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Arek the Absolute

Writing a Fill tool

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Anyone know a clean way to write a fill tool, or at least know a tutorial that might suggest how? I only need a real simple one, zero fill tolerance, etc... But frankly I''m clueless how to write one that wouldn''t be a total mess. Maybe that''s how they always are, but I figured I''d check. Thanks! Arek the Absolute

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Assuming you mean graphics filling...

simplest way would be to use already written GDI functions to do it. e.g. ExtFloodFill(), GradientFill(), FillPath() etc.

Algorithmically, doing it yourself, the simplest algorithm I can think of is the old Amiga hardware style one (off the top of my head...):


for (y=0; y<height; ++y)
{
bool fill = false;
for (x=0; x<width; ++x)
{
if (image[x][y] == outlineColour)
{
fill = !fill;
}

if (fill)
{
image[x][y] = fillColour;
}
}
}


--
Simon O'Connor
Creative Asylum Ltd
www.creative-asylum.com

Edited by - S1CA on February 20, 2002 2:13:23 PM

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if you want a border fill, or something like that, then the easiest thing to do is recusion.

off the top of my head,
  
int fill(int atx, int aty, int fillColor, int borderColor)
{
if ( color[x][y] != borderColor)
color[x][y] = fillColor;
else
for(int x = atx - 1; x < atx+ 1; x++)
for (int y = aty - 1; y < aty + 1; y++)
if (x != atx && y != aty && color[x][y] != fillColor)
fill(x,y,fillcolor,bordercolor);
}

ofcouse this is not optimised, and will overflow the stack on big areas, so you need to modify it a bit.

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