p5.js Keyboard keyIsPressed

0 0 1 minute read

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

Syntax:

keyIsPressed

The below program illustrates the key is pressed variable in p5.js.

Example-1:

javascript

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:

javascript

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 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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