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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();

Result

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

See also

Étiquettes et contributeurs liés au document

Contributeurs à cette page : mfluehr, manngo, fscholz, thatmichael85, nmve, erikadoyle, bleush38p
Dernière mise à jour par : mfluehr,