p5.js rotationY Event

The system variable rotationY in p5.js is responsible for the rotation of mobile devices (smartphones and tablets) always along the y-axis. It can be used in the draw() function to continuously get the current rotation along the y-axis. If the graphics angleMode() is set to DEGREES, then the value will be in the range of -90 to 90. When it is set to RADIANS, the value will be between -PI/2 to PI/2.

Note: The order the rotations are called is important if all the three variables are used together. It is required to call them in the order Z, Y, and X to prevent inconsistencies.

Syntax:

rotationY

Example 1:

Javascript

// Rotate the device at 90 degree.
function setup() {
  createCanvas(600, 600, WEBGL);
}

function draw() {
  background(2);

  // Set the rotation to be equal to
  // the variable rotationY
  rotateY(radians(rotationY));

  fill('red');
  box(200, 200, 200);
}

Output:

Example 2:

Javascript

// Rotate the device at  0 to 360 degree.
function setup() {
  createCanvas(600, 600, WEBGL);
}

function draw() {
  background(205, 105, 194);

  // Set the rotation to be equal to
  // the variable rotationY
  rotateY(radians(rotationY));

  fill('orange');
  sphere(140);
}

Output: