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, shape, fill color, or stroke width.
In order to set the border of the canvas polygon, the JavaScript library called FabricJS is been used. 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 set the borders of the canvas polygon using hasBorders property and render the polygon on the Canvas as given in the below example.
Syntax:
fabric.Polygon([
{ x: pixel, y: pixel },
{ x: pixel, y: pixel },
{ x: pixel, y: pixel},
{ x: pixel, y: pixel},
{ x: pixel, y: pixel }],
{ hasBorders: boolean }
);
Parameters: This function accepts a single parameter as mentioned above and described below:
- hasBorders: It specifies whether to make border is visible or not.
Note: Dimension pixels is must to create a polygon.
Below examples illustrate the Fabric.JS Polygon hasBorders property in JavaScript:
Example 1: In this example, hasBorders property is set to false.
<!DOCTYPE html> <html>   <head>      <!-- Loading the FabricJS library -->    <script src=     </script> </head>   <body>     <div style="text-align: center;width: 600px;">         <h1 style="color: green;">             neveropen         </h1>         <b>             Fabric.js | Polygon hasBorders 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 }], {             hasBorders: false         });           // Render the polygon in canvas         canvas.add(polygon);     </script> </body>   </html> |
Output:
Example 2: In this example, hasBorders property is set to true.
<!DOCTYPE html> <html>   <head>     <!-- Loading the FabricJS library -->    <script src=     </script> </head>   <body>     <div style="text-align: center;width: 600px;">         <h1 style="color: green;">             neveropen         </h1>         <b>             Fabric.js | Polygon hasBorders 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 }], {             hasBorders: true         });           // Render the polygon in canvas         canvas.add(polygon);     </script> </body>    </html> |
Output:Â
Reference: http://fabricjs.com/docs/fabric.Polygon.html#hasBorders
