path: root/NET/worlds/scape/VelocityBehavior.java

package NET.worlds.scape;

import java.io.IOException;

public class VelocityBehavior extends SwitchableBehavior implements FrameHandler, BumpHandler {
   private RollingAttribute attr;
   private long lastTime;
   public float linearVel;
   public float linearDamp;
   protected Point3 dir;
   public float angularVel;
   public float angularDamp;
   public Point3 axis;
   private boolean bumplock = false;
   private static Object classCookie = new Object();

   public VelocityBehavior(
      Point3Temp linearVectorPerSecond, float linearDampingPerSecond, Point3Temp angularAxis, float angularDegPerSecond, float angularDampingPerSecond
   ) {
      this.dir = new Point3();
      this.linearVel = 0.0F;
      this.linearDamp = linearDampingPerSecond;
      this.addVelocity(linearVectorPerSecond);
      this.axis = new Point3(angularAxis);
      this.axis.normalize();
      this.angularVel = angularDegPerSecond;
      this.angularDamp = angularDampingPerSecond;
   }

   public VelocityBehavior() {
      this(Point3Temp.make(0.0F, 0.0F, 0.0F));
   }

   public VelocityBehavior(Point3Temp vel) {
      this(vel, 0.0F, Point3Temp.make(0.0F, 0.0F, 1.0F), 0.0F, 0.0F);
   }

   public void setDir(Point3Temp d) {
      double len = Math.sqrt(d.x * d.x + d.y * d.y + d.z * d.z);
      if (len == 0.0) {
         this.dir.x = 0.0F;
         this.dir.y = 0.0F;
         this.dir.z = 0.0F;
      } else {
         this.dir.x = (float)(d.x / len);
         this.dir.y = (float)(d.y / len);
         this.dir.z = (float)(d.z / len);
      }
   }

   public VelocityBehavior addVelocity(Point3Temp vector) {
      this.dir.times(this.linearVel).plus(vector);
      float len = this.dir.length();
      if (len > 0.0F) {
         this.dir.dividedBy(len);
      }

      this.linearVel = len;
      return this;
   }

   public void setNotifyAttribute(RollingAttribute attr) {
      this.attr = attr;
   }

   @Override
   public boolean handle(FrameEvent e) {
      this.bumplock = false;
      WObject o = e.receiver;
      float dT = (float)(e.time - this.lastTime) / 1000.0F;
      if (this.lastTime == 0L) {
         this.lastTime = e.time;
         return true;
      } else {
         this.lastTime = e.time;
         if (this.linearVel != 0.0F) {
            Point3Temp dist = Point3Temp.make(this.dir).times(dT * this.linearVel);
            o.moveThrough(dist);
            if (this.linearDamp != 0.0F) {
               this.linearVel = (float)(this.linearVel * Math.exp(-this.linearDamp * dT));
               if (Math.abs(this.linearVel) < this.linearDamp * 16.0F) {
                  this.linearVel = 0.0F;
                  if (this.attr != null) {
                     this.attr.notifyStopped();
                  }
               }
            }
         }

         if (this.angularVel != 0.0F) {
            o.spin(this.axis.x, this.axis.y, this.axis.z, this.angularVel * dT);
            if (this.angularDamp != 0.0F) {
               this.angularVel = (float)(this.angularVel * Math.exp(-this.angularDamp * dT));
               if (Math.abs(this.angularVel) < this.angularDamp * 0.6F) {
                  this.angularVel = 0.0F;
               }
            }
         }

         return true;
      }
   }

   @Override
   public boolean handle(BumpEventTemp b) {
      if (this.bumplock) {
         return true;
      } else {
         if (this.attr != null) {
            this.attr.handle(b);
         } else {
            this.processBumpEvent(b);
         }

         this.bumplock = true;
         return true;
      }
   }

   public void processBumpEvent(BumpEventTemp b) {
      b.postBumpPath.minus(b.postBumpPath);
      if (this.dir.x != 0.0F || this.dir.y != 0.0F || this.dir.z != 0.0F) {
         WObject bumper = b.receiver == b.target ? (WObject)b.source : b.target;
         Point3Temp norm;
         if (!(bumper instanceof Camera) && !(bumper instanceof Hologram)) {
            norm = Point3Temp.make(b.bumpNormal);
         } else {
            float orientation = (float)((360.0F - bumper.getYaw() + 90.0F) * Math.PI / 180.0);
            norm = Point3Temp.make((float)Math.cos(orientation), (float)Math.sin(orientation), 0.0F);
         }

         float lb = (float)Math.sqrt(norm.x * norm.x + norm.y * norm.y + norm.z * norm.z);
         norm.x /= lb;
         norm.y /= lb;
         norm.z /= lb;
         float projection = Math.abs(this.dir.x * norm.x + this.dir.y * norm.y + this.dir.z * norm.z);
         this.dir.x = this.dir.x + norm.x * 2.0F * projection;
         this.dir.y = this.dir.y + norm.y * 2.0F * projection;
         this.dir.z = this.dir.z + norm.z * 2.0F * projection;
         double n = Math.sqrt(this.dir.x * this.dir.x + this.dir.y * this.dir.y + this.dir.z * this.dir.z);
         if (n != 0.0) {
            this.dir.x = (float)(this.dir.x / n);
            this.dir.y = (float)(this.dir.y / n);
            this.dir.z = (float)(this.dir.z / n);
         }
      }
   }

   @Override
   public Object properties(int index, int offset, int mode, Object value) throws NoSuchPropertyException {
      Object ret = null;
      switch (index - offset) {
         case 0:
            if (mode == 0) {
               ret = FloatPropertyEditor.make(new Property(this, index, "Linear Velocity"));
            } else if (mode == 1) {
               ret = new Float(this.linearVel);
            } else if (mode == 2) {
               this.linearVel = (Float)value;
            }
            break;
         case 1:
            if (mode == 0) {
               ret = FloatPropertyEditor.make(new Property(this, index, "Linear Damping"));
            } else if (mode == 1) {
               ret = new Float(this.linearDamp);
            } else if (mode == 2) {
               this.linearDamp = (Float)value;
            }
            break;
         case 2:
            if (mode == 0) {
               ret = Point3PropertyEditor.make(new Property(this, index, "Direction"));
            } else if (mode == 1) {
               ret = new Point3(this.dir);
            } else if (mode == 2) {
               this.dir = (Point3)value;
            }
            break;
         case 3:
            if (mode == 0) {
               ret = FloatPropertyEditor.make(new Property(this, index, "Angular Velocity"));
            } else if (mode == 1) {
               ret = new Float(this.angularVel);
            } else if (mode == 2) {
               this.angularVel = (Float)value;
            }
            break;
         case 4:
            if (mode == 0) {
               ret = FloatPropertyEditor.make(new Property(this, index, "Angular Damping"));
            } else if (mode == 1) {
               ret = new Float(this.angularDamp);
            } else if (mode == 2) {
               this.angularDamp = (Float)value;
            }
            break;
         case 5:
            if (mode == 0) {
               ret = Point3PropertyEditor.make(new Property(this, index, "Axis"));
            } else if (mode == 1) {
               ret = new Point3(this.axis);
            } else if (mode == 2) {
               this.axis = (Point3)value;
            }
            break;
         default:
            ret = super.properties(index, offset + 6, mode, value);
      }

      return ret;
   }

   @Override
   public String toString() {
      return super.toString()
         + "[lin. velocity "
         + this.linearVel
         + ", lin. damp "
         + this.linearDamp
         + ", direction "
         + this.dir
         + ", ang. vel "
         + this.angularVel
         + ", ang. damp "
         + this.angularDamp
         + ", axis "
         + this.axis
         + "]";
   }

   @Override
   public void saveState(Saver s) throws IOException {
      s.saveVersion(0, classCookie);
      super.saveState(s);
      s.saveFloat(this.linearVel);
      s.saveFloat(this.linearDamp);
      s.save(this.dir);
      s.saveFloat(this.angularVel);
      s.saveFloat(this.angularDamp);
      s.save(this.axis);
   }

   @Override
   public void restoreState(Restorer r) throws IOException, TooNewException {
      switch (r.restoreVersion(classCookie)) {
         case 0:
            super.restoreState(r);
            this.linearVel = r.restoreFloat();
            this.linearDamp = r.restoreFloat();
            this.dir = (Point3)r.restore();
            this.angularVel = r.restoreFloat();
            this.angularDamp = r.restoreFloat();
            this.axis = (Point3)r.restore();
            return;
         default:
            throw new TooNewException();
      }
   }
}