方寸棋局：画个圈圈困住你

fx-chessfield

local ChessField = {}
local KEY = { SIZE = 190 }
local field = nil      -- { gen, x, y, w, h }

local function WallGen()
    return field and field.gen or 0
end

function ChessField.Cast(self_, target)
    field = {
        gen = (field and field.gen or 0) + 1,
        x = SL:GetValue("actorX", target) - KEY.SIZE / 2,
        y = SL:GetValue("actorY", target) - 150,
        w = KEY.SIZE, h = 172,
        bounces = 0
    }
    SL:PlayFxAt("board_drop", field.x + field.w / 2, field.y)
    local myGen = field.gen
    -- 困锁计时
    SL:ScheduleOnce(function()
        if not field or field.gen ~= myGen then return end   -- 代币校验
        ChessField.Dissolve()
    end, 4)
end

-- 引擎位移回调: 每帧校验四墙
function ChessField.OnMove(target)
    if not field then return end
    local x = SL:GetValue("actorX", target)
    local vx = SL:GetValue("actorVX", target)
    local left, right = field.x + 26, field.x + field.w - 26
    if x < left and vx < 0 then
        SL:SetActorVelocity(target, -vx, 0)
        ChessField.OnBounce("left")
    elseif x > right and vx > 0 then
        SL:SetActorVelocity(target, -vx, 0)
        ChessField.OnBounce("right")
    end
end

function ChessField.OnBounce(which)
    field.bounces = field.bounces + 1
    local bx = which == "left" and field.x or field.x + field.w
    local by = SL:GetValue("actorY", SL:GetValue("curTarget")) - 50
    SL:PlayFxAt("wall_ripple", bx, by)
    SL:PlayActorAct(SL:GetValue("curTarget"), "stuck")
    SL:ShowTipAbove(SL:GetValue("curTarget"), "咚!")
end

function ChessField.Dissolve()
    SL:PlayFxAt("board_break", field.x + field.w / 2, field.y + field.h)
    field = nil
end

return ChessField