Add "rotate-displacement".

include/mapnik/text_properties.hpp

@@ -168,6 +168,7 @@ struct text_symbolizer_properties
     bool largest_bbox_only;
     unsigned text_ratio;
     unsigned wrap_width;
+    bool rotate_displacement;
     /** Default values for char_properties. */
     char_properties_ptr format;
 private:

src/text/placement_finder_ng.cpp

@@ -150,6 +150,14 @@ static void rotated_box2d(box2d<double> &box, double sina, double cosa, double w
     box.init(-new_width/2., -new_height/2., new_width/2., new_height/2.);
 }
 
+static pixel_position rotate(pixel_position pos, double sina, double cosa)
+{
+    double tmp_x = pos.x * cosa + pos.y * sina;
+    pos.y = - pos.x * sina + pos.y * cosa;
+    pos.x = tmp_x;
+    return pos;
+}
+
 
 glyph_positions_ptr placement_finder_ng::find_point_placement(pixel_position pos)
 {
@@ -157,9 +165,10 @@ glyph_positions_ptr placement_finder_ng::find_point_placement(pixel_position pos
     if (!layout_.size()) return glyphs; /* No data. Don't return NULL pointer, which would mean
      that not enough space was available. */
 
-    //TODO: Verify enough space is available. For point placement the bounding box is enough!
+    pixel_position displacement = scale_factor_ * info_->properties.displacement + alignment_offset();
+    if (info_->properties.rotate_displacement) displacement = rotate(displacement, sina_, cosa_);
 
-    glyphs->set_base_point(pos + scale_factor_ * info_->properties.displacement + alignment_offset());
+    glyphs->set_base_point(pos + displacement);
     box2d<double> bbox;
     rotated_box2d(bbox, sina_, cosa_, layout_.width(), layout_.height());
     bbox.re_center(glyphs->get_base_point().x, glyphs->get_base_point().y);
@@ -196,8 +205,6 @@ glyph_positions_ptr placement_finder_ng::find_point_placement(pixel_position pos
         else
             x = -((*line_itr)->width() / 2.0);
 
-        //TODO: Rotate
-
         text_line::const_iterator glyph_itr = (*line_itr)->begin(), glyph_end = (*line_itr)->end();
         for (; glyph_itr != glyph_end; glyph_itr++)
         {

src/text_properties.cpp

@@ -54,6 +54,7 @@ text_symbolizer_properties::text_symbolizer_properties() :
     largest_bbox_only(true),
     text_ratio(0),
     wrap_width(0),
+    rotate_displacement(false),
     format(boost::make_shared<char_properties>()),
     tree_()
 {
@@ -112,6 +113,8 @@ void text_symbolizer_properties::from_xml(xml_node const &sym, fontset_map const
     if (jalign_) jalign = *jalign_;
     optional<expression_ptr> orientation_ = sym.get_opt_attr<expression_ptr>("orientation");
     if (orientation_) orientation = *orientation_;
+    optional<boolean> rotate_displacement_ = sym.get_opt_attr<boolean>("rotate-displacement");
+    if (rotate_displacement_) rotate_displacement = *rotate_displacement_;
     optional<double> dx = sym.get_opt_attr<double>("dx");
     if (dx) displacement.x = *dx;
     optional<double> dy = sym.get_opt_attr<double>("dy");
@@ -216,6 +219,10 @@ void text_symbolizer_properties::to_xml(boost::property_tree::ptree &node,
     {
         set_attr(node, "vertical-alignment", valign);
     }
+    if (rotate_displacement != dfl.rotate_displacement || explicit_defaults)
+    {
+        set_attr(node, "rotate-displacement", rotate_displacement);
+    }
     format->to_xml(node, explicit_defaults, *(dfl.format));
     if (tree_) tree_->to_xml(node);
 }

tests/visual_tests/styles/orientation.xml

@@ -46,6 +46,21 @@
             <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" orientation="180" dy="10">"XYZ"</TextSymbolizer>
             <PointSymbolizer allow-overlap="true"/>
         </Rule>
+        <Rule>
+            <Filter>[nr] = '8'</Filter>
+            <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" orientation="0" dx="0.01" dy="-0.01" rotate-displacement="true">"XYZ"</TextSymbolizer>
+            <PointSymbolizer allow-overlap="true"/>
+        </Rule>
+        <Rule>
+            <Filter>[nr] = '9'</Filter>
+            <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" orientation="90" dy="0.01" dx="-0.01" rotate-displacement="false">"XYZ"</TextSymbolizer>
+            <PointSymbolizer allow-overlap="true"/>
+        </Rule>
+        <Rule>
+            <Filter>[nr] = '10'</Filter>
+            <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" orientation="180" dy="10" rotate-displacement="true">"XYZ"</TextSymbolizer>
+            <PointSymbolizer allow-overlap="true"/>
+        </Rule>
     </Style>
 
 </Map>