Canvas Tag in HTML
Sep 04, 2024 pm 04:27 PM
Canvas means drawing images on the browser pages. The Canvas Tag in HTML is one such element that provides HTML with a bitmap surface, like a blank canvas consisting map of pixels, which might contain more than two colors, to work with. The
Initially, HTML does not support canvas, but later HTML5 introduced this canvas feature. This
Real-Time Example:Instead of writing standalone code for implementing graphics for each and every shape, it will become an overload on the processor. So to overcome this kind of situations, developers come up with a canvas tag in HTML. Less code can give us an exact graphic animation shape.
Syntax
Canvas feature in HTML is working by applying
<canvas> //specify some properties inside canvas tag because different shape have different properties like width="" ,height="" , style=”” //code </canvas> <script> //script code for animations and graphics </script>
Examples to Implement Canvas Tag in HTML
Here is the example:
Example #1
A circle inside rectangle with Canvas Example:
?Code:
<!DOCTYPE html>
<html>
<head>
<title>
Canvas in HTM5
</title>
<!--CSS Styles-->
<style>
h1
{
color: green;
text-align:center;
}
p
{
color:brown;
border: solid 2px blue;
font-size: 25px;
}
</style>
</head>
<body>
<h1>
Circle Shape inside Rectangle Shape
</h1>
<canvas id="rectangleCircle" width="300" height="200" style="border:2px solid red;">
</canvas>
<script>
var circle = document.getElementById("rectangleCircle");// with id drawing circle shape with script
var creatingCircle = circle.getContext("2d");//get the circle type from 2d shape
creatingCircle.beginPath();//circle shape begin
creatingCircle.arc(150,100,80,4,4*Math.PI);//circle x, y and size of the circle
creatingCircle.stroke();//stroke of the circle
</script>
</body>
</html>
?Output:
Example #2
Text inside the circle shape with Canvas Example:
Code:
/strong><!DOCTYPE html>
<html>
<head>
<title>
Canvas in HTM5
</title>
<!--CSS Styles-->
<style>
h1
{
color: red;
text-align:center;
}
p
{
color:green;
border: solid 2px maroon;
font-size: 25px;
}
</style>
</head>
<body>
<h1>
Text Inside the Circle Shape
</h1>
<canvas id="rectangleCircle" width="300" height="200" style="border:2px solid navy;">
</canvas>
<script>
var circle = document.getElementById("rectangleCircle");// with id drawing circle shape with script
var creatingCircle = circle.getContext("2d");//get the circle type from 2d shape
creatingCircle.beginPath();//circle shape begin
creatingCircle.arc(150,100,100,4,4*Math.PI);//circle x, y and size of the circle
creatingCircle.stroke();//stroke of the circle
creatingCircle.font = "30px Arial";//Creating a font
creatingCircle.strokeText("EDUCBA",100,90);// Creating text inside the circle
</script>
</body>
</html>
Output:
Example #3
Draw the line with Canvas Example:
Code:?
<!DOCTYPE html>
<html>
<head>
<title>
Canvas in HTM5
</title>
<!--CSS Styles-->
<style>
h1
{
color: blue;
text-align:center;
}
p
{
color:red;
border: solid 2px orange;
font-size: 25px;
}
</style>
</head>
<body>
<h1>
Draw the Line with Canvas
</h1>
<canvas id="lineID" width="400" height="400" style="border:2px solid orange;">
</canvas>
<script>
var line = document.getElementById("lineID");// with id drawing line shape with script
var lineCreate = line.getContext("2d");//get the line type from 2d shape
lineCreate.moveTo(0,0);//move the line
lineCreate.lineTo(400,400);//Where to where line has to move
lineCreate.stroke();//line stroke
</script>
</body>
</html>
Output:
Example #4
Triangle shape with Canvas Example:
Code:?
<!DOCTYPE html>
<html>
<head>
<title>
Canvas in HTM5
</title>
<!--CSS Styles-->
<style>
h1
{
color: fuchsia;
text-align:center;
}
p
{
color:blue;
border: solid 2px skyblue;
font-size: 25px;
}
</style>
</head>
<body>
<h1>
Triangle Shape with Canvas
</h1>
<canvas id="triangleID" width="300" height="300" style="border:2px solid skyblue;">
</canvas>
<script>
var canvas = document.getElementById('triangleID');// with id drawing traingles shape with script
if (canvas.getContext)
{
var traingle = canvas.getContext('2d');//get the traingels type from 2d shape
//Creating the traingle
traingle.beginPath();
traingle.moveTo(25,25);
traingle.lineTo(105,25);
traingle.lineTo(25,105);
traingle.fill();
// Triangle can be stroked with below fuctions
traingle.beginPath();
traingle.moveTo(125,125);
traingle.lineTo(125,45);
traingle.lineTo(45,125);
traingle.closePath();
traingle.stroke();
} else
{
alert('Your browser does ot support this feature');//alert the user
document.write('Your browser does ot support this feature');//display the output
}
</script>
</body>
</html>
Output:
?Conclusion
The canvas tag is introduced in the HTML5 version. Both canvas and JavaScript code gives you accurate shapes to draw with canvas tag. We can draw a circle, rectangle, line, triangle shapes etc.
The above is the detailed content of Canvas Tag in HTML. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What are the essential HTML elements for structuring a webpage?
Jul 03, 2025 am 02:34 AM
The web page structure needs to be supported by core HTML elements. 1. The overall structure of the page is composed of , , which is the root element, which stores meta information and displays the content; 2. The content organization relies on title (-), paragraph () and block tags (such as ,) to improve organizational structure and SEO; 3. Navigation is implemented through and implemented, commonly used organizations are linked and supplemented with aria-current attribute to enhance accessibility; 4. Form interaction involves , , and , to ensure the complete user input and submission functions. Proper use of these elements can improve page clarity, maintenance and search engine optimization.
Handling reconnections and errors with HTML5 Server-Sent Events.
Jul 03, 2025 am 02:28 AM
When using HTML5SSE, the methods to deal with reconnection and errors include: 1. Understand the default reconnection mechanism. EventSource retrys 3 seconds after the connection is interrupted by default. You can customize the interval through the retry field; 2. Listen to the error event to deal with connection failure or parsing errors, distinguish error types and execute corresponding logic, such as network problems relying on automatic reconnection, server errors manually delay reconnection, and authentication failure refresh token; 3. Actively control the reconnection logic, such as manually closing and rebuilding the connection, setting the maximum number of retry times, combining navigator.onLine to judge network status to optimize the retry strategy. These measures can improve application stability and user experience.
Declaring the correct HTML5 doctype for modern pages.
Jul 03, 2025 am 02:35 AM
Doctype is a statement that tells the browser which HTML standard to use to parse the page. Modern web pages only need to be written at the beginning of the HTML file. Its function is to ensure that the browser renders the page in standard mode rather than weird mode, and must be located on the first line, with no spaces or comments in front of it; there is only one correct way to write it, and it is not recommended to use old versions or other variants; other such as charset, viewport, etc. should be placed in part.
Implementing client-side form validation using HTML attributes.
Jul 03, 2025 am 02:31 AM
Client-sideformvalidationcanbedonewithoutJavaScriptbyusingHTMLattributes.1)Userequiredtoenforcemandatoryfields.2)ValidateemailsandURLswithtypeattributeslikeemailorurl,orusepatternwithregexforcustomformats.3)Limitvaluesusingmin,max,minlength,andmaxlen
Improving SEO with HTML5 semantic markup and Microdata.
Jul 03, 2025 am 01:16 AM
Using HTML5 semantic tags and Microdata can improve SEO because it helps search engines better understand page structure and content meaning. 1. Use HTML5 semantic tags such as,,,, and to clarify the function of page blocks, which helps search engines establish a more accurate page model; 2. Add Microdata structured data to mark specific content, such as article author, release date, product price, etc., so that search engines can identify information types and use them for display of rich media summary; 3. Pay attention to the correct use of tags to avoid confusion, avoid duplicate tags, test the effectiveness of structured data, regularly update to adapt to changes in schema.org, and combine with other SEO means to optimize for long-term.
How to group options within a select dropdown using html?
Jul 04, 2025 am 03:16 AM
Use tags in HTML to group options in the drop-down menu. The specific method is to wrap a group of elements and define the group name through the label attribute, such as: 1. Contains options such as apples, bananas, oranges, etc.; 2. Contains options such as carrots, broccoli, etc.; 3. Each is an independent group, and the options within the group are automatically indented. Notes include: ① No nesting is supported; ② The entire group can be disabled through the disabled attribute; ③ The style is restricted and needs to be beautified in combination with CSS or third-party libraries; plug-ins such as Select2 can be used to enhance functions.
Implementing Clickable Buttons Using the HTML button Element
Jul 07, 2025 am 02:31 AM
To use HTML button elements to achieve clickable buttons, you must first master its basic usage and common precautions. 1. Create buttons with tags and define behaviors through type attributes (such as button, submit, reset), which is submitted by default; 2. Add interactive functions through JavaScript, which can be written inline or bind event listeners through ID to improve maintenance; 3. Use CSS to customize styles, including background color, border, rounded corners and hover/active status effects to enhance user experience; 4. Pay attention to common problems: make sure that the disabled attribute is not enabled, JS events are correctly bound, layout occlusion, and use the help of developer tools to troubleshoot exceptions. Master this
Integrating CSS and JavaScript effectively with HTML5 structure.
Jul 12, 2025 am 03:01 AM
HTML5, CSS and JavaScript should be efficiently combined with semantic tags, reasonable loading order and decoupling design. 1. Use HTML5 semantic tags, such as improving structural clarity and maintainability, which is conducive to SEO and barrier-free access; 2. CSS should be placed in, use external files and split by module to avoid inline styles and delayed loading problems; 3. JavaScript is recommended to be introduced in front, and use defer or async to load asynchronously to avoid blocking rendering; 4. Reduce strong dependence between the three, drive behavior through data-* attributes and class name control status, and improve collaboration efficiency through unified naming specifications. These methods can effectively optimize page performance and collaborate with teams.
