From 7a8af702272bac1fbba95077d0ddbebfa54f01ca Mon Sep 17 00:00:00 2001
From: cilix42 <cilix42@users.sourceforge.net>
Date: Wed, 16 Jan 2008 00:12:43 +0000
Subject: [PATCH] Make path segments convertable to guides, too

---
 src/pen-context.cpp    |  8 ++++++++
 src/pencil-context.cpp |  9 +++++++++
 src/sp-path.cpp        | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/src/pen-context.cpp b/src/pen-context.cpp
index 326791275..f56714eb7 100644
--- a/src/pen-context.cpp
+++ b/src/pen-context.cpp
@@ -23,6 +23,7 @@
 #include "desktop.h"
 #include "desktop-handles.h"
 #include "selection.h"
+#include "selection-chemistry.h"
 #include "draw-anchor.h"
 #include "message-stack.h"
 #include "message-context.h"
@@ -979,6 +980,13 @@ pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
                 ret = TRUE;
             }
             break;
+        case GDK_g:
+        case GDK_G:
+            if (MOD__SHIFT_ONLY) {
+                sp_selection_to_guides();
+                ret = true;
+            }
+            break;
         case GDK_BackSpace:
         case GDK_Delete:
         case GDK_KP_Delete:
diff --git a/src/pencil-context.cpp b/src/pencil-context.cpp
index 1ee39d530..f17337183 100644
--- a/src/pencil-context.cpp
+++ b/src/pencil-context.cpp
@@ -21,6 +21,7 @@
 #include "desktop.h"
 #include "desktop-handles.h"
 #include "selection.h"
+#include "selection-chemistry.h"
 #include "draw-anchor.h"
 #include "message-stack.h"
 #include "message-context.h"
@@ -39,6 +40,7 @@
 #include "xml/repr.h"
 #include "document.h"
 #include "desktop-style.h"
+#include "macros.h"
 
 static void sp_pencil_context_class_init(SPPencilContextClass *klass);
 static void sp_pencil_context_init(SPPencilContext *pc);
@@ -509,6 +511,13 @@ pencil_handle_key_press(SPPencilContext *const pc, guint const keyval, guint con
                 }
             }
             break;
+        case GDK_g:
+        case GDK_G:
+            if (mod_shift_only(state)) {
+                sp_selection_to_guides();
+                ret = true;
+            }
+            break;
         default:
             break;
     }
diff --git a/src/sp-path.cpp b/src/sp-path.cpp
index d97bbddb9..a8e3ad6ee 100644
--- a/src/sp-path.cpp
+++ b/src/sp-path.cpp
@@ -30,6 +30,7 @@
 #include "attributes.h"
 
 #include "sp-path.h"
+#include "sp-guide.h"
 
 #include "document.h"
 
@@ -46,6 +47,7 @@ static void sp_path_set(SPObject *object, unsigned key, gchar const *value);
 static Inkscape::XML::Node *sp_path_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
 static NR::Matrix sp_path_set_transform(SPItem *item, NR::Matrix const &xform);
 static gchar * sp_path_description(SPItem *item);
+static void sp_path_convert_to_guides(SPItem *item);
 
 static void sp_path_update(SPObject *object, SPCtx *ctx, guint flags);
 static void sp_path_update_patheffect(SPShape *shape, bool write);
@@ -101,6 +103,7 @@ sp_path_class_init(SPPathClass * klass)
 
     item_class->description = sp_path_description;
     item_class->set_transform = sp_path_set_transform;
+    item_class->convert_to_guides = sp_path_convert_to_guides;
 
     shape_class->update_patheffect = sp_path_update_patheffect;
 }
@@ -133,6 +136,39 @@ sp_path_description(SPItem * item)
     }
 }
 
+static void
+sp_path_convert_to_guides(SPItem *item)
+{
+    SPPath *path = SP_PATH(item);
+
+    SPDocument *doc = SP_OBJECT_DOCUMENT(path);
+    std::list<std::pair<Geom::Point, Geom::Point> > pts;
+
+    NR::Matrix const i2d (sp_item_i2d_affine(SP_ITEM(path)));
+
+    SPCurve *curve = SP_SHAPE(path)->curve;
+    if (!curve) return;
+    NArtBpath *bpath = SP_CURVE_BPATH(curve);
+
+    NR::Point last_pt;
+    NR::Point pt;
+    for (int i = 0; bpath[i].code != NR_END; i++){
+        if (bpath[i].code == NR_LINETO) {
+            /* we only convert straight line segments (converting curve segments would be unintuitive) */
+            pt = bpath[i].c(3) * i2d;
+            pts.push_back(std::make_pair(last_pt.to_2geom(), pt.to_2geom()));
+        }
+
+        /* remember current point for potential reuse in the next step
+           (e.g., in case this was an NR_MOVETO or NR_MOVETO_OPEN) */
+        last_pt = bpath[i].c(3) * i2d;
+    }
+
+    sp_guide_pt_pairs_to_guides(doc, pts);
+
+    SP_OBJECT(path)->deleteObject(true);
+}
+
 /**
  * Initializes an SPPath.
  */
-- 
2.30.2