/*
  Sketch that uses conditional to determine whether a mouse press
  lies within a rectangle. If so, the rectangle is recolored. Otherwise,
  the mouse press is ignored.
  
  Author: Michael Goldwasser
*/
float left, right, top, bottom;    // parameters for rectangle boundaries

void setup() {
  size(500, 400);
  
  left = 0.25*width;
  right = 0.75*width;
  top = 0.25*height;
  bottom = 0.75*height;
  drawRectangleRandomly();
}

void drawRectangleRandomly() {
  fill(random(255), random(255), random(255));
  rect(left, top, right-left, bottom-top);
}

void draw() {
  // nothing to do here
}

void mousePressed() {
  // We use "&&" operator to enforce "and" of all conditions
  if (left <= mouseX && mouseX <= right &&
      top <= mouseY && mouseY <= bottom) {
    // click is within rectangle
    drawRectangleRandomly();
  }
}