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HTML canvas quadraticCurveTo() Method

HTML canvas Reference HTML Canvas Reference

Example

Draw a quadratic Bézier curve:

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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 »

Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
quadraticCurveTo() Yes 9.0 Yes Yes Yes

Definition and Usage

The quadraticCurveTo() method adds a point to the current path by using the specified control points that represent a quadratic Bézier curve.

A quadratic Bézier curve requires two points. The first point is a control point that is used in the quadratic Bézier calculation and the second point is the ending point for the curve. The starting point for the curve is the last point in the current path. If a path does not exist, use the beginPath() and moveTo() methods to define a starting point.

A quadratic Bézier curve

Start point:
moveTo(20,20)
Control point:
quadraticCurveTo(20,100,200,20)
End point:
quadraticCurveTo(20,100,200,20)

Tip: Check out the bezierCurveTo() method. It has two control-points instead of one.


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

Parameter Values

Parameter Description Play it
cpx The x-coordinate of the Bézier control point Play it »
cpy The y-coordinate of the Bézier control point Play it »
x The x-coordinate of the ending point Play it »
y The y-coordinate of the ending point Play it »

HTML canvas Reference HTML Canvas Reference