用processing做雨

//PROCESSING 
//draw rain v 0.1 
//LEE 
//processing QQ group : 7726768 

void setup() {
  size(800, 800);//set window size 800 by 800
 background(255);//backgound color is white
 

}

void draw() {//the main function, same as the loop in Arduino code
  
rain(); // call the rain function;
}


void rain()
{
   background(255,100); //use a semitransparent background to renew the window
  
    for(int i =0; i<100; i++)
  {
    float x =random(800); // get a random raindrop's start loction at X axis
    float y =random(800);// get a random raindrop's start loction at Y axis
    float l =random(30);// get a random raindrop's length
    float deg = random(10); // get a random raindrop direction 
    float a = random(100); // get a randow raindrop weight 
    
   stroke(0,a); // set the weight of raindrop
   
   //draw the rain! 
  line(x,y,x+(cos((75.0+deg)/180.0*3.14)*(l+40)), y+sin((75.0+deg)/180.0*3.14)*(l+50));
  
  }
 

}
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