Add constants for Axis type to R and Python API

src/R/RTool.cpp

@@ -325,6 +325,10 @@ RTool::RTool()
                                 "GC.CHART.SCATTER<-2\n"
                                 "GC.CHART.BAR<-3\n"
                                 "GC.CHART.PIE<-4\n"
+                                "GC.AXIS.CONTINUOUS<-0\n"
+                                "GC.AXIS.DATE<-1\n"
+                                "GC.AXIS.TIME<-2\n"
+                                "GC.AXIS.CATEGORY<-3\n"
 
                                // version and build
                                "GC.version <- function() { return(\"%1\") }\n"

src/Resources/python/library.py

@@ -79,6 +79,12 @@ GC.CHART_SCATTER=2
 GC.CHART_BAR=3
 GC.CHART_PIE=4
 
+# Axis type
+GC.AXIS_CONTINUOUS=0
+GC.AXIS_DATE=1
+GC.AXIS_TIME=2
+GC.AXIS_CATEGORY=3
+
 GC.SERIES_SECS = 0
 GC.SERIES_CAD = 1
 GC.SERIES_CADD = 2