在本教程中，我們將學習如何使用FabricJS來取得文字的縮放高度。我們可以透過新增fabric.Text的實例來在畫布上顯示文字。它不僅允許我們移動、縮放和改變文字的尺寸，還提供了其他功能，如文字對齊、文字裝飾、行高，可以透過屬性textAlign、underline和lineHeight分別獲得。我們也可以使用getScaledHeight方法來找到物件的縮放高度。
getScaledHeight()
使用getScaledHeight方法
讓我們看一個程式碼範例，以查看使用getScaledHeight方法時記錄的輸出。在這種情況下，將會傳回物件的高度。
<!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 getScaledHeight method</h2>
<p>You can open console from dev tools and see that the height value is being displayed in the console</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 text object
var text = new fabric.Text("Add sampletext here", {
width: 300,
fill: "green",
fontWeight: "bold",
});
// Add it to the canvas
canvas.add(text);
// Using getScaledHeight method
console.log("The scaled height is", text.getScaledHeight());
</script>
</body>
</html>
使用getScaledHeight方法並傳遞scaleY屬性
Let’s see a code example to see the logged output when the getScaledHeight method is used in conjunction with the scaleY property. In this case, final scaled height will be displayed in#sole.
<!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 getScaledHeight method and passing the scaleY property</h2>
<p>You can open console from dev tools and see that the height value is being displayed in the console has increased </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 text object
var text = new fabric.Text("Add sampletext here", {
width: 300,
fill: "green",
fontWeight: "bold",
scaleY: 2,
});
// Add it to the canvas
canvas.add(text);
// Using getScaledHeight method
console.log("The scaled height is", text.getScaledHeight());
</script>
</body>
</html>
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