# HTML Canvas Curves

## HTML Canvas Curves

The three most used methods for drawing curves in canvas are:

• The arc() method (described in Canvas Circles chapter)
• The quadraticCurveTo() method
• The bezierCurveTo() method

## The quadraticCurveTo() Method

The quadraticCurveTo() method is used to define a quadratic Bezier curve.

The quadraticCurveTo() method has the following parameters:

Parameter Description
cpx Required. The x-coordinate of the control point
cpy Required. The y-coordinate of the control point
x Required. The x-coordinate of the end point
y Required. The y-coordinate of the end point

The quadraticCurveTo() method requires two points: One control point and one end point. The starting point is the latest point in the current path, which can be changed using moveTo() before creating the quadratic Bezier curve.

To draw the curve on the canvas, use the following methods:

• beginPath() - Begin a path
• moveTo() - Define the start position
• quadraticCurveTo() - Define the quadratic Bezier curve
• stroke() - Draw it

### Example

This quadratic Bezier curve begins at the point specified by moveTo(): (10, 100). The control point is placed at (250, 170). The curve ends at (230, 20):

Your browser does not support the HTML5 canvas tag.
<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.moveTo(10, 100);
ctx.quadraticCurveTo(250, 170, 230, 20);
ctx.stroke();
</script>
Try it Yourself »

## The bezierCurveTo() Method

The bezierCurveTo() method is used to define a cubic Bezier curve.

The bezierCurveTo() method has the following parameters:

Parameter Description
cp1x Required. The x-coordinate of the first control point
cp1y Required. The y-coordinate of the first control point
cp2x Required. The x-coordinate of the second control point
cp2y Required. The y-coordinate of the second control point
x Required. The x-coordinate of the end point
y Required. The y-coordinate of the end point

The bezierCurveTo() method requires three points: Two control points and one end point. The starting point is the latest point in the current path, which can be changed using moveTo() before creating the cubic Bezier curve.

To draw the curve on the canvas, use the following methods:

• beginPath() - Begin a path
• moveTo() - Define the start position
• bezierCurveTo() - Define the cubic Bezier curve
• stroke() - Draw it

### Example

This cubic Bezier curve begins at the point specified by moveTo(): (20, 20). The first control point is placed at (110, 150). The second control point is placed at (180, 10). The curve ends at (210, 140):

Your browser does not support the HTML5 canvas tag.
<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.moveTo(20, 20);
ctx.bezierCurveTo(110, 150, 180, 10, 210, 140);
ctx.stroke();
</script>
Try it Yourself »

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