Fabric.js是一個JavaScript庫,用於處理畫布。圖像是用於創建圖像實例的fabric.js類之一。圖像的backgroundColor屬性用於設置圖像的背景色。
方法:首先導入fabric.js庫。導入庫後,在body標簽中創建一個畫布塊,其中將包含圖像。之後,初始化由Fabric.JS提供的Canvas和圖像類的實例,並使用圖像對象的backgroundColor屬性設置圖像的背景色。
用法:
fabric.Image(image, { backgroundColor:"string" });
參數:上麵的函數采用上麵提到的和下麵描述的兩個參數:
- image:此參數保存圖像。
- backgroundColor:這將設置圖像的背景色。
範例1:本示例使用FabricJS設置畫布圖像的背景顏色,如下麵的示例所示。
<!DOCTYPE html>
<html>
<head>
<!-- Adding the FabricJS library -->
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js">
</script>
</head>
<body>
<h1 style="color:green;">GeeksforGeeks</h1>
<b>Fabric.js | Image backgroundColor Property </b>
<canvas id="canvas" width="400" height="300"
style="border:2px solid #000000">
</canvas>
<img src =
"https://media.geeksforgeeks.org/wp-content/uploads/20200327230544/g4gicon.png"
width="100"
height="100"
id="my-image">
<script>
// Create the instance of canvas object
var canvas = new fabric.Canvas("canvas");
var img= document.getElementById('my-image');
var imgInstance = new fabric.Image(img, {
opacity:0.8,
backgroundColor:"yellow"
});
canvas.add(imgInstance);
</script>
</body>
</html>
輸出:
範例2:
HTML
<!DOCTYPE html>
<html>
<head>
<!-- Adding the FabricJS library -->
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js">
</script>
</head>
<body>
<h1 style="color:green;">GeeksforGeeks</h1>
<b>Fabric.js | Image backgroundColor Property </b>
<canvas id="canvas" width="300" height="200"
style="border:2px solid #000000">
</canvas>
<img src =
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_200X200-1.png"
width="100"
height="100"
id="my-image"
style="display:none">
<br>
<button onclick="func()">Clickme</button>
<script>
// Create the instance of canvas object
var canvas = new fabric.Canvas("canvas");
var img= document.getElementById('my-image');
var imgInstance = new fabric.Image(img, {
});
canvas.add(imgInstance);
func=()=>{
// Create the instance of canvas object
var canvas = new fabric.Canvas("canvas");
var img= document.getElementById('my-image');
var imgInstance = new fabric.Image(img, {
opacity:0.4,
backgroundColor:"green"
});
canvas.clear();
canvas.add(imgInstance);
}
</script>
</body>
</html>
輸出:
- 在點擊clickme按鈕之前:
- 單擊clickme按鈕後:
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注:本文由純淨天空篩選整理自tarun007大神的英文原創作品 Fabric.js Image backgroundColor Property。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。