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The CanvasRenderingContext2D.lineJoin property of the Canvas 2D API determines the shape used to join two line segments where they meet.

This property has no effect wherever two connected segments have the same direction, because no joining area will be added in this case. Degenerate segments with a length of zero (i.e., with all endpoints and control points at the exact same position) are also ignored.

Note: Lines can be drawn with the stroke()strokeRect(), and strokeText() methods.

Syntax

ctx.lineJoin = "bevel" || "round" || "miter";

Options

There are three possible values for this property: "round", "bevel", and "miter". The default is "miter".

"round"
Rounds off the corners of a shape by filling an additional sector of disc centered at the common endpoint of connected segments. The radius for these rounded corners is equal to the line width.
"bevel"
Fills an additional triangular area between the common endpoint of connected segments, and the separate outside rectangular corners of each segment.
"miter"
Connected segments are joined by extending their outside edges to connect at a single point, with the effect of filling an additional lozenge-shaped area. This setting is affected by the miterLimit property. Default value.

Examples

Changing the joins in a path

This example applies rounded line joins to a path.

HTML

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

JavaScript

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

ctx.lineWidth = 20;
ctx.lineJoin = 'round';
ctx.beginPath();
ctx.moveTo(20, 20);
ctx.lineTo(190, 100);
ctx.lineTo(280, 20);
ctx.lineTo(280, 150);
ctx.stroke();

Result

Comparison of line joins

The example below draws three different paths, demonstrating each of the three lineJoin options.

var ctx = document.getElementById('canvas').getContext('2d');
var lineJoin = ['round', 'bevel', 'miter'];
ctx.lineWidth = 10;

for (let i = 0; i < lineJoin.length; i++) {
  ctx.lineJoin = lineJoin[i];
  ctx.beginPath();
  ctx.moveTo(-5, 5 + i * 40);
  ctx.lineTo(35, 45 + i * 40);
  ctx.lineTo(75, 5 + i * 40);
  ctx.lineTo(115, 45 + i * 40);
  ctx.lineTo(155, 5 + i * 40);
  ctx.stroke();
}

ScreenshotLive sample

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.lineJoin' 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

  • In WebKit- and Blink-based Browsers, a non-standard and deprecated method ctx.setLineJoin() is implemented in addition to this property.

See also

Etiquetas y colaboradores del documento

Colaboradores en esta página: mfluehr, fscholz, thatmichael85, nmve, erikadoyle, Wazner
Última actualización por: mfluehr,