-void indent_mtx2(GRFMTX_2D m);
-void xlat_mtx2(GRFMTX_2D m, const double x, const double y);
-void scale_mtx2(GRFMTX_2D m, const double sx, const double sy);
-void rot_mtx2(GRFMTX_2D m, const double theta);
-void mult_mtx2(GRFMTX_2D m1, GRFMTX_2D m2, GRFMTX_2D result);
-void xform_mtx2(GRFMTX_2D m, double& x, double& y);
-void rotate2d(double x[], double y[], int pts, double angle);
-void xlat2d(double x[], double y[], int pts, double xoffset, double yoffset);
-void scale2d(double x[], double y[], int pts, double xfact, double yfact);
-
-// simpson.cpp
+void indent_mtx2 (GRFMTX_2D m);
+void xlat_mtx2 (GRFMTX_2D m, const double x, const double y);
+void scale_mtx2 (GRFMTX_2D m, const double sx, const double sy);
+void rot_mtx2 (GRFMTX_2D m, const double theta);
+void mult_mtx2 (const GRFMTX_2D m1, const GRFMTX_2D m2, GRFMTX_2D result);
+void xform_mtx2 (const GRFMTX_2D m, double& x, double& y);
+void rotate2d (double x[], double y[], int pts, double angle);
+void xlat2d (double x[], double y[], int pts, double xoffset, double yoffset);
+void scale2d (double x[], double y[], int pts, double xfact, double yfact);
+
+// mathfuncs.cpp
+double normalizeAngle (double theta);