拾取 / 丢弃物品

一、拾取：scripts/页面/校园地图.lua → CreateObjectDot

lua
local function CreateObjectDot(object, context)
    local interactionText = PlayerInteractionService.GetObjectInteraction(object)
    -- 命中区 = 包裹 placement 与 visual 的最小外接矩形（visual 偏移常比 footprint 大）
    local placementWidth  = object.placementWidth  or object.w or 1
    local placementHeight = object.placementHeight or object.h or 1
    local visualWidth  = object.visualWidth  or object.w or placementWidth
    local visualHeight = object.visualHeight or object.h or placementHeight
    local visualOffsetX = (placementWidth  - visualWidth)  * 0.5
    local visualOffsetY = (placementHeight - visualHeight) * 0.5
    local minGx = math.min(0, visualOffsetX)
    local maxGx = math.max(placementWidth, visualOffsetX + visualWidth)
    local minGy = math.min(0, visualOffsetY)
    local maxGy = math.max(placementHeight, visualOffsetY + visualHeight)
    local effectiveW = maxGx - minGx
    local effectiveH = maxGy - minGy

    local visualWidget = object.image and UI.Panel {
        position = "absolute",
        left = (visualOffsetX - minGx) * 5, top = (visualOffsetY - minGy) * 5,
        width = math.max(5, visualWidth * 5), height = math.max(5, visualHeight * 5),
        backgroundImage = object.image, backgroundFit = "contain",
        backgroundColor = { 0, 0, 0, 0 }, pointerEvents = "none",
    } or nil

    return UI.Panel {
        position = "absolute",
        left = (object.x + minGx) * 5, top = (object.y + minGy) * 5,
        width = math.max(5, effectiveW * 5), height = math.max(5, effectiveH * 5),
        backgroundColor = object.image and { 0, 0, 0, 0 } or { 210, 198, 160, 220 },
        borderWidth = interactionText and 1 or 0,
        borderColor = interactionText and { 235, 190, 90, 220 } or { 40, 36, 28, 255 },
        tooltip = interactionText,
        visible = not object.pickedUp,
        -- ★ 关键修复：可交互物品必须浮在主角标记（无 zIndex）之上，否则被遮挡点不中
        zIndex = interactionText and 20 or 0,
        children = visualWidget and { visualWidget } or nil,
        -- 只有可交互物品才有点击处理器（否则为 nil，不可点）
        onClick = interactionText and function(widget, event)
            -- ★ 右键守卫：只屏蔽右键（平移），不要写 event.button ~= MOUSEB_LEFT（MOUSEB_LEFT 未暴露为全局）
            if event and event.button and event.button == MOUSEB_RIGHT then return end
            if event then event:StopPropagation() end
            local ok, reason = PlayerInteractionService.PickupAny(context, object.id)
            if not ok and reason and context.store and context.store.AddEvent then
                context.store.AddEvent("无法拾取：" .. tostring(reason), "物品交互")
            end
            context.RebuildUI()
        end or nil,
    }
end

lua
local INTERACTION_DISTANCE = 8

local function DistanceTo(player, x, y)
    local px, py = ActorSpatialService.GetPosition(player.id)  -- ★ 读实时坐标
    px = px or player.x or 0; py = py or player.y or 0
    local dx, dy = px - x, py - y
    return math.sqrt(dx * dx + dy * dy)
end

function PlayerInteractionService.PickupAny(context, objectId)
    local player = GetPlayer()
    if not player then return false, "主角不存在" end
    local object = FindObject(objectId)
    if not object then return false, "物件不存在" end
    if object.pickedUp or object.carriedBy then return false, "已拾取/被拿走" end
    if object.interactable ~= true then return false, "不可交互" end
    if object.carryable  ~= true then return false, "不可携带" end
    if DistanceToObject(player, object) > INTERACTION_DISTANCE then
        return false, "请先走到物件附近"
    end
    object.carriedBy = player.id
    object.pickedUp = true
    -- 手持空且有 equipSlot → 装备；否则入背包 ...
    return true
end

二、丢弃：scripts/界面组件/底部物品栏.lua → 拖拽 pointerup

lua
slot:OnEvent("pointerup", function(event, widget)
    if not dragState_ then return end
    if not dragState_.active then          -- 没拖够阈值 = 点击
        ClearDrag(); if onClick then onClick() end; return
    end

    local gx, gy = event.x, event.y
    local CampusMap = require("页面.校园地图")
    local wx, wy = CampusMap.ScreenToWorld(gx, gy)   -- 仅用于"是否拖到某人身上"的命中检测
    local interactSvc = require("系统.主角交互服务")
    local success, action = false, "cancel"

    local target = nil
    if wx and wy then target = HitTestCharacter(wx, wy, context) end

    if target then
        -- 分支 A：拖到小人身上 → 扔给该人（不限距离）
        local ok, reason
        if dragState_.source == "held" then
            ok, reason = interactSvc.ThrowHeldItemTo(context, target.id)
        else
            ok, reason = interactSvc.ThrowInventoryItemTo(context, target.id, dragState_.source.fromInventory)
        end
        if ok then success = true; action = "throw" end
    else
        -- 分支 B：★ 丢到玩家脚底 —— 直接读玩家空间坐标，绝不用 ScreenToWorld 当落点
        local ActorSpatialService = require("系统.小人空间服务")
        local StudentService = require("系统.学生服务")
        local pchar = StudentService.GetPlayerCharacter(context.store.GetState())
        local fx, fy = nil, nil
        if pchar then
            fx, fy = ActorSpatialService.GetPosition(pchar.id)
            fx = fx or pchar.x; fy = fy or pchar.y
        end
        if fx and fy then
            local ok, reason = interactSvc.DropItemAt(context, dragState_.source, fx, fy)
            if ok then success = true; action = "drop" end
        end
    end

    ClearDrag()
    if context.RequestUIRebuild then context.RequestUIRebuild() else context.RebuildUI() end
end)

三个可复用的「避雷口诀」

1. 同父容器的命中层叠看 zIndex：需要被点的交互层（物品、按钮命中区）必须显式给 zIndex，否则会被数组中靠后、无 zIndex 的层（如主角标记）盖住。
2. MOUSEB_LEFT 在本环境不是全局（为 nil）。右键守卫只能写 if event.button == MOUSEB_RIGHT then return end，绝不能写 event.button ~= MOUSEB_LEFT（会让左键 0 ~= nil 恒真而被静默吞掉）。
3. 丢弃落点别做屏幕反解。event.x/y 在有/无 CSS transform 的祖先链下语义不同，ScreenToWorld 反复踩坑。要丢脚底就直接 ActorSpatialService.GetPosition(player.id)；ScreenToWorld 只留给"拖到谁身上"的命中判断。