TileCacheDelay< Tile > Class Template Reference

#include <tile_cache_delay.h>

Inheritance diagram for TileCacheDelay< Tile >:

Public Member Functions
Tile const *	ready (TileId const &to_find) const
void	request (Area const &area)
Public Member Functions inherited from TileCache< Tile >
float	getTileServerErrorRate (std::string const &tile_server) const
	Calculate the error rate of a tile server. More...
void	purge (Area const &area)
Tile const *	ready (TileId const &to_find) const
void	request (Area const &area)
	TileCache ()

Private Attributes
detail::AreaHistory	history_

Additional Inherited Members
Protected Member Functions inherited from TileCache< Tile >
bool	isAreaReady (Area const &area) const

Detailed Description

template<typename Tile>
class TileCacheDelay< Tile >

TileCacheDelay is like TileCache but gets (mostly) rid of the effect that the tiles are drawn one-by-one by delaying the tiles. This class is just a cosmetic improvement - it doesn't intent to improve performance.

This is done by trying to load a whole square instead of just a single tile. The exact algorithm is as follows:

Every time the robot enters a new center tile, request() is called. This functions stores the requested detail::ExpiringArea, where a ExpiringArea is just an Area at a tile id with a timeout. Therefore we will collect a history of Areas (detail::AreaHistory) while the robot moves.

A tile will be drawn if it's ready(). A tile is ready() iff:

• it's successfully loaded from the file system or the internet, and
• either of the following things happened:
  • the tile is inside an Area which has all its tiles successfully loaded, or
  • the tile is inside an Area which expired, i.e. the Area was requested some seconds ago but not all tiles are loaded.

Warning

Since TileCache isn't a virtual class, you shouldn't upcast a TileCacheDelay object to a TileCache object!

Definition at line 24 of file tile_cache_delay.h.

Member Function Documentation

ready()

template<typename Tile>

Tile const* TileCacheDelay< Tile >::ready ( TileId const &  to_find ) const

inline

Note

You have to use TileCacheGuard to guard this function call and the returned tile.

Definition at line 166 of file tile_cache_delay.h.

request()

template<typename Tile>

void TileCacheDelay< Tile >::request ( Area const &  area )

inline

Definition at line 155 of file tile_cache_delay.h.

Member Data Documentation

history_

template<typename Tile>

detail::AreaHistory TileCacheDelay< Tile >::history_

private

Definition at line 151 of file tile_cache_delay.h.

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The documentation for this class was generated from the following file:

• tile_cache_delay.h