> how to check a pixel is either inside > or outside or on a polygon... > i need coding in c to apply this concept....
First you need to come up with a data structure to represent polygons. Then you need an algorithm to work out whether a point is inside or outside the polygon. Defining "inside" would be a good start. Then write some pseudo-code to apply the algorithm to the data structure, and check that it works properly with extreme cases. Finally, convert the pseudo-code into C. David
