p5.js | Mouse | mouseIsPressed

The mouseIsPressed system variable in p5.js is used to store the boolean value. If mouse is pressed then it stores True otherwise store False.

Syntax:

mouseIsPressed

Below programs illustrate the mouseIsPressed variable in p5.js:

Example 1: This example uses mouseIsPressed variable to check mouse is press or not.

function setup() {

    // Create canvas of given size
    createCanvas(500, 250);

    // Set the text size
    textSize(30);
}

function draw() {

    // Set the background color
    background('green');

    fill('white');

    // If mouse is pressed then if part will
    // execute otherwise else part will execute
    if (mouseIsPressed) {
        text("Mouse is Pressed", 120, 100);
    }
    else {
        text("Mouse is Released", 120, 100);
    }
}

Output:

Example 2:

function setup() {

    // Create Canvas of given size
    createCanvas(300, 150);
}

function draw() {

    // Set the background color
    background('green');

    fill('white');

    // Use mouseIsPressed variable
    if (mouseIsPressed) {
        ellipse(50, 50, 50, 50);
    }
    else {
        rect(25, 25, 50, 50);
    }
}

Output:

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