- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to draw a quadratic curve on HTML5 Canvas?
The HTML5 <canvas> tag is used to draw graphics, animations, etc. using scripting. It is a new tag introduced in HTML5. The canvas element has a DOM method called getContext, which obtains rendering context and its drawing functions. This function takes one parameter, the type of context 2d.
To draw a Quadratic curve with HTML5 canvas, use the quadraticCurveTo() method. 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.
You can try to run the following code to learn how to draw a quadratic curve on HTML5 Canvas. The x and y parameters in quadraticCurveTo() method are the coordinates of the endpoint. cpx and cpy are the coordinates of the control point.
Example
<!DOCTYPE html> <html> <head> <title>HTML5 Canvas Tag</title> </head> <body> <canvas id="newCanvas" width="500" height="300" style="border:1px solid #000000;"></canvas> <script> var c = document.getElementById('newCanvas'); var ctx = c.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(); </script> </body> </html>