Mercurial > code > home > repos > light9
annotate flax/Timeline.py @ 2405:69ca2b2fc133
overcomplicated attempt at persisting the pane layout in the rdf graph
this was hard because we have to somehow wait for the graph to load before config'ing the panes
| author | drewp@bigasterisk.com |
|---|---|
| date | Fri, 17 May 2024 16:58:26 -0700 |
| parents | 851cf44cea40 |
| children |
| rev | line source |
|---|---|
| 0 | 1 from TLUtility import make_attributes_from_args, dict_scale, dict_max, \ |
| 2 DummyClass, last_less_than, first_greater_than | |
| 3 from time import time | |
| 206 | 4 import random |
| 0 | 5 from __future__ import division # "I'm sending you back to future!" |
| 6 | |
| 7 """ | |
|
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8 Quote of the Build (from Ghostbusters II) |
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9 Dana: Okay, but after dinner, I don't want you putting any of your old cheap |
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10 moves on me. |
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11 Peter: Ohhhh no! I've got all NEW cheap moves. |
| 0 | 12 """ |
| 13 | |
| 14 class MissingBlender(Exception): | |
| 15 """Raised when a TimedEvent is missing a blender.""" | |
| 16 def __init__(self, timedevent): | |
| 17 make_attributes_from_args('timedevent') | |
| 18 Exception.__init__(self, "%r is missing a blender." % \ | |
| 19 self.timedevent) | |
| 20 | |
| 21 # these are chosen so we can multiply by -1 to reverse the direction, | |
| 22 # and multiply direction by the time difference to determine new times. | |
| 23 FORWARD = 1 | |
| 24 BACKWARD = -1 | |
| 25 | |
| 135 | 26 MISSING = 'missing' |
| 27 | |
| 0 | 28 class TimedEvent: |
| 29 """Container for a Frame which includes a time that it occurs at, | |
| 30 and which blender occurs after it.""" | |
| 135 | 31 def __init__(self, time, frame=MISSING, blender=None, level=1.0): |
| 0 | 32 make_attributes_from_args('time', 'frame') |
| 33 self.next_blender = blender | |
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34 self.level = level |
| 0 | 35 def __float__(self): |
| 36 return self.time | |
| 37 def __cmp__(self, other): | |
| 135 | 38 if other is None: |
| 39 raise "I can't compare with a None. I am '%s'" % str(self) | |
| 0 | 40 if type(other) in (float, int): |
| 41 return cmp(self.time, other) | |
| 42 else: | |
| 43 return cmp(self.time, other.time) | |
| 44 def __repr__(self): | |
|
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45 return "<TimedEvent %s at %.2f, time=%.2f, next blender=%s>" % \ |
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46 (self.frame, self.level, self.time, self.next_blender) |
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47 def get_level(self): |
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48 return self.level |
| 123 | 49 def __hash__(self): |
| 50 return id(self.time) ^ id(self.frame) ^ id(self.next_blender) | |
| 0 | 51 |
| 52 class Blender: | |
| 53 """Blenders are functions that merge the effects of two LevelFrames.""" | |
| 54 def __init__(self): | |
| 55 pass | |
| 135 | 56 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 57 """Return a LevelFrame combining two LevelFrames (startframe and |
| 58 endframe). blendtime is how much of the blend should be performed | |
| 59 and will be expressed as a percentage divided by 100, i.e. a float | |
| 135 | 60 between 0.0 and 1.0. time_since_startframe is the time since the |
| 61 startframe was on screen in seconds (float). | |
| 0 | 62 |
| 63 Very important note: Blenders will *not* be asked for values | |
| 64 at end points (i.e. blendtime=0.0 and blendtime=1.0). | |
| 65 The LevelFrames will be allowed to specify the values at | |
| 66 those times. This is unfortunately for implemementation and | |
| 67 simplicity purposes. In other words, if we didn't do this, | |
| 68 we could have two blenders covering the same point in time and | |
| 69 not know which one to ask for the value. Thus, this saves us | |
| 70 a lot of messiness with minimal or no sacrifice.""" | |
| 71 pass | |
| 72 def __str__(self): | |
| 73 """As a default, we'll just return the name of the class. Subclasses | |
| 74 can add parameters on if they want.""" | |
| 75 return str(self.__class__) | |
| 76 def linear_blend(self, startframe, endframe, blendtime): | |
| 77 """Utility function to help you produce linear combinations of two | |
| 78 blends. blendtime is the percent/100 that the blend should | |
| 79 completed. In other words, 0.25 means it should be 0.75 * startframe + | |
| 80 0.25 * endframe. This function is included since many blenders are | |
| 81 just functions on the percentage and still combine start and end frames | |
| 82 in this way.""" | |
| 123 | 83 if startframe.frame == endframe.frame: |
| 135 | 84 level = startframe.level + (blendtime * \ |
| 85 (endframe.level - startframe.level)) | |
| 86 levels = {startframe.frame : level} | |
| 123 | 87 else: |
| 88 levels = {startframe.frame : (1.0 - blendtime) * startframe.level, | |
| 89 endframe.frame : blendtime * endframe.level} | |
| 90 return levels | |
| 0 | 91 |
| 92 class InstantEnd(Blender): | |
| 93 """Instant change from startframe to endframe at the end. In other words, | |
| 94 the value returned will be the startframe all the way until the very end | |
| 95 of the blend.""" | |
| 135 | 96 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 97 # "What!?" you say, "Why don't you care about blendtime?" |
| 98 # This is because Blenders never be asked for blenders at the endpoints | |
| 99 # (after all, they wouldn't be blenders if they were). Please see | |
| 100 # 'Very important note' in Blender.__doc__ | |
| 123 | 101 return {startframe.frame : startframe.level} |
| 0 | 102 |
| 103 class InstantStart(Blender): | |
| 104 """Instant change from startframe to endframe at the beginning. In other | |
| 105 words, the value returned will be the startframe at the very beginning | |
| 106 and then be endframe at all times afterwards.""" | |
| 135 | 107 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 108 # "What!?" you say, "Why don't you care about blendtime?" |
| 109 # This is because Blenders never be asked for blenders at the endpoints | |
| 110 # (after all, they wouldn't be blenders if they were). Please see | |
| 111 # 'Very important note' in Blender.__doc__ | |
| 123 | 112 return {endframe.frame : endframe.level} |
| 0 | 113 |
| 114 class LinearBlender(Blender): | |
| 115 """Linear fade from one frame to another""" | |
| 135 | 116 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 117 return self.linear_blend(startframe, endframe, blendtime) |
| 118 | |
| 119 class ExponentialBlender(Blender): | |
| 120 """Exponential fade fron one frame to another. You get to specify | |
| 121 the exponent. If my math is correct, exponent=1 means the same thing | |
| 122 as LinearBlender.""" | |
| 123 def __init__(self, exponent): | |
| 124 self.exponent = exponent | |
| 135 | 125 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 126 blendtime = blendtime ** self.exponent |
| 127 return self.linear_blend(startframe, endframe, blendtime) | |
| 128 | |
| 129 # 17:02:53 drewp: this makes a big difference for the SmoothBlender | |
| 130 # (-x*x*(x-1.5)*2) function | |
| 131 class SmoothBlender(Blender): | |
| 132 """Drew's "Smoove" Blender function. Hopefully he'll document and | |
| 133 parametrize it.""" | |
| 135 | 134 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 135 blendtime = (-1 * blendtime) * blendtime * (blendtime - 1.5) * 2 |
| 136 return self.linear_blend(startframe, endframe, blendtime) | |
| 137 | |
| 135 | 138 class Strobe(Blender): |
| 139 "Strobes the frame on the right side between offlevel and onlevel." | |
| 140 def __init__(self, ontime, offtime, onlevel=1, offlevel=0): | |
| 138 | 141 "times are in seconds (floats)" |
| 135 | 142 make_attributes_from_args('ontime', 'offtime', 'onlevel', 'offlevel') |
| 143 self.cycletime = ontime + offtime | |
| 144 def __call__(self, startframe, endframe, blendtime, time_since_startframe): | |
| 145 # time into the current period | |
| 146 period_time = time_since_startframe % self.cycletime | |
| 147 if period_time <= self.ontime: | |
| 148 return {endframe.frame : self.onlevel} | |
| 149 else: | |
| 150 return {endframe.frame : self.offlevel} | |
| 151 | |
| 206 | 152 class Sine(Blender): |
| 153 "Strobes the frame on the right side between offlevel and onlevel." | |
| 154 def __init__(self, period, onlevel=1, offlevel=0): | |
| 155 "times are in seconds (floats)" | |
| 156 make_attributes_from_args('period', 'onlevel', 'offlevel') | |
| 157 def __call__(self, startframe, endframe, blendtime, time_since_startframe): | |
| 158 sin = math.sin(time_since_startframe / self.period * 2 * math.pi) | |
| 159 zerotoone = (sin / 2) + 0.5 | |
| 160 level = offlevel + (zerotoone * (onlevel - offlevel)) | |
| 161 return {endframe.frame : level} | |
| 162 | |
| 163 class RandomStrobe(Blender): | |
| 164 def __init__(self, minwaitlen=0.1, maxwaitlen=0.6, burstlen=0.14, \ | |
| 165 burstintensity=1, offintensity=0.05, tracklen=500): | |
| 166 "times are in seconds (floats)" | |
| 167 make_attributes_from_args('burstlen', 'burstintensity', 'offintensity') | |
| 168 self.burstintervals = [] | |
| 169 timecursor = 0 | |
| 170 | |
| 171 while timecursor < tracklen: | |
| 172 waitlen = minwaitlen + (random.random() * (maxwaitlen - minwaitlen)) | |
| 173 timecursor += waitlen | |
| 174 self.burstintervals.append((timecursor, timecursor + burstlen)) | |
| 175 def __call__(self, startframe, endframe, blendtime, time_since_startframe): | |
| 176 found_burst = 0 | |
| 177 for intstart, intend in self.burstintervals: | |
| 178 if intstart <= time_since_startframe <= intend: | |
| 179 found_burst = 1 | |
| 180 break | |
| 181 | |
| 182 if found_burst: | |
| 183 return {endframe.frame : self.burstintensity} | |
| 184 else: | |
| 185 return {endframe.frame : self.offintensity} | |
| 186 | |
| 0 | 187 class TimelineTrack: |
| 188 """TimelineTrack is a single track in a Timeline. It consists of a | |
| 189 list of TimedEvents and a name. Length is automatically the location | |
| 190 of the last TimedEvent. To extend the Timeline past that, add an | |
|
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191 EmptyTimedEvent (which doesn't exist :-/).""" |
| 135 | 192 def __init__(self, name, *timedevents, **kw): |
| 193 if kw.get('default_frame'): | |
| 194 self.default_frame = kw['default_frame'] | |
| 195 else: | |
| 196 self.default_frame = None | |
| 0 | 197 self.name = name |
| 138 | 198 self.set_events(list(timedevents)) |
| 199 def set_events(self, events): | |
| 200 """This is given a list of TimedEvents. They need not be sorted.""" | |
| 201 self.events = events | |
| 202 self._cleaup_events() | |
| 203 def _cleaup_events(self): | |
| 204 """This makes sure all events are in the right order and have defaults | |
| 205 filled in if they have missing frames.""" | |
| 0 | 206 self.events.sort() |
| 139 | 207 self.fill_in_missing_frames() |
| 138 | 208 def add_event(self, event): |
| 209 """Add a TimedEvent object to this TimelineTrack""" | |
| 210 self.events.append(event) | |
| 211 self._cleaup_events(self.events) | |
| 212 def delete_event(self, event): | |
| 213 """Delete event by TimedEvent object""" | |
| 214 self.events.remove(event) | |
| 215 self._cleaup_events(self.events) | |
| 216 def delete_event_by_name(self, name): | |
| 217 """Deletes all events matching a certain name""" | |
| 218 self.events = [e for e in self.events if e.name is not name] | |
| 219 self._cleaup_events(self.events) | |
| 220 def delete_event_by_time(self, starttime, endtime=None): | |
| 221 """Deletes all events within a certain time range, inclusive. endtime | |
| 222 is optional.""" | |
| 223 endtime = endtime or starttime | |
| 224 self.events = [e for e in self.events | |
| 225 if e.time >= starttime and e.time <= endtime] | |
| 226 self._cleaup_events(self.events) | |
| 139 | 227 def fill_in_missing_frames(self): |
| 138 | 228 """Runs through all events and sets TimedEvent with missing frames to |
| 229 the default frame.""" | |
| 135 | 230 for event in self.events: |
| 231 if event.frame == MISSING: | |
| 232 event.frame = self.default_frame | |
| 0 | 233 def __str__(self): |
| 234 return "<TimelineTrack with events: %r>" % self.events | |
| 235 def has_events(self): | |
| 236 """Whether the TimelineTrack has anything in it. In general, | |
| 237 empty level Tracks should be avoided. However, empty function tracks | |
| 238 might be common.""" | |
| 239 return len(self.events) | |
| 240 def length(self): | |
| 241 """Returns the length of this track in pseudosecond time units. | |
| 242 This is done by finding the position of the last TimedEvent.""" | |
| 243 return float(self.events[-1]) | |
| 244 def get(self, key, direction=FORWARD): | |
| 245 """Returns the event at a specific time key. If there is no event | |
| 246 at that time, a search will be performed in direction. Also note | |
| 247 that if there are multiple events at one time, only the first will | |
| 248 be returned. (Probably first in order of adding.) This is not | |
| 249 a problem at the present since this method is intended for LevelFrames, | |
| 250 which must exist at unique times.""" | |
| 251 if direction == BACKWARD: | |
| 252 func = last_less_than | |
| 253 else: | |
| 254 func = first_greater_than | |
| 255 | |
| 256 return func(self.events, key) | |
| 257 def get_range(self, i, j, direction=FORWARD): | |
| 258 """Returns all events between i and j, exclusively. If direction | |
| 259 is FORWARD, j will be included. If direction is BACKWARD, i will | |
| 260 be included. This is because this is used to find FunctionFrames | |
| 261 and we assume that any function frames at the start point (which | |
| 262 could be i or j) have been processed.""" | |
|
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263 return [e for e in self.events if e >= i and e <= j] |
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264 |
| 0 | 265 if direction == FORWARD: |
| 266 return [e for e in self.events if e > i and e <= j] | |
| 267 else: | |
| 268 return [e for e in self.events if e >= i and e < j] | |
| 269 def __getitem__(self, key): | |
| 270 """Returns the event at or after a specific time key. | |
| 271 For example: timeline[3] will get the first event at time 3. | |
| 272 | |
| 273 If you want to get all events at time 3, you are in trouble, but | |
| 274 you could achieve it with something like: | |
| 275 timeline.get_range(2.99, 3.01, FORWARD) | |
| 276 This is hopefully a bogus problem, since you can't have multiple | |
| 277 LevelFrames at the same time.""" | |
| 278 return self.get(key, direction=FORWARD) | |
| 279 def get_surrounding_frames(self, time): | |
| 280 """Returns frames before and after a specific time. This returns | |
| 281 a 2-tuple: (previousframe, nextframe). If you have chosen the exact | |
| 282 time of a frame, it will be both previousframe and nextframe.""" | |
| 283 return self.get(time, direction=BACKWARD), \ | |
| 284 self.get(time, direction=FORWARD) | |
| 285 def get_levels_at_time(self, time): | |
| 286 """Returns a LevelFrame with the levels of this track at that time.""" | |
| 287 before, after = self.get_surrounding_frames(time) | |
| 288 | |
| 123 | 289 if not after or before == after: |
| 290 return {before.frame : before.level} | |
| 0 | 291 else: # we have a blended value |
| 292 diff = after.time - before.time | |
| 293 elapsed = time - before.time | |
| 294 percent = elapsed / diff | |
| 295 if not before.next_blender: | |
| 296 raise MissingBlender, before | |
| 135 | 297 return before.next_blender(before, after, percent, elapsed) |
| 0 | 298 |
| 299 class Timeline: | |
| 135 | 300 def __init__(self, name, tracks, rate=1, direction=FORWARD): |
| 0 | 301 """ |
|
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302 Most/all of this is old: |
| 0 | 303 |
| 304 You can have multiple FunctionFrames at the same time. Their | |
| 305 order is important though, since FunctionFrames will be applied | |
| 306 in the order seen in this list. blenders is a list of Blenders. | |
| 307 rate is the rate of playback. If set to 1, 1 unit inside the | |
| 308 Timeline will be 1 second. direction is the initial direction. | |
| 309 If you want to do have looping, place a LoopFunction at the end of | |
| 310 the Timeline. Timelines don't have a set length. Their length | |
| 311 is bounded by their last frame. You can put an EmptyFrame at | |
| 312 some time if you want to extend a Timeline.""" | |
| 313 | |
| 135 | 314 make_attributes_from_args('name', 'tracks', 'rate', 'direction') |
| 0 | 315 self.current_time = 0 |
| 316 self.last_clock_time = None | |
| 317 self.stopped = 1 | |
| 318 def length(self): | |
| 319 """Length of the timeline in pseudoseconds. This is determined by | |
| 320 finding the length of the longest track.""" | |
| 321 track_lengths = [track.length() for track in self.tracks] | |
| 322 return max(track_lengths) | |
| 323 def play(self): | |
| 324 """Activates the timeline. Future calls to tick() will advance the | |
| 325 timeline in the appropriate direction.""" | |
| 326 self.stopped = 0 | |
| 327 def stop(self): | |
| 328 """The timeline will no longer continue in either direction, no | |
| 329 FunctionFrames will be activated.""" | |
| 330 self.stopped = 1 | |
| 331 self.last_clock_time = None | |
| 332 def reset(self): | |
| 333 """Resets the timeline to 0. Does not change the stoppedness of the | |
| 334 timeline.""" | |
| 335 self.current_time = 0 | |
| 336 def tick(self): | |
| 337 """Updates the current_time and runs any FunctionFrames that the cursor | |
| 338 passed over. This call is ignored if the timeline is stopped.""" | |
| 339 if self.stopped: | |
| 340 return | |
| 341 | |
| 342 last_time = self.current_time | |
| 343 last_clock = self.last_clock_time | |
| 344 | |
| 345 # first, determine new time | |
| 346 clock_time = time() | |
| 347 if last_clock is None: | |
| 348 last_clock = clock_time | |
| 349 diff = clock_time - last_clock | |
| 350 new_time = (self.direction * self.rate * diff) + last_time | |
| 351 | |
| 352 # update the time | |
| 353 self.last_clock_time = clock_time | |
| 354 self.current_time = new_time | |
| 355 | |
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356 # now we make sure we're in bounds (we don't do this before, since it |
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357 # can cause us to skip events that are at boundaries. |
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358 self.current_time = max(self.current_time, 0) |
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359 self.current_time = min(self.current_time, self.length()) |
| 0 | 360 def reverse_direction(self): |
| 361 """Reverses the direction of play for this node""" | |
| 362 self.direction = self.direction * -1 | |
| 363 def set_direction(self, direction): | |
| 364 """Sets the direction of playback.""" | |
| 365 self.direction = direction | |
| 366 def set_rate(self, new_rate): | |
| 367 """Sets the rate of playback""" | |
| 368 self.rate = new_rate | |
| 369 def set_time(self, new_time): | |
| 370 """Set the time to a new time.""" | |
| 371 self.current_time = new_time | |
| 372 def get_levels(self): | |
| 373 """Return the current levels from this timeline. This is done by | |
| 374 adding all the non-functional tracks together.""" | |
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375 levels = [t.get_levels_at_time(self.current_time) |
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376 for t in self.tracks] |
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377 return dict_max(*levels) |
| 0 | 378 |
| 379 if __name__ == '__main__': | |
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380 def T(*args, **kw): |
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381 """This used to be a synonym for TimedEvent: |
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382 |
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383 T = TimedEvent |
| 0 | 384 |
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385 It now acts the same way, except that it will fill in a default |
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386 blender if you don't. The default blender is a LinearBlender.""" |
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387 linear = LinearBlender() |
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388 if 'blender' not in kw: |
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389 kw['blender'] = linear |
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390 |
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391 return TimedEvent(*args, **kw) |
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392 |
| 0 | 393 quad = ExponentialBlender(2) |
| 394 invquad = ExponentialBlender(0.5) | |
| 395 smoove = SmoothBlender() | |
| 396 | |
| 123 | 397 track1 = TimelineTrack('red track', |
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398 T(0, 'red', level=0), |
| 123 | 399 T(4, 'red', blender=quad, level=0.5), |
| 400 T(12, 'red', blender=smoove, level=0.7), | |
| 401 T(15, 'red', level=0.0)) # last TimedEvent doesn't need a blender | |
| 402 track2 = TimelineTrack('green track', | |
| 403 T(0, 'green', blender=invquad, level=0.2), | |
| 404 T(5, 'green', blender=smoove, level=1), | |
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405 T(10, 'green', level=0.8), |
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406 T(15, 'green', level=0.6), |
| 123 | 407 T(20, 'green', level=0.0)) # last TimedEvent doesn't need a blender |
| 408 track3 = TimelineTrack('tableau demo', | |
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409 T(0, 'blue', level=0.0), |
| 123 | 410 T(2, 'blue', level=1.0, blender=InstantEnd()), |
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411 T(18, 'blue', level=1.0), |
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412 T(20, 'blue', level=0.0)) |
| 0 | 413 |
| 135 | 414 tl = Timeline('test', [track1, track2, track3]) |
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415 |
| 0 | 416 tl.play() |
| 417 | |
| 418 import Tix | |
| 419 root = Tix.Tk() | |
| 420 colorscalesframe = Tix.Frame(root) | |
| 421 scalevars = {} | |
| 422 # wow, this works out so well, it's almost like I planned it! | |
| 423 # (actually, it's probably just Tk being as cool as it usually is) | |
| 424 # ps. if this code ever turns into mainstream code for flax, I'll be | |
| 425 # pissed (reason: we need to use classes, not this hacked crap!) | |
| 426 colors = 'red', 'blue', 'green', 'yellow', 'purple' | |
| 427 for color in colors: | |
| 428 sv = Tix.DoubleVar() | |
| 429 scalevars[color] = sv | |
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430 scale = Tix.Scale(colorscalesframe, from_=1, to_=0, res=0.01, bg=color, |
| 0 | 431 variable=sv) |
| 432 scale.pack(side=Tix.LEFT) | |
| 433 | |
| 434 def set_timeline_time(time): | |
| 435 tl.set_time(float(time)) | |
| 436 # print 'set_timeline_time', time | |
| 437 | |
| 438 def update_scales(): | |
| 439 levels = tl.get_levels() | |
| 440 for color in colors: | |
| 441 scalevars[color].set(levels.get(color, 0)) | |
| 442 | |
| 443 colorscalesframe.pack() | |
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444 time_scale = Tix.Scale(root, from_=0, to_=tl.length(), |
| 0 | 445 orient=Tix.HORIZONTAL, res=0.01, command=set_timeline_time) |
| 446 time_scale.pack(side=Tix.BOTTOM, fill=Tix.X, expand=1) | |
| 447 | |
| 448 def play_tl(): | |
| 449 tl.tick() | |
| 450 update_scales() | |
| 451 time_scale.set(tl.current_time) | |
| 452 # print 'time_scale.set', tl.current_time | |
| 453 root.after(10, play_tl) | |
| 454 | |
| 455 controlwindow = Tix.Toplevel() | |
| 456 Tix.Button(controlwindow, text='Stop', | |
| 457 command=lambda: tl.stop()).pack(side=Tix.LEFT) | |
| 458 Tix.Button(controlwindow, text='Play', | |
| 459 command=lambda: tl.play()).pack(side=Tix.LEFT) | |
| 460 Tix.Button(controlwindow, text='Reset', | |
| 461 command=lambda: time_scale.set(0)).pack(side=Tix.LEFT) | |
| 462 Tix.Button(controlwindow, text='Flip directions', | |
| 463 command=lambda: tl.reverse_direction()).pack(side=Tix.LEFT) | |
| 464 Tix.Button(controlwindow, text='1/2x', | |
| 465 command=lambda: tl.set_rate(0.5 * tl.rate)).pack(side=Tix.LEFT) | |
| 466 Tix.Button(controlwindow, text='2x', | |
| 467 command=lambda: tl.set_rate(2 * tl.rate)).pack(side=Tix.LEFT) | |
| 468 | |
| 469 root.after(100, play_tl) | |
| 470 | |
| 471 # Timeline.set_time = trace(Timeline.set_time) | |
| 472 | |
| 473 Tix.mainloop() |