Checked in osgParticle, writtten by Marco Jez.

src/osgParticle/MultiSegmentPlacer.cpp

@@ -0,0 +1,51 @@
+#include <osgParticle/MultiSegmentPlacer>
+#include <osgParticle/Placer>
+
+#include <osg/CopyOp>
+#include <osg/Vec3>
+
+osgParticle::MultiSegmentPlacer::MultiSegmentPlacer()
+: Placer(), total_length_(0)
+{
+}
+    
+osgParticle::MultiSegmentPlacer::MultiSegmentPlacer(const MultiSegmentPlacer &copy, const osg::CopyOp &copyop)
+: Placer(copy, copyop), vx_(copy.vx_), total_length_(copy.total_length_)
+{
+}
+
+void osgParticle::MultiSegmentPlacer::recompute_length()
+{
+    Vertex_vector::iterator i;
+    Vertex_vector::iterator i0 = vx_.begin();
+        
+    total_length_ = 0;
+    for (i=vx_.begin(); i!=vx_.end(); ++i) {
+        total_length_ += (i->first - i0->first).length();
+        i->second = total_length_;
+        i0 = i;            
+    }
+}
+
+void osgParticle::MultiSegmentPlacer::place(Particle *P) const
+{
+    if (vx_.size() >= 2) {
+        float x = rangef(0, total_length_).get_random();
+        
+        Vertex_vector::const_iterator i;
+        Vertex_vector::const_iterator i0 = vx_.begin();
+        const Vertex_vector::const_iterator vend = vx_.end();
+
+        for (i=vx_.begin(); i!=vend; ++i) {
+            if (x <= i->second) {
+                float t = (x - i0->second) / (i->second - i0->second);
+                P->setPosition(i0->first + (i->first - i0->first) * t);
+                return;
+            }
+            i0 = i;
+        }            
+    } else {
+        osg::notify(osg::WARN) << "this MultiSegmentPlacer has less than 2 vertices\n";
+    }
+}
+