Difference between revisions of "Colour map"
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* the width and height of a map must be divisible by 8; | * the width and height of a map must be divisible by 8; | ||
| − | * a cavern map may now be up to 32760 pixels wide and 32600 pixels tall; | + | * a cavern map may now be up to 32760 pixels wide and 32600 pixels tall; (but this width causes bugs; the final maximum will be a bit less) |
* an island is limited to being 28664 pixels wide and 30552 pixels tall; | * an island is limited to being 28664 pixels wide and 30552 pixels tall; | ||
* the minimum map size is 640×32 pixels. | * the minimum map size is 640×32 pixels. | ||
Revision as of 19:35, 10 February 2007
Support for PNG colour maps were added to Worms Armageddon with the v3.6.19.7 Beta Update (released on 9 February 2004). W:A maps need to be in a paletted 256-colour mode. The number of colours that may appear in the map is restricted as well. W:A stores the extra map settings (water level, borders, etc.) in an extra PNG chunk.
The black colour, which must be present in the colour palette, is considered as transparent (zones/pixels painted black will appear as free space in the game).
Map size
Versions of W:A before 3.6.27.x only allowed maps that are exactly 1920×696 pixels in size. Version 3.6.27.x (currently in development) introduces support for arbitrarily-sized maps, with the following restrictions:
- the width and height of a map must be divisible by 8;
- a cavern map may now be up to 32760 pixels wide and 32600 pixels tall; (but this width causes bugs; the final maximum will be a bit less)
- an island is limited to being 28664 pixels wide and 30552 pixels tall;
- the minimum map size is 640×32 pixels.
Colour limitation
Since W:A uses a paletted display, the number of colours that may appear simultaneously on-screen is limited. The majority of the colour space is used for in-game graphics for the Worms, weapons, objects, water, UI elements, etc. Therefore, the colour maps may only use a limited number of colours in the palette (not counting black, which is treated as transparent), without affecting other Worms graphics:
- 64 colours and less - the map will be displayed perfectly, with no glitches
- 65-96 colours - the map background sprites (falling debris, clouds, etc.) are removed; the destroyed-soil background may be glitchy
- 97-112 colours - the entire background becomes solid black; destroyed soil is also solid black; the destroyed-soil border is solid gray
- 113 colours and more - the map will not load.
PNG chunk
W:A stores the extra settings in an extra PNG chunk, labeled w2lv or waLV. The chunk, excluding the label header, is 40 bytes long, and contains the same data as the header for monochrome maps. Extensions to the header format add extra bytes at the end; so far, there is one optional extra byte which controls the number of worm/object placement holes (the default is 18).
TweakPNG allows manipulation of PNG images on the chunk level, thus allowing chunk import/export, etc.
