89 lines
2.2 KiB
Lua
89 lines
2.2 KiB
Lua
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--
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-- Helper functions
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--
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cart_func = {}
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function cart_func:get_sign(z)
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if z == 0 then
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return 0
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else
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return z/math.abs(z)
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end
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end
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-- Returns the velocity as a unit vector
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-- The smaller part of the vector will be turned to 0
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function cart_func:velocity_to_dir(v)
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if math.abs(v.x) > math.abs(v.z) then
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return {x=cart_func:get_sign(v.x), y=cart_func:get_sign(v.y), z=0}
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else
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return {x=0, y=cart_func:get_sign(v.y), z=cart_func:get_sign(v.z)}
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end
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end
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function cart_func:is_rail(p)
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local nn = minetest.env:get_node(p).name
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--print("*!* is_rail p x=",p.x," y=",p.y," z=",p.z," nn=",nn," group rail=", minetest.get_item_group(nn, "rail"))
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--if nn == "ignore" then
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-- nn=cart_func:get_content_voxel(p)
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-- print("*!* is_rail hit ignore, trying again with get_content: now nn=",nn," group rail=", minetest.get_item_group(nn, "rail"),"p x=",p.x," y=",p.y," z=",p.z)
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--end
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return minetest.get_item_group(nn, "rail") ~= 0
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end
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function cart_func:check_rail_in_direction(pos, dir)
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local p = cart_func.v3:add(pos, dir)
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if cart_func:is_rail(p) then
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return true
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else
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return false
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end
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end -- cart:check_rail_in_direction
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function cart_func:is_int(z)
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z = math.abs(z)
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return math.abs(math.floor(z+0.5)-z) <= 0.1
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end
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cart_func.v3 = {}
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function cart_func.v3:add(v1, v2)
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return {x=v1.x+v2.x, y=v1.y+v2.y, z=v1.z+v2.z}
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end
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function cart_func.v3:copy(v)
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return {x=v.x, y=v.y, z=v.z}
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end
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function cart_func.v3:round(v)
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return {
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x = math.floor(v.x+0.5),
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y = math.floor(v.y+0.5),
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z = math.floor(v.z+0.5),
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}
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end
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function cart_func.v3:equal(v1, v2)
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return v1.x == v2.x and v1.y == v2.y and v1.z == v2.z
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end
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function cart_func:get_content_voxel(pos)
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local t1 = os.clock()
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local vm = minetest.get_voxel_manip()
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local pos1, pos2 = vm:read_from_map(vector.add(pos, {x=-1,y=-1,z=-1}),vector.add(pos, {x=1,y=1,z=1}))
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local a = VoxelArea:new{
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MinEdge=pos1,
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MaxEdge=pos2,
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}
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local data = vm:get_data()
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local vi = a:indexp(pos)
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local railid = data[vi]
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local real_name = minetest.get_name_from_content_id(railid)
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print(string.format("voxel-ing rail: elapsed time: %.2fms", (os.clock() - t1) * 1000))
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return real_name
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end |