62 lines
2.3 KiB
Lua
62 lines
2.3 KiB
Lua
-- ChibiWave: a BaseChibi that bobs up and down while it runs, and may rock side to side.
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-- wave: { first = px from the run line to the first turn (+ is down), height = px between
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-- the turns, beats = beats per swing }
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-- sway: { first = degrees to the first lean (+ is forward), height = degrees between leans,
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-- beats = beats per rock } (optional)
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-- Both start when the chibi lands: the first swing only covers `first`, then each swing goes
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-- the full height, back and forth.
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local BaseChibi = require("background/bg_objects/chibi/base")
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local Timing = require("background/bg_objects/timing")
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local chain_moves, sum, Loop = Timing.chain_moves_lua, Timing.sum, Timing.Loop
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local Swing = {}
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Swing.__index = Swing
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function Swing.new(s, beat, unit, now)
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local self = setmetatable({}, Swing)
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local lead = s.beats * math.abs(s.first) / s.height
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local dir = s.first > 0 and -1 or 1
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self.lead = chain_moves({ { lead, s.first } }, beat, unit)
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self.lead_end = now + lead * beat
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self.loop = Loop.new(2 * s.beats * beat, function()
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return { v = chain_moves({ { s.beats, dir * s.height }, { s.beats, -dir * s.height } }, beat, unit) }
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end)
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return self
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end
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function Swing:update(now)
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for _, m in ipairs(self.lead) do m:update(now) end
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if now >= self.lead_end then self.loop:update(now) end
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end
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function Swing:value()
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return sum(self.lead) + (self.loop.anims and sum(self.loop.anims.v) or 0)
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end
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local ChibiWave = setmetatable({}, { __index = BaseChibi })
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ChibiWave.__index = ChibiWave
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function ChibiWave.new(spec, path, folder, bpm, is_2p)
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local self = setmetatable({}, ChibiWave)
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self:init(spec, path, folder, bpm, is_2p)
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return self
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end
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function ChibiWave:update_extra(current_time_ms)
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if self.hopping then return end
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local spec = self.spec
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self.bob = self.bob or Swing.new(spec.wave, self.beat, self.scale, current_time_ms)
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self.rock = self.rock or (spec.sway and Swing.new(spec.sway, self.beat, 1, current_time_ms))
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self.bob:update(current_time_ms)
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if self.rock then self.rock:update(current_time_ms) end
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end
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function ChibiWave:place()
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local at = BaseChibi.place(self)
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if self.bob then at.y = at.y + self.bob:value() / self.scale end
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if self.rock then at.rot = self.rock:value() end
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return at
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end
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return ChibiWave
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