Коммит f4743475 создал по автору Ilya Portnov's avatar Ilya Portnov
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Some documentation.

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utils/curve/nurbs_algorithms.py
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...@@ -697,6 +697,20 @@ def move_curve_point_by_moving_control_point(curve, u_bar, k, vector): ...@@ -697,6 +697,20 @@ def move_curve_point_by_moving_control_point(curve, u_bar, k, vector):
return curve.copy(control_points = cpts) return curve.copy(control_points = cpts)
def move_curve_point_by_adjusting_one_weight(curve, u_bar, k, distance): def move_curve_point_by_adjusting_one_weight(curve, u_bar, k, distance):
"""
Adjust the given curve so that curve's point at parameter u_bar is moved
by given distance towards (or away from) k'th control point.
See The NURBS Book, 2nd ed, p.11.3.1.
Parameters:
* curve - the curve to be adjusted
* u_bar - curve's parameter, point at which is to be moved
* k - index of curve's weight, which is to be changed
* distance - the distance to move the point by. If > 0,
then the point is moved towards the corresponding control point;
otherwise, the point is moved away from it.
"""
p = curve.get_degree() p = curve.get_degree()
weights = curve.get_weights().copy() weights = curve.get_weights().copy()
pt = curve.evaluate(u_bar) pt = curve.evaluate(u_bar)
...@@ -711,6 +725,23 @@ def move_curve_point_by_adjusting_one_weight(curve, u_bar, k, distance): ...@@ -711,6 +725,23 @@ def move_curve_point_by_adjusting_one_weight(curve, u_bar, k, distance):
return curve.copy(weights = weights) return curve.copy(weights = weights)
def move_curve_point_by_adjusting_two_weights(curve, u_bar, k, distance=None, scale=None): def move_curve_point_by_adjusting_two_weights(curve, u_bar, k, distance=None, scale=None):
"""
Adjust the given curve so that curve's point at parameter u_bar is moved towards
(or away from) curve's control polygon leg P[k] - P[k+1].
If distance is specified, then the point is moved by given distance. Distance > 0
indicates movement towards curve's control polygon leg. Note that if you try to
move the point farther than curve's control polygon leg, this method will produce
some fancy curve.
If scale is specified, then the distance will be calculated automatically, so that:
* scale = 0 means do not move anything;
* scale = 1.0 means move the point all the way to control polygon leg, making a small
fragment of the curve a straight line;
* scale = -1.0 means move the point all the way from control polygon leg, making a larger
fragment of the curve a straight line.
Of distance and scale, exactly one parameter must be provided.
See The NURBS Book, 2nd ed., p.11.3.2.
"""
if distance is None and scale is None: if distance is None and scale is None:
raise Exception("Either distance or scale must be specified") raise Exception("Either distance or scale must be specified")
......
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