Added density support

CHANGELOG

@@ -18,5 +18,6 @@ CHANGELOG
 - Added exception for PIL import
 
 * 2014-05-20 - Version 1.0.4
+- Issue #20: Added Density support (Sent by thomas.erbacher@ragapack.de)
 - Added charcode tables
 - Fixed Horizontal Tab

escpos/constants.py

@@ -73,3 +73,13 @@ S_RASTER_N      = '\x1d\x76\x30\x00' # Set raster image normal size
 S_RASTER_2W     = '\x1d\x76\x30\x01' # Set raster image double width
 S_RASTER_2H     = '\x1d\x76\x30\x02' # Set raster image double height
 S_RASTER_Q      = '\x1d\x76\x30\x03' # Set raster image quadruple
+# Printing Density
+PD_N50          = '\x1d\x7c\x00' # Printing Density -50%
+PD_N37          = '\x1d\x7c\x01' # Printing Density -37.5%
+PD_N25          = '\x1d\x7c\x02' # Printing Density -25%
+PD_N12          = '\x1d\x7c\x03' # Printing Density -12.5%
+PD_0            = '\x1d\x7c\x04' # Printing Density  0%
+PD_P50          = '\x1d\x7c\x08' # Printing Density +50%
+PD_P37          = '\x1d\x7c\x07' # Printing Density +37.5%
+PD_P25          = '\x1d\x7c\x06' # Printing Density +25%
+PD_P12          = '\x1d\x7c\x05' # Printing Density +12.5%

escpos/escpos.py

@@ -230,7 +230,7 @@ class Escpos:
             raise TextError()
 
 
-    def set(self, align='left', font='a', type='normal', width=1, height=1):
+    def set(self, align='left', font='a', type='normal', width=1, height=1, density=9):
         """ Set text properties """
         # Width
         if height == 2 and width == 2:
@@ -276,6 +276,27 @@ class Escpos:
             self._raw(TXT_ALIGN_RT)
         elif align.upper() == "LEFT":
             self._raw(TXT_ALIGN_LT)
+        # Density
+        if density == 0:
+            self._raw(PD_N50)
+        elif density == 1:
+            self._raw(PD_N37)
+        elif density == 2:
+            self._raw(PD_N25)
+        elif density == 3:
+            self._raw(PD_N12)
+        elif density == 4:
+            self._raw(PD_0)
+        elif density == 5:
+            self._raw(PD_P12)
+        elif density == 6:
+            self._raw(PD_P25)
+        elif density == 7:
+            self._raw(PD_P37)
+        elif density == 8:
+            self._raw(PD_P50)
+        else:# DEFAULT: DOES NOTHING
+            pass
 
 
     def cut(self, mode=''):