在本教程中,我们将学习如何使用 FabricJS 查找线条的复杂度。 Line 元素是 FabricJS 中提供的基本元素之一。它用于创建直线。由于线元素在几何上是一维的并且不包含内部,因此它们永远不会被填充。我们可以通过创建 fabric.Line 的实例来创建线条对象,指定线条的 x 和 y 坐标并将其添加到画布中。为了获得 Line 对象的复杂度,我们使用复杂度方法。如果当前对象直接继承自基类而不是子类,则此方法将返回 1。
complexity(): Number
让我们看一个代码示例,以查看使用复杂性方法获取 Line 实例的复杂性时记录的输出。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> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiate a Line object var line = new fabric.Line([70, 100, 150, 200], { stroke: "blue", }); // Add it to the canvas canvas.add(line); // Using the complexity method console.log("The complexity of Line instance is: ", line.complexity()); </script> </body> </html>
在此示例中,我们使用复杂度方法来比较线实例和多边形实例的复杂度。您可以从开发工具打开控制台来查看复杂度的不同。
<!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 that the complexities are different </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 Line object var line = new fabric.Line([70, 100, 150, 200], { stroke: "blue", }); // 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: 300, top: 70, } ); // Add both to the canvas canvas.add(line); canvas.add(polygon); // Using the complexity method console.log("The complexity of Line instance is: ", line.complexity()); console.log( "The complexity of Polygon instance is: ", polygon.complexity() ); </script> </body> </html>
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