p5.js mouseMoved() Function

The mouseMoved() function in p5.js is called every time the mouse moves and a mouse button is not pressed.

Syntax:

mouseMoved(Event)

Parameters: This function accepts single parameter Event which is optional.

Below programs illustrate the mouseMoved() function in p5.js:
Example 1: This example uses mouseMoved() function change the rectangle color when mouse move over.

function setup() {

    // Create Canvas of size 500*500
    createCanvas(500, 500);
}

let value = 0;
function draw() {

    // SEt background color
    background(200);

    // Set the filled color
    fill(value);

    // Create rectangle of given size
    rect(25, 25, 460, 440);

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

    // Set font size
    textSize(15);

    // Display the text
    text('Move Mouse Across the page to change its value.',
             windowHeight/6, windowWidth/4);
}

function mouseMoved() {

    value = value + 5;

    if (value > 255) {
        value = 0;
    }
}

Output:

Example 2: This example uses mouseMoved() function change the color of ellipse.

// Declare a variable
let value;

function setup() {

    // Create Canvas of size 500*500
    createCanvas(500, 500);
}

function draw() {

    // Set background color
    background(200);

    // fill color according to
    // mouseMoved() function

    // Set the color
    fill(value, value, value);

    // Draw ellipse
    ellipse(mouseX, mouseY, 115, 115);
}

function mouseMoved() {
    value = mouseX%255;
}

Output:

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