CanvasRenderingContext2D: lineJoin property
===========================================

 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.


Value
-----

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

![Three horizontal zigzag lines with round, bevel, and miter values, shown from top to bottom respectively.](/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin/canvas_linejoin.png)

`"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


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


#### JavaScript


```js
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.
```

<canvas id="canvas" width="150" height="150"></canvas>
```



```js
const ctx = document.getElementById("canvas").getContext("2d");
ctx.lineWidth = 10;

["round", "bevel", "miter"].forEach((join, i) => {
  ctx.lineJoin = join;
  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();
});
```


| Screenshot | Live sample |
| --- | --- |
|  |  |

Specifications
--------------

| Specification |
| --- |
| HTML Standard # dom-context-2d-linejoin-dev |

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

### WebKit/Blink-specific notes

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

* The interface defining this property: `CanvasRenderingContext2D`
* `CanvasRenderingContext2D.lineCap`
* `CanvasRenderingContext2D.lineWidth`
* Applying styles and color