Added more convienient unit conversion functions.

(bzr r12380.1.26)

2 files changed, 30 insertions, 2 deletions

diff --git a/src/util/units.cpp b/src/util/units.cpp
index 705fc850c..ed8fbfa34 100644
--- a/src/util/units.cpp
+++ b/src/util/units.cpp
@@ -462,9 +462,14 @@ bool Quantity::compatibleWith(const Unit *u) const {
 }
 
 /** Return the quantity's value in the specified unit. */
-double Quantity::value(Unit *u) const {
+double Quantity::value(const Unit *u) const {
     return convert(quantity, unit, u);
 }
+double Quantity::value(const Glib::ustring u) const {
+    static UnitTable unit_table;
+    Unit to_unit = unit_table.getUnit(u);
+    return value(&to_unit);
+}
 
 /** Convert distances. */
 double Quantity::convert(const double from_dist, const Unit *from, const Unit *to) {
@@ -476,6 +481,25 @@ double Quantity::convert(const double from_dist, const Unit *from, const Unit *t
     // Compatible units
     return from_dist * from->factor / to->factor;
 }
+double Quantity::convert(const double from_dist, const Glib::ustring from, const Unit &to)
+{
+    static UnitTable unit_table;
+    Unit from_unit = unit_table.getUnit(from);
+    return convert(from_dist, &from_unit, &to);
+}
+double Quantity::convert(const double from_dist, const Unit &from, const Glib::ustring to)
+{
+    static UnitTable unit_table;
+    Unit to_unit = unit_table.getUnit(to);
+    return convert(from_dist, &from, &to_unit);
+}
+double Quantity::convert(const double from_dist, const Glib::ustring from, const Glib::ustring to)
+{
+    static UnitTable unit_table;
+    Unit from_unit = unit_table.getUnit(from);
+    Unit to_unit = unit_table.getUnit(to);
+    return convert(from_dist, &from_unit, &to_unit);
+}
 
 } // namespace Util
 } // namespace Inkscape
diff --git a/src/util/units.h b/src/util/units.h
index 5d7bfaeaa..f1a5f1e95 100644
--- a/src/util/units.h
+++ b/src/util/units.h
@@ -89,9 +89,13 @@ public:
     
     Quantity(double q, const Unit *u);   // constructor
     bool compatibleWith(const Unit *u) const;
-    double value(Unit *u) const;
+    double value(const Unit *u) const;
+    double value(const Glib::ustring u) const;
     
     static double convert(const double from_dist, const Unit *from, const Unit *to);
+    static double convert(const double from_dist, const Glib::ustring from, const Unit &to);
+    static double convert(const double from_dist, const Unit &from, const Glib::ustring to);
+    static double convert(const double from_dist, const Glib::ustring from, const Glib::ustring to);
 };
 
 class UnitTable {