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Java分形繪制山脈模型

更新時間：2022年01月10日 13:15:01 作者：暖男小王子

這篇文章主要為大家詳細(xì)介紹了Java分形繪制山脈模型，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了Java分形繪制山脈模型的具體代碼，供大家參考，具體內(nèi)容如下

如何繪制一個山脈

構(gòu)思設(shè)計(jì)

任意選取三個點(diǎn)，選取一個范圍和一個比率，每一個都對這三個點(diǎn)取中點(diǎn)，中點(diǎn)的縱坐標(biāo)加一個在范圍內(nèi)的隨機(jī)值，當(dāng)完成一次遞歸之后縮小這個范圍即range*rate
連線的時候，將三角形的一個點(diǎn)和這個點(diǎn)的兩條邊生成的中點(diǎn)相連，最后將三條邊的中點(diǎn)相連
所以應(yīng)該有四個遞歸調(diào)用。

代碼實(shí)現(xiàn)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<Shape> 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){
?? ??? ??? ?//畫線，構(gòu)成一個三角形
?? ??? ??? ?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();
?? ??? ??? ?//注意數(shù)據(jù)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;
?? ??? ??? ?//遍歷這個表
?? ??? ??? ?for(Shape s : list) {
?? ??? ??? ??? ?//相等的兩種狀況
?? ??? ??? ??? ?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){
?? ??? ??? ??? ??? ??? ?//如果這個邊已經(jīng)被使用過了，那么此時說明中點(diǎn)已經(jīng)生成，只需要讀出來中點(diǎn)即可
?? ??? ??? ??? ??? ??? ?x4=s.pX3();
?? ??? ??? ??? ??? ??? ?y4=s.pY3();
?? ??? ??? ??? ??? ??? ?//System.out.println(times+":same:==================size:"+(i++));
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?else{
?? ??? ??? ??? ??? ??? ?//如果這條邊存在但沒有使用,那么生成這個中點(diǎn)，進(jìn)行更新，其實(shí)就是將原來的shape刪除掉，加入一個新的。
?? ??? ??? ??? ??? ??? ?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，這個很簡單，只需要構(gòu)造一個就好了
?? ??? ??? ??? ?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);
?? ??? ??? ?}
?? ??? ??? ?//后面兩種情況類似
?? ??? ??? ?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);
?? ??? ??? ?}
?? ??? ??? ?//逐漸縮小范圍
?? ??? ??? ?range=(int)(range*rate);
?? ??? ??? ?//將邊添加進(jìn)行，類似一個初始話，標(biāo)記位為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);
?? ??? ??? ?//畫四個三角形
?? ??? ??? ?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();//獲取窗體
?? ??? ?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類

package Mountion;

import java.awt.Graphics;

public class Shape {
?? ?private int x1,x2,x3,y1,y2,y3;
?? ?private int flag;
?? ?//這個構(gòu)造函數(shù)存儲的是一個邊的兩個點(diǎn)，以及這個邊生成的中點(diǎn)
?? ?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;
?? ?}
//這個構(gòu)造函數(shù)存儲的一條邊的兩個點(diǎn)
?? ?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標(biāo)記位，這條邊是否被使用過
?? ?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