UX: Increase size of vertex controls around shape (#863)

* Increase shape vertex control size

* Increase canvas epsilon

libs/canvas.py

@@ -31,7 +31,7 @@ class Canvas(QWidget):
 
     CREATE, EDIT = list(range(2))
 
-    epsilon = 11.0
+    epsilon = 24.0
 
     def __init__(self, *args, **kwargs):
         super(Canvas, self).__init__(*args, **kwargs)

libs/shape.py

@@ -34,7 +34,7 @@ class Shape(object):
     vertex_fill_color = DEFAULT_VERTEX_FILL_COLOR
     h_vertex_fill_color = DEFAULT_HVERTEX_FILL_COLOR
     point_type = P_ROUND
-    point_size = 8
+    point_size = 16
     scale = 1.0
     label_font_size = 8