[gimp] app: move adding an arc path out to a utility function

[Michael Natterer <mitch src gnome org>]

commit 74fe162f934ce1a23184e7f6bdae705e7ccb6701
Author: Michael Natterer <mitch gimp org>
Date:   Fri Sep 24 13:12:34 2010 +0200

    app: move adding an arc path out to a utility function

 app/display/gimpcanvashandle.c |   32 ++++++++------------------------
 app/widgets/gimpcairo.c        |   24 ++++++++++++++++++++++++
 app/widgets/gimpcairo.h        |    6 ++++++
 3 files changed, 38 insertions(+), 24 deletions(-)
---
diff --git a/app/display/gimpcanvashandle.c b/app/display/gimpcanvashandle.c
index 534a91a..e77034d 100644
--- a/app/display/gimpcanvashandle.c
+++ b/app/display/gimpcanvashandle.c
@@ -28,6 +28,8 @@
 
 #include "display-types.h"
 
+#include "widgets/gimpcairo.h"
+
 #include "gimpcanvashandle.h"
 #include "gimpdisplayshell.h"
 #include "gimpdisplayshell-transform.h"
@@ -430,18 +432,9 @@ gimp_canvas_handle_draw (GimpCanvasItem   *item,
       break;
 
     case GIMP_HANDLE_CIRCLE:
-      if (private->slice_angle >= 0)
-        {
-          cairo_arc_negative (cr, x, y, private->width / 2,
-                              - private->start_angle,
-                              - private->start_angle - private->slice_angle);
-        }
-      else
-        {
-          cairo_arc (cr, x, y, private->width / 2,
-                     - private->start_angle,
-                     - private->start_angle - private->slice_angle);
-        }
+      gimp_cairo_add_arc (cr, x, y, private->width / 2,
+                          private->start_angle,
+                          private->slice_angle);
 
       _gimp_canvas_item_stroke (item, shell, cr);
       break;
@@ -449,18 +442,9 @@ gimp_canvas_handle_draw (GimpCanvasItem   *item,
     case GIMP_HANDLE_FILLED_CIRCLE:
       cairo_move_to (cr, x, y);
 
-      if (private->slice_angle >= 0)
-        {
-          cairo_arc_negative (cr, x, y, (gdouble) private->width / 2.0,
-                              - private->start_angle,
-                              - private->start_angle - private->slice_angle);
-        }
-      else
-        {
-          cairo_arc (cr, x, y, (gdouble) private->width / 2.0,
-                     - private->start_angle,
-                     - private->start_angle - private->slice_angle);
-        }
+      gimp_cairo_add_arc (cr, x, y, (gdouble) private->width / 2.0,
+                          private->start_angle,
+                          private->slice_angle);
 
       _gimp_canvas_item_fill (item, shell, cr);
       break;
diff --git a/app/widgets/gimpcairo.c b/app/widgets/gimpcairo.c
index 86738ba..e8276e7 100644
--- a/app/widgets/gimpcairo.c
+++ b/app/widgets/gimpcairo.c
@@ -88,6 +88,30 @@ gimp_cairo_stipple_pattern_create (const GimpRGB *fg,
 }
 
 void
+gimp_cairo_add_arc (cairo_t *cr,
+                    gdouble  center_x,
+                    gdouble  center_y,
+                    gdouble  radius,
+                    gdouble  start_angle,
+                    gdouble  slice_angle)
+{
+  g_return_if_fail (cr != NULL);
+
+  if (slice_angle >= 0)
+    {
+      cairo_arc_negative (cr, center_x, center_y, radius,
+                          - start_angle,
+                          - start_angle - slice_angle);
+    }
+  else
+    {
+      cairo_arc (cr, center_x, center_y, radius,
+                 - start_angle,
+                 - start_angle - slice_angle);
+    }
+}
+
+void
 gimp_cairo_add_segments (cairo_t    *cr,
                          GdkSegment *segs,
                          gint        n_segs)
diff --git a/app/widgets/gimpcairo.h b/app/widgets/gimpcairo.h
index 52cb071..9328d95 100644
--- a/app/widgets/gimpcairo.h
+++ b/app/widgets/gimpcairo.h
@@ -29,6 +29,12 @@ cairo_pattern_t * gimp_cairo_stipple_pattern_create (const GimpRGB *fg,
                                                      const GimpRGB *bg,
                                                      gint           index);
 
+void              gimp_cairo_add_arc                (cairo_t       *cr,
+                                                     gdouble        center_x,
+                                                     gdouble        center_y,
+                                                     gdouble        radius,
+                                                     gdouble        start_angle,
+                                                     gdouble        slice_angle);
 void              gimp_cairo_add_segments           (cairo_t       *cr,
                                                      GdkSegment    *segs,
                                                      gint           n_segs);