Am 19.04.21 um 21:42 schrieb messias.phys...@gmail.com:
I have the same question as Davide Cittaro.
I'm trying to create the same plot got from minimize_nested_blockmodel_dl and
draw_hyerarch, but using the threejs
(https://threejs.org/docs/?q=curve#api/in/extras/curves/Quadratic Bezier Curve)
I'm using this code to extract the control points
```
state = gt.inference.minimize.minimize_nested_blockmodel_dl(g)
pos, t, tpos = state.draw(**options)
cts = gt.draw.get_hierarchy_control_points(g, t, tpos)
```
However I couldn't get how the control points are enconded in the cts ds.
For example, a sinlge instance of cts object I have this
print(list(cts)[100] )
[0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.03 0.09
0.05 0.18 0.11 0.36 0.17 0.48 0.23 0.61 0.3 0.69 0.36 0.84 0.42 0.99
0.46 1.21 0.5 1.23 0.55 1.25 0.6 1.06 0.65 0.87 0.7 0.69 0.75 0.5
0.81 0.35 0.87 0.21 0.93 0.1 0.97 0.05 1. 0. 1. 0. 1. 0.
1. 0. 1. 0. 1. 0. ]
What's the meaning of the first 12 elements? How (x,y) for control points are
encoded?
From the documentation of graph_draw():
control_points: Control points of a Bézier spline used to draw the
edge. Each spline segment requires 6 values corresponding to the
(x,y) coordinates of the two intermediary control points and the
final point.
In the coordinate system, (0,0) is the start of the edge, and (1, 0) is
the end of the edge. The last point at (1,0) is always assumed, even if
not given.
(Note that the get_hierarchy_control_points() is wasteful, since it
includes duplicated points in the beginning and end. This is an outcome
of the translation between B-splines, used internally, and the Bezier
splines that are used for drawing. This is something I intended to fix,
but it seems I forgot.)
Best,
Tiago
--
Tiago de Paula Peixoto
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