The room editor is used to place your objects and create specific scenes and levels for your game.
Tiles are used to create the game's background. They are not linked to events or actions and are much more lightweight than instances. Tiles are structured in different layers. Layers with highest values will be displayed in latest and will be always visible. You are always working on a specific layer when you add or modify a tile. The active layer is displayed in the drop down menu 'Current Tile Layer'. It contains all layers in the current room. You can add a new layer with the 'Add' button, or delete a layer with its tiles with the 'Delete' button. The check-box 'Hide other layers' will hide all layers except the active one. The check-box 'Edit other layers' allows the user to work on all layers at the same time.
These buttons are used to manage the following options : the first one changes the 'Snap to grid' option. If this option is activated, all objects are placed according to the grid. When the second option 'Add on top' is activated, it will ensure that new objects are always added when you click the left button in the room, regardless if there is already an object under the mouse cursor. If the third option 'Add multiple' is activated, it will add continuously objects under the mouse cursor when the left mouse button is pressed. These options can be enable or disabled temporarily by pressing the following keys : Alt (disable 'Snap to grid'), Ctrl (enable 'Add on top') and Shift (enable 'Add multiple').
There are two selection modes in LateralGM : the single selection object mode, which is active by default, is used to select a single object. This mode can be selected by pressing the arrow button. The second mode, the region selection mode, is activated by pressing the rectangular selection button. In order to select a region, the user draws a rectangle in the room:
When a region has been selected, it can be filled with an instance or a tile. If the region has to be filled with an instance, the instance type has to be selected first in the objects tab:
Then the selection region can be filled by pressing the bucket button. If the 'Delete underlying' option has been selected, all instances which are already exist in the selection will be deleted before filling the region. If the 'Snap to grid' option is selected, the region will be filled according to the grid :
If the 'Snap to grid' mode is deactivated, the region is filled according to the instances or tiles size :
The principle is similar for tiles : the user has first to select a layer and a tile in the tiles tab, and then he can fill the selected region with the fill button.
In order to delete instances or tiles in the selected region, the user can press the 'Delete' key or press the 'Delete instances/tiles' button (The button with a red cross). If the objects tab is selected, instances will be deleted, and if the tiles tab is selected, only tiles will be deleted.
It is possible to customize the appearance of the selected region by modifying the options in preferences window. The options are stored in the 'Room editor' section in the 'Rectangular selection' panel. By default the selected region is a semi-transparent rectangle filled with a blue color :
Cutting, copying and pasting regions
The buttons 'Cut' (Ctrl-x), 'Copy' (Ctrl-c) and 'Paste' (Ctrl-v) are used to copy and move regions. If the user wants to copy a region, first he will select the objects tab for selecting instances and the tiles tab for selecting tiles. Then he will select the region with the 'Select a region' button and draw a rectangle :
Then the 'Copy' and 'Paste' buttons are clicked. If the the tiles tab is selected, only tiles of the current layer will be selected, except if the option 'Edit other layer' is checked. When the paste is done, a stamp is created with a semi-transparent image of the selection :
The user can move the stamp and click on the left mouse button, and it will copy the selected region on the given position :
If the 'Delete underlying' option is selected, it will delete first the instances or tiles in the region before filling it. If the user wants to exit the pasting mode, he can select 'Select an object' if he wants to select an single object or 'Select a region' to select again a region. If the user press the 'cut' button instead of the 'copy' button, the objects in the region will be deleted before copying the region.