使用 FabricJS 向 Polygon 對(duì)象添加收縮和展開(kāi)動(dòng)畫(huà)-魔扣目錄

我們可以通過(guò)創(chuàng)建fabric.Polygon的實(shí)例來(lái)創(chuàng)建一個(gè)Polygon對(duì)象。多邊形對(duì)象的特征可以是由一組連接的直線段組成的任何閉合形狀。由于它是 FabricJS 的基本元素之一，我們還可以通過(guò)應(yīng)用角度、不透明度等屬性輕松自定義它。為了添加收縮和展開(kāi)動(dòng)畫(huà)，我們可以使用 scaleX 和 scaleY 屬性與 animate 方法結(jié)合使用。

語(yǔ)法

animate(property: String | Object, value: Number | Object):
fabric.Object | fabric.AnimationContext |
Array.<fabric.AnimationContext>

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參數(shù)

property – 該屬性接受一個(gè)String或Object值來(lái)確定我們想要哪些屬性制作動(dòng)畫(huà)。

value – 此屬性接受 Number 或 Object 值，用于確定要設(shè)置動(dòng)畫(huà)的值特性。

選項(xiàng)鍵

scaleX：此屬性接受 Number 值。分配的值決定水平對(duì)象比例因子。它的默認(rèn)值為 1。

scaleY：此屬性接受 Number 值。分配的值決定垂直對(duì)象比例因子。它的默認(rèn)值為 1。

示例1：為多邊形添加收縮動(dòng)畫(huà)

讓我們看一個(gè)代碼示例，看看如何使用 animate 方法添加收縮動(dòng)畫(huà)。我們向scaleX和scaleY屬性傳遞一個(gè)值0.5，這使得多邊形從水平和垂直方向都是原始大小的一半。

<!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>Adding shrink animation to the polygon</h2>
   <p>You can see that shrink animation has been added to the polygon</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 polygon object
      var polygon = new fabric.Polygon(
         [
            { x: 60, y: 0 },
            { x: 60, y: 60 },
            { x: 0, y: 60 },
            { x: 0, y: 0 },
         ],
         {
            fill: "#ffe4e1",
            stroke: "green",
            strokeWidth: 5,
            top: 90,
            left: 100,
         }
      );
      
      // Adding it to the canvas
      canvas.add(polygon);
      
      // Using the animate method and passing scaleX property
      polygon.animate("scaleX", "0.5", {
         onChange: canvas.renderAll.bind(canvas),
         easing: fabric.util.ease.easeInCubic,
         duration: 1000,
      });
      
      // Using the animate method and passing scaleY property
      polygon.animate("scaleY", "0.5", {
         onChange: canvas.renderAll.bind(canvas),
         easing: fabric.util.ease.easeInCubic,
         duration: 1000,
      });
   </script>
 </body>
</html>

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示例 2：向多邊形添加展開(kāi)動(dòng)畫(huà)

在此示例中，我們將了解如何使用 animate 方法添加 expand 動(dòng)畫(huà)。由于我們向scaleX和scaleY屬性傳遞的值為1.5，因此多邊形對(duì)象將在水平和垂直方向上縮放1.5倍。

<!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>Adding expand animation to the polygon</h2>
   <p>You can see that expand animation has been added to the polygon</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 polygon object
      var polygon = new fabric.Polygon(
         [
            { x: 60, y: 0 },
            { x: 60, y: 60 },
            { x: 0, y: 60 },
            { x: 0, y: 0 },
         ],
         {
            fill: "#ffe4e1",
            stroke: "green",
            strokeWidth: 5,
            top: 90,
            left: 100,
         }
      );
      
      // Adding it to the canvas
      canvas.add(polygon);
      
      // Using the animate method and passing scaleX property
      polygon.animate("scaleX", "1.5", {
         onChange: canvas.renderAll.bind(canvas),
         easing: fabric.util.ease.easeInCubic,
         duration: 1000,
      });
      
      // Using the animate method and passing scaleY property
      polygon.animate("scaleY", "1.5", {
         onChange: canvas.renderAll.bind(canvas),
         easing: fabric.util.ease.easeInCubic,
         duration: 1000,
      });
   </script>
</body>
</html>

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