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from ..node import Node
class Anchor(Node):
"""
Anchor is a node derives parts of its transform from some other
coordinate system in the scene.
The purpose is to allow children of an Anchor to draw using a position
(and optionally rotation) specified by one coordinate system, and scaling/
projection specified by another.
For example, text attached to a point in a 3D scene should be drawn in
a coordinate system with a simple relationship to the screen pixels, but
should derive its location from a position within the 3D coordinate
system::
root = Box()
view = ViewBox(parent=box)
plot = LineVisual(parent=ViewBox)
anchor = Anchor(parent=root, anchor_to=plot, anchor_pos=(10, 0))
text = Text(parent=anchor,
text="Always points to (10,0) relative to line.")
"""
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