How to set the vertical scale factor of an ellipse using FabricJS?-JS Tutorial-php.cn

How to set the vertical scale factor of an ellipse using FabricJS?

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Release： 2023-08-25 21:09:07

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如何使用 FabricJS 设置椭圆的垂直比例因子？

In this tutorial, we will learn how to set the vertical scale factor of an ellipse using FabricJS. The oval is one of the various shapes provided by FabricJS. In order to create an ellipse, we must create an instance of the Fabric.Ellipse class and add it to the canvas. Just as we can specify the position, color, opacity, and size of the ellipse object within the canvas, we can also set the vertical scale of the ellipse object. This can be done using the scaleY property.

Syntax

new fabric.Ellipse({ scaleY : Number }: Object)

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Parameters

Options (optional) - This parameter is a Object< /em> Provides additional customization for our ellipse. Using this parameter, you can change the color, cursor, stroke width, and many other properties associated with the object whose scaleY is the property.

Option Key

##scaleY - This property accepts numbers value. The assigned value determines the vertical object scale factor. Its default value is 1.

Example 1
Default appearance when scaleY is not used
The following example shows the How the ellipse is displayed when using the
scaleY property. By default, ellipse objects have a vertical scale factor of 1. scaleY Determines the transformation that resizes the object along the Y axis.
<!DOCTYPE html> <html> <head>  <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Setting the vertical scale factor of an Ellipse using FabricJS</h2> <p>Note that here we haven't set the vertical scale factor <b>scaleY</b> explicitly. By default, it is set to 1. </p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); // Initiate an ellipse instance var ellipse = new fabric.Ellipse({ left: 115, top: 50, rx: 80, ry: 50, fill: "#ff1493", }); // Adding it to the canvas canvas.add(ellipse); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); </script> </body> </html>
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Example 2
Passing scaleY attribute as key
In this example, we pass scaleY Attribute as key, value is 2. This means that the scale factor of the ellipse object in the vertical direction is doubled.
<!DOCTYPE html> <html> <head>  <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Setting the vertical scale factor of an Ellipse using FabricJS</h2> <p>Here we have set <b>scaleY</b> to 2, so the vertical scale factor of the ellipse doubled. </p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); // Initiate an ellipse instance var ellipse = new fabric.Ellipse({ left: 115, top: 50, rx: 80, ry: 50, fill: "#ff1493", scaleY: 2, }); // Adding it to the canvas canvas.add(ellipse); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); </script> </body> </html>
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