HTML Canvas - shadowOffsetY Property

The HTML Canvas shadowOffsetY property of Canvas 2D API from the CanvasRenderingContext2D interface is used to specify the vertical distance of the shadow to be drawn for the rendered graphic.

Possible input values

It takes a float integer value representing the shadow length vertically to be needed from the graphic on the Canvas element.

Example

The following example draws a circle onto the Canvas element and applies shadow to it with its offset Y-axis being positive by using the HTML Canvas shadowOffsetY property.

<!DOCTYPE html>
<html lang="en">
<head>
   <title>Reference API</title>
   <style>
      body {
         margin: 10px;
         padding: 10px;
      }
   </style>
</head>
<body>
   <canvas id="canvas" width="200" height="250" style="border: 1px solid black;"></canvas>
   <script>
      var canvas = document.getElementById('canvas');
      var context = canvas.getContext('2d');
      context.shadowColor = 'blue';
      context.shadowBlur = 100;
      context.shadowOffsetY = 50;
      context.fillStyle = 'orange';
      context.arc(100, 100, 50, 0, 2 * Math.PI);
      context.fill();
   </script>
</body>
</html>

Output

The output returned by the following code on the webpage as −

Example

The following example applies shadow to a circle drawn on the Canvas element with the shadow offset Y being negative so that the shadow moves upwards.

<!DOCTYPE html>
<html lang="en">
<head>
   <title>Reference API</title>
   <style>
      body {
         margin: 10px;
         padding: 10px;
      }
   </style>
</head>
<body>
   <canvas id="canvas" width="200" height="250" style="border: 1px solid black;"></canvas>
   <script>
      var canvas = document.getElementById('canvas');
      var context = canvas.getContext('2d');
      context.shadowColor = 'blue';
      context.shadowBlur = 100;
      context.shadowOffsetY = -50;
      context.fillStyle = 'orange';
      context.arc(100, 150, 50, 0, 2 * Math.PI);
      context.fill();
   </script>
</body>
</html>

Output

The output returned by the following code on the webpage as −

html_canvas_shadows_and_transformations.htm