Creates a render object that transforms its child.
The transform argument must not be null.
Source
RenderTransform({
Matrix4 transform,
Offset origin,
FractionalOffset alignment,
this.transformHitTests: true,
RenderBox child
}) : super(child) {
assert(transform != null);
assert(alignment == null || (alignment.dx != null && alignment.dy != null));
this.transform = transform;
this.alignment = alignment;
this.origin = origin;
}