How to fill the whole canvas with specific color?

You can change the background of the canvas by doing this:

<head>
    <style>
        canvas {
            background-color: blue;
        }
    </style>
</head>

Yes, fill in a Rectangle with a solid color across the canvas, use the height and width of the canvas itself:

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "blue";
ctx.fillRect(0, 0, canvas.width, canvas.height);
canvas{ border: 1px solid black; }
<canvas width=300 height=150 id="canvas">

If you want to do the background explicitly, you must be certain that you draw behind the current elements on the canvas.

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
// Add behind elements.
ctx.globalCompositeOperation = 'destination-over'
// Now draw!
ctx.fillStyle = "blue";
ctx.fillRect(0, 0, canvas.width, canvas.height);

Tags:

Javascript

Html

Canvas

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