刮开涂层见真章：指尖刮的快感

fx-scratch

local ScratchCard = {}
local CONST = { MSG_ID = 12220, KEY = "ScratchCard", AUTO_CLEAR = 60 }

function ScratchCard.OnCardShown(cardID)
    ScratchCard._card = cardID
    ScratchCard._cleared = 0
    -- 幂尔接线: 触摸事件挂GUI层画布
    GUI:RegisterCanvasTouch(cardID, function(phase, x, y)
        if phase == "move" then ScratchCard:Scratch(x, y) end
    end)
end

function ScratchCard:Scratch(x, y)
    -- 橡皮擦: destination-out 挖掉涂层
    self._canvas:EraseCircle(x, y, self._brush)
    self._acc = (self._acc or 0) + 1
    if self._acc % 10 == 0 then                        -- 每10次擦除统计一次进度
        self._cleared = self._canvas:SampleAlphaRatio()
        if self._cleared >= CONST.AUTO_CLEAR then
            self._canvas:ClearAll()
            self:Submit()                              -- 全清即结算
        end
    end
end

function ScratchCard:Submit()
    SL:SendLuaNetMsg(CONST.MSG_ID, 0, 0, 0,
        SL:JsonEncode({ key = CONST.KEY, card = self._card }))
    SL:ShowSystemTips("刮完了!")
end

SL:RegisterLuaNetMsg(CONST.MSG_ID, function(_, p1, p2, p3, msgData)
    local d = SL:JsonDecode(msgData)
    if d.key ~= CONST.KEY then return end
    SL:ShowSystemTips("获得: " .. d.reward)
end)

return ScratchCard