BKchem
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# Chapter 2. Drawing

# 2.1. Introduction to the terms

Before we begin I should explain some terms that are used in the documentation and in the program itself.

Table 2-1. Used terms

Term | Definition
--- | ---
item | Any single undividable piece of the drawing - atom, bond, arrow point, plus. Not a molecule or arrow (see container).
container | Containers serve as a storage place for items (e.g. molecule stores atoms and bonds). Further I will use the term container also for texts and pluses even if they are also items (If it does not make sense to you don't just ignore it). As a synonym for container I will also use object or top-level object.
focus(ed) | Focused items are those that have a mouse pointer over them. The focus is usually visualized by some change of the item (e.g. circle drawn around atom, grey background of text etc.)
select(ed) | In contrast to focus, to select an item the user must take some action (usually click the mouse while the pointer is over an item (it is focused). The focus follows the mouse pointer, the selection is permanent until some action that unselects the item is performed. In contrast with focus it is possible to have more selected items.
mode | BKchem has several modes for different operations (e.g. for drawing molecules, drawing arrow, text, rotating existing objects). You select the mode by selecting one of the buttons on the top of the application window. You can find more on individual modes in the following chapters.

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