float dx,dy,delta;
int space=10;
myObj[][]objArray;

int x1, y1, x2, y2;

void setup(){
  size(200,200);
  background(0);
}
void draw(){
  objArray=new myObj[400][400];
  for (int x=0; x<20; x++){
    for (int y=0; y<20; y++){ 
      objArray[x][y]=new myObj((x*space), (y*space)+1);
    }
  }
}
class myObj{
  myObj(int x, int y){
    pushMatrix();
    translate(x, y);

    //create variables for distance formula
    x1 = mouseX;
    y1 = mouseY;
    x2 = x;
    y2 = y;

    dx = x2-x1; // X distance between the two points
    dy = y2-y1; // Y distance between the two points
    delta = sqrt(dx*dx+dy*dy); // math for calculating the distance between two points.

    fill(delta*2);
rotate(atan2(dx, dy));
    rect(0,0, 8,8);
    popMatrix();
  }
  
}