Java分形绘制山脉模型代码示例

本篇文章小编给大家分享一下Java分形绘制山脉模型代码示例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

构思设计

任意选取三个点，选取一个范围和一个比率，每一个都对这三个点取中点，中点的纵坐标加一个在范围内的随机值，当完成一次递归之后缩小这个范围即range*rate 连线的时候，将三角形的一个点和这个点的两条边生成的中点相连，最后将三条边的中点相连 所以应该有四个递归调用。

代码实现及注解

package Mountion;

import java.awt.Graphics;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import javax.swing.JFrame;

public class ShowUI {
    List list=new ArrayList<>();
    int i=0;
    public void divide(int x1,int x2,int x3,int y1,int y2,int y3,int range,double rate,int times,Graphics g,Shape p){
        if(times==0){
            //画线，构成一个三角形
            g.drawLine(x1, y1, x2, y2);
            g.drawLine(x3, y3, x2, y2);
            g.drawLine(x1, y1, x3, y3);
            return ;
        }
        else{
            times--;
            Random rand=new Random();
            //注意数据需要初始化
            int x4=0,x5=0,x6=0,y4=0,y5=0,y6=0;
            int flag1=0,flag2=0,flag3=0;
            //遍历这个表
            for(Shape s : list) {
                //相等的两种状况
                if((s.pX1()==x1&&s.pX2()==x2&&s.pY1()==y1&&s.pY2()==y2)||(s.pX1()==x2&&s.pX2()==x1&&s.pY1()==y2&&s.pY2()==y1)){
                    if(s.show(g)==1){
                        //如果这个边已经被使用过了，那么此时说明中点已经生成，只需要读出来中点即可
                        x4=s.pX3();
                        y4=s.pY3();
                        //System.out.println(times+":same:==================size:"+(i++));
                    }
                    else{
                        //如果这条边存在但没有使用,那么生成这个中点，进行更新，其实就是将原来的shape删除掉，加入一个新的。
                        x4=(x1+x2)/2;
                        y4=(y1+y2)/2+rand.nextInt(range*2)-range;
                        //System.out.println(times+"：1");
                        list.remove(s);
                        p =new Shape(x1,x2,x4,y1,y2,y4,1);
                        list.add(p);
                    }
                    flag1=1;
                    break;
                }
                
                
                
            }
            if(flag1==0){
                //System.out.println(times+":before:==================size:"+(i++));
                //如果不存在，这个很简单，只需要构造一个就好了
                x4=(x1+x2)/2;
                y4=(y1+y2)/2+rand.nextInt(range*2)-range;
                p =new Shape(x1,x2,x4,y1,y2,y4,1);
                list.add(p);
            }
            //后面两种情况类似
            for(Shape s : list) {
                if((s.pX1()==x1&&s.pX2()==x3&&s.pY1()==y1&&s.pY2()==y3)||(s.pX1()==x3&&s.pX2()==x1&&s.pY1()==y3&&s.pY2()==y1)){
                    if(s.show(g)==1){
                        x5=s.pX3();
                        y5=s.pY3();
                    }
                    else{
                        x5=(x1+x3)/2;
                        y5=(y1+y3)/2+rand.nextInt(range*2)-range;
                        list.remove(s);
                        p =new Shape(x1,x3,x5,y1,y3,y5,1);
                        list.add(p);
                    }
                    flag2=1;
                    break;
                }
            }
            if(flag2==0){
                x5=(x1+x3)/2;
                y5=(y1+y3)/2+rand.nextInt(range*2)-range;
                //System.out.println(times+":before1:==================size:"+(i++));
                p =new Shape(x1,x2,x4,y1,y2,y4,1);
                list.add(p);
            }
            for(Shape s : list){
                if((s.pX1()==x2&&s.pX2()==x3&&s.pY1()==y2&&s.pY2()==y3)||(s.pX1()==x3&&s.pX2()==x2&&s.pY1()==y3&&s.pY2()==y2)){
                    if(s.show(g)==1){
                        x6=s.pX3();
                        y6=s.pY3();
                    }
                    else{
                        x6=(x2+x3)/2;
                        y6=(y2+y3)/2+rand.nextInt(range*2)-range;
                        list.remove(s);
                        p =new Shape(x2,x3,x6,y2,y3,y6,1);
                        list.add(p);
                    }
                    flag3=1;
                    break;
                }
            }
            if(flag3==0){
                x6=(x2+x3)/2;
                y6=(y2+y3)/2+rand.nextInt(range*2)-range;
                //System.out.println(times+":before2:==================size:"+(i++));
                p =new Shape(x1,x2,x4,y1,y2,y4,1);
                list.add(p);
            }
            //逐渐缩小范围
            range=(int)(range*rate);
            //将边添加进行，类似一个初始话，标记位为0
            p =new Shape(x1,x4,y1,y4,0);
            list.add(p);
            p =new Shape(x1,x5,y1,y5,0);
            list.add(p);
            p =new Shape(x4,x5,y4,y5,0);
            list.add(p);
            p =new Shape(x2,x4,y2,y4,0);
            list.add(p);
            p =new Shape(x2,x6,y2,y6,0);
            list.add(p);
            p =new Shape(x4,x6,y4,y6,0);
            list.add(p);
            p =new Shape(x3,x5,y3,y5,0);
            list.add(p);
            p =new Shape(x3,x6,y3,y6,0);
            list.add(p);
            p =new Shape(x5,x6,y5,y6,0);
            list.add(p);
            //画四个三角形
            divide(x1,x4,x5,y1,y4,y5,range,rate,times,g,p);
            divide(x2,x4,x6,y2,y4,y6,range,rate,times,g,p);
            
            divide(x3,x5,x6,y3,y5,y6,range,rate,times,g,p);
            divide(x4,x5,x6,y4,y5,y6,range,rate,times,g,p);
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JFrame moun=new JFrame();
        moun.setSize(1000, 600);
        moun.setLocationRelativeTo(null);
        moun.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        moun.setVisible(true);
        Graphics g=moun.getGraphics();//获取窗体
        int x1=500,x2=100,x3=850;
        int y1=100,y2=400,y3=400;
        int range=200;
        double rate=0.5;
        int times=7;
        ShowUI a=new ShowUI();
        try {
            Thread.sleep(566);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Shape p = null;
        //System.out.println(100);
        a.divide(x1, x2, x3, y1, y2, y3, range, rate,times,g,p);

    }

}

Shape类

package Mountion;

import java.awt.Graphics;

public class Shape {
    private int x1,x2,x3,y1,y2,y3;
    private int flag;
    //这个构造函数存储的是一个边的两个点，以及这个边生成的中点
    public Shape(int x1,int x2,int x3,int y1,int y2,int y3,int flag){
        this.x1=x1;
        this.x2=x2;
        this.x3=x3;
        this.y1=y1;
        this.y2=y2;
        this.y3=y3;
        this.flag=flag;
    }
//这个构造函数存储的一条边的两个点
    public Shape(int x1,int x2,int y1,int y2,int flag){
        this.x1=x1;
        this.x2=x2;
        this.y1=y1;
        this.y2=y2;
        this.flag=flag;
    }
    //flag标记位，这条边是否被使用过
    public int show(Graphics g) {
        // TODO Auto-generated method stub
        return flag;
    }
    public int pX1(){
        return x1;
    }
    public int pX2(){
        return x2;
    }
    public int pX3(){
        return x3;
    }
    public int pY1(){
        return y1;
    }
    public int pY2(){
        return y2;
    }
    public int pY3(){
        return y3;
    }
}

效果展示