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  Flood fill algorithm to select a country in a map with libgdx  (Read 980 times)
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Offline Gornova
« Posted 2018-03-03 14:05:37 »

See for working example and code here

Note: this solution is made for libgdx, using Pixmap

Building a 2d strategy game could be useful to draw a world map, divide countries using a specific color and then let user select a country, then highlight it. But how to made this selection without store any information about countries geometry ?

Solution: use flood fill algorithm!

<a href="http://www.youtube.com/v/zeer0N1cj_Y?version=3&amp;hl=en_US&amp;start=" target="_blank">http://www.youtube.com/v/zeer0N1cj_Y?version=3&amp;hl=en_US&amp;start=</a>

Solution is made with on the following steps:


1. get player click point as (x,y)
2. from (x,y) use flood fill algorithm to fill a specific area, delimited by border color
3. draw a border around the resulting image, not used areas are transparent
4. display image with border to the player

For the complete code, take a look here


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