Reject invalid and dangerous values for the 'step' parameter.

git-svn-id: http://svn.voria.com/code@942 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-core/trunk/src/modules/mod_particle/plant.cpp b/synfig-core/trunk/src/modules/mod_particle/plant.cpp
index bd628a7..4f10df9 100644 (file)
--- a/synfig-core/trunk/src/modules/mod_particle/plant.cpp
+++ b/synfig-core/trunk/src/modules/mod_particle/plant.cpp
@@ -217,6 +217,7 @@ Plant::sync()const
                Real f;
 
                int i=0, branch_count = 0, steps = round_to_int(1.0/step);
+               if (steps < 1) steps = 1;
                for(f=0.0;f<1.0;f+=step,i++)
                {
                        Point point(curve(f));
@@ -273,7 +274,15 @@ Plant::set_param(const String & param, const ValueBase &value)
        IMPORT_PLUS(gradient,needs_sync_=true);
        IMPORT_PLUS(velocity,needs_sync_=true);
        IMPORT_PLUS(perp_velocity,needs_sync_=true);
-       IMPORT_PLUS(step,needs_sync_=true);
+       IMPORT_PLUS(step,{
+                       needs_sync_ = true;
+                       if (step <= 0)
+                               step=0.01; // user is probably clueless - give a good default
+                       else if (step < 0.00001)
+                               step=0.00001; // 100K should be enough for anyone
+                       else if (step > 1)
+                               step=1;
+               });
        IMPORT_PLUS(splits,needs_sync_=true);
        IMPORT_PLUS(sprouts,needs_sync_=true);
        IMPORT_PLUS(random_factor,needs_sync_=true);