Responsive canvas example

Sets up a canvas, stage, and tick

by LĂ©o Durand

HTML

<canvas id="canvas" width="800" height="600"></canvas>

CSS

html, body {
    padding: 0; margin: 0;
    overflow:hidden;
}
canvas {
}

JavaScript

var stage = new createjs.Stage("canvas");

var c = new createjs.Shape();
c.graphics.f("#f00").dc(0,0,50); // Drawn a 100x100 circle from the center

var t = new createjs.Text("Resize the browser/frame to redraw", "24px Arial bold", "#000");
t.x = t.y = 20;
stage.addChild(c, t);

window.addEventListener("resize", handleResize);
function handleResize() {
    var w = window.innerWidth;
    var h = window.innerHeight;
    stage.canvas.width = w;
    stage.canvas.height = h;
    //
    var ratio = 100/100; // 100 is the width and height of the circle content.
    var windowRatio = w/h;
    var scale = w/100;
    if (windowRatio > ratio) {
        scale = h/100;
    }
    // Scale up to fit width or height
    c.scaleX= c.scaleY = scale; 
    
    // Center the shape
    c.x = w / 2;
    c.y = h / 2;
        
    stage.update();
}
       
handleResize(); // First draw