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https://github.com/BenMakesGames/FoV
A collection of field-of-view/line-of-sight algorithms designed for tile-based games.
https://github.com/BenMakesGames/FoV
field-of-view fov fov-algorithms line-of-sight los los-algorithms tile-based tile-based-game
Last synced: about 2 months ago
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A collection of field-of-view/line-of-sight algorithms designed for tile-based games.
- Host: GitHub
- URL: https://github.com/BenMakesGames/FoV
- Owner: BenMakesGames
- License: mit
- Created: 2023-04-14T18:06:00.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-02-03T05:20:23.000Z (11 months ago)
- Last Synced: 2024-09-29T06:07:38.246Z (3 months ago)
- Topics: field-of-view, fov, fov-algorithms, line-of-sight, los, los-algorithms, tile-based, tile-based-game
- Language: C#
- Homepage:
- Size: 69.3 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
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README
# What Is It?
`BenMakesGames.FoV` is a collection of field-of-view algorithms designed for square tile grids. It features the following algorithms:
* Diamond-wall
* Milazzo's Beveled-wall
* Raycasting
* Shadowcasting
Field-of-view/line-of-sight is useful for roguelikes, and other tactical, tile-based games where vision plays an important role.
[](https://ko-fi.com/A0A12KQ16)
# How to Use
## Install
```powershell
dotnet add package BenMakesGames.FoV
```
## Create a Map
Your map must implement `IFoVMap`, which requires a `Width` and `Height` property, and a method that returns whether or not a given tile is opaque:
For example:
```c#
public sealed class MyMap: IFoVMap
{
public int Width { get; }
public int Height { get; }
// store your tiles however you want; here's one possibility:
public MyTile[] Tiles { get; }
// BlocksLight is required by IFoVMap; here's one possible implementation:
bool BlocksLight(int x, int y)
{
if(x < 0 || x >= Width || y < 0 || y >= Height)
return true;
return Tiles[x + y * Width].IsOpaque;
}
...
}
```
Another common implementation is to use a `Dictionary<(int X, int Y), MyTile>` collection to store the map.
## Call One of the FoV Algorithms
All of the algorithms have the same signature:
```c#
HashSet<(int X, int Y)> Compute(IFoVMap map, (int X, int Y) origin, int radius)
```
They take a map, origin point, and sight radius, and returns a set of points that are visible from the origin.
Basic usage:
```c#
var visibleTiles = DiamondWallsFoV.Compute(Map, (Player.X, Player.Y), Player.SightRadius);
for(int y = 0; y < Map.Height; y++)
{
for(int x = 0; x < Map.Width; x++)
{
if(visibleTiles.Contains((x, y)))
{
// tile is visible; draw it!
}
else
{
// don't draw the tile, or draw it as a fog of war tile
}
}
}
```
When implementing field-of-view in your game, you should only compute a new field of view when the player moves, or the map changes (such as a door opening or closing).
### Available Algorithms, and Their Features
* `DiamondWallsFoV`
* Relatively fast algorithm. Compared to other algorithms, reveals more tiles in a given sight radius.
* `MilazzoFoV`
* Medium speed; designed to have intuitive lines of sight, especially for maps which contain many single-tile walls/pillars.
* `RayCastFoV`
* Slowest algorithm, with occasionally unintuitive lines of sight. Not generally recommended; included for historical reasons.
* `ShadowCastFoV`
* The fastest algorithm of the bunch, especially when used in large, open spaces with large sight radii.