在本教程中,我们将学习如何使用 FabricJS 获取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Image对象。由于它是 FabricJS 的基本元素之一,我们还可以通过应用角度、不透明度等属性轻松自定义它。为了获取 Image 的对象比例因子,我们使用 getObjectScaling 方法。
getObjectScaling(): Object
让我们看一个代码示例,以查看使用 getObjectScaling 方法时记录的输出。在这种情况下,控制台中将显示默认的scaleX和scaleY值为1。
<!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 getObjectscaling method</h2> <p> You can open console from dev tools and see that the logged value is being displayed in the console </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获取Image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, }); // Add it to the canvas canvas.add(image); // Using getObjectScaling method console.log("The scale factor is", image.getObjectScaling()); </script> </body> </html>
让我们看一个代码示例,以查看当 getObjectScaling 方法与 scaleX 属性结合使用时记录的输出。在这种情况下,图像对象的scaleX值将显示为2,而scaleY值将保持不变。
<!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 getObjectScaling method and passing the scaleX property</h2> <p> You can open console from dev tools and see that the logged value is being displayed in the console </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获取Image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, scaleX: 2, }); // Add it to the canvas canvas.add(image); // Using getObjectScaling method console.log("The scale factor is", image.getObjectScaling()); </script> </body> </html>
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