Get unit conversion working for Gerber/Excellon files

Started operations module for file operations/transforms

1 files changed, 8 insertions, 0 deletions

diff --git a/gerber/utils.py b/gerber/utils.py
index 23575b3..542611d 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -26,6 +26,7 @@ files.
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 # License:
 
+MILLIMETERS_PER_INCH = 25.4
 
 def parse_gerber_value(value, format=(2, 5), zero_suppression='trailing'):
     """ Convert gerber/excellon formatted string to floating-point number
@@ -235,3 +236,10 @@ def validate_coordinates(position):
             for coord in position:
                 if not (isinstance(coord, int) or isinstance(coord, float)):
                     raise TypeError('Coordinates must be integers or floats')
+
+
+def metric(value):
+    return value * MILLIMETERS_PER_INCH
+
+def inch(value):
+    return value / MILLIMETERS_PER_INCH