在本教程中,我们将学习如何使用FabricJS查找图像的对象比例因子。我们可以通过创建fabric.Image的实例来创建一个图像对象。由于它是FabricJS的基本元素之一,我们还可以通过应用诸如角度、不透明度等属性来轻松自定义它。为了找到图像的对象比例因子,我们使用getTotalObjectScaling方法。
getTotalObjectScaling(): Object
在这个例子中,我们使用了getTotalObjectScaling方法来获取图像的对象缩放因子。在这种情况下,记录的输出分别为scaleX和scaleY约为1.5。
<!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>Using the getTotalObjectScaling method</h2> <p> You can open the console from dev tools to see that the logged output contains the object scale factor </p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="max-width:90%" / alt="如何使用FabricJS找到图像的对象比例因子?" > <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiating the image element var imageElement = document.getElementById("img1"); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, skewX: 15, }); // Add it to the canvas canvas.add(image); // Using the getTotalObjectScaling method console.log( "The scale factor of the Image object is: ", image.getTotalObjectScaling() ); </script> </body> </html>
让我们来看一个代码示例,当使用getTotalObjectScaling方法与scaleX属性一起使用时,输出的日志如何。在这里,我们将scaleX属性的值设为2。因此,日志输出显示scaleX的值约为3,而scaleY的值保持不变。
<!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>Using the getTotalObjectScaling method along with scaleX property</h2> <p> You can open the console from dev tools to see that the logged output contains the object scale factor </p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="max-width:90%" / alt="如何使用FabricJS找到图像的对象比例因子?" > <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiating the image element var imageElement = document.getElementById("img1"); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, skewX: 15, scaleX: 2, }); // Add it to the canvas canvas.add(image); // Using the getTotalObjectScaling method console.log( "The scale factor of the Image object is: ", image.getTotalObjectScaling() ); </script> </body> </html>
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