【入门夯实】三角函数坐标旋转：方向计算的基础应用

local dirs = { {1,0}, {0,1}, {-1,0}, {0,-1} }
local d = dirs[math.random(4)]

local function circlePos(cx, cy, radius, deg)
    local rad = math.rad(deg)
    local x = cx + radius * math.cos(rad)
    local y = cy + radius * math.sin(rad)
    return math.floor(x), math.floor(y)
end
local function fireStep(step)
    local deg = step * 30
    local px, py = circlePos(50, 50, 10, deg)
    genmon(5, px, py, "火焰地带", 1, 1, 0)
end

local px, py = circlePos(50, 50, 10, 45)

local function aimAt(sx, sy, tx, ty)
    return math.deg(math.atan2(ty - sy, tx - sx))
end