​

let angle = 0; // Angle of the spinner.

​

function setup() {

  createCanvas(200, 200);

  // The spinner will have no stroke and filled pink.

  noStroke();

  fill(240, 99, 164);

  // When drawing rectangle, coordinates specify shape's centre.

  rectMode(CENTER); 

  // Not actually required, since RADIANS is default.

  angleMode(RADIANS); 

}

​

function draw() {

  // Clear the canvas purple.

  background(146, 83, 161);

​

  // Draw spinner rotated by current angle around canvas centre.

  translate(width / 2, height / 2);

  rotate(angle);

  rect(0, 0, width * 0.8, height * 0.1);

​

  // Increment the radian angle.

  angle += 0.01;

}

​