From 02c5ac41e41fb335cd2946bfbb9e418a9116ba48 Mon Sep 17 00:00:00 2001
From: Tavmjong Bah <tavmjong@free.fr>
Date: Tue, 14 Mar 2017 11:17:48 +0100
Subject: Add functions to rotate drawing inside desktop.

(bzr r15595)
---
 src/desktop.cpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/desktop.h   |  5 +++++
 2 files changed, 47 insertions(+)

(limited to 'src')

diff --git a/src/desktop.cpp b/src/desktop.cpp
index ddd5dfe83..f33c2bc29 100644
--- a/src/desktop.cpp
+++ b/src/desktop.cpp
@@ -1085,6 +1085,48 @@ SPDesktop::zoom_grab_focus()
 }
 
 
+/**
+ * Rotate keeping the point 'c' fixed in the desktop window.
+ */
+void
+SPDesktop::rotate_absolute_keep_point (Geom::Point const &c, double rotate)
+{
+    Geom::Point w = d2w( c ); // Must be before rotate changed.
+    _current_affine.setRotate( rotate );
+    set_display_area( c, w );
+}
+
+
+void 
+SPDesktop::rotate_relative_keep_point (Geom::Point const &c, double rotate)
+{
+    Geom::Point w = d2w( c ); // Must be before rotate changed.
+    _current_affine.addRotate( rotate );
+    set_display_area( c, w );
+}
+
+
+/**
+ * Rotate aligning the point 'c' to the center of desktop window.
+ */
+void 
+SPDesktop::rotate_absolute_center_point (Geom::Point const &c, double rotate)
+{
+    _current_affine.setRotate( rotate );
+    Geom::Rect viewbox = canvas->getViewbox();
+    set_display_area( c, viewbox.midpoint() );
+}
+
+
+void 
+SPDesktop::rotate_relative_center_point (Geom::Point const &c, double rotate)
+{
+    _current_affine.addRotate( rotate );
+    Geom::Rect viewbox = canvas->getViewbox();
+    set_display_area( c, viewbox.midpoint() );
+}
+
+
 /**
  * Scroll canvas by to a particular point (window coordinates).
  */
diff --git a/src/desktop.h b/src/desktop.h
index 2d2297c6b..3dc11b557 100644
--- a/src/desktop.h
+++ b/src/desktop.h
@@ -346,6 +346,11 @@ public:
 
     void zoom_grab_focus();
 
+    void rotate_absolute_keep_point   (Geom::Point const &c, double const rotate);
+    void rotate_relative_keep_point   (Geom::Point const &c, double const rotate);
+    void rotate_absolute_center_point (Geom::Point const &c, double const rotate);
+    void rotate_relative_center_point (Geom::Point const &c, double const rotate);
+
     void scroll_absolute (Geom::Point const &point, bool is_scrolling = false);
     void scroll_relative (Geom::Point const &delta, bool is_scrolling = false);
     void scroll_relative_in_svg_coords (double dx, double dy, bool is_scrolling = false);
-- 
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