从画布html5中的上传图像中删除拖动属性（将区域设置为上传图像）

Question

我正在使用Fabric js在画布中上传图像。 现在它是可拖动的，但是我想删除拖动属性并设置区域以在画布上上传图像。

HTML：

 <script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>
        <canvas id="canvas" width="750" height="550"></canvas>
        <input type="file" id="file">

CSS：

 canvas{
                border: 1px solid black;
            }

JAVA脚本：

 var canvas = new fabric.Canvas('canvas');
            document.getElementById('file').addEventListener("change", function (e) {
                var file = e.target.files[0];
                var reader = new FileReader();
                reader.onload = function (f) {
                    var data = f.target.result;
                    fabric.Image.fromURL(data, function (img) {
                        var oImg = img.set({left: 50, top: 100,width: 250, height: 200, angle: 00}).scale(0.9);
                        canvas.add(oImg).renderAll();
                        var a = canvas.setActiveObject(oImg);
                    });

                };
                reader.readAsDataURL(file);  
                var dataURL = canvas.toDataURL({
                    format: 'png',
                    opacity: 0.9
                });

            });

 var canvas = new fabric.Canvas('canvas'); document.getElementById('file').addEventListener("change", function (e) { var file = e.target.files[0]; var reader = new FileReader(); reader.onload = function (f) { var data = f.target.result; fabric.Image.fromURL(data, function (img) { var oImg = img.set({left: 50, top: 100,width:200,height:200, angle: 00}).scale(0.9); canvas.add(oImg).renderAll(); var a = canvas.setActiveObject(oImg); }); }; reader.readAsDataURL(file); var dataURL = canvas.toDataURL({ format: 'png', opacity: 0.9 }); console.log("Canvas Image " + dataURL); }); 

  canvas{ border: 1px solid black; } 

  <script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script> <canvas id="canvas" width="750" height="550"></canvas> <input type="file" id="file"> 

我只想删除上传图片的拖动属性。

Answer 1

只需锁定

.lockMovementX = true;
.lockMovementY = true;

 var canvas = new fabric.Canvas('canvas'); document.getElementById('file').addEventListener("change", function (e) { var file = e.target.files[0]; var reader = new FileReader(); reader.onload = function (f) { var data = f.target.result; fabric.Image.fromURL(data, function (img) { var oImg = img.set({left: 50, top: 100,width:200,height:200, angle: 00}).scale(0.9); oImg.lockMovementX = true; oImg.lockMovementY = true; canvas.add(oImg); var a = canvas.setActiveObject(oImg); }); }; reader.readAsDataURL(file); var dataURL = canvas.toDataURL({ format: 'png', opacity: 0.9 }); console.log("Canvas Image " + dataURL); }); 

 canvas{ border: 1px solid black; } 

 <script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script> <canvas id="canvas" width="750" height="550"></canvas> <input type="file" id="file">