Square Mouse Press - OpenProcessing

mySketch
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/*----------------------------- 
A square that is interactable
29 Jan 2017
Nicholas Nowak
jedinick@msn.com
Class 3001 8:10 AM Tues, Thurs
-----------------------------*/
​
boolean mouseIsDown = false;
​
void setup() {
  size(500,500);
  background(255);
  fill(255,0,0);
  rect(200,200,100,100);
}
​
void mousePressed() {
  mouseIsDown = true;
  fill(0,255,0);
  rect(100,100,100,100);
}
void mouseReleased() {
  mouseIsDown = false;
  fill(0);
  rect(100,100,100,100);
}