initial commit

src/ui/TradeAnim.lua

@@ -0,0 +1,102 @@
+-- Link/in-game trade cinematic (engine/movie/trade.asm, trade2.asm):
+-- the traded POKéMON rises away with its cry and a goodbye, then the
+-- received one descends with its cry and "take good care" text.
+-- A skips the slide animations ahead.  Calls onDone() after popping.
+
+local Sound = require("src.core.Sound")
+local TextBox = require("src.render.TextBox")
+
+local TradeAnim = {}
+TradeAnim.__index = TradeAnim
+TradeAnim.isOpaque = true
+
+-- SGB: generic whole-screen palette (SET_PAL_GENERIC)
+function TradeAnim:sgbPalettes(game)
+  return require("src.render.PaletteFX").wholeNamed(game.data, "MEWMON")
+end
+
+local SLIDE_FRAMES = 90
+local REST_Y = 44 -- resting top of the sprite, roughly screen centre
+
+local function tryImage(path)
+  if not path then return nil end
+  local ok, img = pcall(love.graphics.newImage, path)
+  return ok and img or nil
+end
+
+local function nameOf(game, mon)
+  local def = game.data.pokemon[mon.species]
+  return mon.nickname or (def and def.name) or mon.species
+end
+
+local function spriteOf(game, mon)
+  local def = game.data.pokemon[mon.species]
+  return tryImage(def and def.spriteFront)
+end
+
+function TradeAnim.new(game, opts)
+  opts = opts or {}
+  local self = setmetatable({}, TradeAnim)
+  self.game = game
+  self.sent = opts.sent
+  self.received = opts.received
+  self.onDone = opts.onDone
+  self.sentSprite = spriteOf(game, self.sent)
+  self.receivedSprite = spriteOf(game, self.received)
+  self.phase = "out"
+  self.t = 0
+  return self
+end
+
+function TradeAnim:enter()
+  Sound.playCry(self.game.data, self.sent.species)
+end
+
+function TradeAnim:update(dt)
+  local input = self.game.input
+  if self.phase == "out" or self.phase == "in" then
+    self.t = self.t + 1
+    if input:wasPressed("a") then self.t = SLIDE_FRAMES end
+    if self.t < SLIDE_FRAMES then return end
+    if self.phase == "out" then
+      self.phase = "goodbye"
+      self.game.stack:push(TextBox.new(self.game,
+        ("Goodbye %s!"):format(nameOf(self.game, self.sent)),
+        function()
+          self.phase = "in"
+          self.t = 0
+          Sound.playCry(self.game.data, self.received.species)
+        end))
+    else
+      self.phase = "takecare"
+      self.game.stack:push(TextBox.new(self.game,
+        ("Take good care\nof %s!"):format(nameOf(self.game, self.received)),
+        function()
+          self.game.stack:pop()
+          if self.onDone then self.onDone() end
+        end))
+    end
+  end
+end
+
+function TradeAnim:draw()
+  love.graphics.setColor(1, 1, 1, 1)
+  love.graphics.rectangle("fill", 0, 0, 160, 144)
+  local sprite, y
+  if self.phase == "out" then
+    -- the sent mon rises up and off the screen
+    sprite = self.sentSprite
+    y = REST_Y - math.floor((self.t / SLIDE_FRAMES) * (REST_Y + 60))
+  elseif self.phase == "in" or self.phase == "takecare" then
+    -- the received mon descends into place
+    sprite = self.receivedSprite
+    local t = self.phase == "in" and self.t or SLIDE_FRAMES
+    y = -60 + math.floor((t / SLIDE_FRAMES) * (REST_Y + 60))
+  end
+  if sprite and y then
+    local w = sprite:getWidth()
+    love.graphics.draw(sprite, math.floor((160 - w) / 2), y)
+  end
+end
+
+return TradeAnim