In this article, we are going to see how to change the padding of a canvas polygon using FabricJS. The canvas polygon means the polygon is movable and can be stretched according to requirement. Further, the polygon can be customized when it comes to initial stroke color, height, width, fill color, or stroke width.
To make it possible we are going to use a JavaScript library called FabricJS. After importing the library, we will create a canvas block in the body tag that will contain the polygon. After this, we will initialize instances of Canvas and polygon provided by FabricJS and change the padding of the polygon using padding property and render the polygon on the Canvas as given in the example below.
Syntax:
fabric.Polygon([
{ x: pixel, y: pixel },
{ x: pixel, y: pixel },
{ x: pixel, y: pixel},
{ x: pixel, y: pixel},
{ x: pixel, y: pixel }],
{
padding: number
});
Parameter: This property accepts a single parameter as mentioned above and described below:
- padding: It specifies the padding between the controlling border and the canvas object.
Note: Dimension pixels is must to create a polygon.
Below examples illustrate the Fabric.JS Polygon padding property in JavaScript:
Example 1: In this example, padding will be positive.
<!DOCTYPE html> <html>
<head>
<!-- Loading the FabricJS library -->
<script src=
</script>
</head>
<body>
<div style="text-align: center;width: 600px;">
<h1 style="color: green;">
GeeksforGeeks
</h1>
<b>
Fabric.js | Polygon Padding Property
</b>
</div>
<canvas id="canvas"
width="600"
height="200"
style="border:1px solid #000000;">
</canvas>
<script>
// Initiate a Canvas instance
var canvas = new fabric.Canvas("canvas");
// Initiate a polygon instance
var polygon = new fabric.Polygon([
{ x: 295, y: 10 },
{ x: 235, y: 198 },
{ x: 385, y: 78},
{ x: 205, y: 78},
{ x: 355, y: 198 }], {
fill: 'yellow',
padding: 55
});
// Render the polygon in canvas
canvas.add(polygon);
</script>
</body>
</html>
|
Output:
Example 2: In this example padding will negative.
<!DOCTYPE html> <html>
<head>
<!-- Loading the FabricJS library -->
<script src=
</script>
</head>
<body>
<div style="text-align: center;width: 600px;">
<h1 style="color: green;">
GeeksforGeeks
</h1>
<b>
Fabric.js | Polygon Padding Property
</b>
</div>
<canvas id="canvas"
width="600"
height="200"
style="border:1px solid #000000;">
</canvas>
<script>
// Initiate a Canvas instance
var canvas = new fabric.Canvas("canvas");
// Initiate a polygon instance
var polygon = new fabric.Polygon([
{ x: 295, y: 10 },
{ x: 235, y: 198 },
{ x: 385, y: 78},
{ x: 205, y: 78},
{ x: 355, y: 198 }], {
fill: 'yellow',
padding: -15
});
// Render the polygon in canvas
canvas.add(polygon);
</script>
</body>
</html>
|
Output: