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int RenderNode(const int Color, myint y1, myint y2, int &mostleft, const std::string &sDisplayText, bool bShove);
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void RecursiveRenderGroups(SGroupInfo *pCurrentGroup, CDasherNode *pNode, myint y1, myint y2, int mostleft);
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/// Get the bounding box of the visible region.
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void VisibleRegion( myint &iDasherMinX, myint &iDasherMinY, myint &iDasherMaxX, myint &iDasherMaxY );
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/// FIXME - couldn't find windows version of round(double) so here's one!