pt_lights: softly fade in and out the blinking lights

[simgear.git] / simgear / scene / tgdb / pt_lights.cxx

diff --git a/simgear/scene/tgdb/pt_lights.cxx b/simgear/scene/tgdb/pt_lights.cxx
index 2aa6606acbdc56c0cca96914621771ea2e641c47..7e123a475da55583f31b65ba2dd59e28ae846fa8 100644 (file)
--- a/simgear/scene/tgdb/pt_lights.cxx
+++ b/simgear/scene/tgdb/pt_lights.cxx
@@ -540,3 +540,35 @@ SGLightFactory::getOdal(const SGLightBin& lights)
 
   return sequence;
 }
+
+// Blinking hold short line lights
+osg::Node*
+SGLightFactory::getHoldShort(const SGDirectionalLightBin& lights)
+{
+  if (lights.getNumLights() < 2)
+    return 0;
+
+  sg_srandom(unsigned(lights.getLight(0).position[0]));
+  float flashTime = 2 + 0.1 * sg_random();
+  osg::Sequence* sequence = new osg::Sequence;
+
+  // start with lights off
+  sequence->addChild(new osg::Group, flashTime);
+  // ...and increase the lights in steps
+  for (int i = 2; i < 7; i+=2) {
+      Effect* effect = getLightEffect(i, osg::Vec3(1, 0.001, 0.000002),
+                                      0, i, true);
+      EffectGeode* egeode = new EffectGeode;
+      for (unsigned int j = 0; j < lights.getNumLights(); ++j) {
+          egeode->addDrawable(getLightDrawable(lights.getLight(j)));
+          egeode->setEffect(effect);
+      }
+      sequence->addChild(egeode, (i==6) ? flashTime : 0.1);
+  }
+
+  sequence->setInterval(osg::Sequence::SWING, 0, -1);
+  sequence->setDuration(1.0f, -1);
+  sequence->setMode(osg::Sequence::START);
+
+  return sequence;
+}