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- Committer: Josh C
- Date: 2013-03-05 22:06:58 UTC
- Revision ID: josh@9ix.org-20130305220658-92yptjso9z57vzly
use zoetrope 288:a82a08660477 2013-02-23
- files added:
- zoetrope/core/collision.lua
- zoetrope/input
- files removed:
- zoetrope/core/gamepad.lua
- files modified:
- zoetrope/core/app.lua
added
removed
zoetrope/core/group.lua
5
5
-- Extends:
6
6
-- <Class>
7
7
--
8
--
9
8
-- Event: onUpdate
10
9
-- Called once each frame, with the elapsed time since the last frame in seconds.
11
10
--
52
49
-- sprites at their normal position, set both x and y to 1.
53
50
translateScale = { x = 1, y = 1 },
54
51
55
-- Property: gridSize
56
-- The size, in pixels, of the grid used for collision detection.
57
-- This partitions off space so that collision checks only need to do real
58
-- checks against a few sprites at a time. If you notice collision detection
59
-- taking a long time, changing this number may help.
60
gridSize = 50,
61
62
52
-- Method: add
63
53
-- Adds a sprite to the group.
64
54
--
106
96
end
107
97
end,
108
98
99
-- Method: moveToFront
100
-- Moves a sprite in the group so that it is drawn on top
101
-- of all other sprites in the group.
102
--
103
-- Arguments:
104
-- sprite - <Sprite> to move, should already be a member of the group
105
--
106
-- Returns:
107
-- nothing
108
109
moveToFront = function (self, sprite)
110
for i, spr in ipairs(self.sprites) do
111
if spr == sprite then
112
table.remove(self.sprites, i)
113
table.insert(self.sprites, sprite)
114
return
115
end
116
end
117
118
if STRICT then
119
print('Warning: asked to move sprite to front of group, but is not a member: ' .. sprite)
120
end
121
end,
122
123
-- Method: moveToBack
124
-- Moves a sprite in the group so that it is drawn below
125
-- all other sprites in the group.
126
--
127
-- Arguments:
128
-- sprite - <Sprite> to move, should already be a member of the group
129
--
130
-- Returns:
131
-- nothing
132
133
moveToBack = function (self, sprite)
134
for i, spr in ipairs(self.sprites) do
135
if spr == sprite then
136
table.remove(self.sprites, i)
137
table.insert(self.sprites, 1, sprite)
138
return
139
end
140
end
141
142
if STRICT then
143
print('Asked to move sprite to back of group, but is not a member: ' .. sprite)
144
end
145
end,
146
147
-- Method: sort
148
-- Sorts members into a new draw sequence.
149
--
150
-- Arguments:
151
-- func - function to perform the sort. This will receive two <Sprite>s as arguments;
152
-- the function must return whether the first should be drawn below the second.
153
--
154
-- Returns:
155
-- nothing
156
157
sort = function (self, func)
158
table.sort(self.sprites, func)
159
end,
160
109
161
-- Method: collide
110
162
-- Collides all solid sprites in the group with another sprite or group.
111
163
-- This calls the <Sprite.onCollide> event handlers on all sprites that
115
167
-- This checks for collisions between the sprites that make up the group.
116
168
--
117
169
-- Arguments:
118
-- other - <Sprite> or <Group> to collide with, default self
170
-- ... - any number of <Sprite>s or <Group>s to collide with. If none
171
-- are specified, the group collides with itself.
119
172
--
120
173
-- Returns:
121
-- boolean, whether any collision was detected
174
-- nothing
122
175
--
123
176
-- See Also:
124
177
-- <Sprite.collide>
125
178
126
collide = function (self, other)
127
other = other or self
128
129
if STRICT then
130
assert(other:instanceOf(Group) or other:instanceOf(Sprite), 'asked to collide non-group/sprite ' ..
131
type(other))
132
end
133
134
if not self.solid or not other.solid then return false end
135
local hit = false
136
137
if other.sprites then
138
local grid = self:grid()
139
local gridSize = self.gridSize
140
141
for _, othSpr in pairs(other.sprites) do
142
local startX = math.floor(othSpr.x / gridSize)
143
local endX = math.floor((othSpr.x + othSpr.width) / gridSize)
144
local startY = math.floor(othSpr.y / gridSize)
145
local endY = math.floor((othSpr.y + othSpr.height) / gridSize)
146
147
for x = startX, endX do
148
if grid[x] then
149
for y = startY, endY do
150
if grid[x][y] then
151
for _, spr in pairs(grid[x][y]) do
152
hit = spr:collide(othSpr) or hit
153
end
154
end
155
end
156
end
157
end
158
end
159
else
160
for _, spr in pairs(self.sprites) do
161
hit = spr:collide(other) or hit
162
end
163
end
164
165
return hit
166
end,
167
168
-- Method: displace
169
-- Displaces a sprite or group by all solid sprites in this group. This will *not* cause
170
-- any onCollide event handlers to be called.
171
--
172
-- Arguments:
173
-- other - <Sprite> or <Group> to collide with, default self
174
-- xHint - force horizontal displacement in one direction, uses direction constants, optional
175
-- yHint - force vertical displacement in one direction, uses direction constants, optional
176
--
177
-- Returns:
178
-- nothing
179
--
180
-- See Also:
181
-- <Sprite.displace>
182
183
displace = function (self, other, xHint, yHint)
184
other = other or self
185
186
if STRICT then
187
assert(other:instanceOf(Group) or other:instanceOf(Sprite), 'asked to displace non-group/sprite ' ..
188
type(other))
189
end
190
191
if not self.solid or not other.solid then return false end
192
193
if other.sprites then
194
-- group displacing group
195
196
local grid = self:grid()
197
local gridSize = self.gridSize
198
199
for _, othSpr in pairs(other.sprites) do
200
local startX = math.floor(othSpr.x / gridSize)
201
local endX = math.floor((othSpr.x + othSpr.width) / gridSize)
202
local startY = math.floor(othSpr.y / gridSize)
203
local endY = math.floor((othSpr.y + othSpr.height) / gridSize)
204
local displacers = {}
205
206
for x = startX, endX do
207
if grid[x] then
208
for y = startY, endY do
209
if grid[x][y] then
210
for _, spr in pairs(grid[x][y]) do
211
if spr ~= othSpr and spr.solid and spr:intersects(othSpr.x, othSpr.y, othSpr.width, othSpr.height) then
212
table.insert(displacers, spr)
213
end
214
end
215
end
216
end
217
end
218
end
219
220
-- see Map:subdisplace() for how this is done
221
222
if #displacers > 0 then
223
local hit = true
224
local loops = 0
225
226
while hit and loops < 3 do
227
hit = false
228
loops = loops + 1
229
230
local xVotes, yVotes = 0, 0
231
local minChangeX, minChangeY, absMinChangeX, absMinChangeY
232
local origX, origY = othSpr.x, othSpr.y
233
234
for _, spr in pairs(displacers) do
235
spr:displace(othSpr)
236
local xChange = othSpr.x - origX
237
local yChange = othSpr.y - origY
238
239
if xChange ~= 0 then
240
xVotes = xVotes + math.abs(xChange)
241
hit = true
242
243
if not minChangeX or math.abs(xChange) < absMinChangeX then
244
minChangeX = xChange
245
absMinChangeX = math.abs(xChange)
246
end
247
end
248
249
if yChange ~= 0 then
250
yVotes = yVotes + math.abs(yChange)
251
hit = true
252
253
if not minChangeY or math.abs(yChange) < absMinChangeY then
254
minChangeY = yChange
255
absMinChangeY = math.abs(yChange)
256
end
257
end
258
259
-- restore sprite to original position
260
261
othSpr.x = origX
262
othSpr.y = origY
263
end
264
265
if hit then
266
if xVotes > 0 and xVotes > yVotes then
267
othSpr.x = othSpr.x + minChangeX
268
elseif yVotes > 0 then
269
othSpr.y = othSpr.y + minChangeY
270
end
271
end
272
end
273
end
274
end
275
else
276
-- group displacing sprite
277
278
local displacers = {}
279
280
for _, spr in pairs(self.sprites) do
281
if spr ~= other and spr:intersects(other.x, other.y, other.width, other.height) then
282
table.insert(displacers, spr)
283
end
284
end
285
286
-- see Map:subdisplace() for how this is done
287
288
if #displacers > 0 then
289
local hit = true
290
local loops = 0
291
292
while hit and loops < 3 do
293
hit = false
294
loops = loops + 1
295
296
local xVotes, yVotes = 0, 0
297
local minChangeX, minChangeY, absMinChangeX, absMinChangeY
298
local origX, origY = other.x, other.y
299
300
for _, spr in pairs(displacers) do
301
spr:displace(other)
302
local xChange = other.x - origX
303
local yChange = other.y - origY
304
305
if xChange ~= 0 then
306
xVotes = xVotes + math.abs(xChange)
307
hit = true
308
309
if not minChangeX or math.abs(xChange) < absMinChangeX then
310
minChangeX = xChange
311
absMinChangeX = math.abs(xChange)
312
end
313
end
314
315
if yChange ~= 0 then
316
yVotes = yVotes + math.abs(yChange)
317
hit = true
318
319
if not minChangeY or math.abs(yChange) < absMinChangeY then
320
minChangeY = yChange
321
absMinChangeY = math.abs(yChange)
322
end
323
end
324
325
-- restore sprite to original position
326
327
other.x = origX
328
other.y = origY
329
end
330
331
if hit then
332
if xVotes > 0 and xVotes > yVotes then
333
other.x = other.x + minChangeX
334
elseif yVotes > 0 then
335
other.y = other.y + minChangeY
336
end
337
end
338
end
339
end
179
collide = function (self, ...)
180
local list = {...}
181
182
if #list > 0 then
183
if STRICT then
184
for _, other in pairs(list) do
185
assert(other:instanceOf(Group) or other:instanceOf(Sprite), 'asked to collide non-group/sprite ' ..
186
type(other))
187
end
188
end
189
190
Collision:check(self, ...)
191
else
192
Collision:check(self, self)
340
193
end
341
194
end,
342
195
460
313
return false
461
314
end,
462
315
463
-- Method: grid
464
-- Creates a table indexed by x and y dimensions, with each
465
-- cell a table of sprites that touch this grid element. For
466
-- example, with a grid size of 50, a sprite at (10, 10) that
467
-- is 50 pixels square would be in the grid at [0][0], [1][0],
468
-- [0][1], and [1][1].
469
--
470
-- This can be used to speed up work that involves checking
471
-- for sprites near each other, e.g. collision detection.
316
-- Method: loadLayers
317
-- Loads layers from a Lua source file (as generated by Tiled -- http://mapeditor.org).
318
-- Each layer is created as a <Group> belonging to this one and added to preserve its
319
-- ordering. Tile layers are created as <Map> instances; object layers will try to create
320
-- instances of a class named by the object's name property. If no class exists by
321
-- this name, or the object has no name property, a gray fill will be created instead,
322
-- as a placeholder. If the object has a property named _the, then this will set
323
-- the.[whatever] to it.
472
324
--
473
325
-- Arguments:
474
-- existing - existing grid table to add sprites into,
475
-- optional. Anything you pass must have
476
-- used the same size as the current call.
326
-- file - filename to load
327
-- tileClass - class to create tiles in tile layers with; constructor
328
-- will be called with properties: image, width,
329
-- height, imageOffset (with x and y sub-properties)
477
330
--
478
331
-- Returns:
479
-- table
480
481
grid = function (self, existing)
482
local result = existing or {}
483
local size = self.gridSize
484
485
for _, spr in pairs(self.sprites) do
486
if spr.sprites then
487
local oldSize = spr.gridSize
488
spr.gridSize = self.gridSize
489
result = spr:grid(result)
490
spr.gridSize = oldSize
491
else
492
local startX = math.floor(spr.x / size)
493
local endX = math.floor((spr.x + spr.width) / size)
494
local startY = math.floor(spr.y / size)
495
local endY = math.floor((spr.y + spr.height) / size)
496
497
for x = startX, endX do
498
if not result[x] then result[x] = {} end
499
500
for y = startY, endY do
501
if not result[x][y] then result[x][y] = {} end
502
table.insert(result[x][y], spr)
503
end
504
end
505
end
332
-- nothing
333
334
loadLayers = function (self, file, tileClass)
335
local ok, data = pcall(loadstring(Cached:text(file)))
336
local _, _, directory = string.find(file, '^(.*[/\\])')
337
directory = directory or ''
338
339
if ok then
340
-- store tile properties by gid
341
342
local tileProtos = {}
343
344
for _, tileset in pairs(data.tilesets) do
345
for _, tile in pairs(tileset.tiles) do
346
local id = tileset.firstgid + tile.id
347
348
for key, value in pairs(tile.properties) do
349
tile.properties[key] = tovalue(value)
350
end
351
352
tileProtos[id] = tile
353
tileProtos[id].width = tileset.tilewidth
354
tileProtos[id].height = tileset.tileheight
355
end
356
end
357
358
for _, layer in pairs(data.layers) do
359
if self.prototype[layer.name] then
360
error('The class you are loading layers into reserves the ' .. layer.name .. ' property for its own use; you cannot load a layer with that name')
361
end
362
363
if STRICT and self[layer.name] then
364
local info = debug.getinfo(2, 'Sl')
365
print('Warning: a property named ' .. layer.name .. ' already exists in this group (' ..
366
info.short_src .. ', line ' .. info.currentline .. ')')
367
end
368
369
if layer.type == 'tilelayer' then
370
local map = Map:new{ spriteWidth = data.tilewidth, spriteHeight = data.tileheight }
371
map:empty(layer.width, layer.height)
372
373
-- load tiles
374
375
for _, tiles in pairs(data.tilesets) do
376
map:loadTiles(directory .. tiles.image, tileClass or Tile, tiles.firstgid)
377
378
-- and mix in properties where applicable
379
380
for id, tile in pairs(tileProtos) do
381
if map.sprites[id] then
382
map.sprites[id]:mixin(tile.properties)
383
end
384
end
385
end
386
387
-- load tile data
388
389
local x = 1
390
local y = 1
391
392
for _, val in ipairs(layer.data) do
393
map.map[x][y] = val
394
x = x + 1
395
396
if x > layer.width then
397
x = 1
398
y = y + 1
399
end
400
end
401
402
self[layer.name] = map
403
self:add(map)
404
elseif layer.type == 'objectgroup' then
405
local group = Group:new()
406
407
for _, obj in pairs(layer.objects) do
408
-- roll in tile properties if based on a tile
409
410
if obj.gid and tileProtos[obj.gid] then
411
local tile = tileProtos[obj.gid]
412
413
obj.name = tile.properties.name
414
obj.width = tile.width
415
obj.height = tile.height
416
417
for key, value in pairs(tile.properties) do
418
obj.properties[key] = tovalue(value)
419
end
420
421
-- Tiled tile-based objects measure their y
422
-- position at their lower-left corner, instead
423
-- of their upper-left corner as usual
424
425
obj.y = obj.y - obj.height
426
end
427
428
-- create a new object if the class does exist
429
430
local spr
431
432
if _G[obj.name] then
433
obj.properties.x = obj.x
434
obj.properties.y = obj.y
435
obj.properties.width = obj.width
436
obj.properties.height = obj.height
437
438
spr = _G[obj.name]:new(obj.properties)
439
else
440
spr = Fill:new{ x = obj.x, y = obj.y, width = obj.width, height = obj.height, fill = { 128, 128, 128 } }
441
end
442
443
if obj.properties._the then
444
the[obj.properties._the] = spr
445
end
446
447
group:add(spr)
448
end
449
450
self[layer.name] = group
451
self:add(group)
452
else
453
error("don't know how to create a " .. layer.type .. " layer from file data")
454
end
455
end
456
else
457
error('could not load layers from file: ' .. data)
506
458
end
507
508
return result
509
459
end,
510
460
511
461
-- passes startFrame events to member sprites
513
463
startFrame = function (self, elapsed)
514
464
if not self.active then return end
515
465
elapsed = elapsed * self.timeScale
466
467
for _, spr in pairs(self.sprites) do
468
if spr.active then spr:startFrame(elapsed) end
469
end
470
516
471
if self.onStartFrame then self:onStartFrame(elapsed) end
517
518
for _, spr in pairs(self.sprites) do
519
if spr.active then spr:startFrame(elapsed) end
520
end
521
472
end,
522
473
523
474
-- passes update events to member sprites
525
476
update = function (self, elapsed)
526
477
if not self.active then return end
527
478
elapsed = elapsed * self.timeScale
479
480
for _, spr in pairs(self.sprites) do
481
if spr.active then spr:update(elapsed) end
482
end
483
528
484
if self.onUpdate then self:onUpdate(elapsed) end
529
530
for _, spr in pairs(self.sprites) do
531
if spr.active then spr:update(elapsed) end
532
end
533
485
end,
534
486
535
487
-- passes endFrame events to member sprites
537
489
endFrame = function (self, elapsed)
538
490
if not self.active then return end
539
491
elapsed = elapsed * self.timeScale
492
493
for _, spr in pairs(self.sprites) do
494
if spr.active then spr:endFrame(elapsed) end
495
end
496
540
497
if self.onEndFrame then self:onEndFrame(elapsed) end
541
542
for _, spr in pairs(self.sprites) do
543
if spr.active then spr:endFrame(elapsed) end
544
end
545
498
end,
546
499
547
500
-- Method: draw
589
542
end
590
543
end
591
544
592
if self.onDraw then self:onDraw() end
593
594
545
if self.effect then
595
546
if self.effectType == 'screen' then
596
547
love.graphics.setPixelEffect(self.effect)
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