Add grits_viewer_unproject function

[grits] / src / grits-viewer.h

diff --git a/src/grits-viewer.h b/src/grits-viewer.h
index 15d9d70cdeffde2ed9c956ba6190165835a4d10d..8991cb5f3b2bd9754c555b8871cd8c9225aef562 100644 (file)
--- a/src/grits-viewer.h
+++ b/src/grits-viewer.h
@@ -131,6 +131,9 @@ struct _GritsViewerClass {
        void (*project)          (GritsViewer *viewer,
                                  gdouble lat, gdouble lon, gdouble elev,
                                  gdouble *px, gdouble *py, gdouble *pz);
+       void (*unproject)        (GritsViewer *viewer,
+                                 gdouble px, gdouble py,gdouble pz,
+                                 gdouble *lat, gdouble *lon, gdouble *elev);
 
        void (*clear_height_func)(GritsViewer *viewer);
        void (*set_height_func)  (GritsViewer *viewer, GritsBounds *bounds,
@@ -171,6 +174,9 @@ void grits_viewer_center_position(GritsViewer *viewer,
 void grits_viewer_project(GritsViewer *viewer,
                gdouble lat, gdouble lon, gdouble elev,
                gdouble *px, gdouble *py, gdouble *pz);
+void grits_viewer_unproject(GritsViewer *viewer,
+               gdouble px, gdouble py, gdouble pz,
+               gdouble *lat, gdouble *lon, gdouble *elev);
 
 void grits_viewer_clear_height_func(GritsViewer *viewer);
 void grits_viewer_set_height_func(GritsViewer *viewer, GritsBounds *bounds,