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# Track Environment

## Inputs

NameTypeRangeShort description
TrackSpeedsint[48][ -255 , 255 ]The speed per track. Track names can be used as indices. (e.g. KH_ST_0)
Pointsint[30]{BRANCH, STRAIGHT}The numbered values of the switchable intersection points. (e.g. 23)
TrackSignalsbool[40][2]{true, false}The signals on each track. If the track contains signals it's always two. Track names can be used as indices. (e.g. KH_ST_1)

## Outputs

NameTypeRangeShort description
TrainPositionsint[15][ 0 , 47 ]The position, that a given train currently occupies. (e.g. Train TRAIN_KH_ST_0 occupies KH_ST_0 on startup)
TrainSpeedsint[15][  -255 ,  255 ]The speed, that a given train currently occupies (e.g. Train TRAIN_KH_ST_0 has speed 100)
ForwardNextint[48][5][ 0, 48 ] (-1 means invalid)The next lines in the main direction. Each track can have at most 5 possible lines. -1 for all entries, that are not valid lines. (e.g. ForwardNext[KH_ST_1][0] == KH_ST_6, ForwardNext[KH_ST_1][1] == -1,...)
ReverseNextint[48][5][ 0, 48 ] (-1 means invalid)Same behaviour as ForwardNext, but in the secondary direction. If the secondary direction is not permitted all values are -1.
Errorstring
Error messages. (e.g. If a required track signal did not trigger)

## Requirements

For two directly connected Tracks the IDs of the Points that need to be passed (if any) including their direction (branch, straight).

Idea: A big matrix in the form of PointPositions[48][48][2][2]. So for each set of tracks the points (if any) and as value either branch or straight.

```PointPositions[KH_LN_5][KH_LN_7][0] = {14, BRANCH}
PointPositions[KH_LN_5][KH_LN_7][1] = {null, null}

PointPositions[KH_ST_4][KH_ST_0][0] = {1, BRANCH}
PointPositions[KH_ST_4][KH_ST_0][1] = {2, BRANCH}

PointPositions[KH_LN_5][KH_LN_6][0] = {null, null}

...```