dotfour.java

用JAVA写个一个烟花效果

package FireFlower;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;
import java.util.Vector;

//此式样是计算重力的式样
class  DotFour  extends Dot{

   public DotFour(Color col,int endX,int endY){
	   super(col, endX, endY);
       pace=20;
      
   }

  
   public LittleDot[] initBlast(){
      //初始化爆炸的情况

	final  int  ONE=20;//这是爆炸的第一圈的半径 
      Random   rand=new Random();
      int  blastX=endPoint.x-ONE*circle;
	  int  blastY=endPoint.y-ONE*circle;
	  
	  if(Math.random()<0.3){
	  for(int i=0;i<ld.length;i++){
	      ld[i]=new LittleDot(rand.nextInt(ONE*circle*2)+blastX,
	    		              rand.nextInt(ONE*circle*2)+blastY,
			  new Color(rand.nextInt(256),rand.nextInt(256),rand.nextInt(256)));
	    	//设置该点的速度
	      
	      ld[i].setPace(WALLOP,endPoint.x,endPoint.y);	
	  }//for
	  
	  
	  }//if
	  
	  else  {
		  for(int i=0;i<ld.length;i++){
		      ld[i]=new LittleDot(rand.nextInt(ONE*circle*2)+blastX,
		    		              rand.nextInt(ONE*circle*2)+blastY,
				                     col);
		      ld[i].setPace(WALLOP,endPoint.x,endPoint.y);	               
		  }//for
		  
	  }//else
	 
	//  col=new Color(225,203,114);
	  size=10;
     state=3;
    return ld; 

   }

   
   
   public  LittleDot[]   blast(){
	   
	   //处理爆炸的情况
       final  int  EVERY=40;//爆炸的每圈的半径 
      Random   rand=new Random();
      
      if(circle<=3){
    	  for(int i=0;i<ld.length;i++){
			  
    		  //前三圈按照下面的代码来计算爆炸点的碎花的位置
    			ld[i].setPlace();
    
      }//for
      }//if
      
    else{
    	
	         for(int i=0;i<ld.length;i++){
		      //三圈后就碎花就开始下坠
	 
			  ld[i].setPace(ld[i].horizontal,GRAVITY);
			  ld[i].setPlace();
                                  }
		
    	  }//else 
      
	  return ld;
   }

   public void myPaint(Graphics g,Vector lList){
	   
	   super.myPaint(g,lList);
	 /*  
	   if(state==3){
			g.setColor(col);
	      	g.fillOval(x,y+circle*2,size,size);
		   }
		   */
	   }    
   
   }