effectiveTransformMatrix property

Implementation

@override
Matrix4 get effectiveTransformMatrix {
  assert(hasRenderBox());
  // Make sure it is used after renderBoxModel been created.
  final Matrix4 result = Matrix4.identity();
  result.translateByDouble(transformOffset.dx, transformOffset.dy, 0.0, 1.0);
  late Offset translation;
  if (transformAlignment != Alignment.topLeft) {
    // Use boxSize instead of size to avoid Flutter cannot access size beyond parent access warning
    translation = transformAlignment.alongSize(boxSize()!);
    // translation =
    result.translateByDouble(translation.dx, translation.dy, 0.0, 1.0);
  }

  if (transformMatrix != null) {
    result.multiply(transformMatrix!);
  }

  if (transformAlignment != Alignment.topLeft) {
    result.translateByDouble(-translation.dx, -translation.dy, 0.0, 1.0);
  }

  result.translateByDouble(-transformOffset.dx, -transformOffset.dy, 0.0, 1.0);

  assert(result.storage.every((double component) => component.isFinite));
  return result;
}