在本文中，我們將學習如何使用 FabricJS 僅當物件完全包含在選擇區域中時才啟用物件的選擇。我們可以使用 SelectionFullyContained 屬性來實現此目的。
new fabric.Canvas(element: HTMLElement|String, { selectionFullyContained: Boolean }: Object)# - 此參數是
選項（可選） - 此參數是一個對象，它提供對我們的畫布進行額外的自訂。使用此參數，可以更改與畫布相關的顏色、遊標、邊框寬度和許多其他屬性，其中selectionFullyContained 是一個屬性。它接受一個布林值，該值確定是否僅當物件完全包含在選擇區域中時才應選擇該物件。預設值為 False。
傳遞值為False 的SelectionFullyContained 鍵
##讓我們看一下FabricJS 中預設行為的程式碼範例，即儘管物件未完全包含在選擇區域中，但物件仍被選取。在此範例中，我們將 SelectionFullyContained 的值傳遞為 False。<!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>Enabling selection of an object only when it is fully contained in a selection area</h2>
<p>Select a partial area around the object. The entire object would be selected even if you select a partial area containing the object.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
selectionFullyContained: false
});
// Creating an instance of the fabric.Rect class
var circle = new fabric.Circle({
left: 215,
top: 100,
radius: 50,
fill: "orange",
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>將selectionFullyContained鍵傳遞給值為True的類別
讓我們來看一個程式碼範例，其中selectionFullyContained屬性的值具有已設定為True。正如我們所看到的，只有當物件完全包含在選擇區域中時才會選擇該物件。<!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>Enabling selection of an object only when it is fully contained in a selection area</h2>
<p>Here you cannot select the object by selecting a partial area around the object. The object must be fully contained inside the selection area.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
selectionFullyContained: true
});
// Creating an instance of the fabric.Rect class
var circle = new fabric.Circle({
left: 215,
top: 100,
radius: 50,
fill: "orange"
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>以上是如何僅當物件完全包含在 FabricJS 中的選擇區域中時才啟用物件選擇？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
