# CanvasRenderingContext2D.bezierCurveTo()

The `CanvasRenderingContext2D``.bezierCurveTo()` method of the Canvas 2D API adds a cubic Bézier curve to the current sub-path. It requires three points: the first two are control points and the third one is the end point. The starting point is the latest point in the current path, which can be changed using `moveTo()` before creating the Bézier curve.

## Syntax

```void ctx.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y);
```

### Parameters

`cp1x`
The x-axis coordinate of the first control point.
`cp1y`
The y-axis coordinate of the first control point.
`cp2x`
The x-axis coordinate of the second control point.
`cp2y`
The y-axis coordinate of the second control point.
`x`
The x-axis coordinate of the end point.
`y`
The y-axis coordinate of the end point.

## Examples

### How bezierCurveTo works

This example shows how a cubic Bézier curve is drawn.

#### HTML

```<canvas id="canvas"></canvas>
```

#### JavaScript

```// Define canvas and context
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

// Define the points as {x, y}
let start = { x: 50,    y: 20  };
let cp1 =   { x: 230,   y: 30  };
let cp2 =   { x: 150,   y: 80  };
let end =   { x: 250,   y: 100 };

// Cubic Bézier curve
ctx.beginPath();
ctx.moveTo(start.x, start.y);
ctx.bezierCurveTo(cp1.x, cp1.y, cp2.x, cp2.y, end.x, end.y);
ctx.stroke();

// Start and end points
ctx.fillStyle = 'blue';
ctx.beginPath();
ctx.arc(start.x, start.y, 5, 0, 2 * Math.PI);  // Start point
ctx.arc(end.x, end.y, 5, 0, 2 * Math.PI);      // End point
ctx.fill();

// Control points
ctx.fillStyle = 'red';
ctx.beginPath();
ctx.arc(cp1.x, cp1.y, 5, 0, 2 * Math.PI);  // Control point one
ctx.arc(cp2.x, cp2.y, 5, 0, 2 * Math.PI);  // Control point two
ctx.fill();```

#### Result

In this example, the control points are red and the start and end points are blue.

### A simple Bézier curve

This example draws a simple Bézier curve using `bezierCurveTo()`.

#### HTML

```<canvas id="canvas"></canvas>
```

#### JavaScript

The curve begins at the point specified by `moveTo()`: (30, 30). The first control point is placed at (120, 160), and the second at (180, 10). The curve ends at (220, 140).

```const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

ctx.beginPath();
ctx.moveTo(30, 30);
ctx.bezierCurveTo(120,160, 180,10, 220,140);
ctx.stroke();```

## Specifications

Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.beziercurveto' in that specification.
Living Standard

## Browser compatibility

Update compatibility data on GitHub
Desktop Mobile Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Chrome Full support Yes Edge Full support 12 Firefox Full support 1.5 IE Full support Yes Opera Full support Yes Safari Full support Yes WebView Android Full support Yes Chrome Android Full support Yes Firefox Android Full support 4 Opera Android Full support Yes Safari iOS Full support Yes Samsung Internet Android Full support Yes

Full support
Full support