Avoid crash in SlopeTool if nothing is selected

[r2c2.git] / source / designer / slopetool.cpp

diff --git a/source/designer/slopetool.cpp b/source/designer/slopetool.cpp
index 58a50e1507cf7efad982cf0b0aaaedb08929fe8f..ef96e558d08f697dd9219c99629b2779583b517a 100644 (file)
--- a/source/designer/slopetool.cpp
+++ b/source/designer/slopetool.cpp
@@ -9,6 +9,13 @@ SlopeTool::SlopeTool(Designer &d, Input::Keyboard &k, Input::Mouse &m, const set
        Tool(d, k, m),
        total_length(0)
 {
+       if(objects.empty())
+       {
+               set_status("Nothing selected");
+               set_done(false);
+               return;
+       }
+
        for(set<Object *>::const_iterator i=objects.begin(); i!=objects.end(); ++i)
                if(!dynamic_cast<Track *>(*i) || (*i)->get_n_link_slots()!=2)
                {
@@ -38,6 +45,9 @@ SlopeTool::SlopeTool(Designer &d, Input::Keyboard &k, Input::Mouse &m, const set
 
 void SlopeTool::even_slope(bool smooth)
 {
+       if(done)
+               return;
+
        float start_z = tracks.front()->get_snap_node(tracks.front().entry()).position.z;
        float end_z = tracks.back()->get_snap_node(tracks.back().reverse().entry()).position.z;
 
@@ -70,10 +80,15 @@ void SlopeTool::even_slope(bool smooth)
                set_slope(*i, cur_z, tilt);
                cur_z += (*i)->get_type().get_path_length(0)*(end_z-start_z)/length;
        }
+
+       set_done(true);
 }
 
 void SlopeTool::flatten()
 {
+       if(done)
+               return;
+
        float z = 0;
        for(list<TrackIter>::iterator i=tracks.begin(); i!=tracks.end(); ++i)
        {
@@ -89,6 +104,8 @@ void SlopeTool::flatten()
                (*i)->set_position(Vector(p.x, p.y, z));
                (*i)->set_tilt(Angle::zero());
        }
+
+       set_done(true);
 }
 
 void SlopeTool::set_slope(const TrackIter &track, float z, const Angle &tilt)