p5.js atan() Function

The atan() function in p5.js is used to calculate the inverse of tan() or arc tangent of a value ranging in between -Infinity to Infinity (exclusive) and gives result in the range of -π/2 to π/2.

Syntax:

atan(P)

Parameters: This function accepts a parameter “P” which is a value ranging from -1 to 1 and whose arc tangent is calculated.

Return Value: It returns the arc tangent of a value and its range is in between -π/2 to π/2.

Below program illustrates the atan() function in p5.js:

Example: This example uses atan() function to get arc tangent of a value.

function setup() {

    // Create Canvas of size 270*80
    createCanvas(550, 130);
}

function draw() {

    // Set the background color
    background(220);

    // Initialize the parameter with some values
    let a = 0;
    let b = 88;
        let c = -1;
        let d = -0.5;
        let e = 5;

    // Call to atan() function
    let v = atan(a);
        let w = atan(b);
        let x = atan(c);
        let y = atan(d);
        let z = atan(e);

    // Set the size of text
    textSize(16);

    // Set the text color
    fill(color('red'));

    // Getting arc tangent value
    text("Arc tangent value of 0 is : " + v, 50, 30);
        text("Arc tangent value of 88 is : " + w, 50, 50);
        text("Arc tangent value of -1 is : " + x, 50, 70);
        text("Arc tangent value of -0.5 is : " + y, 50, 90);
        text("Arc tangent value of 5 is : " + z, 50, 110);
}

Output:

Reference: https://p5js.org/reference/#/p5/atan