cloud.java

用java实现分形云的算法,直接运行即可得到分形云,无需任何修改

import java.applet.Applet;
import java.awt.*;
public class cloud extends Applet{
    Image Buffer;
    Graphics Context;
    
    float Displace(float num){
        float max=num/(float)(getSize().width+getSize().height)*3;
        return ((float )Math.random()-0.5f)*max;
    }
    Color ComputeColor(float c){
        float Red=0;
        float Green=0;
        float Blue=0;
        
        if(c<0.5f){
            Red=c*2;
        }else{
            Red=(1.0f-c)*2;
        }
        
        if(c>=0.3f&&c<0.8f){
            Green=(c-0.3f)*2;
        }else if(c<0.3f){
            Green=(0.3f-c)*2;
        }else{
            Green=(1.3f-c)*2;
        }
        
        if(c>=0.5f){
            Blue=(c-0.5f)*2;
        }else{
            Blue=(0.5f-c)*2;
        }
        return new Color(Red,Green,Blue);
    }
    void drawcloud(Graphics g,int width,int height){
        float r1,r2,r3,r4;
        r1=(float)Math.random();
        r2=(float)Math.random();
        r3=(float)Math.random();
        r4=(float)Math.random();
        Midpoint(g,0,0,width,height,r1,r2,r3,r4);
    }
    void Midpoint(Graphics g,float x,float y,float width,float height,float r1,float r2,float r3,float r4){
        float M1,M2,M3,M4,Middle;
        float newWidth=width/2;
        float newHeight=height/2;
        
        if(width>2||height>2){
            Middle=(r1+r2+r3+r4)/4+Displace(newWidth+newHeight);
            M1=(r1+r2)/2;
            M2=(r2+r3)/2;
            M3=(r3+r4)/2;
            M4=(r4+r1)/2;
            
            if(Middle<0){
                Middle=0;
            }else if(Middle>1.0f){
                Middle=1.0f;
            }
            Midpoint(g,x,y,newWidth,newHeight,r1,M1,Middle,M4);
            Midpoint(g,x+newWidth,y,newWidth,newHeight,M1,r2,M2,Middle);
            Midpoint(g,x+newWidth,y+newHeight,newWidth,newHeight,Middle,M2,r3,M3);
            Midpoint(g,x,y+newHeight,newWidth,newHeight,M4,Middle,M3,r4);
        }else{
            float c=(r1+r2+r3+r4)/4;
            g.setColor(ComputeColor(c));
            g.drawRect((int)x,(int)y,1,1);
        }
    }
    public boolean mouseUp(Event evt,int x,int y){
        drawcloud(Context,getSize().width,getSize().height);
        repaint();
        return false;
    }
    public void paint(Graphics g){
        g.drawImage(Buffer,0,0,this);
    }
    public void init(){
        Buffer=createImage(getSize().width,getSize().height);
        Context=Buffer.getGraphics();
        drawcloud(Context,getSize().width,getSize().height);
       
    }
    
}
/*
 * <applet code=cloud width=200 height=200>
 * </applet>
 */