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@ -5,7 +5,7 @@ This document describes Display Lib API. Display Lib allows to add a dynamic dis
### update\_entities
**display\_lib.update\_entities(pos)**
This method triggers entities update for the display node at pos. Actual entity update is made by `on\_display\_update` callback associated to the entity.
This method triggers entities update for the display node at pos. Actual entity update is made by `on_display_update` callback associated to the entity.
`pos`: Position of the node
### register\_display\_entity
@ -13,36 +13,36 @@ This method triggers entities update for the display node at pos. Actual entity
This is a helper to register entities used for display.
**entity_name**: Name of the entity to register.
`entity_name`: Name of the entity to register.
## Provided callback implementations
### on_place
**display\_lib.on\_place(itemstack, placer, pointed\_thing)**
`On_place` node callback implementation. Display nodes should have this callback (avoid placement of horizontal display node).
`on_place` node callback implementation. Display nodes should have this callback (avoid placement of horizontal display node).
### on_construct
**display\_lib.on\_construct(pos)**
`On_construct` node callback implementation. Display nodes should have this callback (creates, places and updates display entities on node construction).
`on_construct` node callback implementation. Display nodes should have this callback (creates, places and updates display entities on node construction).
### on_destruct
**display\_lib.on_destruct(pos)**
`On_destruct` node callback implementation. Display nodes should have this callback (removes display entities on node destruction).
`on_destruct` node callback implementation. Display nodes should have this callback (removes display entities on node destruction).
### on_rotate
**display\_lib.on\_rotate(pos, node, user, mode, new_param2)**
`On_rotate` node callback implementation. Display nodes should have this callback (restricts rotations and rotates display entities associated with node).
`on_rotate` node callback implementation. Display nodes should have this callback (restricts rotations and rotates display entities associated with node).
### on_activate
**display\_lib.on_activate(entity, staticdata)**
`On_activate` entity callback implementation for display entities. No need of this method if display entities have been registered using `register\_display\_entity` (callback is already set).
`On_activate` entity callback implementation for display entities. No need of this method if display entities have been registered using `register_display_entity` (callback is already set).
## Howto register a display node
* Register display entities with `register\_display\_entity`
* Register display entities with `register_display_entity`
* Register node with :
 - `on\_place`, `on\_construc`, `on\_destruc` and `on\_rotat` callbacks using display\_lib callbacks.
 - `on_place`, `on_construct`, `on_destruct` and `on_rotate` callbacks using display_lib callbacks.
 - `display_lib_node` group. This will make this node have their entities updated as soon as the mapblock is loaded (Useful after /clearobjects).
 - a `display\_entities` field in node definition containing a entity name indexed table. See below for description of each display\_entities fields.
 - a `display_entities` field in node definition containing a entity name indexed table. See below for description of each display_entities fields.
### Display_entities fields
`on_display_update` is a callback in charge of setting up entity texture. If not set, entity will have no texture and will be displayed as unknown item.