掷镖九宫：正中红心那一下最响

local score = RingScore(math.sqrt((x-cx)^2 + (y-cy)^2))

fx-dartboard

local DartBoard = {}
local KEY = { CX = 300, CY = 160, R = 120, ROUND = 5 }

local function RingScore(dist)
    if dist < 12 then return 50 end          -- 红心
    if dist < KEY.R * 0.22 then return 25 end
    if dist < KEY.R * 0.45 then return 15 end
    if dist < KEY.R * 0.7 then return 10 end
    if dist < KEY.R then return 5 end
    return 0                                  -- 脱靶
end

function Dart.Throw(accuracy)
    local ang = math.random() * 6.28
    local dist = (1 - accuracy) * KEY.R * (0.4 + math.random() * 0.6)
    local tx = KEY.CX + math.cos(ang) * dist
    local ty = KEY.CY + math.sin(ang) * dist
    SL:PlayFlyFx("dart", 60, SL:GetValue("height") - 50,
                 tx, ty, 2, { arc = 50 }, function()
        SL:PinDart(tx, ty)                    -- 镖钉盘, 带颤动
        local sc = RingScore(math.sqrt((tx-KEY.CX)^2 + (ty-KEY.CY)^2))
        SL:SetValue("roundScore", SL:GetValue("roundScore") + sc)
        if sc == 50 then
            SL:FlashScreen("#ffe2a8", 0.1)
            SL:PlayFxAt("bull_ring", KEY.CX, KEY.CY)
            SL:ShowHitNum(KEY.CX, KEY.CY - 40, "bullseye")
        else
            SL:ShowTipAt(tx, ty, "+" .. sc)
        end
        SL:PlaySfx("thud")
        SL:SendEvent("dart_landed", sc)
    end)
end

function DartBoard.RoundEnd()
    if SL:GetValue("dartCount") >= KEY.ROUND then
        SL:ScheduleOnce(function()
            SL:ShowSystemTips("五镖 " .. SL:GetValue("roundScore") .. " 分")
            SL:ClearDarts()
            SL:SetValue("roundScore", 0)
            SL:SetValue("dartCount", 0)
        end, 1.5)
    end
end

return DartBoard