EN
JavaScript - flip canvas vertically
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In this article, we would like to show you how to flip canvas vertically using JavaScript.
Quick solution:
var canvas = document.querySelector('#my-canvas');
var context = canvas.getContext('2d');
context.scale (1, -1); // <--- flip vertically
context.font = '55px Arial';
context.fillText('text', 10, -15);
Note:
The y-coordinates of all points inside the
canvasare negative now.
Practical example
In this example, we use scale() method with negative y coordinate to flip the text on canvas vertically.
// ONLINE-RUNNER:browser;
<!doctype html>
<html>
<head>
<style>
#my-canvas { border: 1px solid gray; }
</style>
</head>
<body>
<canvas id="my-canvas" width="110" height="65"></canvas>
<script>
var canvas = document.querySelector('#my-canvas');
var context = canvas.getContext('2d');
context.scale (1, -1); // <--- flip vertically
context.font = '55px Arial';
context.fillText('text', 10, -15);
</script>
</body>
</html>