范围攻击：圆形扇形矩形各有判定

-- 错误：客户端喊打哪就打哪，服务端不复核
function onCast(p, targets)
    for _, t in ipairs(targets) do
        hurt(t, 500)
    end
end

local function inCircle(dx, dy, r)
    return dx * dx + dy * dy <= r * r
end
local function inRect(dx, dy, w, h)
    return math.abs(dx) <= w / 2
        and math.abs(dy) <= h / 2
end
local p = getplayerbyname("aoe01")
sendmsg(p, 1, tostring(inCircle(3, 4, 5))
    .. "/" .. tostring(inRect(6, 1, 10, 4)))