EN
JavaScript - how to clear canvas with specific color?
6
points
Simple solution:
// clear from x=0, y=0 on area width * height
// color format: 'yellow', '#FFFF00', 'rgb(255,255,0)' or 'rgba(255,255,0,1)'
context.fillStyle = 'yellow';
context.fillRect(0, 0, canvas.width, canvas.height);
Using JavaScript it is possible to clear canvas with specific color in following way.
1. clearRect method example
// ONLINE-RUNNER:browser;
<!doctype html>
<html>
<head>
<style>
#my-canvas { border: 1px solid gray; }
</style>
</head>
<body>
<button onclick="drawCircle();">Draw circle!</button>
<button onclick="clearCanvas();">Clear canvas!</button>
<br /><br />
<canvas id="my-canvas" width="200" height="200"></canvas>
<script>
var canvas = document.querySelector('#my-canvas');
var context = canvas.getContext('2d');
var xCenter = canvas.width / 2;
var yCenter = canvas.height / 2;
var circleRadius = 80;
function drawCircle() {
context.lineWidth = 5.0;
context.strokeStyle = '#0000ff';
context.fillStyle = '#ff0000';
context.beginPath();
context.arc(xCenter, yCenter , circleRadius, 0, 2 * Math.PI);
context.fill();
}
function clearCanvas() {
// color format: 'yellow', '#FFFF00', 'rgb(255,255,0)' or 'rgba(255,255,0,1)'
context.fillStyle = 'yellow';
context.fillRect(0, 0, canvas.width, canvas.height);
}
clearCanvas();
drawCircle();
</script>
</body>
</html>
