两个圆 private Circul tom; private Circul jerry; /** 52. * 生成两个圆并增加标签到画布 53. */ public MyPanel() { tom = new Circul(ran.nextInt(300), ran.nextInt(300), ran.nextInt(400)); jerry = new Circul(ran.nextInt(300), ran.nextInt(300), ran.nextInt(400)); this.setBorder(new TitledBorder("CheckCircul")); add(label); } @Override protected void paintComponent(Graphics g) { //画出两个圆 Rectangle rec1 = tom.draw(g); Rectangle rec2 = jerry.draw(g); //判断其是否相交 if (rec1.intersects(rec2)) { label.setText("相交"); } else { label.setText("不相交"); } } } /** 76. * 定义圆形类，类中不仅有圆的属性，还有画圆的方法 77. */ class Circul { private int x; private int y; private int r; public Circul(int x, int y, int r) { this.x = x; this.y = y; this.r = r; } public Rectangle draw(Graphics g) { Graphics2D g2d = (Graphics2D) g.create(); //调用抗锯齿API g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.drawOval(x, y, r, r); return new Rectangle(x, y, r, r); } public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } public int getR() { return r; } public void setR(int r) { this.r = r; } } 3 楼 jorneyR 2010-11-26 判断两圆心距离与两圆的半径之和就可以了 4 楼 realcbb 2010-11-26 jorneyR 写道判断两圆心距离与两圆的半径之和就可以了