p5.js resizeCanvas() Function

Last Updated : 16 Aug, 2023

The resizeCanvas() function is used to resize the canvas to the height and width given as parameters. The canvas is immediately redrawn after the resize takes place unless the optional 'noRedraw' parameter is set to true. Syntax:

resizeCanvas(w, h, [noRedraw])

Parameters: This function accepts three parameters as mentioned above and described below:

w: It is a number representing the width of the new canvas.
h: It is a number representing the height of the new canvas.
noRedraw: It is a boolean value which specifies if the canvas is immediately redrawn when resized.

Below example illustrates the resizeCanvas() function in p5.js: Example 1: In this example, we fixed the increase size.

javascript

function setup() {
  createCanvas(200, 200);
  textSize(16);

  rect(0, 0, height, width);
  background('green');
  text("This is the canvas area", 20, 80);
  text("Canvas height: " + height, 25, 100);
  text("Canvas width: " + width, 25, 120);
}

function mouseClicked() {
  resizeCanvas(300, 300, true);

  rect(0, 0, height, width);
  background('green');
  text("This is the canvas area", 50, 130);
  text("Canvas height: " + height, 50, 150);
  text("Canvas width: " + width, 50, 170);
}

Output: output of above code

Example 2: In this example, size depends on the click position.

javascript

function setup() {
  createCanvas(200, 200);
  textSize(16);

  rect(0, 0, height, width);
  background('green');
  text("Press anywhere to resize", 10, 20);
  text("Canvas height: " + height, 10, 40);
  text("Canvas width: " + width, 10, 60);
}

function mouseClicked(event) {
  // resize canvas to the
  resizeCanvas(event.x, event.y);

  rect(0, 0, height, width);
  background('green');
  text("Press anywhere to resize", 10, 20);
  text("Canvas height: " + height, 10, 40);
  text("Canvas width: " + width, 10, 60);
}