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function is_filetype(filename, types)
types = types or {}
for _, type in ipairs(types) do
if filename:match("%."..type.."$") then
return true
end
end
return false
end
function randf_range(max, min)
return math.random() * (max - min) + min
end
function lerp(a, b, c)
return a + (b - a) * c
end
function dlerp(a, b, c)
return lerp(b, a, 0.5^c)
end
function bton(bool)
return bool and 1 or 0
end
function try(fn, ...)
if fn then
fn(...)
end
end
function min(a, b)
if a < b then
return a
end
return b
end
function normalize(x, y)
if x == 0 and y == 0 then
return 0, 0
end
local leng = math.sqrt(x*x + y*y)
return x / leng, y / leng
end
-- Top left corner
function point_in_rect(px, py, rx, ry, rw, rh)
return px > rx and px < rx + rw and py > ry and py < ry + rh
end
function dist(x1, y1, x2, y2)
local dx = x1 - x2
local dy = y1 - y2
return (dx*dx + dy*dy)^0.5
end
function sign(x)
if x == 0 then
return 0
end
return x < 0 and -1 or 1
end
function round(x)
return math.floor(x + 0.5)
end
function clamp(a, min, max)
return math.min(max, math.max(a, min))
end
function snap(x, step)
return round(x / step) * step
end
function frac(x)
return x - math.floor(x)
end
local function angle_diff(a, b)
local diff = (b - a) % (math.pi * 2)
return (2 * diff) % (math.pi * 2) - diff
end
function lerp_angle(a, b, t)
return a + angle_diff(a, b) * (1 - 0.5^t)
end
function dot(x, y, xx, yy)
return x*xx + y*yy
end
function vec_sqlen(x, y)
return x*x + y*y
end
function vec_len(x, y)
return math.sqrt(x*x + y*y)
end
function rotate_vec(x, y, r)
local angle = math.atan2(y, x) + r
local len = mathx.vec_len(x, y)
return math.cos(angle) * len, math.sin(angle) * len
end
function table.shallow_copy(t)
local t2 = {}
for k,v in pairs(t) do
t2[k] = v
end
return t2
end
function table.deep_copy(datatable)
local tblRes={}
if type(datatable)=="table" then
for k,v in pairs(datatable) do
tblRes[table.deep_copy(k)] = table.deep_copy(v)
end
else
tblRes=datatable
end
return tblRes
end
function trunc_filename_to_res(filename)
local index = filename:find("res/", 1, true)
return filename:sub(index)
end
EASING_FUNCTIONS = {
Lerp = lerp
}
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