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motiontrail: Add easier way to call add_vertex()

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Currently, you must pass in a function, which is a little awkward compared to just passing in a position.  Now you can just pass in a vertex position, similar to the C++ interface.
This commit is contained in:
rdb 2022-12-15 17:58:46 +01:00
parent 154223d075
commit 8ab37b8804
1 changed files with 11 additions and 3 deletions
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14
direct/src/motiontrail/MotionTrail.py
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@ -244,7 +244,7 @@ class MotionTrail(NodePath, DirectObject):
return Task.cont return Task.cont
def add_vertex(self, vertex_id, vertex_function, context): def add_vertex(self, vertex_id, vertex_function=None, context=None):
"""This must be called repeatedly to define the polygon that forms the """This must be called repeatedly to define the polygon that forms the
cross-section of the generated motion trail geometry. The first cross-section of the generated motion trail geometry. The first
argument is a user-defined vertex identifier, the second is a function argument is a user-defined vertex identifier, the second is a function
@ -255,8 +255,15 @@ class MotionTrail(NodePath, DirectObject):
After calling this, you must call `update_vertices()` before the After calling this, you must call `update_vertices()` before the
changes will fully take effect. changes will fully take effect.
As of Panda3D 1.10.13, you may alternatively simply pass in a single
argument containing the vertex position as a `.Vec4` or `.Point3`.
""" """
motion_trail_vertex = MotionTrailVertex(vertex_id, vertex_function, context) if vertex_function is None:
motion_trail_vertex = MotionTrailVertex(None, None, context)
motion_trail_vertex.vertex = Vec4(vertex_id)
else:
motion_trail_vertex = MotionTrailVertex(vertex_id, vertex_function, context)
total_vertices = len(self.vertex_list) total_vertices = len(self.vertex_list)
self.vertex_list[total_vertices : total_vertices] = [motion_trail_vertex] self.vertex_list[total_vertices : total_vertices] = [motion_trail_vertex]
@ -308,7 +315,8 @@ class MotionTrail(NodePath, DirectObject):
vertex_index = 0 vertex_index = 0
while vertex_index < total_vertices: while vertex_index < total_vertices:
motion_trail_vertex = self.vertex_list[vertex_index] motion_trail_vertex = self.vertex_list[vertex_index]
motion_trail_vertex.vertex = motion_trail_vertex.vertex_function(motion_trail_vertex, motion_trail_vertex.vertex_id, motion_trail_vertex.context) if motion_trail_vertex.vertex_function is not None:
motion_trail_vertex.vertex = motion_trail_vertex.vertex_function(motion_trail_vertex, motion_trail_vertex.vertex_id, motion_trail_vertex.context)
vertex_index += 1 vertex_index += 1
# calculate v coordinate # calculate v coordinate