javascript - 为什么我不能在 Konva.Shape.fillPatternImage(imageObj) 中使用 Konva.Image()？

Question

以下是来自 Konvajs 的示例加载图像的库:

var imageObj = new Image();
imageObj.onload = function() {

  var yoda = new Konva.Image({
    x: 50,
    y: 50,
    image: imageObj,
    width: 106,
    height: 118
});

  And here is my code

  <div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>  var annotation = new Konva.Line({
    points: this.contour,
    stroke: color,
    closed: true,
    strokeWidth: 1
});
  var nativeImageObject = new Image();
  nativeImageObject.onload = function() {
      var konvaImage = new Konva.Image({
        image: nativeImageObject
    });
      annotation.fillPatternImage(konvaImage);   
          DentalChart.Pattern.customPatternImages.push(customPatternImage);
      gridLayer.add(annotation);
      stage.draw();
  };
  nativeImageObject.src = pattern.toDataURL();
  nativeImageObject.id = patternEnum + '' + color;

  </code></pre>
</div>
</div>

为什么它一直记录未捕获的类型错误:无法在“CanvasRenderingContext2D”上执行“createPattern”:提供的值不是“(HTMLImageElement 或 HTMLVideoElement 或 HTMLCanvasElement 或 ImageBitmap)”类型

  Call Stack Trace:

  console.trace()
  (anonymous function) @ VM11965:1evaluate @ (program):493
  InjectedScript._evaluateOn @ VM11739:875
  InjectedScript._evaluateAndWrap @ VM11739:808InjectedScript.evaluateOnCallFrame @ VM11739:933
  Konva.Context.createPattern @ konva.js:1805Konva.SceneContext._fillPattern @ konva.js:1987
  Konva.SceneContext._fill @ konva.js:2045Konva.Context.fillStrokeShape @ konva.js:1635
  Konva.Line._sceneFunc @ konva.js:12613Konva.Util.addMethods.drawScene @ konva.js:7997
  (anonymous function) @ konva.js:7675Konva.Collection.each @ konva.js:664
  Konva.Util.addMethods._drawChildren @ konva.js:7674
  Konva.Util.addMethods.drawScene @ konva.js:7629
  Konva.Util.addMethods.drawScene @ konva.js:10363
  (anonymous function) @ konva.js:7675
  Konva.Collection.each @ konva.js:664
  Konva.Util.addMethods._drawChildren @ konva.js:7674
  Konva.Util.addMethods.drawScene @ konva.js:7629
  Konva.Util.addMethods.draw @ konva.js:3799
  Konva.Util.addMethods.draw @ konva.js:9337(anonymous function) @ DentalChartLib.js:132DentalChart.Pattern.getCustomPattern.nativeImageObject.onload @ DentalChartLib.js:617
  undefined

Answer 1

对于 fillPatternImage 使用原生 Image 对象。

http://konvajs.github.io/docs/styling/Fill.html