createCanvas(400, 400);

}

​

//button callback example

var hit = false;

​

function setup() {

    createCanvas(400,400);

  background("#EEEEEE");

}

​

function draw(){

    noStroke();

    rect(100,200,100,100);

​

    hit = collidePointRect(mouseX,mouseY,100,200,100,100); //see if the mouse is in the rect

​

    if(hit){ //change color!

        fill('Tomato')

    }else{

        fill('orange')

    }

}