- HTML5 Tutorial
- HTML5 - Home
- HTML5 - Overview
- HTML5 - Syntax
- HTML5 - Attributes
- HTML5 - Events
- HTML5 - Web Forms 2.0
- HTML5 - SVG
- HTML5 - MathML
- HTML5 - Web Storage
- HTML5 - Web SQL Database
- HTML5 - Server-Sent Events
- HTML5 - WebSocket
- HTML5 - Canvas
- HTML5 - Audio & Video
- HTML5 - Geolocation
- HTML5 - Microdata
- HTML5 - Drag & drop
- HTML5 - Web Workers
- HTML5 - IndexedDB
- HTML5 - Web Messaging
- HTML5 - Web CORS
- HTML5 - Web RTC
- HTML5 Demo
- HTML5 - Web Storage
- HTML5 - Server Sent Events
- HTML5 - Canvas
- HTML5 - Audio Players
- HTML5 - Video Players
- HTML5 - Geo-Location
- HTML5 - Drag and Drop
- HTML5 - Web Worker
- HTML5 - Web slide Desk
- HTML5 Tools
- HTML5 - SVG Generator
- HTML5 - MathML
- HTML5 - Velocity Draw
- HTML5 - QR Code
- HTML5 - Validator.nu Validation
- HTML5 - Modernizr
- HTML5 - Validation
- HTML5 - Online Editor
- HTML5 - Color Code Builder
- HTML5 Useful References
- HTML5 - Quick Guide
- HTML5 - Color Names
- HTML5 - Fonts Reference
- HTML5 - URL Encoding
- HTML5 - Entities
- HTML5 - Char Encodings
- HTML5 Tag Reference
- HTML5 - Question and Answers
- HTML5 - Tags Reference
- HTML5 - Deprecated Tags
- HTML5 - New Tags
- HTML5 Resources
- HTML5 - Useful Resources
- HTML5 - Discussion
HTML5 Canvas - Drawing Quadratic Curves
We require the following methods to draw quadratic curves on the canvas −
S.No. | Method and Description |
---|---|
1 | beginPath() This method resets the current path. |
2 | moveTo(x, y) This method creates a new subpath with the given point. |
3 | closePath() This method marks the current subpath as closed, and starts a new subpath with a point the same as the start and end of the newly closed subpath. |
4 | fill() This method fills the subpaths with the current fill style. |
5 | stroke() This method strokes the subpaths with the current stroke style. |
6 | quadraticCurveTo(cpx, cpy, x, y) This method adds the given point to the current path, connected to the previous one by a quadratic Bezier curve with the given control point. |
The x and y parameters in quadraticCurveTo() method are the coordinates of the end point. cpx and cpy are the coordinates of the control point.
Example
Following is a simple example which makes use of above mentioned methods to draw a Quadratic curves.
<!DOCTYPE HTML> <html> <head> <style> #test { width: 100px; height:100px; margin: 0px auto; } </style> <script type = "text/javascript"> function drawShape() { // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext) { // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); // Draw shapes ctx.beginPath(); ctx.moveTo(75,25); ctx.quadraticCurveTo(25,25,25,62.5); ctx.quadraticCurveTo(25,100,50,100); ctx.quadraticCurveTo(50,120,30,125); ctx.quadraticCurveTo(60,120,65,100); ctx.quadraticCurveTo(125,100,125,62.5); ctx.quadraticCurveTo(125,25,75,25); ctx.stroke(); } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
The above example would draw the following shape −