在本教程中，我們將學習如何使用 FabricJS 來尋找圖像的原始大小。我們可以透過建立fabric.Image的實例來建立一個Image物件。由於它是 FabricJS 的基本元素之一，我們也可以透過應用角度、不透明度等屬性輕鬆自訂它。為了找到圖像的原始大小，我們使用 getOriginalSize 方法。
getOriginalSize(): Object
在這個範例中，我們使用了getOriginalSize方法來取得影像的寬度和高度值。這裡，傳回的寬度和高度值分別是 311 和 82。
<!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 getOriginalSize method</h2>
<p>
You can open the console from dev tools to see that the logged output contains the height and width of the Image
</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<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 getOriginalSize method
console.log(
"The original size of the Image object is: ",
image.getOriginalSize()
);
</script>
</body>
</html>
讓我們來看看當 getOriginalSize 方法與 cropX 屬性結合使用時記錄的輸出的程式碼範例。在這裡，我們將值 50 傳遞給cropX。因此，我們的 Image 物件將在 x 方向上從原始影像大小裁剪 50px。然而，當我們使用getOriginalSize方法時，我們傳回的寬度和高度值分別為311和82，這進一步證明getOriginalSize只會傳回原始大小圖。
<!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 getOriginalSize method along with cropX property</h2>
<p>
You can open the console from dev tools to see that the original size of the image will be returned regardless of having applied image cropping in xdirection
</p>
<canvas id="canvas"></canvas>
<img
src="https://www.tutorialspoint.com/images/logo.png"
id="img1"
style="display: none"
/>
<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,
cropX: 50,
});
// Add it to the canvas
canvas.add(image);
// Using the getOriginalSize method
console.log(
"The original size of the Image object is: ",
image.getOriginalSize()
);
</script>
</body>
</html>
以上是如何使用 FabricJS 來尋找影像的原始大小？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
