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p5.js Keyboard | keyIsPressed
  • Last Updated : 15 Apr, 2019

The keyIsPressed variable in p5.js is true if any key is pressed and false if no keys are pressed.

Syntax:

keyIsPressed

Below program illustrates the keyIsPressed variable in p5.js:
Example-1:




let valueX;
let valueY;
  
function setup() {
    // Create Canvas of size 500*500
    createCanvas(1000, 500);
}
  
function draw() {
    
    // set background color
    background(200);
    fill('green');
    
    // set text and text size
    textSize(25);
    
    text('Press Key to change the figure '+
         'from Circle To Keyboard', 30, 30);
    
    // use of keyIsPressed Variable
    if (keyIsPressed) {
        // draw ellipse  
        ellipse(mouseX, mouseY, 115, 115);
        fill('red');
        text("Key Is Pressed", 100, 300);
    } else {
        rect(mouseX / 2, mouseY / 2, 300, 200);
    }
  
}

Output:
Before:

After:

Example-2:




let valueX;
let valueY;
  
function setup() {
    
    // Create Canvas of size 500*500
    createCanvas(500, 500);
}
  
function draw() {
    
    // set background color
    background(200);
    
    fill('green');
    
    // set text and text size
    textSize(25);
    text('Click to flip the the figure', 30, 30);
    
    // use of KeyIsPressed
    if (keyIsPressed) {
        fill(valueX, 255 - valueY, 255 - valueX);
        
        // draw rectangle 
        rect(mouseX, mouseY, 115, 115);
        fill(valueY, 255 - valueX, 255 - valueX);
  
        rect(mouseX, mouseY + 115, 115, 115);
        fill(255 - valueY, 255 - valueX, 255 - valueY);
    } else {
        rect(mouseX - 115, mouseY, 115, 115);
        fill(255 - valueY, 255 - valueY, 255 - valueY);
  
        rect(mouseX - 115, mouseY + 115, 115, 115);
    }
}

Output:
Before:

After:

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




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