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int x = 150;
void setup (){
size(500,500);
background(0);
}
void draw() {
fill(x);
rectMode(CENTER); //square in middle
rect(250, 250, 100, 100);
}
void mousePressed() {
if (x == 150) { //if pressed then will cnage colors
x = 255;
}
else {
x = 150; //not pressed, stays the same
}
}