ammomanager.java

java3D game engine design of the source [three-dimensionalvirtualrealitynetworkprogram] - "virtual

// AmmoManager.java
// Andrew Davison, May 2003, [e-mail]

/* AmmoManager starts by loading a predetermined set of explosion images
   into exploIms[].

   It then creates NUMBEAMS LaserShot objects, and passes a reference
   to the array to each one. This means that the images are only loaded
   once, rather than NUMBEAMS times.

   AmmoManager also handles a fireBeam() call from KeyBehavior by firing 
   a beam if one is available, otherwise doing nothing.
*/

import javax.media.j3d.*;
import com.sun.j3d.utils.image.*;
import javax.vecmath.*;


public class AmmoManager
{
  private final static int NUMBEAMS = 20;
  private LaserShot[] shots;    // for the beams


  public AmmoManager(TransformGroup steerTG, BranchGroup sceneBG, Vector3d targetVec)
  {
    // load the explosion images
    ImageComponent2D[] exploIms = loadImages("explo/explo", 6);

    shots = new LaserShot[NUMBEAMS];
    for(int i=0; i < NUMBEAMS; i++) {
      shots[i] = new LaserShot(steerTG, exploIms, targetVec);
      // a laser shot represents a single beam and explosion
      sceneBG.addChild( shots[i].getTG() );
    }
   }  // end of AmmoManager()


  public void fireBeam()
  // fire an available beam (called from KeyBehavior)
  { 
    for(int i=0; i < NUMBEAMS; i++) {
      if( shots[i].requestFiring() ) {
        // System.out.println("Fired shot " + i);
        return;
      }
    }
   // System.out.println("No free shots");
  }  // end of fireBeam()


  private ImageComponent2D[] loadImages(String fNms, int numIms)
  /* Load the explosion images: they all start with fNms, and there are
     numIms of them. */
  {
    String filename;
    TextureLoader loader;
    ImageComponent2D[] ims = new ImageComponent2D[numIms];
    System.out.println("Loading " + numIms + " textures from " + fNms);
    for (int i=0; i < numIms; i++) {
      filename = new String(fNms + i + ".gif");
      loader = new TextureLoader(filename, null);
      ims[i] = loader.getImage();
      if(ims[i] == null)
        System.out.println("Load failed for texture in : " + filename);
    }
    return ims;
  }  // end of loadImages()

}  // end of AmmoManager class