747 lines
28 KiB
Python
747 lines
28 KiB
Python
from panda3d.core import *
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from panda3d.direct import *
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from direct.task import Task
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from direct.task.TaskManagerGlobal import taskMgr
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from direct.showbase.DirectObject import DirectObject
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from direct.directnotify.DirectNotifyGlobal import directNotify
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import warnings
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def remove_task():
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if MotionTrail.task_added:
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total_motion_trails = len(MotionTrail.motion_trail_list)
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if total_motion_trails > 0:
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if __debug__:
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warnings.warn("%d motion trails still exist when motion trail task is removed" % (total_motion_trails), RuntimeWarning, stacklevel=2)
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MotionTrail.motion_trail_list = []
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taskMgr.remove(MotionTrail.motion_trail_task_name)
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print("MotionTrail task removed")
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MotionTrail.task_added = False
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class MotionTrailVertex:
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def __init__(self, vertex_id, vertex_function, context):
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self.vertex_id = vertex_id
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self.vertex_function = vertex_function
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self.context = context
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self.vertex = Vec4(0.0, 0.0, 0.0, 1.0)
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# default
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self.start_color = Vec4(1.0, 1.0, 1.0, 1.0)
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self.end_color = Vec4(0.0, 0.0, 0.0, 1.0)
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self.v = 0.0
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class MotionTrailFrame:
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def __init__(self, current_time, transform):
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self.time = current_time
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self.transform = transform
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class MotionTrail(NodePath, DirectObject):
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notify = directNotify.newCategory("MotionTrail")
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task_added = False
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motion_trail_list = []
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motion_trail_task_name = "motion_trail_task"
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global_enable = True
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@classmethod
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def setGlobalEnable(cls, enable):
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cls.global_enable = enable
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def __init__(self, name, parent_node_path):
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NodePath.__init__(self, name)
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# required initialization
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self.active = True
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self.enable = True
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self.pause = False
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self.pause_time = 0.0
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self.fade = False
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self.fade_end = False
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self.fade_start_time = 0.0
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self.fade_color_scale = 1.0
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self.total_vertices = 0
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self.last_update_time = 0.0
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self.texture = None
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self.vertex_list = []
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self.frame_list = []
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self.parent_node_path = parent_node_path
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self.previous_matrix = None
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self.calculate_relative_matrix = False
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self.playing = False
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# default options
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self.continuous_motion_trail = True
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self.color_scale = 1.0
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self.time_window = 1.0
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self.sampling_time = 0.0
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self.square_t = True
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# self.task_transform = False
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self.root_node_path = None
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# node path states
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self.reparentTo(parent_node_path)
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self.geom_node = GeomNode("motion_trail")
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self.geom_node_path = self.attachNewNode(self.geom_node)
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node_path = self.geom_node_path
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### set render states
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node_path.setTwoSided(True)
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# set additive blend effects
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node_path.setTransparency(True)
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node_path.setDepthWrite(False)
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node_path.node().setAttrib(ColorBlendAttrib.make(ColorBlendAttrib.MAdd))
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# do not light
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node_path.setLightOff()
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# disable writes to destination alpha, write out rgb colors only
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node_path.setAttrib(ColorWriteAttrib.make(ColorWriteAttrib.CRed | ColorWriteAttrib.CGreen | ColorWriteAttrib.CBlue))
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if not MotionTrail.task_added:
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#taskMgr.add(self.motion_trail_task, "motion_trail_task", priority = 50)
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taskMgr.add(self.motion_trail_task, MotionTrail.motion_trail_task_name)
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self.acceptOnce("clientLogout", remove_task)
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MotionTrail.task_added = True
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self.relative_to_render = False
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self.use_nurbs = False
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self.resolution_distance = 0.5
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self.cmotion_trail = CMotionTrail()
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self.cmotion_trail.setGeomNode(self.geom_node)
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self.modified_vertices = True
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if base.config.GetBool('want-python-motion-trails', 0):
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self.use_python_version = True
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else:
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self.use_python_version = False
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return
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def delete(self):
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self.reset_motion_trail()
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self.reset_motion_trail_geometry()
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self.cmotion_trail.resetVertexList()
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self.removeNode()
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return
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def print_matrix(self, matrix):
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separator = ' '
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print(matrix.getCell(0, 0), separator, matrix.getCell(0, 1), separator, matrix.getCell(0, 2), separator, matrix.getCell(0, 3))
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print(matrix.getCell(1, 0), separator, matrix.getCell(1, 1), separator, matrix.getCell(1, 2), separator, matrix.getCell(1, 3))
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print(matrix.getCell(2, 0), separator, matrix.getCell(2, 1), separator, matrix.getCell(2, 2), separator, matrix.getCell(2, 3))
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print(matrix.getCell(3, 0), separator, matrix.getCell(3, 1), separator, matrix.getCell(3, 2), separator, matrix.getCell(3, 3))
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def motion_trail_task(self, task):
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current_time = task.time
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total_motion_trails = len(MotionTrail.motion_trail_list)
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index = 0
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while index < total_motion_trails:
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motion_trail = MotionTrail.motion_trail_list [index]
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if MotionTrail.global_enable:
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if motion_trail.use_python_version:
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# Python version
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if motion_trail.active and motion_trail.check_for_update(current_time):
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transform = None
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if motion_trail.root_node_path is not None and motion_trail.root_node_path != render:
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motion_trail.root_node_path.update()
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if motion_trail.root_node_path and not motion_trail.relative_to_render:
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transform = motion_trail.getMat(motion_trail.root_node_path)
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else:
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transform = Mat4(motion_trail.getNetTransform().getMat())
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if transform is not None:
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motion_trail.update_motion_trail(current_time, transform)
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else:
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# C++ version
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if motion_trail.active and motion_trail.cmotion_trail.checkForUpdate(current_time):
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transform = None
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if motion_trail.root_node_path is not None and motion_trail.root_node_path != render:
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motion_trail.root_node_path.update()
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if motion_trail.root_node_path and not motion_trail.relative_to_render:
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transform = motion_trail.getMat(motion_trail.root_node_path)
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else:
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transform = Mat4(motion_trail.getNetTransform().getMat())
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if transform is not None:
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motion_trail.transferVertices()
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motion_trail.cmotion_trail.updateMotionTrail(current_time, transform)
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else:
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motion_trail.reset_motion_trail()
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motion_trail.reset_motion_trail_geometry()
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index += 1
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return Task.cont
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def add_vertex(self, vertex_id, vertex_function, context):
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motion_trail_vertex = MotionTrailVertex(vertex_id, vertex_function, context)
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total_vertices = len(self.vertex_list)
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self.vertex_list [total_vertices : total_vertices] = [motion_trail_vertex]
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self.total_vertices = len(self.vertex_list)
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self.modified_vertices = True
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return motion_trail_vertex
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def set_vertex_color(self, vertex_id, start_color, end_color):
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if vertex_id >= 0 and vertex_id < self.total_vertices:
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motion_trail_vertex = self.vertex_list [vertex_id]
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motion_trail_vertex.start_color = start_color
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motion_trail_vertex.end_color = end_color
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self.modified_vertices = True
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return
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def set_texture(self, texture):
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self.texture = texture
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if texture:
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self.geom_node_path.setTexture(texture)
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# texture.setWrapU(Texture.WMClamp)
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# texture.setWrapV(Texture.WMClamp)
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else:
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self.geom_node_path.clearTexture()
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self.modified_vertices = True
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return
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def update_vertices(self):
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total_vertices = len(self.vertex_list)
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self.total_vertices = total_vertices
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if total_vertices >= 2:
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vertex_index = 0
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while vertex_index < total_vertices:
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motion_trail_vertex = self.vertex_list [vertex_index]
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motion_trail_vertex.vertex = motion_trail_vertex.vertex_function(motion_trail_vertex, motion_trail_vertex.vertex_id, motion_trail_vertex.context)
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vertex_index += 1
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# calculate v coordinate
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# this is based on the number of vertices only and not on the relative positions of the vertices
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vertex_index = 0
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float_vertex_index = 0.0
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float_total_vertices = 0.0
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float_total_vertices = total_vertices - 1.0
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while vertex_index < total_vertices:
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motion_trail_vertex = self.vertex_list [vertex_index]
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motion_trail_vertex.v = float_vertex_index / float_total_vertices
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vertex_index += 1
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float_vertex_index += 1.0
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# print "motion_trail_vertex.v", motion_trail_vertex.v
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self.modified_vertices = True
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return
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def transferVertices(self):
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# transfer only on modification
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if self.modified_vertices:
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self.cmotion_trail.setParameters(self.sampling_time, self.time_window, self.texture is not None, self.calculate_relative_matrix, self.use_nurbs, self.resolution_distance)
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self.cmotion_trail.resetVertexList()
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vertex_index = 0
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total_vertices = len(self.vertex_list)
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while vertex_index < total_vertices:
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motion_trail_vertex = self.vertex_list [vertex_index]
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self.cmotion_trail.addVertex(motion_trail_vertex.vertex, motion_trail_vertex.start_color, motion_trail_vertex.end_color, motion_trail_vertex.v)
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vertex_index += 1
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self.modified_vertices = False
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return
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def register_motion_trail(self):
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MotionTrail.motion_trail_list = MotionTrail.motion_trail_list + [self]
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return
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def unregister_motion_trail(self):
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if self in MotionTrail.motion_trail_list:
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MotionTrail.motion_trail_list.remove(self)
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return
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def begin_geometry(self):
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self.vertex_index = 0
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if self.texture is not None:
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self.format = GeomVertexFormat.getV3c4t2()
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else:
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self.format = GeomVertexFormat.getV3c4()
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self.vertex_data = GeomVertexData("vertices", self.format, Geom.UHStatic)
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self.vertex_writer = GeomVertexWriter(self.vertex_data, "vertex")
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self.color_writer = GeomVertexWriter(self.vertex_data, "color")
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if self.texture is not None:
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self.texture_writer = GeomVertexWriter(self.vertex_data, "texcoord")
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self.triangles = GeomTriangles(Geom.UHStatic)
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def add_geometry_quad(self, v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3):
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self.vertex_writer.addData3f(v0 [0], v0 [1], v0 [2])
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self.vertex_writer.addData3f(v1 [0], v1 [1], v1 [2])
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self.vertex_writer.addData3f(v2 [0], v2 [1], v2 [2])
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self.vertex_writer.addData3f(v3 [0], v3 [1], v3 [2])
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self.color_writer.addData4f(c0)
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self.color_writer.addData4f(c1)
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self.color_writer.addData4f(c2)
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self.color_writer.addData4f(c3)
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if self.texture is not None:
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self.texture_writer.addData2f(t0)
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self.texture_writer.addData2f(t1)
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self.texture_writer.addData2f(t2)
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self.texture_writer.addData2f(t3)
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vertex_index = self.vertex_index
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self.triangles.addVertex(vertex_index + 0)
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self.triangles.addVertex(vertex_index + 1)
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self.triangles.addVertex(vertex_index + 2)
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self.triangles.closePrimitive()
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self.triangles.addVertex(vertex_index + 1)
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self.triangles.addVertex(vertex_index + 3)
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self.triangles.addVertex(vertex_index + 2)
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self.triangles.closePrimitive()
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self.vertex_index += 4
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def end_geometry(self):
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self.geometry = Geom(self.vertex_data)
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self.geometry.addPrimitive(self.triangles)
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self.geom_node.removeAllGeoms()
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self.geom_node.addGeom(self.geometry)
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def check_for_update(self, current_time):
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state = False
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if (current_time - self.last_update_time) >= self.sampling_time:
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state = True
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if self.pause:
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state = False
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update = state and self.enable
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return state
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def update_motion_trail(self, current_time, transform):
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if len(self.frame_list) >= 1:
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if transform == self.frame_list [0].transform:
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# ignore duplicate transform updates
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return
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if self.check_for_update(current_time):
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color_scale = self.color_scale
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if self.fade:
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elapsed_time = current_time - self.fade_start_time
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if elapsed_time < 0.0:
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print("elapsed_time < 0: %f" %(elapsed_time))
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elapsed_time = 0.0
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if elapsed_time < self.fade_time:
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color_scale = (1.0 - (elapsed_time / self.fade_time)) * color_scale
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else:
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color_scale = 0.0
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self.fade_end = True
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self.last_update_time = current_time
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# remove expired frames
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minimum_time = current_time - self.time_window
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index = 0
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last_frame_index = len(self.frame_list) - 1
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while index <= last_frame_index:
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motion_trail_frame = self.frame_list [last_frame_index - index]
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if motion_trail_frame.time >= minimum_time:
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break
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index += 1
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if index > 0:
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self.frame_list [last_frame_index - index: last_frame_index + 1] = []
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# add new frame to beginning of list
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motion_trail_frame = MotionTrailFrame(current_time, transform)
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self.frame_list = [motion_trail_frame] + self.frame_list
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# convert frames and vertices to geometry
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total_frames = len(self.frame_list)
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#print("total_frames", total_frames)
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#
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#index = 0
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#while index < total_frames:
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# motion_trail_frame = self.frame_list [index]
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# print("frame time", index, motion_trail_frame.time)
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# index += 1
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if (total_frames >= 2) and(self.total_vertices >= 2):
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self.begin_geometry()
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total_segments = total_frames - 1
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last_motion_trail_frame = self.frame_list [total_segments]
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minimum_time = last_motion_trail_frame.time
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delta_time = current_time - minimum_time
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if self.calculate_relative_matrix:
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inverse_matrix = Mat4(transform)
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inverse_matrix.invertInPlace()
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if self.use_nurbs and(total_frames >= 5):
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total_distance = 0.0
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vector = Vec3()
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nurbs_curve_evaluator_list = []
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total_vertex_segments = self.total_vertices - 1
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# create a NurbsCurveEvaluator for each vertex(the starting point for the trail)
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index = 0
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while index < self.total_vertices:
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nurbs_curve_evaluator = NurbsCurveEvaluator()
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nurbs_curve_evaluator.reset(total_segments)
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nurbs_curve_evaluator_list = nurbs_curve_evaluator_list + [nurbs_curve_evaluator]
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index += 1
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# add vertices to each NurbsCurveEvaluator
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segment_index = 0
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while segment_index < total_segments:
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motion_trail_frame_start = self.frame_list [segment_index]
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motion_trail_frame_end = self.frame_list [segment_index + 1]
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vertex_segement_index = 0
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if self.calculate_relative_matrix:
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start_transform = Mat4()
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end_transform = Mat4()
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start_transform.multiply(motion_trail_frame_start.transform, inverse_matrix)
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end_transform.multiply(motion_trail_frame_end.transform, inverse_matrix)
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else:
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start_transform = motion_trail_frame_start.transform
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end_transform = motion_trail_frame_end.transform
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motion_trail_vertex_start = self.vertex_list [0]
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v0 = start_transform.xform(motion_trail_vertex_start.vertex)
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v2 = end_transform.xform(motion_trail_vertex_start.vertex)
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nurbs_curve_evaluator = nurbs_curve_evaluator_list [vertex_segement_index]
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nurbs_curve_evaluator.setVertex(segment_index, v0)
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while vertex_segement_index < total_vertex_segments:
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motion_trail_vertex_start = self.vertex_list [vertex_segement_index]
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motion_trail_vertex_end = self.vertex_list [vertex_segement_index + 1]
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v1 = start_transform.xform(motion_trail_vertex_end.vertex)
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v3 = end_transform.xform(motion_trail_vertex_end.vertex)
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nurbs_curve_evaluator = nurbs_curve_evaluator_list [vertex_segement_index + 1]
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nurbs_curve_evaluator.setVertex(segment_index, v1)
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if vertex_segement_index == (total_vertex_segments - 1):
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v = v1 - v3
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vector.set(v[0], v[1], v[2])
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distance = vector.length()
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total_distance += distance
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vertex_segement_index += 1
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segment_index += 1
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# evaluate NurbsCurveEvaluator for each vertex
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index = 0
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nurbs_curve_result_list = []
|
|
while index < self.total_vertices:
|
|
nurbs_curve_evaluator = nurbs_curve_evaluator_list [index]
|
|
nurbs_curve_result = nurbs_curve_evaluator.evaluate()
|
|
nurbs_curve_result_list = nurbs_curve_result_list + [nurbs_curve_result]
|
|
|
|
nurbs_start_t = nurbs_curve_result.getStartT()
|
|
nurbs_end_t = nurbs_curve_result.getEndT()
|
|
|
|
index += 1
|
|
|
|
# create quads from NurbsCurveResult
|
|
total_curve_segments = total_distance / self.resolution_distance
|
|
if total_curve_segments < total_segments:
|
|
total_curve_segments = total_segments
|
|
|
|
v0 = Vec3()
|
|
v1 = Vec3()
|
|
v2 = Vec3()
|
|
v3 = Vec3()
|
|
|
|
def one_minus_x(x):
|
|
x = 1.0 - x
|
|
if x < 0.0:
|
|
x = 0.0
|
|
return x
|
|
|
|
curve_segment_index = 0.0
|
|
while curve_segment_index < total_curve_segments:
|
|
|
|
vertex_segement_index = 0
|
|
|
|
st = curve_segment_index / total_curve_segments
|
|
et = (curve_segment_index + 1.0) / total_curve_segments
|
|
#st = curve_segment_index / total_segments
|
|
#et = (curve_segment_index + 1.0) / total_segments
|
|
|
|
start_t = st
|
|
end_t = et
|
|
|
|
if self.square_t:
|
|
start_t *= start_t
|
|
end_t *= end_t
|
|
|
|
motion_trail_vertex_start = self.vertex_list [0]
|
|
|
|
vertex_start_color = motion_trail_vertex_start.end_color + (motion_trail_vertex_start.start_color - motion_trail_vertex_start.end_color)
|
|
color_start_t = color_scale * start_t
|
|
color_end_t = color_scale * end_t
|
|
c0 = vertex_start_color * one_minus_x(color_start_t)
|
|
c2 = vertex_start_color * one_minus_x(color_end_t)
|
|
|
|
t0 = Vec2(one_minus_x(st), motion_trail_vertex_start.v)
|
|
t2 = Vec2(one_minus_x(et), motion_trail_vertex_start.v)
|
|
|
|
while vertex_segement_index < total_vertex_segments:
|
|
|
|
motion_trail_vertex_start = self.vertex_list [vertex_segement_index]
|
|
motion_trail_vertex_end = self.vertex_list [vertex_segement_index + 1]
|
|
|
|
start_nurbs_curve_result = nurbs_curve_result_list [vertex_segement_index]
|
|
end_nurbs_curve_result = nurbs_curve_result_list [vertex_segement_index + 1]
|
|
|
|
start_nurbs_start_t = start_nurbs_curve_result.getStartT()
|
|
start_nurbs_end_t = start_nurbs_curve_result.getEndT()
|
|
end_nurbs_start_t = end_nurbs_curve_result.getStartT()
|
|
end_nurbs_end_t = end_nurbs_curve_result.getEndT()
|
|
|
|
start_delta_t = (start_nurbs_end_t - start_nurbs_start_t)
|
|
end_delta_t = (end_nurbs_end_t - end_nurbs_start_t)
|
|
|
|
start_nurbs_curve_result.evalPoint(start_nurbs_start_t + (start_delta_t * st), v0)
|
|
end_nurbs_curve_result.evalPoint(end_nurbs_start_t + (end_delta_t * st), v1)
|
|
|
|
start_nurbs_curve_result.evalPoint(start_nurbs_start_t + (start_delta_t * et), v2)
|
|
end_nurbs_curve_result.evalPoint(end_nurbs_start_t + (end_delta_t * et), v3)
|
|
|
|
# color
|
|
vertex_end_color = motion_trail_vertex_end.end_color + (motion_trail_vertex_end.start_color - motion_trail_vertex_end.end_color)
|
|
|
|
c1 = vertex_end_color * one_minus_x(color_start_t)
|
|
c3 = vertex_end_color * one_minus_x(color_end_t)
|
|
|
|
# uv
|
|
t1 = Vec2(one_minus_x(st), motion_trail_vertex_end.v)
|
|
t3 = Vec2(one_minus_x(et), motion_trail_vertex_end.v)
|
|
|
|
self.add_geometry_quad(v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3)
|
|
|
|
# reuse calculations
|
|
c0 = c1
|
|
c2 = c3
|
|
|
|
t0 = t1
|
|
t2 = t3
|
|
|
|
vertex_segement_index += 1
|
|
|
|
curve_segment_index += 1.0
|
|
|
|
|
|
else:
|
|
|
|
segment_index = 0
|
|
while segment_index < total_segments:
|
|
motion_trail_frame_start = self.frame_list [segment_index]
|
|
motion_trail_frame_end = self.frame_list [segment_index + 1]
|
|
|
|
start_t = (motion_trail_frame_start.time - minimum_time) / delta_time
|
|
end_t = (motion_trail_frame_end.time - minimum_time) / delta_time
|
|
|
|
st = start_t
|
|
et = end_t
|
|
|
|
if self.square_t:
|
|
start_t *= start_t
|
|
end_t *= end_t
|
|
|
|
vertex_segement_index = 0
|
|
total_vertex_segments = self.total_vertices - 1
|
|
|
|
if self.calculate_relative_matrix:
|
|
start_transform = Mat4()
|
|
end_transform = Mat4()
|
|
start_transform.multiply(motion_trail_frame_start.transform, inverse_matrix)
|
|
end_transform.multiply(motion_trail_frame_end.transform, inverse_matrix)
|
|
else:
|
|
start_transform = motion_trail_frame_start.transform
|
|
end_transform = motion_trail_frame_end.transform
|
|
|
|
motion_trail_vertex_start = self.vertex_list [0]
|
|
|
|
v0 = start_transform.xform(motion_trail_vertex_start.vertex)
|
|
v2 = end_transform.xform(motion_trail_vertex_start.vertex)
|
|
|
|
vertex_start_color = motion_trail_vertex_start.end_color + (motion_trail_vertex_start.start_color - motion_trail_vertex_start.end_color)
|
|
color_start_t = color_scale * start_t
|
|
color_end_t = color_scale * end_t
|
|
c0 = vertex_start_color * color_start_t
|
|
c2 = vertex_start_color * color_end_t
|
|
|
|
t0 = Vec2(st, motion_trail_vertex_start.v)
|
|
t2 = Vec2(et, motion_trail_vertex_start.v)
|
|
|
|
while vertex_segement_index < total_vertex_segments:
|
|
|
|
motion_trail_vertex_start = self.vertex_list [vertex_segement_index]
|
|
motion_trail_vertex_end = self.vertex_list [vertex_segement_index + 1]
|
|
|
|
v1 = start_transform.xform(motion_trail_vertex_end.vertex)
|
|
v3 = end_transform.xform(motion_trail_vertex_end.vertex)
|
|
|
|
# color
|
|
vertex_end_color = motion_trail_vertex_end.end_color + (motion_trail_vertex_end.start_color - motion_trail_vertex_end.end_color)
|
|
|
|
c1 = vertex_end_color * color_start_t
|
|
c3 = vertex_end_color * color_end_t
|
|
|
|
# uv
|
|
t1 = Vec2(st, motion_trail_vertex_end.v)
|
|
t3 = Vec2(et, motion_trail_vertex_end.v)
|
|
|
|
self.add_geometry_quad(v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3)
|
|
|
|
# reuse calculations
|
|
v0 = v1
|
|
v2 = v3
|
|
|
|
c0 = c1
|
|
c2 = c3
|
|
|
|
t0 = t1
|
|
t2 = t3
|
|
|
|
vertex_segement_index += 1
|
|
|
|
segment_index += 1
|
|
|
|
self.end_geometry()
|
|
|
|
def enable_motion_trail(self, enable):
|
|
self.enable = enable
|
|
|
|
def reset_motion_trail(self):
|
|
self.frame_list = []
|
|
self.cmotion_trail.reset()
|
|
|
|
def reset_motion_trail_geometry(self):
|
|
if self.geom_node is not None:
|
|
self.geom_node.removeAllGeoms()
|
|
|
|
def attach_motion_trail(self):
|
|
self.reset_motion_trail()
|
|
|
|
def begin_motion_trail(self):
|
|
if not self.continuous_motion_trail:
|
|
self.reset_motion_trail()
|
|
self.active = True
|
|
self.playing = True
|
|
|
|
def end_motion_trail(self):
|
|
if not self.continuous_motion_trail:
|
|
self.active = False
|
|
self.reset_motion_trail()
|
|
self.reset_motion_trail_geometry()
|
|
self.playing = False
|
|
|
|
# the following functions are not currently supported in the C++ version
|
|
|
|
def set_fade(self, time, current_time):
|
|
if not self.pause:
|
|
self.fade_color_scale = 1.0
|
|
|
|
if time == 0.0:
|
|
self.fade = False
|
|
else:
|
|
self.fade_start_time = current_time
|
|
self.fade_time = time
|
|
self.fade = True
|
|
|
|
def pause_motion_trail(self, current_time):
|
|
if not self.pause:
|
|
self.pause_time = current_time
|
|
self.pause = True
|
|
|
|
def resume_motion_trail(self, current_time):
|
|
if self.pause:
|
|
delta_time = current_time - self.pause_time
|
|
|
|
frame_index = 0
|
|
total_frames = len(self.frame_list)
|
|
while frame_index < total_frames:
|
|
motion_trail_frame = self.frame_list [frame_index]
|
|
motion_trail_frame.time += delta_time
|
|
frame_index += 1
|
|
|
|
if self.fade:
|
|
self.fade_start_time += delta_time
|
|
|
|
self.pause = False
|
|
|
|
def toggle_pause_motion_trail(self, current_time):
|
|
if self.pause:
|
|
self.resume_motion_trail(current_time)
|
|
else:
|
|
self.pause_motion_trail(current_time)
|