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p5.js | atan() Function

  • Last Updated : 06 Sep, 2019

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.


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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 
    // 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 
    // Set the text color 
    // 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);     



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