Mercurial > code > home > repos > light9
annotate flax/Timeline.py @ 135:5670f66845ce
- results of work from 6.13 rehearsal
| author | dmcc |
|---|---|
| date | Sat, 14 Jun 2003 15:00:47 +0000 |
| parents | 8de8a2f467db |
| children | 304152488ed7 |
| 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 | |
| 4 from __future__ import division # "I'm sending you back to future!" | |
| 5 | |
| 6 """ | |
|
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7 Quote of the Build (from Ghostbusters II) |
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8 Dana: Okay, but after dinner, I don't want you putting any of your old cheap |
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9 moves on me. |
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10 Peter: Ohhhh no! I've got all NEW cheap moves. |
| 0 | 11 """ |
| 12 | |
| 13 class MissingBlender(Exception): | |
| 14 """Raised when a TimedEvent is missing a blender.""" | |
| 15 def __init__(self, timedevent): | |
| 16 make_attributes_from_args('timedevent') | |
| 17 Exception.__init__(self, "%r is missing a blender." % \ | |
| 18 self.timedevent) | |
| 19 | |
| 20 # these are chosen so we can multiply by -1 to reverse the direction, | |
| 21 # and multiply direction by the time difference to determine new times. | |
| 22 FORWARD = 1 | |
| 23 BACKWARD = -1 | |
| 24 | |
| 135 | 25 MISSING = 'missing' |
| 26 | |
| 0 | 27 class TimedEvent: |
| 28 """Container for a Frame which includes a time that it occurs at, | |
| 29 and which blender occurs after it.""" | |
| 135 | 30 def __init__(self, time, frame=MISSING, blender=None, level=1.0): |
| 0 | 31 make_attributes_from_args('time', 'frame') |
| 32 self.next_blender = blender | |
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33 self.level = level |
| 0 | 34 def __float__(self): |
| 35 return self.time | |
| 36 def __cmp__(self, other): | |
| 135 | 37 if other is None: |
| 38 raise "I can't compare with a None. I am '%s'" % str(self) | |
| 0 | 39 if type(other) in (float, int): |
| 40 return cmp(self.time, other) | |
| 41 else: | |
| 42 return cmp(self.time, other.time) | |
| 43 def __repr__(self): | |
|
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44 return "<TimedEvent %s at %.2f, time=%.2f, next blender=%s>" % \ |
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45 (self.frame, self.level, self.time, self.next_blender) |
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46 def get_level(self): |
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47 return self.level |
| 123 | 48 def __hash__(self): |
| 49 return id(self.time) ^ id(self.frame) ^ id(self.next_blender) | |
| 0 | 50 |
| 51 class Blender: | |
| 52 """Blenders are functions that merge the effects of two LevelFrames.""" | |
| 53 def __init__(self): | |
| 54 pass | |
| 135 | 55 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 56 """Return a LevelFrame combining two LevelFrames (startframe and |
| 57 endframe). blendtime is how much of the blend should be performed | |
| 58 and will be expressed as a percentage divided by 100, i.e. a float | |
| 135 | 59 between 0.0 and 1.0. time_since_startframe is the time since the |
| 60 startframe was on screen in seconds (float). | |
| 0 | 61 |
| 62 Very important note: Blenders will *not* be asked for values | |
| 63 at end points (i.e. blendtime=0.0 and blendtime=1.0). | |
| 64 The LevelFrames will be allowed to specify the values at | |
| 65 those times. This is unfortunately for implemementation and | |
| 66 simplicity purposes. In other words, if we didn't do this, | |
| 67 we could have two blenders covering the same point in time and | |
| 68 not know which one to ask for the value. Thus, this saves us | |
| 69 a lot of messiness with minimal or no sacrifice.""" | |
| 70 pass | |
| 71 def __str__(self): | |
| 72 """As a default, we'll just return the name of the class. Subclasses | |
| 73 can add parameters on if they want.""" | |
| 74 return str(self.__class__) | |
| 75 def linear_blend(self, startframe, endframe, blendtime): | |
| 76 """Utility function to help you produce linear combinations of two | |
| 77 blends. blendtime is the percent/100 that the blend should | |
| 78 completed. In other words, 0.25 means it should be 0.75 * startframe + | |
| 79 0.25 * endframe. This function is included since many blenders are | |
| 80 just functions on the percentage and still combine start and end frames | |
| 81 in this way.""" | |
| 123 | 82 if startframe.frame == endframe.frame: |
| 135 | 83 level = startframe.level + (blendtime * \ |
| 84 (endframe.level - startframe.level)) | |
| 85 levels = {startframe.frame : level} | |
| 123 | 86 else: |
| 87 levels = {startframe.frame : (1.0 - blendtime) * startframe.level, | |
| 88 endframe.frame : blendtime * endframe.level} | |
| 89 return levels | |
| 0 | 90 |
| 91 class InstantEnd(Blender): | |
| 92 """Instant change from startframe to endframe at the end. In other words, | |
| 93 the value returned will be the startframe all the way until the very end | |
| 94 of the blend.""" | |
| 135 | 95 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 96 # "What!?" you say, "Why don't you care about blendtime?" |
| 97 # This is because Blenders never be asked for blenders at the endpoints | |
| 98 # (after all, they wouldn't be blenders if they were). Please see | |
| 99 # 'Very important note' in Blender.__doc__ | |
| 123 | 100 return {startframe.frame : startframe.level} |
| 0 | 101 |
| 102 class InstantStart(Blender): | |
| 103 """Instant change from startframe to endframe at the beginning. In other | |
| 104 words, the value returned will be the startframe at the very beginning | |
| 105 and then be endframe at all times afterwards.""" | |
| 135 | 106 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 107 # "What!?" you say, "Why don't you care about blendtime?" |
| 108 # This is because Blenders never be asked for blenders at the endpoints | |
| 109 # (after all, they wouldn't be blenders if they were). Please see | |
| 110 # 'Very important note' in Blender.__doc__ | |
| 123 | 111 return {endframe.frame : endframe.level} |
| 0 | 112 |
| 113 class LinearBlender(Blender): | |
| 114 """Linear fade from one frame to another""" | |
| 135 | 115 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 116 return self.linear_blend(startframe, endframe, blendtime) |
| 117 | |
| 118 class ExponentialBlender(Blender): | |
| 119 """Exponential fade fron one frame to another. You get to specify | |
| 120 the exponent. If my math is correct, exponent=1 means the same thing | |
| 121 as LinearBlender.""" | |
| 122 def __init__(self, exponent): | |
| 123 self.exponent = exponent | |
| 135 | 124 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 125 blendtime = blendtime ** self.exponent |
| 126 return self.linear_blend(startframe, endframe, blendtime) | |
| 127 | |
| 128 # 17:02:53 drewp: this makes a big difference for the SmoothBlender | |
| 129 # (-x*x*(x-1.5)*2) function | |
| 130 class SmoothBlender(Blender): | |
| 131 """Drew's "Smoove" Blender function. Hopefully he'll document and | |
| 132 parametrize it.""" | |
| 135 | 133 def __call__(self, startframe, endframe, blendtime, time_since_startframe): |
| 0 | 134 blendtime = (-1 * blendtime) * blendtime * (blendtime - 1.5) * 2 |
| 135 return self.linear_blend(startframe, endframe, blendtime) | |
| 136 | |
| 135 | 137 class Strobe(Blender): |
| 138 "Strobes the frame on the right side between offlevel and onlevel." | |
| 139 def __init__(self, ontime, offtime, onlevel=1, offlevel=0): | |
| 140 "times are in seconds" | |
| 141 make_attributes_from_args('ontime', 'offtime', 'onlevel', 'offlevel') | |
| 142 self.cycletime = ontime + offtime | |
| 143 def __call__(self, startframe, endframe, blendtime, time_since_startframe): | |
| 144 # time into the current period | |
| 145 period_time = time_since_startframe % self.cycletime | |
| 146 if period_time <= self.ontime: | |
| 147 return {endframe.frame : self.onlevel} | |
| 148 else: | |
| 149 return {endframe.frame : self.offlevel} | |
| 150 | |
| 0 | 151 class TimelineTrack: |
| 152 """TimelineTrack is a single track in a Timeline. It consists of a | |
| 153 list of TimedEvents and a name. Length is automatically the location | |
| 154 of the last TimedEvent. To extend the Timeline past that, add an | |
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155 EmptyTimedEvent (which doesn't exist :-/).""" |
| 135 | 156 def __init__(self, name, *timedevents, **kw): |
| 157 if kw.get('default_frame'): | |
| 158 self.default_frame = kw['default_frame'] | |
| 159 else: | |
| 160 self.default_frame = None | |
| 0 | 161 self.name = name |
| 109 | 162 self.events = list(timedevents) |
| 0 | 163 self.events.sort() |
| 135 | 164 self.fill_in_missing_subs() |
| 165 def fill_in_missing_subs(self): | |
| 166 for event in self.events: | |
| 167 if event.frame == MISSING: | |
| 168 event.frame = self.default_frame | |
| 0 | 169 def __str__(self): |
| 170 return "<TimelineTrack with events: %r>" % self.events | |
| 171 def has_events(self): | |
| 172 """Whether the TimelineTrack has anything in it. In general, | |
| 173 empty level Tracks should be avoided. However, empty function tracks | |
| 174 might be common.""" | |
| 175 return len(self.events) | |
| 176 def length(self): | |
| 177 """Returns the length of this track in pseudosecond time units. | |
| 178 This is done by finding the position of the last TimedEvent.""" | |
| 179 return float(self.events[-1]) | |
| 180 def get(self, key, direction=FORWARD): | |
| 181 """Returns the event at a specific time key. If there is no event | |
| 182 at that time, a search will be performed in direction. Also note | |
| 183 that if there are multiple events at one time, only the first will | |
| 184 be returned. (Probably first in order of adding.) This is not | |
| 185 a problem at the present since this method is intended for LevelFrames, | |
| 186 which must exist at unique times.""" | |
| 187 if direction == BACKWARD: | |
| 188 func = last_less_than | |
| 189 else: | |
| 190 func = first_greater_than | |
| 191 | |
| 192 return func(self.events, key) | |
| 193 def get_range(self, i, j, direction=FORWARD): | |
| 194 """Returns all events between i and j, exclusively. If direction | |
| 195 is FORWARD, j will be included. If direction is BACKWARD, i will | |
| 196 be included. This is because this is used to find FunctionFrames | |
| 197 and we assume that any function frames at the start point (which | |
| 198 could be i or j) have been processed.""" | |
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199 return [e for e in self.events if e >= i and e <= j] |
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200 |
| 0 | 201 if direction == FORWARD: |
| 202 return [e for e in self.events if e > i and e <= j] | |
| 203 else: | |
| 204 return [e for e in self.events if e >= i and e < j] | |
| 205 def __getitem__(self, key): | |
| 206 """Returns the event at or after a specific time key. | |
| 207 For example: timeline[3] will get the first event at time 3. | |
| 208 | |
| 209 If you want to get all events at time 3, you are in trouble, but | |
| 210 you could achieve it with something like: | |
| 211 timeline.get_range(2.99, 3.01, FORWARD) | |
| 212 This is hopefully a bogus problem, since you can't have multiple | |
| 213 LevelFrames at the same time.""" | |
| 214 return self.get(key, direction=FORWARD) | |
| 215 def get_surrounding_frames(self, time): | |
| 216 """Returns frames before and after a specific time. This returns | |
| 217 a 2-tuple: (previousframe, nextframe). If you have chosen the exact | |
| 218 time of a frame, it will be both previousframe and nextframe.""" | |
| 219 return self.get(time, direction=BACKWARD), \ | |
| 220 self.get(time, direction=FORWARD) | |
| 221 def get_levels_at_time(self, time): | |
| 222 """Returns a LevelFrame with the levels of this track at that time.""" | |
| 223 before, after = self.get_surrounding_frames(time) | |
| 224 | |
| 123 | 225 if not after or before == after: |
| 226 return {before.frame : before.level} | |
| 0 | 227 else: # we have a blended value |
| 228 diff = after.time - before.time | |
| 229 elapsed = time - before.time | |
| 230 percent = elapsed / diff | |
| 231 if not before.next_blender: | |
| 232 raise MissingBlender, before | |
| 135 | 233 return before.next_blender(before, after, percent, elapsed) |
| 0 | 234 |
| 235 class Timeline: | |
| 135 | 236 def __init__(self, name, tracks, rate=1, direction=FORWARD): |
| 0 | 237 """ |
|
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238 Most/all of this is old: |
| 0 | 239 |
| 240 You can have multiple FunctionFrames at the same time. Their | |
| 241 order is important though, since FunctionFrames will be applied | |
| 242 in the order seen in this list. blenders is a list of Blenders. | |
| 243 rate is the rate of playback. If set to 1, 1 unit inside the | |
| 244 Timeline will be 1 second. direction is the initial direction. | |
| 245 If you want to do have looping, place a LoopFunction at the end of | |
| 246 the Timeline. Timelines don't have a set length. Their length | |
| 247 is bounded by their last frame. You can put an EmptyFrame at | |
| 248 some time if you want to extend a Timeline.""" | |
| 249 | |
| 135 | 250 make_attributes_from_args('name', 'tracks', 'rate', 'direction') |
| 0 | 251 self.current_time = 0 |
| 252 self.last_clock_time = None | |
| 253 self.stopped = 1 | |
| 254 def length(self): | |
| 255 """Length of the timeline in pseudoseconds. This is determined by | |
| 256 finding the length of the longest track.""" | |
| 257 track_lengths = [track.length() for track in self.tracks] | |
| 258 return max(track_lengths) | |
| 259 def play(self): | |
| 260 """Activates the timeline. Future calls to tick() will advance the | |
| 261 timeline in the appropriate direction.""" | |
| 262 self.stopped = 0 | |
| 263 def stop(self): | |
| 264 """The timeline will no longer continue in either direction, no | |
| 265 FunctionFrames will be activated.""" | |
| 266 self.stopped = 1 | |
| 267 self.last_clock_time = None | |
| 268 def reset(self): | |
| 269 """Resets the timeline to 0. Does not change the stoppedness of the | |
| 270 timeline.""" | |
| 271 self.current_time = 0 | |
| 272 def tick(self): | |
| 273 """Updates the current_time and runs any FunctionFrames that the cursor | |
| 274 passed over. This call is ignored if the timeline is stopped.""" | |
| 275 if self.stopped: | |
| 276 return | |
| 277 | |
| 278 last_time = self.current_time | |
| 279 last_clock = self.last_clock_time | |
| 280 | |
| 281 # first, determine new time | |
| 282 clock_time = time() | |
| 283 if last_clock is None: | |
| 284 last_clock = clock_time | |
| 285 diff = clock_time - last_clock | |
| 286 new_time = (self.direction * self.rate * diff) + last_time | |
| 287 | |
| 288 # update the time | |
| 289 self.last_clock_time = clock_time | |
| 290 self.current_time = new_time | |
| 291 | |
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292 # now we make sure we're in bounds (we don't do this before, since it |
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293 # can cause us to skip events that are at boundaries. |
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294 self.current_time = max(self.current_time, 0) |
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295 self.current_time = min(self.current_time, self.length()) |
| 0 | 296 def reverse_direction(self): |
| 297 """Reverses the direction of play for this node""" | |
| 298 self.direction = self.direction * -1 | |
| 299 def set_direction(self, direction): | |
| 300 """Sets the direction of playback.""" | |
| 301 self.direction = direction | |
| 302 def set_rate(self, new_rate): | |
| 303 """Sets the rate of playback""" | |
| 304 self.rate = new_rate | |
| 305 def set_time(self, new_time): | |
| 306 """Set the time to a new time.""" | |
| 307 self.current_time = new_time | |
| 308 def get_levels(self): | |
| 309 """Return the current levels from this timeline. This is done by | |
| 310 adding all the non-functional tracks together.""" | |
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311 levels = [t.get_levels_at_time(self.current_time) |
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312 for t in self.tracks] |
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313 return dict_max(*levels) |
| 0 | 314 |
| 315 if __name__ == '__main__': | |
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316 def T(*args, **kw): |
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317 """This used to be a synonym for TimedEvent: |
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318 |
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319 T = TimedEvent |
| 0 | 320 |
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321 It now acts the same way, except that it will fill in a default |
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322 blender if you don't. The default blender is a LinearBlender.""" |
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323 linear = LinearBlender() |
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324 if 'blender' not in kw: |
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325 kw['blender'] = linear |
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326 |
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327 return TimedEvent(*args, **kw) |
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328 |
| 0 | 329 quad = ExponentialBlender(2) |
| 330 invquad = ExponentialBlender(0.5) | |
| 331 smoove = SmoothBlender() | |
| 332 | |
| 123 | 333 track1 = TimelineTrack('red track', |
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334 T(0, 'red', level=0), |
| 123 | 335 T(4, 'red', blender=quad, level=0.5), |
| 336 T(12, 'red', blender=smoove, level=0.7), | |
| 337 T(15, 'red', level=0.0)) # last TimedEvent doesn't need a blender | |
| 338 track2 = TimelineTrack('green track', | |
| 339 T(0, 'green', blender=invquad, level=0.2), | |
| 340 T(5, 'green', blender=smoove, level=1), | |
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341 T(10, 'green', level=0.8), |
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342 T(15, 'green', level=0.6), |
| 123 | 343 T(20, 'green', level=0.0)) # last TimedEvent doesn't need a blender |
| 344 track3 = TimelineTrack('tableau demo', | |
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345 T(0, 'blue', level=0.0), |
| 123 | 346 T(2, 'blue', level=1.0, blender=InstantEnd()), |
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347 T(18, 'blue', level=1.0), |
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348 T(20, 'blue', level=0.0)) |
| 0 | 349 |
| 135 | 350 tl = Timeline('test', [track1, track2, track3]) |
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351 |
| 0 | 352 tl.play() |
| 353 | |
| 354 import Tix | |
| 355 root = Tix.Tk() | |
| 356 colorscalesframe = Tix.Frame(root) | |
| 357 scalevars = {} | |
| 358 # wow, this works out so well, it's almost like I planned it! | |
| 359 # (actually, it's probably just Tk being as cool as it usually is) | |
| 360 # ps. if this code ever turns into mainstream code for flax, I'll be | |
| 361 # pissed (reason: we need to use classes, not this hacked crap!) | |
| 362 colors = 'red', 'blue', 'green', 'yellow', 'purple' | |
| 363 for color in colors: | |
| 364 sv = Tix.DoubleVar() | |
| 365 scalevars[color] = sv | |
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366 scale = Tix.Scale(colorscalesframe, from_=1, to_=0, res=0.01, bg=color, |
| 0 | 367 variable=sv) |
| 368 scale.pack(side=Tix.LEFT) | |
| 369 | |
| 370 def set_timeline_time(time): | |
| 371 tl.set_time(float(time)) | |
| 372 # print 'set_timeline_time', time | |
| 373 | |
| 374 def update_scales(): | |
| 375 levels = tl.get_levels() | |
| 376 for color in colors: | |
| 377 scalevars[color].set(levels.get(color, 0)) | |
| 378 | |
| 379 colorscalesframe.pack() | |
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8de8a2f467db
The "T" function now creates TimedEvents with LinearBlenders for you
dmcc
parents:
123
diff
changeset
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380 time_scale = Tix.Scale(root, from_=0, to_=tl.length(), |
| 0 | 381 orient=Tix.HORIZONTAL, res=0.01, command=set_timeline_time) |
| 382 time_scale.pack(side=Tix.BOTTOM, fill=Tix.X, expand=1) | |
| 383 | |
| 384 def play_tl(): | |
| 385 tl.tick() | |
| 386 update_scales() | |
| 387 time_scale.set(tl.current_time) | |
| 388 # print 'time_scale.set', tl.current_time | |
| 389 root.after(10, play_tl) | |
| 390 | |
| 391 controlwindow = Tix.Toplevel() | |
| 392 Tix.Button(controlwindow, text='Stop', | |
| 393 command=lambda: tl.stop()).pack(side=Tix.LEFT) | |
| 394 Tix.Button(controlwindow, text='Play', | |
| 395 command=lambda: tl.play()).pack(side=Tix.LEFT) | |
| 396 Tix.Button(controlwindow, text='Reset', | |
| 397 command=lambda: time_scale.set(0)).pack(side=Tix.LEFT) | |
| 398 Tix.Button(controlwindow, text='Flip directions', | |
| 399 command=lambda: tl.reverse_direction()).pack(side=Tix.LEFT) | |
| 400 Tix.Button(controlwindow, text='1/2x', | |
| 401 command=lambda: tl.set_rate(0.5 * tl.rate)).pack(side=Tix.LEFT) | |
| 402 Tix.Button(controlwindow, text='2x', | |
| 403 command=lambda: tl.set_rate(2 * tl.rate)).pack(side=Tix.LEFT) | |
| 404 | |
| 405 root.after(100, play_tl) | |
| 406 | |
| 407 # Timeline.set_time = trace(Timeline.set_time) | |
| 408 | |
| 409 Tix.mainloop() |