【界面UI】小地图路径：已走轨迹的虚线绘制

-- 小地图路径：轨迹采集
local panel = GUI:GetParent("MiniMap")
local trail = {}
local lastX, lastY = 0, 0
local function onMove(player, x, y)
    if math.abs(x - lastX) + math.abs(y - lastY) < 0.5 then return end
    lastX, lastY = x, y
    trail[#trail + 1] = {x = x, y = y}
    if #trail > 500 then table.remove(trail, 1) end
    drawTrail()
end
local function drawTrail()
    for i = 2, #trail do
        GUI:Line_Create(panel, "TrailLine" .. i,
            trail[i - 1].x, trail[i - 1].y,
            trail[i].x, trail[i].y, "dash")
    end
end

-- 路径管理：清空与标注
local player = class(actor)
local function clearTrail(player)
    for i = 2, #trail do
        local lineName = "TrailLine" .. i
        local widget = GUI:FindChild(panel, lineName)
        if widget then widget:SetVisible(false) end
    end
    trail = {}
    sendmsg(player, 1, 0, "轨迹已清空。")
end