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How to create a triangle with a dashed pattern border using FabricJS?
How to create a triangle with a dashed pattern border using FabricJS?
In this tutorial, we will create a triangle with a dotted pattern border using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we must create an instance of the Fabric.Triangle class and add it to the canvas.
We can change the appearance of the border dash by using the borderDashArray property. However, our triangle object must have a border for this property to work. This property will have no effect if an incorrect value is specified for the hasBorders property.
Syntax
new fabric.Triangle({ borderDashArray: Array }: Object)Parameters
Options (optional) - This parameter is a Object< /em> Provides additional customization to our triangle. Using this parameter, you can change properties related to the object for which borderDashArray is a property, such as color, cursor, stroke width, and many other properties
borderDashArray - This property accepts a Array pattern that specifies dashes separated by array declarations.
Options Keys
Example 1
Passing borderDashArray as key with custom value
Let’s look at an example using FabricJS Code example for creating a dashed pattern border using the borderDashArray property. In this example, we're using a [7,10] array, which tells us that the pattern will be created by drawing a 7px long line, followed by a 10px gap, and repeating this same pattern over and over again.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Passing borderDashArray as key with a custom value</h2>
<p>Select the triangle to see the dash pattern</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a triangle object
var triangle = new fabric.Triangle({
left: 105,
top: 60,
width: 100,
height: 70,
fill: "#deb887",
borderColor: "red",
borderDashArray: [7, 10],
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>Example 2
Passing hasBorders key with value "false"
As we can see in this example, even if we have assigned properties borderColor and borderDashArray have the correct values, they have no effect because the hasBorders property is already set to false. When set to False, the object's bounding box is not rendered.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Passing hasBorders key with the value "false"</h2>
<p>Select the triangle and observe that its borders have not been rendered.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a triangle object
var triangle = new fabric.Triangle({
left: 105,
top: 60,
width: 100,
height: 70,
fill: "#deb887",
borderColor: "red",
borderDashArray: [7, 10],
hasBorders: false,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>The above is the detailed content of How to create a triangle with a dashed pattern border using FabricJS?. For more information, please follow other related articles on the PHP Chinese website!
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