sprite ordering

do you know how many columns you have (i.e. the highest possible x value)? if so, sort them by ((y * max_x_value) + x).

--- krez (krezisback@aol.com)

you might use y * w + x for your sort, and you''ll likely get better results, where w is the width of worldspace in pixels or whathaveyou.

also, if the x and y come from the upper left corner of the image, then it still won''t work for all cases, unless all of your sprites are of uniform size. you need to set an anchoring point for your sprites, and use that position instead. typically, the anchoring point will be near the middle of the bottom, where the "feet" are.

Now its working inversly(a sprite with a y*w+x value comes before a sprite with a higher y*w+x) Im using an stl list sort. The < operator looks like this.
bool DxObj::operator<(const DxObj &a) const
{
return ((Objinfo.AbsPixPos.y+Objinfo.SortPoint.y)*(Objinfo.Map->size()*Objinfo.Mapinfo->TileSize.x)+Objinfo.AbsPixPos.x+Objinfo.SortPoint.x)
< ((a.Objinfo.AbsPixPos.y+a.Objinfo.SortPoint.y)*(a.Objinfo.Map->size()*a.Objinfo.Mapinfo->TileSize.x)+a.Objinfo.AbsPixPos.x+a.Objinfo.SortPoint.x);
}
and everytime i add a sprite in or move a sprite i sort the list.

If i change the return value to use greater than instead of less than then it works fine.