JavaScript - translate drawing on canvas

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Created by:

Blessing-D

574

In this article, we would like to show you how to translate drawing on canvas using JavaScript.

Quick solution:

var canvas = document.querySelector('#my-canvas');
var context = canvas.getContext('2d');
context.translate(50, -60);
// draw something

Practical example

In this example, we use translate() method that moves the canvas and its origin x and y units by given value.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <style>

    #my-canvas { border: 1px solid gray; }

  </style>
</head>
<body>
  <canvas id="my-canvas" width="300" height="200"></canvas>
  <script>

    var canvas = document.querySelector('#my-canvas');
    var context = canvas.getContext('2d');

    function drawSquare(x, y, side, color) {
        context.beginPath();
        context.rect(x, y, side, side); // rect(x, y, width, height)
        context.strokeStyle = color;
        context.stroke();
    }

    drawSquare(50, 80, 100, 'green');

    context.translate(50, -60);
    drawSquare(50, 80, 100, 'red');

  </script>
</body>
</html>

result: