p5.js mouseMoved() Function

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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

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