p5.js | createCheckbox() Function

The createCheckbox() function in p5.js is used to create a checkbox element in the DOM (Document Object Model). This function includes the p5.dom library. Add the following syntax in the head section.

html

<script src=
"https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/addons/p5.dom.min.js">
</script>

Syntax:

createCheckbox(label, value)

Parameters:

• label: This parameter holds the label displayed beside the checkbox.
• value: This parameter holds the state of the checkbox (true/false).

Example: This example uses a checkbox to change the background color from light to dark and vice-versa. 

javascript

// Create a variable for checkbox object
var checkbox;

// Create a function to change the background-color
function change_bg() {
    // Set dark color if box is checked
    if (this.checked()) {
        background("darkgreen");
    }
    // Set light color if box is unchecked
    else {
        background("lightgreen");
    }
}

function setup() {
    // Create a canvas
    createCanvas(400, 400);
    // Set the background-color
    background("lightgreen");
    // Create a checkbox object
    // Initially unchecked
    checkbox = createCheckbox('Dark Background', false);
    // Position the checkbox object
    checkbox.position(160, 200);
    // Call the change_bg() function when the box
    // is checked or unchecked
    checkbox.changed(change_bg);
}

Output:
Before checking the box:

After checking the box:

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