p5.js rotationZ Event

The system variable rotationZ in p5.js is responsible for the rotation of mobile devices (smartphones and tablets) always along the z-axis. It can be used in the draw() function to continuously get the current rotation along the z-axis. If the graphics angleMode() is set to DEGREES, then the value will be in the range of 0 to 360. When it is set to RADIANS, the value will be 0 to 2*PI. This variable is only available for devices with a built-in compass.

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:

rotationZ

Example 1:

Javascript

// Rotate the device to see the box move
function setup() {
  createCanvas(600, 600, WEBGL);
}

function draw() {
  background(2);

  // Set the rotation to be equal to
  // the variable rotationZ
  rotateZ(radians(rotationZ));

  fill("blue");
  box(200, 200, 200);
}

Output:

Example 2:

Javascript

function setup() {
  createCanvas(600, 600, WEBGL);
}

function draw() {
  background(205, 105, 94);

  // Set the rotation to be equal to
  // the variable rotationZ
  rotateZ(radians(rotationZ));

  fill('green');
  cylinder(100, 200);
}

Output: