overlay handles: the word for "rayon" is "radius"....

src/utilities/utilities_overlay.py

@@ -12,6 +12,7 @@ def utilities_show_overlay_on_context(ccontext, cpath, thickness=1):
 	if cpath is None:
 		raise NoSelectionPathException()
 	ccontext.new_path()
+	ccontext.set_antialias(cairo.Antialias.NONE)
 	ccontext.set_line_width(thickness)
 	ccontext.set_dash([thickness * 3, thickness * 3])
 	ccontext.append_path(cpath)
@@ -27,24 +28,24 @@ def utilities_show_handles_on_context(cairo_context, x1, x2, y1, y2, thickness=1
 	"""Request the drawing of handles for a rectangle pixbuf having the provided
 	coords. Handles are only decorative objects drawn on the surface to help the
 	user understand the rationale of tools without relying on the mouse cursor."""
-	rayon = min([(x2 - x1)/5, (y2 - y1)/5, 12 * thickness])
-	lateral_handles = True # may be a parameter later
-	if rayon < 4 * thickness:
+	radius = _get_radius((x2 - x1), (y2 - y1), thickness)
+	lateral_handles = True # may become a parameter later
+	if radius < 4 * thickness:
 		cairo_context.set_line_width(thickness)
-	elif rayon < 8 * thickness:
+	elif radius < 8 * thickness:
 		cairo_context.set_line_width(2 * thickness)
 	else:
 		cairo_context.set_line_width(3 * thickness)
 
-	_draw_arc_handle(cairo_context, x1, y1, rayon, 'nw')
-	_draw_arc_handle(cairo_context, x2, y1, rayon, 'ne')
-	_draw_arc_handle(cairo_context, x2, y2, rayon, 'se')
-	_draw_arc_handle(cairo_context, x1, y2, rayon, 'sw')
+	_draw_arc_handle(cairo_context, x1, y1, radius, 'nw')
+	_draw_arc_handle(cairo_context, x2, y1, radius, 'ne')
+	_draw_arc_handle(cairo_context, x2, y2, radius, 'se')
+	_draw_arc_handle(cairo_context, x1, y2, radius, 'sw')
 	if lateral_handles:
-		_draw_arc_handle(cairo_context, (x1+x2)/2, y1, rayon, 'n')
-		_draw_arc_handle(cairo_context, x2, (y1+y2)/2, rayon, 'e')
-		_draw_arc_handle(cairo_context, (x1+x2)/2, y2, rayon, 's')
-		_draw_arc_handle(cairo_context, x1, (y1+y2)/2, rayon, 'w')
+		_draw_arc_handle(cairo_context, (x1+x2)/2, y1, radius, 'n')
+		_draw_arc_handle(cairo_context, x2, (y1+y2)/2, radius, 'e')
+		_draw_arc_handle(cairo_context, (x1+x2)/2, y2, radius, 's')
+		_draw_arc_handle(cairo_context, x1, (y1+y2)/2, radius, 'w')
 
 	cairo_context.move_to(x1, y1)
 	cairo_context.line_to(x1, y2)
@@ -57,7 +58,7 @@ def utilities_show_handles_on_context(cairo_context, x1, x2, y1, y2, thickness=1
 	cairo_context.set_source_rgba(0.5, 0.5, 0.5, 0.5)
 	cairo_context.stroke()
 
-def _draw_arc_handle(cairo_context, x, y, rayon, orientation):
+def _draw_arc_handle(cairo_context, x, y, radius, orientation):
 	"""Draw a moon-like shape with the given orientation and radius. The coords
 	are the center of the shape. The orientation is an enumeration provided as a
 	string with the stupid n/nw/w/sw/s/se/e/ne format."""
@@ -87,13 +88,16 @@ def _draw_arc_handle(cairo_context, x, y, rayon, orientation):
 		angle_2 = -0.5 * math.pi
 
 	cairo_context.move_to(x, y)
-	cairo_context.arc(x, y, rayon, angle_1, angle_2)
+	cairo_context.arc(x, y, radius, angle_1, angle_2)
 	cairo_context.close_path()
 	cairo_context.set_source_rgba(1.0, 1.0, 1.0, 1.0)
 	cairo_context.fill_preserve()
 	cairo_context.set_source_rgba(0.5, 0.5, 0.5, 0.5)
 	cairo_context.stroke()
 
+def _get_radius(dx, dy, thickness):
+	return min([dx/5, dy/5, 12 * thickness])
+
 ################################################################################
 # Canvas generic ouline ########################################################