分形树，递归研究
package com.test;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
/** * * @author http://javaflex.iteye.com/ * */
public class GraphicsTest extends JFrame implements ActionListener
{ public static final double PI = Math.PI / 180;
JPanel panel;
JPanel pnlCtl;
JButton button;
JButton button2;
Graphics2D g2;
public GraphicsTest(String string){
super(string);
}
public void init(){
panel = new JPanel();
pnlCtl = new JPanel();
button = new JButton("分形树");
button2 = new JButton("清除");
this.add(panel, BorderLayout.CENTER);
button.addActionListener(this);
button2.addActionListener(this);
pnlCtl.add(button);
pnlCtl.add(button2);
this.add(pnlCtl, BorderLayout.NORTH);
setSize(800, 600);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
Dimension winSize = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation((winSize.width - this.getWidth()) / 2,
(winSize.height - this.getHeight()) / 2);
g2 = (Graphics2D) panel.getGraphics();
}
public static void main(String[] args) throws ClassNotFoundException,
InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
GraphicsTest testPanel = new GraphicsTest("分形树：QQ：三2824七676");
testPanel.init();
}
@Override
public void actionPerformed(ActionEvent e) {
if ("分形树".equals(e.getActionCommand())) {
drawLeaf(g2, 400, 500, 100, 210+random.nextInt(100));
}
else if ("清除".equals(e.getActionCommand())) {
panel.getGraphics().clearRect(0, 0, 800, 800);
}
}
Random random=new Random();
public void drawLeaf(Graphics g, double x, double y, double L, double a) {
//random=new Random(); //可以方面速度画以了解其算法 //
/*try { //
Thread.sleep(1000); //
} catch (InterruptedException e) {
// // TODO Auto-generated catch block //
e.printStackTrace(); //
} */
int red = random.nextInt(127);
int green = random.nextInt(127);
int blue = random.nextInt(127);
//随机颜色
g.setColor(new Color(red, green, blue));
double x1, x2, x1L, x2L, x2R, x1R, y1, y2, y1L, y2L, y2R, y1R;
float deflection = 50-random.nextInt(20);
//侧干主干的夹角
float intersection = random.nextInt(40)-20;
//主干偏转角度
float depth = 2+random.nextInt(2);
//限制递归深度
float ratio = 3f;
//主干侧干长度比(可调整使其更茂密或稀疏)
float ratio2 = 1.2f;
//上级主干与本级主干长度比（可调整使其变高低）
if (L > depth) {
x2=x+L*Math.cos(a*PI);
y2=y+L*Math.sin(a*PI);
x2R=x2+L/ratio*Math.cos((a+deflection)*PI);
y2R=y2+L/ratio*Math.sin((a+deflection)*PI);
x2L=x2+L/ratio*Math.cos((a-deflection)*PI);
y2L=y2+L/ratio*Math.sin((a-deflection)*PI);
x1=x+L/ratio*Math.cos(a*PI);
y1=y+L/ratio*Math.sin(a*PI);
x1L=x1+L/ratio*Math.cos((a-deflection)*PI);
y1L=y1+L/ratio*Math.sin((a-deflection)*PI);
x1R=x1+L/ratio*Math.cos((a+deflection)*PI);
y1R=y1+L/ratio*Math.sin((a+deflection)*PI);
g.drawLine((int)x,(int)y,(int)x2,(int)y2);
g.drawLine((int)x2,(int)y2,(int)x2R,(int)y2R);
g.drawLine((int)x2,(int)y2,(int)x2L,(int)y2L);
g.drawLine((int)x1,(int)y1,(int)x1L,(int)y1L);
g.drawLine((int)x1,(int)y1,(int)x1R,(int)y1R);
drawLeaf(g,x2,y2,L/ratio2,a+intersection);
drawLeaf(g,x2R,y2R,L/ratio,a+deflection);
drawLeaf(g,x2L,y2L,L/ratio,a-deflection);
drawLeaf(g,x1L,y1L,L/ratio,a-deflection);
drawLeaf(g,x1R,y1R,L/ratio,a+deflection);
}
}
}