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How to add dashes to the border of a selection area on a canvas using FabricJS?
In this article, we are going to learn how to add dashes to the border of a selection area on a canvas using FabricJS. We can achieve this by using the selectionDashArray property. It allows us to make the border of a selection area dashed.
Syntax
new fabric.Canvas(element: HTMLElement|String, { selectionDashArray: Array }: Object)
Parameters
element − This parameter is the <canvas> element itself which can be derived using document.getElementById() or the id of the <canvas> element itself. The FabricJS canvas will be initialized on this element.
options (optional) − This parameter is an Object which provides additional customizations to our canvas. Using this parameter color, cursor, border width and a lot of other properties can be changed related to the canvas, of which selectionDashArray is a property. It accepts an array which determines the dash pattern that we want.
Example 1
Passing the selectionDashArray as key to the class
selectionDashArray allows us to make the border of a selection area dashed. The way to define a dash pattern is by specifying the length of dashes in an array. In the example below we have taken a [7,6] array. This means, there would be a 7px long line followed by a 6px gap and so on.
<!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>Adding dashes to the border of a selection area on a canvas</h2> <p>Select an area around the object. The border of the selection area would have dashed lines.</p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas", { selectionDashArray: [7, 6], selectionBorderColor: "red" }); // Creating an instance of the fabric.Rect class var circle = new fabric.Circle({ left: 200, top: 100, radius: 40, fill: "blue", }); // Adding it to the canvas canvas.add(circle); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); </script> </body> </html>
Example 2
Using selectionDashArray in combination with selectionLineWidth and selectionBorderColor
The selectionDashArray property can be used in a number of ways. One way is to use it in combination with selectionLineWidth and selectionBorderColor which specify the width of the border of a selection and the color of the border of the selection, respectively.
<!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>Adding dashes to the border of a selection area on a canvas</h2> <p>Select an area around the object and observe the outline of the selection area. </p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas", { selectionDashArray: [13, 16], selectionLineWidth: 5, selectionBorderColor: "green", }); // Creating an instance of the fabric.Rect class var circle = new fabric.Circle({ left: 200, top: 100, radius: 40, fill: "blue", }); // Adding it to the canvas canvas.add(circle); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); </script> </body> </html>
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