button - OpenProcessing

mySketch
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int eX;
int eY; 
int eWidth;
int eHeight;
​
boolean isPink = false;
​
void setup () {
  size (300, 300);
  eX = width/2;
  eY = height/2;
  eWidth = 100;
  eHeight = 150;
}
​
void draw () {
  background (66, 134, 244);
  ellipse (eX, eY, eWidth, eHeight);
​
  if (isPink == true) {
    background (244, 66, 220);
    ellipse (eX, eY, eWidth, eHeight);
  } else { 
    background (66, 134, 244);
    ellipse (eX, eY, eWidth, eHeight);
  }
}
​
void mousePressed () {
  if ( dist (eX, eY, mouseX, mouseY) < eWidth/2  && dist (eX, eY, mouseX, mouseY) < eHeight/2 ) {
    if (isPink == true) {
      isPink = false;
    } else { 
      isPink = true;
    }
  }
}
​