Mover is a simple game on the Xaya platform, where
players can move around in an infinite plane. It is fully functional, but
mainly meant to illustrate the use of libxayagame. The source code can
also be used as basis for implementing more complex games.
The Xaya game ID for mover is mv.
The game state of Mover holds a list of players that have entered the world.
Each of those players is at some integer coordinate on an infinite 2D plane.
Optionally, the player may be moving for n more turns into one of the
eight cardinal or diagonal directions.
Moves are represented by a JSON object that specifies how the player should be moved in the game world:
{
"d": DIRECTION,
"n": STEPS
}
Here, DIRECTION specifies the direction in which the player should
be moved. It can be one of the following (inspired by Vim movement keys
and Nethack):
| Value | Direction | Vector |
|---|---|---|
l |
right | (1, 0) |
h |
left | (-1, 0) |
k |
up | (0, 1) |
j |
down | (0, -1) |
u |
right and up | (1, 1) |
n |
right and down | (1, -1) |
y |
left and up | (-1, 1) |
b |
left and down | (-1, -1) |
STEPS is a positive integer that specifies for how many turns the player
should move into the specified direction.
The value may be at most 1,000,000.
For updating the game state with a new block, the following steps are performed:
- Players that sent a move in the block but are not yet on the map are added
at the initial position
(0, 0). - All players that sent a move have their direction and number of steps set to what was specified in the move.
- All players with a non-zero number of movement steps left are moved one step in their respective directions.
- The number of movement steps left for each player is decremented by one (until it is zero).
- For all players whose steps left is (now) zero, the movement direction is cleared.