在本教程中，我们将学习如何使用FabricJS查找图像的对象比例因子。我们可以通过创建fabric.Image的实例来创建一个图像对象。由于它是FabricJS的基本元素之一，我们还可以通过应用诸如角度、不透明度等属性来轻松自定义它。为了找到图像的对象比例因子，我们使用getTotalObjectScaling方法。
getTotalObjectScaling(): Object
在这个例子中，我们使用了getTotalObjectScaling方法来获取图像的对象缩放因子。在这种情况下，记录的输出分别为scaleX和scaleY约为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找到图像的对象比例因子？" >
<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>
让我们来看一个代码示例，当使用getTotalObjectScaling方法与scaleX属性一起使用时，输出的日志如何。在这里，我们将scaleX属性的值设为2。因此，日志输出显示scaleX的值约为3，而scaleY的值保持不变。
<!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找到图像的对象比例因子？" >
<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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