376 lines
13 KiB
Python
376 lines
13 KiB
Python
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from pandac.PandaModules import *
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from otp.otpbase import OTPRender
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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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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):
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notify = directNotify.newCategory ("MotionTrail")
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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.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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# default options
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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 = 1.0 / 30.0
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self.square_t = True
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# render
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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.node ( ).setAttrib (ColorBlendAttrib.make (ColorBlendAttrib.MAdd))
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node_path.setTransparency (True)
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node_path.setDepthWrite (False)
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node_path.setTwoSided (True)
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# do not light
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node_path.setLightOff ( )
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# do not display in reflections
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OTPRender.renderReflection (False, self, 'motion_trail', None)
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return
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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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return motion_trail_vertex
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def set_texture (self, texture):
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self.texture = 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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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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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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return
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def begin_geometry (self):
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self.vertex_index = 0;
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self.format = GeomVertexFormat.getV3c4t2 ( )
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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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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 [0], c0 [1], c0 [2], c0 [3])
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self.color_writer.addData4f (c1 [0], c1 [1], c1 [2], c1 [3])
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self.color_writer.addData4f (c2 [0], c2 [1], c2 [2], c2 [3])
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self.color_writer.addData4f (c3 [0], c3 [1], c3 [2], c3 [3])
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self.texture_writer.addData2f (t0 [0], t0 [1])
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self.texture_writer.addData2f (t1 [0], t1 [1])
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self.texture_writer.addData2f (t2 [0], t2 [1])
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self.texture_writer.addData2f (t3 [0], t3 [1])
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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 update_motion_trail (self, current_time, transform):
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update = False
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if ((current_time - self.last_update_time) >= self.sampling_time):
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update = True
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if (self.pause):
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update = False
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if (update):
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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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elapsed_time = 0.0
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print "elapsed_time < 0", elapsed_time
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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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"""
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print "*** minimum_time", minimum_time
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"""
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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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"""
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print "total_frames", total_frames
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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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"""
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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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# print "minimum_time", minimum_time
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# print "delta_time", delta_time
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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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start_t = (motion_trail_frame_start.time - minimum_time) / delta_time
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end_t = (motion_trail_frame_end.time - minimum_time) / delta_time
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st = start_t
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et = end_t
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# print "st", st
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# print "et", et
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if (self.square_t):
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start_t *= start_t
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end_t *= end_t
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# print "start_t", start_t
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# print "end_t", end_t
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vertex_segement_index = 0
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total_vertex_segments = self.total_vertices - 1
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motion_trail_vertex_start = self.vertex_list [0]
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v0 = motion_trail_frame_start.transform.xform (motion_trail_vertex_start.vertex)
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v2 = motion_trail_frame_end.transform.xform (motion_trail_vertex_start.vertex)
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vertex_start_color = motion_trail_vertex_start.end_color + (motion_trail_vertex_start.start_color - motion_trail_vertex_start.end_color)
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color_start_t = color_scale * start_t
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color_end_t = color_scale * end_t
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c0 = vertex_start_color * color_start_t
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c2 = vertex_start_color * color_end_t
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t0 = Vec2 (st, motion_trail_vertex_start.v)
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t2 = Vec2 (et, motion_trail_vertex_start.v)
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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 = motion_trail_frame_start.transform.xform (motion_trail_vertex_end.vertex)
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v3 = motion_trail_frame_end.transform.xform (motion_trail_vertex_end.vertex)
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"""
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print v0
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print v1
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print v2
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print v3
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"""
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# color
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vertex_end_color = motion_trail_vertex_end.end_color + (motion_trail_vertex_end.start_color - motion_trail_vertex_end.end_color)
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c1 = vertex_end_color * color_start_t
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c3 = vertex_end_color * color_end_t
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# uv
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t1 = Vec2 (st, motion_trail_vertex_end.v)
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t3 = Vec2 (et, motion_trail_vertex_end.v)
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self.add_geometry_quad (v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3)
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# reuse calculations
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v0 = v1
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v2 = v3
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c0 = c1
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c2 = c3
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t0 = t1
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t2 = t3
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vertex_segement_index += 1
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segment_index += 1
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self.end_geometry ( )
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return
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def enable_motion_trail(self, enable):
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self.enable = enable
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return
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def reset_motion_trail(self):
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self.frame_list = [ ]
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return
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def set_fade (self, time, current_time):
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if (self.pause == False):
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self.fade_color_scale = 1.0
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if (time == 0.0):
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self.fade = False
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else:
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self.fade_start_time = current_time
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self.fade_time = time
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self.fade = True
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return
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def pause_motion_trail(self, current_time):
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if (self.pause == False):
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self.pause_time = current_time
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self.pause = True
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return
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def resume_motion_trail(self, current_time):
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if (self.pause):
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delta_time = current_time - self.pause_time
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frame_index = 0
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total_frames = len (self.frame_list)
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while (frame_index < total_frames):
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motion_trail_frame = self.frame_list [frame_index]
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motion_trail_frame.time += delta_time
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frame_index += 1
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if (self.fade):
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self.fade_start_time += delta_time
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self.pause = False
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return
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def toggle_pause_motion_trail (self, current_time):
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if (self.pause):
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self.resume_motion_trail (current_time)
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else:
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self.pause_motion_trail (current_time)
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