drawImage 方法

void drawImage(
  1. dynamic image,
  2. num sx_OR_x,
  3. num sy_OR_y,
  4. ?num sw_OR_width,
  5. ?num height_OR_sh,
  6. ?num dx,
  7. ?num dy,
  8. ?num dw,
  9. ?num dh]
)

实现

void drawImage(/*CanvasImageSource*/ image, num sx_OR_x, num sy_OR_y,
    [num? sw_OR_width,
    num? height_OR_sh,
    num? dx,
    num? dy,
    num? dw,
    num? dh]) native;