The basic and the toprated topics of HTML5 Canvas like html5 canvas image annotation, html5 canvas drag and drop, html5 canvas layers and all the topics of html5 canvas javascript framework covered by theiteducation in both forms if you want to learn the basic and fundamentals of html5 canvas through video tutorial then you can visit our youtube channel. Moreover a playlist of all video tutorials is embeded in the last. However Let start our tutorial how to draw Bezier Curve and Quadratic Curve using html5 canvas.
Bezier Curve Tutorial
In this articlle we will learn to draw Bezier Curve and Quadratic Curve.
Similarly There are two types of curves.
- cubic bezier Curve
- quadratic bezier Curve
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cubic bezier Curve
This is normal cubic Bezier curve.It uses two points which are used as controll point.
The code for drawing a cubic Bezier curve is given
context.bezierCurveTo(cp1x,cp1y,cp2x,cp2y,x,y);
This method bezierCurveTo() has six argument.1: cp1x
Now This is xCoordinate of first controll point.2: cp2y
Similarly This is the yCoordinate of controll point 1.3: cp2x
This is the xCoordinate of controll point 2.4: cp2y
This is yCoordinate of controll point 25 x
xCoordinate of end point.6 y
yCoordinate of end point
How To Draw Bezier Curve
The code for drawing a cubic bezier Curve from point (150,0) to point(150,300) with first controll point(0,125) and second controll point(300,175) will be as following.
context.moveTo(150,0);
context.bezierCurveTo(0,125,300,175,150,300);
quadratic Bezier Curve
In this type of Bezier Curve , there are one controll point.
The method for drawing curve is quadraticCurveTo().
The code for drawing a quadratic Bezier Curve is
context.quadraticCurveTo(cpx,cpy,x,y);
This method takes four argument.
1 cpx
Similarly This is xCoordinates of controll point 1
2 cpy
This is yCoordinates of controll point .
x
However This is xCoordinates of ending point of curve.
y
This is yCoordinate of ending point of curve.
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How To draw Quadratic Bezier Curve using html5 Canvas
The code for drawing a quadratic Bezier Curve from(0,0)to (300,0) with controll point(150,150) will be:
context.moveTo(0,0);
context.quadraticCurveTo(150,150,300,0);
Drawing Bezier Curve and Quadratic Bezier Curve using html5 canvas:code example
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<!DOCTYPE html>
<html>
<head>
<title>Drawing </title>
</head>
<body>
<canvas id ="myCanvas" width ="600" height ="400"
style="border: 1px solid blue;">
</canvas>
<script>
var canvas = document.getElementById("myCanvas");
var context =canvas.getContext('2d');
//style and drawing for cubic quad curve
context.beginPath();
context.lineWidth =5;
context.strokeStyle ='#0000ff';
context.moveTo(150,0);
context.bezierCurveTo(0,125,300,175,150,300);
context.stroke();
// style and drawing of Bazier Quad Curve
ontext.beginPath();
context.lineWidth =5;
context.strokeStyle ='#00ffff';
context.moveTo(0,0);
context.quadraticCurveTo(150,150,300,0);
context.stroke();
</script>
</body>
</html>
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Drawing Bezier Curve and Quadratic Bezier Curve live code demo
[codepen_embed height=300 theme_id=1 slug_hash=’XJaWwL’ user=’aslamwaqar’ default_tab=’html’ animations=’run’]
[/codepen_embed]
