PCanvas constructor
      
      PCanvas(
    
    
- int width,
- int height,
- PCanvasPainter painter, {
- PCanvasPixels? initialPixels,
Implementation
factory PCanvas(int width, int height, PCanvasPainter painter,
    {PCanvasPixels? initialPixels}) {
  return PCanvasFactory()
      .createPCanvas(width, height, painter, initialPixels: initialPixels);
}