Draw staff

1 files changed, 19 insertions, 0 deletions

diff --git a/canvas.py b/canvas.py
index 763465f..d86d2c5 100644
--- a/canvas.py
+++ b/canvas.py
@@ -22,6 +22,25 @@ import gtk
 
 
 class StaffCanvas(gtk.DrawingArea):
+    width = None
+
     def __init__(self):
         gtk.DrawingArea.__init__(self)
         self.modify_bg(gtk.STATE_NORMAL, gtk.gdk.color_parse('#FFF'))
+        self.connect('expose-event', self._expose_event_cb)
+
+    def _expose_event_cb(self, widget, event):
+        window = widget.get_window()
+        context = window.cairo_create()
+        self.width = event.area[2]
+        height = event.area[3]
+        self.draw_staff(context, 50, self.width * 0.1, self.width * 0.05,
+                            height * 0.025)
+
+    def draw_staff(self, context, y, lmarg, rmarg, spacing):
+        line_y = y
+        for i in range(5):
+            context.move_to(lmarg, line_y)
+            context.line_to(self.width - rmarg, line_y)
+            line_y += spacing
+        context.stroke()