canvas property

CanvasElement canvas

Implementation

CanvasElement get canvas {
  if (_source is CanvasElement) {
    return _source as CanvasElement;
  } else if (_source is ImageElement) {
    final imageElement = _source as ImageElement;
    _canvas = _source = CanvasElement(width: _width, height: _height);
    _canvas!.context2D.drawImageScaled(imageElement, 0, 0, _width, _height);
    return _canvas!;
  } else if (_source is ImageBitmap) {
    final image = _source as ImageBitmap;
    _canvas = _source = CanvasElement(width: _width, height: _height);

    // Note: We need to use js_util.callMethod, because Dart SDK
    // does not support ImageBitmap as a CanvasImageSource
    js_util.callMethod(_canvas!.context2D, 'drawImage', [
      image,
      0,
      0,
      _width,
      _height,
    ]);

    return _canvas!;
  } else {
    throw StateError('RenderTexture is read only.');
  }
}