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How to set a dash pattern for the control corners of a rectangle using FabricJS?

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2023-08-30 15:21:031155browse

如何使用 FabricJS 为矩形的控制角设置虚线图案？

In this tutorial, we will learn how to use FabricJS to implement a dotted pattern that controls the corners of a rectangle. The control corners of an object allow us to scale, stretch or change its position.

We can customize the control corner in many ways, such as adding a specific color to it, changing its size, etc. We can also specify the dash pattern that controls the corners using the cornerDashArray property.

Syntax

new fabric.Rect({ cornerDashArray: Array }: Object)

Parameters

  • Options (optional) - This parameter is a ## that provides additional customization #Object to our rectangle. Using this parameter, you can change properties related to the object for which cornerDashArray is a property, such as color, cursor, stroke width, and many other properties.

    • Option Key

    • cornerDashArray - This property accepts an Array which allows us to specify A dotted pattern that controls the corners. For example, if we pass an array with values ​​[2,3], it represents a dash pattern of 2px dashes and 3px gaps, and this pattern repeats infinitely.

    Example 1

    Default appearance of the control corner

    Let’s look at a code example that describes the default appearance of the control corner rectangular object. Since we are not using the cornerDashArray attribute, there is no Showing dash pattern. 

    <!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>Default appearance of controlling corners</h2>
   <p>Select the rectangle to see the default appearance</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 rectangle object
      var rect = new fabric.Rect({
         left: 125,
         top: 90,
         width: 170,
         height: 70,
         fill: "#cf1020",
         borderColor: "black",
         borderScaleFactor: 3,
         cornerColor: "#3b7a57",
      });

      // Add it to the canvas
      canvas.add(rect);
   </script>
</body>
</html>

    Example 2

    Passing cornerDashArray property as key

    In this example, we are passing value [1,2,1 to cornerDashArray property ]. this Meaning a dotted pattern will be created with a 1px long line followed by A 2px gap, then again draw a 1px long line, after which a 1px gap will be drawn Production and more. 

    <!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 cornerDashArray property as key</h2>
   <p>Select the rectangle to see the appearance of the controlling corners with 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 rectangle object
      var rect = new fabric.Rect({
         left: 125,
         top: 90,
         width: 170,
         height: 70,
         fill: "#cf1020",
         borderColor: "black",
         borderScaleFactor: 3,
         cornerColor: "#3b7a57",
         cornerDashArray: [1, 2, 1],
      });

      // Add it to the canvas
      canvas.add(rect);
   </script>
</body>
</html>

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