Button - OpenProcessing

mySketch
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int w = 400;
int x = 400;  
int y = 200;
int z = 50;
int zz = 0;
​
void setup () {
size (800, 800);
​
}
​
void draw () {
background (#91dcf7);
rect(w,x,y,z);
​
if (zz == 1) {
rect (100,200, 30, 30);
fill (#215007);
if (mousePressed)
fill (#083051);
}
}
​
void mousePressed () {
​
  if ((mouseY < (x+z)) && (mouseY > (x))) {
  if ((mouseX < (w+y)) && (mouseX > (x))) {
  zz = 1;
  }
  }
}