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Asked: 2026-05-18T04:05:07+00:00

I need a flood fill algorithm to fill existing raster shapes with various colors

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I need a flood fill algorithm to fill existing raster shapes with various colors and fill patterns. From what I know, the QuickFill algorithm is the best way to do a flood fill. I’ve found a number of implementations, but they are all in C++ and use Windows SDK functions. The problem is that I need a .NET implementation.

If worse comes to worse I can write a new implementation, but I would rather use an existing implementation (that hopefully doesn’t have bugs). Is anyone aware of an existing flood fill implementation in C#/VB.NET?

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  1. Editorial Team

    I like a lot to work with the Aforge Library that has two good FlodFill implementations, but both are 4 directional only.

    If you need other implementations there exist two code project articles Flood Fill Algorithms in C# and GDI+ and Queue-Linear Flood Fill: A Fast Flood Fill Algorithm.

    And if you like to dig in the code and learn, there is the Paint .Net project that has an excelent flood fill implementation.

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