patch for mypaint issue #154

mypaint_issue_154.patch

diff --git a/gui/freehand.py b/gui/freehand.py
index 7055f16..29efa72 100644
--- a/gui/freehand.py
+++ b/gui/freehand.py
@@ -429,6 +429,15 @@ class FreehandMode (gui.mode.BrushworkModeMixin,
         ytilt = event.get_axis(gdk.AXIS_YTILT)
         state = event.state
 
+        # Ugly hack for devices which have no description for axes.
+        # If the reported pressure is None but device has more than 2 axes
+        # set third (#2) axis as pressure
+        # Detail: https://github.com/mypaint/mypaint/issues/154
+        if pressure is None and event.device.get_n_axes() > 2 \
+                and event.device.get_axis_use(2) == gdk.AXIS_IGNORE:
+            event.device.set_axis_use(2, gdk.AXIS_PRESSURE)
+            pressure = event.get_axis(gdk.AXIS_PRESSURE)
+
         # Workaround for buggy evdev behaviour.
         # Events sometimes get a zero raw pressure reading when the
         # pressure reading has not changed. This results in broken