在本教程中,我們將學習如何使用 FabricJS 建立 Line 物件的字串表示形式。 Line 元素是 FabricJS 中提供的基本元素之一。它用於創建直線。由於線元素在幾何上是一維的並且不包含內部,因此它們永遠不會被填充。我們可以透過建立 fabric.Line 實例來建立線條對象,指定線條的 x 和 y 座標並將其新增至畫布。為了建立 Line 物件的字串表示形式,我們使用 toString 方法。
toString(): String
讓我們看一個程式碼範例,以查看使用toString 方法時記錄的輸出用來。在這種情況下,將傳回線條實例的字串表示形式。
<!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 toString method</h2> <p> You can open console from dev tools and see that the logged output contains the String representation of the line instance </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([200, 100, 100, 40], { stroke: "blue", strokeWidth: 20, }); // Add it to the canvas canvas.add(line); // Using the toString method console.log( "String representation of the Line instance is: ", line.toString() ); </script> </body> </html>
讓我們看一個程式碼範例,看看如何透過查看兩個物件各自的字串表示來比較它們。在這裡,我們初始化了一個線實例和一個矩形實例。在對每個物件套用 toString 方法時,我們可以在控制台中看到它們各自的字串表示形式。
<!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 toString method to compare two different elements</h2> <p> You can open console from dev tools and see that the logged output contains the String representation of the line instance and the rectangle instance </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([200, 100, 100, 40], { stroke: "blue", strokeWidth: 20, }); // Initiate a Rectangle object var rect = new fabric.Rect( { stroke: "red", strokeWidth: 20, width:20, height: 50, left: 400, top: 55 }); // Add them to the canvas canvas.add(line); canvas.add(rect) // Using the toString method console.log( "String representation of the Line instance is: ", line.toString() ); console.log( "String representation of the Rectangle instance is: ", rect.toString() ); </script> </body> </html>
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