gcode support for offset arcs

geometry.h

@@ -0,0 +1,30 @@
+/*
+  geometry.h - a place for geometry helpers
+  Part of Grbl
+
+  Copyright (c) 2009 Simen Svale Skogsrud
+
+  Grbl is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Grbl is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef geometry_h
+#define geometry_h 
+
+// Find the angle from the positive y axis to the given point with respect to origo.
+double theta(double x, double y);
+
+// Find the distance from origo to point [x,y]
+double hypot(double x, double y);
+
+#endif