Static p5_sys::global::keyIsDown

pub static keyIsDown: KeyIsDownInternalType

The keyIsDown() function checks if the key is currently down, i.e. pressed. It can be used if you have an object that moves, and you want several keys to be able to affect its behaviour simultaneously, such as moving a sprite diagonally. You can put in any number representing the keyCode of the key, or use any of the variable keyCode names listed here.

Examples

let x = 100;
let y = 100;

function setup() {
  createCanvas(512, 512);
  fill(255, 0, 0);
}

function draw() {
  if (keyIsDown(LEFT_ARROW)) {
    x -= 5;
  }

  if (keyIsDown(RIGHT_ARROW)) {
    x += 5;
  }

  if (keyIsDown(UP_ARROW)) {
    y -= 5;
  }

  if (keyIsDown(DOWN_ARROW)) {
    y += 5;
  }

  clear();
  ellipse(x, y, 50, 50);
}

let diameter = 50;

function setup() {
  createCanvas(512, 512);
}

function draw() {
  // 107 and 187 are keyCodes for "+"
  if (keyIsDown(107) || keyIsDown(187)) {
    diameter += 1;
  }

  // 109 and 189 are keyCodes for "-"
  if (keyIsDown(109) || keyIsDown(189)) {
    diameter -= 1;
  }

  clear();
  fill(255, 0, 0);
  ellipse(50, 50, diameter, diameter);
}

Parameters

code The key to check for.