var y = 375

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

​

  circle(x,y,50)

 if (mouseX < x + 25 && mouseX > x - 25 && mouseY < y + 25 && mouseY > y - 25 ) {

   if (mouseIsPressed) {

   x = mouseX

   y = mouseY

 }

 }

​

}