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p5.js | cos() function

  • Last Updated : 17 Apr, 2019

The cos() function in p5.js is used to calculate the cosine value of an angle (taken in radian) as input parameter of the function and returns the result between -1 to 1.


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Parameters: This function accepts a single parameter angle which is an angle in radian whose cosine value to be calculated.

Return Value: It returns the cosine value of an angle in radian taken as the input parameter.

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

Example: This example uses cos() function to get cosine value of an angle in radian.

function setup() { 
    // Create Canvas of given size
    createCanvas(550, 130); 
function draw() { 
    // Set the background color 
    // Initialize the parameter with
    // angles in radian only
    let a = 0; 
    let b = 8.9; 
    let c = 47;
    let d = 5;
    // Call to cos() function 
    let v = cos(a);
    let w = cos(b);
    let x = cos(c);
    let y = cos(d);
    // Set the size of text 
    // Set the text color 
    // Getting cosine value 
    text("Cosine value of angle 0 (in radian) is : " + v, 50, 30);
    text("Cosine value of angle 8.9 (in radian) is : " + w, 50, 50);
    text("Cosine value of angle 47 (in radian) is : " + x, 50, 70);
    text("Cosine value of angle 5 (in radian) is : " + y, 50, 90);     


Note: In the above code, the input angle should be in radian. For converting degree angle into radian we can use the following formula:

Angles_in_radian = (π/180)*angles_in_degree


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