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--
-- Helper functions
--
cart_func = {}
function cart_func:get_sign(z)
if z == 0 then
return 0
else
return z/math.abs(z)
end
end
-- Returns the velocity as a unit vector
-- The smaller part of the vector will be turned to 0
function cart_func:velocity_to_dir(v)
if math.abs(v.x) > math.abs(v.z) then
return {x=cart_func:get_sign(v.x), y=cart_func:get_sign(v.y), z=0}
else
return {x=0, y=cart_func:get_sign(v.y), z=cart_func:get_sign(v.z)}
end
end
function cart_func:is_rail(p)
local nn = minetest.env:get_node(p).name
return minetest.get_item_group(nn, "rail") ~= 0
end
function cart_func:is_int(z)
z = math.abs(z)
return math.abs(math.floor(z+0.5)-z) <= 0.1
end
cart_func.v3 = {}
function cart_func.v3:add(v1, v2)
return {x=v1.x+v2.x, y=v1.y+v2.y, z=v1.z+v2.z}
end
function cart_func.v3:copy(v)
return {x=v.x, y=v.y, z=v.z}
end
function cart_func.v3:round(v)
return {
x = math.floor(v.x+0.5),
y = math.floor(v.y+0.5),
z = math.floor(v.z+0.5),
}
end
function cart_func.v3:equal(v1, v2)
return v1.x == v2.x and v1.y == v2.y and v1.z == v2.z
end
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