Implement decent snapping to text (baseline & anchor), and provide a toggle button for this (as requested in LP bug #727281 )

(bzr r10392)

2 files changed, 23 insertions, 0 deletions

diff --git a/src/libnrtype/Layout-TNG-OutIter.cpp b/src/libnrtype/Layout-TNG-OutIter.cpp
index 4d461a486..1d300b210 100644
--- a/src/libnrtype/Layout-TNG-OutIter.cpp
+++ b/src/libnrtype/Layout-TNG-OutIter.cpp
@@ -13,6 +13,7 @@
 #include "font-instance.h"
 #include "svg/svg-length.h"
 #include <2geom/transforms.h>
+#include <2geom/line.h>
 #include "style.h"
 
 namespace Inkscape {
@@ -250,6 +251,26 @@ boost::optional<Geom::Point> Layout::baselineAnchorPoint() const
     }
 }
 
+Geom::Path Layout::baseline() const
+{
+    iterator pos = this->begin();
+    Geom::Point left_pt = this->characterAnchorPoint(pos);
+    pos.thisEndOfLine();
+    Geom::Point right_pt = this->characterAnchorPoint(pos);
+
+    if (this->_blockProgression() == LEFT_TO_RIGHT || this->_blockProgression() == RIGHT_TO_LEFT) {
+        left_pt = Geom::Point(left_pt[Geom::Y], left_pt[Geom::X]);
+        right_pt = Geom::Point(right_pt[Geom::Y], right_pt[Geom::X]);
+    }
+
+    Geom::Path baseline;
+    baseline.start(left_pt);
+    baseline.appendNew<Geom::LineSegment>(right_pt);
+
+    return baseline;
+}
+
+
 Geom::Point Layout::chunkAnchorPoint(iterator const &it) const
 {
     unsigned chunk_index;
diff --git a/src/libnrtype/Layout-TNG.h b/src/libnrtype/Layout-TNG.h
index 7d0c58c3e..6ab02c0e3 100644
--- a/src/libnrtype/Layout-TNG.h
+++ b/src/libnrtype/Layout-TNG.h
@@ -486,6 +486,8 @@ public:
     For rightmost text, the rightmost... you probably got it by now ;-)*/
     boost::optional<Geom::Point> baselineAnchorPoint() const;
 
+    Geom::Path baseline() const;
+
     /** This is that value to apply to the x,y attributes of tspan role=line
     elements, and hence it takes alignment into account. */
     Geom::Point chunkAnchorPoint(iterator const &it) const;