【入门夯实】火龙喷火轨迹：周期触发的步进写法

local step = 0
local function ontimerex31()
    step = step + 1
    local px = 40 + step
    genmon(4, px, 60, "火焰地带", 1, 1, 0)
end

local STEPS = 40
local CX, CY, RADIUS = 40, 60, 10
local function ontimerex31()
    local step = (tonumber(getsysvar("FireStep")) or 0) + 1
    setsysvarex("FireStep", step, 1)
    local angle = step * 9
    local px = CX + math.floor(RADIUS * math.cos(math.rad(angle)))
    local py = CY + math.floor(RADIUS * math.sin(math.rad(angle)))
    genmon(4, px, py, "火焰地带", 1, 1, 0)
end

local function startFire()
    setontimerex(31, 800)
end

local angle = -step * 9