Function corner_resize_grip 

pub fn corner_resize_grip(
    scene: &mut Scene,
    transform: Affine,
    grip: Rect,
    anchor: (bool, bool),
    color: AlphaColor<Srgb>,
)

The resize handle in a resizable surface’s free corner: three short diagonal strokes hugging the corner of grip that anchor names (true for the left, top edge), in color.