Add init_alignment() function.

include/mapnik/text/placement_finder_ng.hpp

@@ -101,6 +101,7 @@ public:
 
     bool next_position();
 private:
+    void init_alignment();
     Feature const& feature_;
     DetectorType const& detector_;
     box2d<double> const& extent_;
@@ -108,6 +109,10 @@ private:
     text_layout layout_;
     text_placement_info_ptr info_;
     bool valid_;
+
+    vertical_alignment_e valign_;
+    horizontal_alignment_e halign_;
+    justify_alignment_e jalign_;
 };
 
 typedef boost::shared_ptr<placement_finder_ng> placement_finder_ng_ptr;

src/text/placement_finder_ng.cpp

@@ -68,10 +68,60 @@ bool placement_finder_ng::next_position()
     } else {
         angle_ = 0.0;
     }
+    init_alignment();
     return true;
 }
 
 
+void placement_finder_ng::init_alignment()
+{
+    text_symbolizer_properties const& p = info_->properties;
+    valign_ = p.valign;
+    if (valign_ == V_AUTO)
+    {
+        if (p.displacement.second > 0.0)
+        {
+            valign_ = V_BOTTOM;
+        } else if (p.displacement.second < 0.0)
+        {
+            valign_ = V_TOP;
+        } else
+        {
+            valign_ = V_MIDDLE;
+        }
+    }
+
+    halign_ = p.halign;
+    if (halign_ == H_AUTO)
+    {
+        if (p.displacement.first > 0.0)
+        {
+            halign_ = H_RIGHT;
+        } else if (p.displacement.first < 0.0)
+        {
+            halign_ = H_LEFT;
+        } else
+        {
+            halign_ = H_MIDDLE;
+        }
+    }
+
+    jalign_ = p.jalign;
+    if (jalign_ == J_AUTO)
+    {
+        if (p.displacement.first > 0.0)
+        {
+            jalign_ = J_LEFT;
+        } else if (p.displacement.first < 0.0)
+        {
+            jalign_ = J_RIGHT;
+        } else {
+            jalign_ = J_MIDDLE;
+        }
+    }
+}
+
+
 glyph_positions::glyph_positions()
     : base_point_(), const_angle_(true)
 {