| 4 | | 4 | |
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| 5 | | 5 | • they can coexist on the same tile in some cases, but do not influence each other
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| 6 | | 6 | • the term ‘roadtypes’ is confusing for historical reasons and due to pre-existing use in code, and is not used here: this is NotRoadTypes
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| 7 | | 7 | |
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| 8 | | 8 | • per tile, one subtype of ‘road’ and one subtype of ’tram’ may be present
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| 9 | | 9 | • construction tools for ‘road’ and ’tram' are independent
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| 10 | | 10 | • adding/removing/converting ‘road’ on a tile does not affect ‘tram’ for tile and vice-versa
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| 11 | | 11 | • vehicles are either ‘road’ or ‘tram’, they cannot be both
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| 12 | | 12 | • vehicle routing and movement per ‘road’ and ‘tram’ are independent
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| 13 | any ‘road’ subtype may be freely combined with any ’tram’ subtype, there are no ways to make ‘road’ and ’tram’ incompatible with each other by subtype or any other means
| 13 | • any ‘road’ subtype may be freely combined with any ’tram’ subtype, there are no ways to make ‘road’ and ’tram’ incompatible with each other by subtype or any other means
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| 14 | | 14 | • subtypes
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| 15 | | 15 | ◦ proposed up to 15 ‘road' subtypes and 15 ‘tram’ subtypes (implementation detail: uses 4 bits each, uses 8 bits free in m8)
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| 16 | | 16 | ◦ 15 is more than enough for any game
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| 17 | | 17 | ◦ spec shouldn’t have an opinion on how many type a game needs, but 3 or 4 of each is plenty imho
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| 18 | | 18 | ◦ each subtype has a label
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| 19 | | 19 | ◦ vehicle compatibility with a subtype is determined by label
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| 20 | | 20 | ◦ vehicle may determine some properties by subtype (power, possibly others)
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| 21 | | 21 | • drawing
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| 22 | | 22 | ◦ ‘tram’ is always drawn above ‘road’; authors need to be aware of this when drawing sprites, no mechanism will be provided to vary this
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| 23 | | 23 | ◦ drawing of city roads, bridges, tunnels, and similar will follow existing behaviour
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| 24 | | 24 | ◦ drawing of rail crossings may or may not be fixed (road tile is enforced for tram crossings currently, this looked non-trivial to fix when I tried)
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| 25 | | 25 | ◦ methods _may_ be provided to enable more control over appearance, e.g. snow above snowline etc
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| 26 | | 26 | • catenary
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| 27 | | 27 | ◦ subtypes can provide catenary, or not (implementation detail: flag or cb returning sprites)
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| 28 | | 28 | ◦ both ‘road’ and ‘tram’ can provide catenary on a tile
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| 29 | | 29 | ◦ authors will need to draw catenary carefully to avoid it looking bad when ‘road’ and ‘tram’ catenary are combined on a tile
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| 30 | | 30 | ◦ vehicle power on a tile is determined by vehicle against subtype label, unrelated to drawing of catenary sprites
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| 31 | | 31 | ◦ there is sophisticated handling of rail catenary to preserve continuity where railtypes cross, something similar needs to be provided for NotRoadTypes
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| 32 | | 32 | • converting between subtypes
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| 33 | | 33 | ◦ a convert tool is needed, similar to rail conversion
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| 34 | | 34 | ◦ this will need to consider ownership carefully
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| 35 | | 35 | ▪ too restrictive = can’t overbuild subtypes in towns
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| 36 | | 36 | ▪ too permissive = deliberate or accidental breaking of existing routes by overbuilding incompatible subtype
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| 37 | | 37 | • drive-in stops:
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| 38 | | 38 | ◦ behaviour of articulated vehicles and trams unchanged, can’t use drive-in stops
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| 39 | catenary needs to be provided for ‘road' drive-in stops
| 39 | ◦ catenary needs to be provided for ‘road' drive-in stops
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| 40 | | 40 | • overtaking: out of scope
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