// example of rollover testing along with custom function

void setup() {
  size(500, 500);
  smooth();
  background(255);
  frameRate(30);
}
//our custom function for making rectangles - note we draw the rectangles from the center
void drawrect(int x, int y, float scaled){
  pushMatrix();
  fill(0);
  translate(x, y);
  scale(scaled);
  rectMode(CENTER);
  rect(0, 0, 5, 5);
  popMatrix();
}

void draw() {
  fill(255);
  rect(width/2, height/2, width, height);
  for(int i = 10; i < width; i += 20){
    for(int j = 10; j < height; j += 20){
      //if(dist(mouseX, mouseY, i, j) < 15){  //this is the test method for round objects
        if(mouseX > i-10 && mouseX < i+10 && mouseY > j-10 && mouseY < j+10) {  //this is the method for rectangular objects draw from the center
        drawrect(i, j, 3);  //scale *3 if hit test is true
      } 
      else {
        drawrect(i, j, 1);  //scale *1 if not
      }
    }
  }
}