HTML - <canvas> Tag

Quiz

Introduction to <canvas> Tag

The HTML <canvas> tag is used to draw the graphics on a webpage, such as lines, shapes and animations through JavaScript. It provides a drawable region defined by width and height attributes. By default, the <canvas> tag is invisible and requires JavaScript to render visual elements.

The <canvas> tag can also be used for creating charts, data visualizations and other graphical content. However, it does not include any built-in drawing capabilities, everything needs to be programmatically specified.

Syntax

Following is the syntax of HTML <canvas> tag −.

<canvas> 
  ...
</canvas>

Attributes

HTML canvas tag supports Global and Event attributes of HTML. Accept some specipic attributes as well which are listed bellow.

Attribute	Value	Description
height	pixels	Specifies the height of the created canvas and the default value is 150.
width	pixels	Specifies the width of the created canvas and Default value is 300.

Example : Drawing a Circle

Lets look at the following example, where we are going to draw the circle using the <canvas> tag.

<!DOCTYPE html>
<html>
<body>
   <canvas id = "tutorial" height = "200" width = "210"
           style = "border:2px solid #8E44AD ">
   </canvas>
   <script>
      var x = document.getElementById("tutorial");
      var y = x.getContext("2d");
      y.beginPath();
      y.arc(100, 100, 90, 0, 2 * Math.PI);
      y.stroke();
   </script>
</body>
</html>

Example : Creating a Textual Graphics

Consider the following example, where we are going to draw the text on the canvas using the canvas tag along with the strokeText() method.

<!DOCTYPE html>
<html>
<body>
   <canvas id="tutorial" width="1000" height="100"></canvas>
	<script>
		var x = document.getElementById("tutorial");
		var y = x.getContext("2d");
		y.font = "60px verdana";
		y.strokeStyle = "green";
		y.strokeText("TUTORIALSPOINT", 20, 60);
	</script>
</body>
</html>

Example : Applying Linear Gradient

Following is the example where we are going to make the linear gradient and fill the rectangle with the gradient.

<!DOCTYPE html>
<html>
<body>
   <canvas id="tutorial" width="600" height="150" 
           style="border:2px solid #D2B4DE;">
   </canvas>
   <script>
      var x = document.getElementById("tutorial");
      if (x.getContext) {
         var y = x.getContext("2d");
         var gradient = y.createLinearGradient(11, 91, 210, 89);
         gradient.addColorStop(0, '#DE3163');
         gradient.addColorStop(1, '#D5F5E3 ');
         y.fillStyle = gradient;
         y.fillRect(11, 12, 570, 120);
      }
   </script>
</body>
</html>

Example : Applying with fillText()

In the following example, we are going to use the fillText()method to draw text on the canvas.

<!DOCTYPE html>
<html>
<body>
   <canvas id="tutorial" width="500" height="200" 
           style="border:3px solid #27AE60">
   </canvas>
   <script>
      var x = document.getElementById("tutorial");
      var y = x.getContext("2d");
      y.font = "bold 35px solid";
      y.fillText("TUTORIALSPOINT", 100, 100);
   </script>
</body>
</html>

Supported Browsers

Tag
canvas	Yes 4.0	Yes 9.0	Yes 2.0	Yes 3.1	Yes 9.0

html_tags_reference.htm

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