gsl-shell.git - gsl-shell

diff --git a/agg-plot/utils.h b/agg-plot/utils.h
index d90febf6..a6a0a5df 100644
--- a/agg-plot/utils.h
+++ b/agg-plot/utils.h

@@ -48,6 +48,12 @@ private:

agg::pod_bvector<T*> m_list;

};

+inline bool is_unit_matrix(const agg::trans_affine& m, double eps = 1.0e-5)

+{

+ return (fabs(m.sx - 1.0) < eps && fabs(m.shx) < eps && \

+ fabs(m.shy) < eps && fabs(m.sy - 1.0) < eps);

+}

+

extern void trans_affine_compose (agg::trans_affine& a,

const agg::trans_affine& b);