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The state quries the user for four values: ref. picnum, target picnum, max. ldist and a lotag. Then, for all sprites i (of ref. picnum), for all sprites j (of target picnum), if ldist(i,j)<=maxldist, sprite j's lotag is changed to the provided one. Also add lunatic/test/maputil.lua, containing a similar function but allowing to customize the selection predicates of the ref. and target sprites, as well as the action to carry out. git-svn-id: https://svn.eduke32.com/eduke32@4414 1a8010ca-5511-0410-912e-c29ae57300e0
63 lines
2 KiB
Lua
63 lines
2 KiB
Lua
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local xmath = require("xmath")
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local sprite = sprite
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--
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local maputil = {}
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-- csfunc = maputil.CreateCrossSpriteFunc(use_sprite_i_func, use_sprite_j_func)
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--
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-- use_sprite_i_func: function(spri, ud), where
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-- <spri> is a reference to sprite i
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-- use_sprite_j_func: function(sprj, spri, ud), where
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-- <spri> is a reference to sprite i
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-- <sprj> is a reference to sprite j
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--
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-- csfunc: function(userdata, process_sprite_j_func), where
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-- <userdata> is passed as <ud> to the functions described above
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-- <process_sprite_j_func>: function(sprj, spri, ud), the user-provided
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-- function that processes sprite j in some way
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function maputil.CreateCrossSpriteFunc(use_sprite_i_func, use_sprite_j_func)
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return function(userdata, process_sprite_j_func)
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for i in sprite.all() do
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if (use_sprite_i_func(sprite[i], userdata)) then
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for j in sprite.all() do
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if (use_sprite_j_func(sprite[j], sprite[i], userdata)) then
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process_sprite_j_func(sprite[j], sprite[i], userdata)
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end
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end
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end
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end
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end
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end
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-- Functions for "for all sprites Y of tile X that are closer than D, ..."
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-- Passed userdefs: { picnumi, picnumj, maxldist }
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local function snearpic_usei(spr, ud)
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return spr.picnum == ud[1]
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end
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local function snearpic_usej(sprj, spri, ud)
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return sprj.picnum == ud[2] and xmath.ldist(spri, sprj) <= ud[3]
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end
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local snearpic_func = maputil.CreateCrossSpriteFunc(snearpic_usei, snearpic_usej)
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-- maputil.for_sprites_near_picnum(picnumi, picnumj, dist, process_sprite_func)
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--
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-- Runs the following loop:
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--
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-- for all sprites i with tile <picnumi>,
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-- for all sprites j of tile <picnumj> that are closer to sprite i than <dist> [*],
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-- call process_sprite_func(sprite[j], sprite[i])
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--
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-- [*] using xmath.ldist()
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function maputil.for_sprites_near_picnum(picnumi, picnumj, dist, process_sprite_func)
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snearpic_func({picnumi, picnumj, dist}, process_sprite_func)
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end
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return maputil
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