Fabric.js | borderDashArray Property for Triangles

The borderDashArray property in Fabric.js is used to specify the style of dashed lines for the borders of objects. This property can be applied to triangles, which are a simple shape with three sides.

Syntax

triangle.setBorderDashArray([value1, value2, ...]);

Parameters

value1, value2, ...: The lengths of the dashes and gaps in the border, specified in pixels. For example, [5, 3] would create a dashed line with 5-pixel dashes and 3-pixel gaps.

Example

// create a triangle object
var triangle = new fabric.Triangle({
  width: 50,
  height: 50,
  fill: 'red',
  top: 50,
  left: 50,
  // set border dash array
  borderDashArray: [5, 3]
});

// add triangle to canvas
canvas.add(triangle);

In this example, we create a red triangle with a width and height of 50 pixels, positioned at coordinates (50, 50). We also set the borderDashArray property to [5, 3] to create a dashed border around the triangle.

Result

As you can see, the borderDashArray property creates a dotted border around the triangle instead of a solid line. By adjusting the values in the array, you can create different styles of dashed borders for your shapes.

Note

When using the borderDashArray property with triangles, the dashes and gaps will alternate between each side of the triangle. If you want to create a dashed border that follows the outline of the triangle without bending, you will need to use a polygon object with more than three sides.