Terrain & Auto-tiling

Floor Tiles

The floor is stored in Cellule.floorChannel and Cellule.floorIcon. The floor channel is always CHFLOOR (1) or CHGROUND (11). The sprite file depends on the active region:

Key Floor Icon Ranges (floor000.blp)

Auto-tiling (arrange.cpp)

Auto-tiling automatically selects the correct floor tile based on neighbouring cells to make terrain transitions look natural.

tableSee — water transitions

// Encodes which quadrants (0-1 / 2-3) of a cell contain water
// 14 patterns × 4 quadrants
static char tableSee[14*4] = {
    0,0,0,0,  // 1 - no water
    0,1,0,1,  // 2
    0,0,1,1,  // 3
    1,0,1,0,  // 4
    1,1,0,0,  // 5
    0,0,0,1,  // 6
    0,0,1,0,  // 7
    1,0,0,0,  // 8
    0,1,0,0,  // 9
    0,1,1,1,  // 10
    1,0,1,1,  // 11
    1,1,1,0,  // 12
    1,1,0,1,  // 13
    1,1,1,1,  // 14 - fully water cell
};

tableDark — moss / dark soil transitions

// 13 patterns × 4 quadrants (icons 20–32)
static char tableDark[13*4] = { ... };

ArrangeFloor(cel)

Main floor auto-tiling function: 1. Examines 8 neighbouring cells 2. Determines terrain types of neighbours (water, grass, moss, ...) 3. Selects the appropriate tile from tableSee / tableDark 4. Applies the icon to the cell

ArrangeMur(cel, icon, index)

Wall auto-tiling — sets the correct wall icon (corners, straight segments) based on neighbouring wall cells.

ArrangeBuild(cel, channel, icon)

Building auto-tiling — sets the correct building icon depending on whether a neighbouring cell is also part of the same building.

ArrangeObject(cel)

Adjusts objects on the cell and its surroundings after placing a new object.

ArrangeBlupi()

Adjusts cell appearance for Blupi's current state (e.g. if Blupi stands on water in a boat, the cell below gets a water texture).

Flood-fill (ArrangeFill)

ArrangeFill() performs a flood-fill with a chosen terrain type:

void CDecor::ArrangeFill(POINT pos, int channel, int icon, BOOL bFloor)
// Starts from cell pos
// Spreads to all neighbouring cells of the same type
// Replaces them with the given channel/icon
// Used in the editor for quick area filling

Helper functions: - ArrangeFillTestFloor(cel1, cel2) — verify flood-fill eligibility - ArrangeFillTest(pos) — test a single cell for flood-fill - ArrangeFillPut(pos, channel, icon) — place a tile during flood-fill - ArrangeFillSearch(pos) — search neighbouring cells

Floor Passability Table (obstacle.cpp)

// tableObstacleFloor[] — passability of each floor icon index
// 0 = passable, 1 = obstacle
// Indexed by floor icon (0..N)
// Each icon has 5×5 = 25 passability bits (for different character types)
static char tableObstacleFloor[] = {
    1,1,1,1,1,  // icon 0 (black border) — all blocked
    1,1,1,1,1,
    ...
    0,0,0,0,0,  // icon 1 (land) — all passable
    ...
};