104 lines
1.7 KiB
Lua
104 lines
1.7 KiB
Lua
function boost_cart: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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function boost_cart:velocity_to_dir(v)
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if math.abs(v.x) > math.abs(v.z) then
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return {x=boost_cart:get_sign(v.x), y=boost_cart:get_sign(v.y), z=0}
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else
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return {x=0, y=boost_cart:get_sign(v.y), z=boost_cart:get_sign(v.z)}
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end
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end
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function boost_cart:is_rail(pos)
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local node = minetest.get_node(pos).name
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return minetest.get_item_group(node, "rail") ~= 0
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end
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function boost_cart:get_rail_direction(pos_, dir_)
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local pos = vector.round(pos_)
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local dir = vector.new(dir_)
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local cur = nil
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-- Front
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dir.y = 0
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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-- Down
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dir.y = -1
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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-- Up
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dir.y = 1
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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-- Left, right
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dir.y = 0
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-- Check left and right
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local view, opposite, val
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if dir.x == 0 and dir.z ~= 0 then
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view = "z"
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other = "x"
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if dir.z < 0 then
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val = {1, -1}
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else
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val = {-1, 1}
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end
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elseif dir.z == 0 and dir.x ~= 0 then
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view = "x"
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other = "z"
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if dir.x > 0 then
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val = {1, -1}
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else
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val = {-1, 1}
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end
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else
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return {x=0, y=0, z=0}
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end
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dir[view] = 0
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dir[other] = val[1]
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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-- Down
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dir.y = -1
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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dir.y = 0
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dir[other] = val[2]
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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-- Down
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dir.y = -1
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cur = vector.add(pos, dir)
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if boost_cart:is_rail(cur) then
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return dir
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end
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return {x=0, y=0, z=0}
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end
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