toImage method
Capture the current canvas to an image.
Implementation
ui.Image toImage([double? pixelRatio]) {
final ctx = _key.currentContext;
assert(ctx != null);
final boundary = ctx!.findRenderObject() as RenderRepaintBoundary;
pixelRatio ??= MediaQuery.of(ctx).devicePixelRatio;
return boundary.toImageSync(pixelRatio: pixelRatio);
}