在本教程中，我們將學習如何使用FabricJS來尋找影像的物件比例因子。我們可以透過建立fabric.Image的實例來建立一個映像物件。由於它是FabricJS的基本元素之一，我們也可以透過應用諸如角度、不透明度等屬性來輕鬆自訂它。為了找到影像的物件比例因子，我們使用getTotalObjectScaling方法。
getTotalObjectScaling(): Object
在這個例子中，我們使用了getTotalObjectScaling方法來取得影像的物件縮放因子。在這種情況下，記錄的輸出分別為scaleX和scaleY約為1.5。
<!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 getTotalObjectScaling method</h2>
<p>
You can open the console from dev tools to see that the logged output
contains the object scale factor
</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找到影像的物件比例因子？" >
<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,
skewX: 15,
});
// Add it to the canvas
canvas.add(image);
// Using the getTotalObjectScaling method
console.log(
"The scale factor of the Image object is: ",
image.getTotalObjectScaling()
);
</script>
</body>
</html>
讓我們來看一個程式碼範例，當使用getTotalObjectScaling方法與scaleX屬性一起使用時，輸出的日誌如何。在這裡，我們將scaleX屬性的值設為2。因此，日誌輸出顯示scaleX的值約為3，而scaleY的值保持不變。
<!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 getTotalObjectScaling method along with scaleX property</h2>
<p>
You can open the console from dev tools to see that the logged output contains the object scale factor
</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找到影像的物件比例因子？" >
<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,
skewX: 15,
scaleX: 2,
});
// Add it to the canvas
canvas.add(image);
// Using the getTotalObjectScaling method
console.log(
"The scale factor of the Image object is: ",
image.getTotalObjectScaling()
);
</script>
</body>
</html>
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