createCanvas(600, 600);

}

​

function draw() {

  clear();

​

  let padding = 100;

​

  let v1 = createVector(0 + padding,0 + padding);

  let v2 = createVector(width-padding,0 + padding);

  let v3 = createVector(width-padding,height-padding)

  let v4 = createVector(0 + padding, height-padding);

​

  stroke('black');

  noFill();

​

  // fill(mouseY);

  triangle(v1.x, v1.y, v2.x, v2.y, mouseX, mouseY);

​

  // fill(width-mouseX);

  triangle(v2.x, v2.y, v3.x, v3.y, mouseX, mouseY);

​

  // fill(height-mouseY);

  triangle(v3.x, v3.y, v4.x, v4.y, mouseX, mouseY);

​

  // fill(mouseX);

  triangle(v4.x, v4.y, v1.x, v1.y, mouseX, mouseY);

}