p5.js angleMode() Function

The angleMode() function in p5.js is used to set the mode in which the angle is interpreted. It can be set to either degrees or radians. All the functions that use an angle as a parameter would follow the angle mode set by this function.

Syntax:

angleMode( mode )

Parameters: This function accept a single parameter as mentioned above and described below: 

• mode: It is a constant that can be used to set the mode in which the angle would be interpreted. It can have the values of DEGREES or RADIANS.

The example below illustrates the angleMode() function in p5.js:
Example:

javascript

let angleModeSelected;

function setup() {
  createCanvas(400, 300);
  textSize(18);

  // Set the default angle to DEGREES
  angleModeSelected = DEGREES;

  // Create a button for toggling the angle mode
  angleModeToggler = createButton("Toggle Angle Mode");
  angleModeToggler.position(30, 40);
  angleModeToggler.mouseClicked(() => {
    if (angleModeSelected == DEGREES) angleModeSelected = RADIANS;
    else angleModeSelected = DEGREES;
  });

  // Create a slider for changing the current angle
  angleSlider = createSlider(-180, 180, 0, 1);
  angleSlider.position(30, 120);
}

function draw() {
  clear();

  // Get the angle from the slider
  let angleToRotate = angleSlider.value();

  // Convert the angle to radians
  // for demonstration
  let angleInRadians = (angleToRotate / 57.295).toFixed(3);

  text("Angle Mode Selected: " + angleModeSelected, 20, 20);
  text("Current value of rotation: " + angleToRotate + " degrees", 20, 80);
  text("Current value of rotation: " + angleInRadians + " radians", 20, 100);

  // Set the angle mode
  // based on the selected mode
  angleMode(angleModeSelected);

  translate(width / 3, height / 1.5);

  // Rotate the shape according to
  // the angle specified
  rotate(angleToRotate);

  // Draw the rectangle that
  // would be rotated
  rect(0, 0, 100, 25);
}

Output:

Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/amp/
Reference: https://p5js.org/reference/#/p5/angleMode