在本教程中,我们将学习如何查找 Image 实例的复杂度 使用 FabricJS。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,我们也可以轻松地自定义它 应用角度、不透明度等属性。为了找到图像的复杂度 例如,我们使用复杂性方法。如果当前对象是此方法将返回 1 直接从基类继承,而不是从子类继承。
complexity(): Number
让我们看一个代码示例,看看使用complexity方法时记录的输出 获取 Image 实例的复杂度。除非进行子分类,否则复杂度为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 complexity method</h2> <p>You can open console from dev tools and see the logged output</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <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 the complexity method console.log("The complexity of Image instance is: ", image.complexity()); </script> </body> </html>
在此示例中,我们使用了复杂度方法来比较 图像实例和多边形实例。您可以从开发工具打开控制台 看到复杂性是不同的。
<!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 complexity method to compare different objects</h2> <p>You can open console from dev tools and see the logged output</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <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: 50, }); // Initiate a Polygon object var polygon = new fabric.Polyline( [ { x: 50, y: 30 }, { x: 105, y: 10 }, { x: 160, y: 30 }, { x: 100, y: 150 }, ], { fill: "red", left: 450, top: 70, } ); // Add them both to the canvas canvas.add(image); canvas.add(polygon); // Using the complexity method console.log("The complexity of Image instance is: ", image.complexity()); console.log( "The complexity of Polygon instance is: ", polygon.complexity() ); </script> </body> </html>
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