transform method

void transform({
  1. required Matrix4 transform,
  2. required VoidCallback paint,
  3. Offset offset = Offset.zero,
  4. Rect? bounds,
  5. LayerKey<Layer>? key,
})

Pushes an TransformLayer to the compositing tree, calling paint to paint on top of the layer.

The bounds argument defines the bounds in which the paint should paint, this is useful for debugging tools and does not affect rendering.

See also:

Implementation

void transform({
  required Matrix4 transform,
  required VoidCallback paint,
  Offset offset = Offset.zero,
  Rect? bounds,
  LayerKey? key,
}) {
  final layerOffset = _render.paintOffset! + offset;
  TransformLayer layer;
  if (key?.layer is TransformLayer) {
    layer = (key!.layer! as TransformLayer)
      ..transform = transform
      ..offset = layerOffset;
  } else {
    layer = TransformLayer(
      transform: transform,
      offset: layerOffset,
    );
    key?.layer = layer;
  }
  push(
      layer: layer,
      paint: paint,
      offset: -_render.paintOffset!,
      bounds: bounds);
}