# Function Calls

There are few calls relating to cel projection, because most of the programming work is done by creating and manipulating CCBs. See Graphics Folio Calls for a description of the calls.

### Cel Projection Calls

- `DrawCels()` Draws a list of cels (one or more) to the buffer of a bitmap.
- `DrawScreenCels()` Draws a list of cels (one or more) to the bitmaps of a screen.
- `SetReadAddress()` Sets a bitmap's read address.
- `ResetReadAddress()` Resets a bitmap's read address.

### CCB and Cel Engine Control Word Manipulation Calls

- `MakeCCBRelative()` Creates a CCB relative address.
- `MapCel()` Maps this cel onto any four corners.
- `SetCEControl()` Sets the cel engine control word.