Processing Mouse Envents

mouseClickInBounds.pde

int rectSize = 100;
float rectX ;
float rectY;

void setup() {
  size(400,400);
  background(250);
  rectX = width* 0.4;
  rectY = height * 0.4;
}

void draw() {
  fill(99);
  rect(rectX, rectY, rectSize, rectSize);
  
}

void mousePressed() {
  if((mouseX > rectX && mouseX < (rectX + rectSize)) && 
    (mouseY > rectY && mouseY < (rectY + rectSize))){
      println("Clicked within the square. MouseX: " + mouseX + " - MouseY: " + mouseY);
  } else {
    println("You've crossed your boundaries, how dare you?");
  }
}