Java绘制山脉模型
暖男小王子 人气:0如何绘制一个山脉
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<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){
//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
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