Added a new parameter to the plant layer, "Perpendicular Velocity" which controls...

[synfig.git] / synfig-core / trunk / src / modules / mod_particle / plant.cpp

diff --git a/synfig-core/trunk/src/modules/mod_particle/plant.cpp b/synfig-core/trunk/src/modules/mod_particle/plant.cpp
index 869a613..78aa6f7 100644 (file)
--- a/synfig-core/trunk/src/modules/mod_particle/plant.cpp
+++ b/synfig-core/trunk/src/modules/mod_particle/plant.cpp
@@ -78,6 +78,7 @@ Plant::Plant():
        split_angle(Angle::deg(10)),
        gravity(0,-0.1),
        velocity(0.3),
+       perp_velocity(0.3),
        step(0.01),
        sprouts(10)
 {
@@ -227,12 +228,12 @@ Plant::sync()const
                        Real stunt_growth(random_factor * random(Random::SMOOTH_COSINE,i,f+seg,0.0f,0.0f)/2.0+0.5);
                        stunt_growth*=stunt_growth;
 
-                       Vector branch_velocity(deriv(f).norm()*velocity);
+                       if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
+                               Vector branch_velocity(deriv(f).norm()*velocity + deriv(f).perp().norm()*perp_velocity);
 
-                       branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
-                       branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
+                               branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
+                               branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
 
-                       if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
                                branch_count++;
                                branch(i, 0, 0,          // time
                                           stunt_growth, // stunt growth
@@ -265,6 +266,7 @@ Plant::set_param(const String & param, const ValueBase &value)
        IMPORT_PLUS(gravity,needs_sync_=true);
        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(splits,needs_sync_=true);
        IMPORT_PLUS(sprouts,needs_sync_=true);
@@ -309,6 +311,7 @@ Plant::get_param(const String& param)const
        EXPORT(split_angle);
        EXPORT(gravity);
        EXPORT(velocity);
+       EXPORT(perp_velocity);
        EXPORT(step);
        EXPORT(gradient);
        EXPORT(splits);
@@ -354,8 +357,13 @@ Plant::get_param_vocab()const
        );
 
        ret.push_back(ParamDesc("velocity")
-               .set_local_name(_("Velocity"))
-               .set_description(_("Amount to which shoots tend to follow the tangent of the BLine"))
+               .set_local_name(_("Tangential Velocity"))
+               .set_description(_("Amount to which shoots tend to grow along the tangent to the BLine"))
+       );
+
+       ret.push_back(ParamDesc("perp_velocity")
+               .set_local_name(_("Perpendicular Velocity"))
+               .set_description(_("Amount to which shoots tend to grow perpendicular to the tangent to the BLine"))
        );
 
        ret.push_back(ParamDesc("size")