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#1 Posted : Wednesday, June 24, 2015 5:40:49 AM(UTC)

Amin  
Amin

Groups: Manager, Tech Support
Posts: 353


Flood fill, also known as seed fill, bucket fill or boundary fill, is the process of setting the color of a pixel (the start pixel) and all pixels connected to it with a new color. Connected pixels are those adjacent to the start pixel and all the pixels adjacent to them, ad infinitum, provided they are sufficiently close to the start pixel in intensity or color value.
Any surrounding pixels that are not sufficiently close are considered the boundary and are not filled.

An easy way to implement flood fill using LEADTOOLS is to use the Magic Wand function to define a region, then use the Fill command to change the color. When a region is defined in the image, the Fill command will only act on the region. Here's sample code:

void FloodFill(RasterImage LeadImage, int x, int y, int tolerance, RasterColor newColor)
{
   RasterColor toleranceColor = new RasterColor(tolerance, tolerance, tolerance);
   LeadImage.AddMagicWandToRegion(x, y, toleranceColor, toleranceColor, RasterRegionCombineMode.Set);
   if (LeadImage.HasRegion)
   {
      Leadtools.ImageProcessing.FillCommand _fill = new Leadtools.ImageProcessing.FillCommand(newColor);
      _fill.Run(LeadImage);
      LeadImage.MakeRegionEmpty();
   }
}

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.
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