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HTML5 canvas quadraticCurveTo Method

HTML5 track Tag Reference HTML5 canvas reference

Example

Draw a path from one point to another and stretch the path from a controllpoint:

JavaScript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.moveTo(20,20);
ctx.quadraticCurveTo(20,100,200,20);
ctx.stroke();

Try it yourself »

Definition and Usage

The quadraticCurveTo method creates a line from the path's current point to the specified point, via a controlpoint.

The quadraticCurveTo method takes four parameters, the x and y coordinates for the controlpoint, and the x and y coordinates for the line's destination.

Current point

moveTo(20,20)

CurveTo point

quadraticCurveTo(20,100,200,20)

Controllpoint

quadraticCurveTo(20,100,200,20)

Tip: Check out the bezierCurveTo method. It has two controllpoints instead of one.

JavaScript syntax:	context.quadraticCurveTo(cpx,cpy,x,y);

Browser Support

The quadraticCurveTo method is supported in all major browsers.

Parameter Values

Parameter	Values	Description	Play it
cpx	x-coordinate	The x-coordinate of the controlpoint	Play it »
cpy	y-coordinate	The y-coordinate of the controlpoint	Play it »
x	x-coordinate	The x-coordinate of where to create the line to	Play it »
y	y-coordinate	The y-coordinate of where to create the line to	Play it »