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Fabric.js Image backgroundColor屬性用法及代碼示例


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。