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core: Add dir_to_yaw and yaw_to_dir helpers

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These are needed to go from things like entity yaw to a vector
and vice versa.
This commit is contained in:
Auke Kok 2017-01-12 11:56:41 -08:00 committed by paramat
parent 2d7a6f2cc0
commit 7fc6719968
2 changed files with 12 additions and 0 deletions
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8
builtin/game/item.lua
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@ -147,6 +147,14 @@ function core.wallmounted_to_dir(wallmounted)
return wallmounted_to_dir[wallmounted]
end
function core.dir_to_yaw(dir)
return -math.atan2(dir.x, dir.z)
end
function core.yaw_to_dir(yaw)
return {x = -math.sin(yaw), y = 0, z = math.cos(yaw)}
end
function core.get_node_drops(nodename, toolname)
local drop = ItemStack({name=nodename}):get_definition().drop
if drop == nil then

4
doc/lua_api.txt
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@ -2403,6 +2403,10 @@ and `minetest.auth_reload` call the authetification handler.
* Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"`
* `minetest.wallmounted_to_dir(wallmounted)`
* Convert a wallmounted value back into a vector aimed directly out the "back" of a node
* `minetest.dir_to_yaw(dir)`
* Convert a vector into a yaw (angle)
* `minetest.yaw_to_dir(yaw)`
* Convert yaw (angle) to a vector
* `minetest.get_node_drops(nodename, toolname)`
* Returns list of item names.
* **Note**: This will be removed or modified in a future version.