如何在 FabricJS 中优化显示和与大型 svg 图像的交互而不会出现延迟

How to optimize display & interactive with large svg image without Lag in FabricJS

我有一个带有一些大 svg 文件的 fabricJS 编辑器,因此,当我在编辑器上与(移动/拖动)项目交互时,我填充它非常滞后和沉重。
如何通过 fabricJS 优化使用大型 svg 文件?

这是我的代码:

var canvas;

var canvasObject = document.getElementById("editorCanvas");

// set canvas equal size with div
$(canvasObject).width($("#canvasContainer").width());
$(canvasObject).height($("#canvasContainer").height());

canvas = new fabric.Canvas('editorCanvas', {
  backgroundColor: 'white',
  selectionLineWidth: 2,
  width: $("#canvasContainer").width(),
  height: $("#canvasContainer").height()
});

for (var i = 0; i < 4; i++) {

  var bigImage = new fabric.Image();
  bigImage.left = 10 * (i + 1);
  bigImage.top = 10 * (i + 1);
  bigImage["objectCaching"] = true;
  canvas.add(bigImage);
  bigImage.setSrc('https://futushigame.firebaseapp.com/big_image/big_image_' + (i + 1) + '.svg', function(imageObject) {
    imageObject.set('dirty', true);
    canvas.renderAll();
    setObjectCoords();
  });

}

function setObjectCoords() {
  canvas.forEachObject(function(object) {
    object.setCoords();
  });
}
#canvasContainer {
  width: 100%;
  height: 100vh;
  background-color: gray;
}
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/2.4.3/fabric.js"></script>

<div id="canvasContainer">
  <canvas id="editorCanvas"></canvas>
</div>


拖动项目填充沉重且滞后

您可以从 fabric.Image class 改写 needsItsOwnCache

var canvasObject = document.getElementById("editorCanvas");

// set canvas equal size with div
$(canvasObject).width($("#canvasContainer").width());
$(canvasObject).height($("#canvasContainer").height());

canvas = new fabric.Canvas('editorCanvas', {
  backgroundColor: 'white',
  selectionLineWidth: 2,
  width: $("#canvasContainer").width(),
  height: $("#canvasContainer").height()
});

for (var i = 0; i < 4; i++) {

  var bigImage = new fabric.Image();
  bigImage.left = 10 * (i + 1);
  bigImage.top = 10 * (i + 1);
  //    bigImage["objectCaching"] = true;
  bigImage["ownCaching"] = true;
  //  bigImage["clipPath"] = [];
  canvas.add(bigImage);
  bigImage.setSrc('https://futushigame.firebaseapp.com/big_image/big_image_' + (i + 1) + '.svg', function(imageObject) {
    //imageObject.set('dirty', true);
    canvas.renderAll();
    setObjectCoords();
  });

}

function setObjectCoords() {
  canvas.forEachObject(function(object) {
    object.setCoords();
  });
}

fabric.Image.prototype.needsItsOwnCache = function() {
  return true
}
#canvasContainer {
  width: 100%;
  height: 100vh;
  background-color: gray;
}
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/2.4.3/fabric.js"></script>

<div id="canvasContainer">
  <canvas id="editorCanvas"></canvas>
</div>