分形之概率学下的green tree

Posted 2020-07-28 夜空中最亮的星

     今天做的是分形之随机概率，可以和以前做的那个抛色子的做法非常相似，抛色子是用随机点数控制图形，今天做的树叶图形只是用概率的做法去控制图形而已，做法是如出一辙的：

//图形界面

package tree0618;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Graphics;

import java.awt.Graphics2D；

import javax.swing.JFrame;

public class treeJF extends JFrame {

public static void main(String[] args) {

treeJF fl=new treeJF(

  fl.initUI();

}

public void initUI(){

getContentPane().setBackground(Color.BLACK);

setTitle("treeFlower");

setSize(600,500);

setDefaultCloseOperation(3);

setLocationRelativeTo(null);

setLayout(new FlowLayout());

setVisible(true);

Graphics g = getGraphics();

((Graphics2D) g).setColor(Color.green);

treeListener tl = new treeListener();

addMouseListener(tl);

tl.setGraphics(g);

}

}

//具体的实现

package tree0618;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.util.Random;

 

public class treeListener implements MouseListener {

float x=0, y=0;

float a, b, c, d, e = 0, f;

private Graphics g;

public Color color;

public int i;

public float x1, y1;

public void setGraphics(Graphics gra) {

g = (Graphics2D) gra;

}

public void mouseClicked(MouseEvent e) {

Random rand = new Random();

for (int i = 0; i < 10000; i++) {

int s = rand.nextInt(100);  //表示总共有100个随机数

if (s < 10) {  //即0-9，表示概率是十分之一

a = 0;b = 0;c = 0;d = (float) 0.16;f = 0;

} else if (s < 18) {  //表示的是10-17，概率为0.18

a = (float) 0.5;b = (float) -0.26;c = (float) 0.23;d = (float) 0.22;f = (float) 1.6;

} else if (s < 26) {  //19-25，表示概率为0.07

a = (float) -0.15;b = (float) 0.28;c = (float) 0.26;d = (float) 0.24;f = (float) 0.14;

} else {  //其他的则为26-100，概率是0.75

a = (float) 0.35;b = (float) 0.04;c = (float) -0.04;d = (float) 0.85;f = (float) 1.6;

}

//图形的运算公式

x1 = a * x + b * y;

y1 = c * x + d * y + f;

x = x1;

y = y1;

//g.drawLine((int)(x1*(-50)+300),(int)(y1*(-50)+400),(int)(x1*(-50)+500),(int)(y1*(-50)+500));这种写法是错误的，注意：随机数表示的是无数个点，所以不是画线是画点

 

g.drawLine((int)(x1*(-50)+300),(int)(y1*(-50)+500),(int)(x1*(-50)+300),(int)(y1*(-50)+500));

}

x=0;

y=0;

}

//对比抛色子：if (i < 4) {

// 画四个点

t = e.getX();

h = e.getY();

g.drawLine(t, h, t, h);

// 分别存储四个点

if (i == 0) {

t1 = t;

h1 = h;

}

 

else if (i == 1) {

t2 = t;

h2 = h;

}

 

else if (i == 2) {

t3 = t;

h3 = h;

}

 

else if (i == 3) {

t4 = t;

h4 = h;

}

i++;

} else {

Random rand = new Random();

for (j = 0; j < 200000; j++) {

int s = rand.nextInt(3);

if (s == 0) {// 如果选中的是A点

t4 = (t1 + t4) / 2;

h4 = (h1 + h4) / 2;

} else if (s == 1) {// 如果选中的是B点

t4 = (t2 + t4) / 2;

h4 = (h2 + h4) / 2;

} else {// 如果选中的是C点

t4 = (t3 + t4) / 2;

h4 = (h3 + h4) / 2;

}

g.drawLine(t4, h4, t4, h4);

i = 0;

}

}

// System.out.println(m+"   "+x);

 

public void mousePressed(MouseEvent e) {

 

}

 

public void mouseReleased(MouseEvent e) {

 

}

 

public void mouseEntered(MouseEvent e) {

}

 

public void mouseExited(MouseEvent e) {

 

}

 

public static void main(String[] args) {

}

 

}

运行结果为：