C-evo Map File Specification

Map file version 0

File Structure

Offset	Length	Content	Description
0x0000	8	Format ID	String "cEvoMap", ignored by program
0x0008	4	Format version	Must be 0 for this specification
0x000C	4	MaxTurn	Reserved for future use
0x0010	4	LX	Horizontal map size (number of tiles), min. 20, max. 100
0x0014	4	LY	Vertical map size (number of tiles), max. 96
0x0018	LX*LY*4	Tiles	List of DWords defining the single tiles

Tile Order

Due to this system, LX and LY have different scales. While LX counts double tile columns, LY only counts single tile rows.
LY must always be an even number.

Tile Definition

Each tile is defined by a DWord which is a combination of its terrain type, tile improvement and optional flags.
Flags are also used to define the nation starting positions. These definitions are essential, a map can not be played by more players than it has starting positions.

Terrain types (exclude each other):

0x00	Ocean		0x24	Prairie+Wheat
0x01	Coast		0x25	Tundra+Gold
0x02	Grassland		0x26	Arctic+Ivory
0x03	Desert		0x27	Swamp+Peat
0x04	Prairie		0x29	Forest+Game
0x05	Tundra		0x2A	Hills+Wine
0x06	Arctic		0x2B	Mountains+Iron
0x07	Swamp		0x41	Coast+Manganese
0x09	Forest		0x43	Desert+Oil
0x0A	Hills		0x44	Prairie+Bauxite
0x0B	Mountains		0x45	Tundra+Natural Gas
0x21	Coast+Fish		0x49	Forest+Mineral Water
0x22	Plains		0x4A	Hills+Coal
0x23	Desert+Oasis		0x4B	Mountains+Diamonds

Tile improvements (exclude each other):

0x00001000	Irrigation
0x00002000	Farmland
0x00003000	Mine
0x00004000	Fort
0x00005000	Military base

Tile flags:

0x00000080	River
0x00000100	Road
0x00000200	Railroad
0x00000400	Canal
0x00010000	Pollution
0x01000000	Dead Lands
0x03000000	Cobalt
0x05000000	Uranium
0x07000000	Mercury
0x00200000	Nation starting position, preferred for human players
0x00400000	Normal nation starting position

Restrictions

Some conditions which are not checked by the program but should be cared for:

• Several flag combinations are not allowed by the game rules, e.g. grassland with mine or a tile with both road and railroad. Such illegal constructions are likely to cause problems when playing the map.
• Ocean tiles should never be in the city radius of a potential city.
• Ocean and coast tiles can not have additional flags or improvements at all.
• Arctic tiles with rivers are not fully supported by the graphic engine.