//set up variables 
int NUM=20; 
int[] x1 = new int[NUM]; 
int[] y1 = new int[NUM]; 
int[] x1old = new int[NUM]; 
int[] y1old = new int[NUM]; 
int x1new; 
int y1new; 


void setup() { 
  size (200,200); 

  for (int i=0; i<NUM; i++){ 
   x1[i]=int(random(20,width-20)); 
   y1[i]=int(random(5,height-5)); 
   x1old[i]=x1[i]; 
   y1old[i]=y1[i]; 
   } 
   
} 
 
void draw() { 
  background(255); 
 
  //draw arrows 
  for(int i=0; i<NUM; i++) { 
    pushMatrix(); 
    translate(x1[i],y1[i]); 
    rotate(radians(360)/NUM*i); 
    line(-20,0,0,0); 
    line(0,0,-5,-5); 
    line(0,0,-5,+5); 
    popMatrix(); 
  } 
   
  //translate when mouse pressed 
    if (mousePressed) { 

     x1new=mouseX; 
     y1new=mouseY; 
     
 for (int i=0;i<NUM;i++) { 
   if (y1new>y1[i]) { 
     y1[i]++; 
   } 
   if (y1new<y1[i]) { 
     y1[i]--; 
   } 
   if (x1new>x1[i]) { 
     x1[i]++; 
   } 
   if (x1new<x1[i]) { 
     x1[i]--; 
   } 
 } 
    } 
  //snap back to position when mouse is relased *below* is triggered 
 else { 
    for (int i=0;i<NUM;i++) { 
 if (y1old[i]>y1[i]) { 
   y1[i]++; 
 } 
 if (y1old[i]<y1[i]) { 
   y1[i]--; 
 } 
 if (x1old[i]>x1[i]) { 
   x1[i]++; 
 } 
 if (x1old[i]<x1[i]) { 
   x1[i]--; 
 } 
    } 
  } 
} 
 
void mouseReleased() { 
  
  for (int i=0; i<NUM; i++){ 
    x1old[i]=int(random(20,width-20)); 
    y1old[i]=int(random(5,height-5)); 
    } 
}