* Copyright 2012 MANC LLC.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

*    http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

* Sample 8 - how to let the user pick (select) objects in the scene using the mouse or key presses. Can be used for shooting, opening doors, etc.

*/

  public static void main(String[] args) {

    HelloPicking app = new HelloPicking();

    app.start();

  }

  Node shootables;

  Geometry mark;

  @Override

  public void simpleInitApp() {

    initCrossHairs(); // a "+" in the middle of the screen to help aiming

    initKeys(); // load custom key mappings

    initMark(); // a red sphere to mark the hit

    /** create four colored boxes and a floor to shoot at: */

    shootables = new Node("Shootables");

    rootNode.attachChild(shootables);

    shootables.attachChild(makeCube("a Dragon", -2f, 0f, 1f));

    shootables.attachChild(makeCube("a tin can", 1f, -2f, 0f));

    shootables.attachChild(makeCube("the Sheriff", 0f, 1f, -2f));

    shootables.attachChild(makeCube("the Deputy", 1f, 0f, -4f));

    shootables.attachChild(makeFloor());

  }

  /** Declaring the "Shoot" action and mapping to its triggers. */

  private void initKeys() {

    inputManager.addMapping("Shoot", new KeyTrigger(KeyInput.KEY_SPACE), // trigger 1: spacebar

        new MouseButtonTrigger(MouseInput.BUTTON_LEFT)); // trigger 2: left-button click

    inputManager.addListener(actionListener, "Shoot");

  }

  /** Defining the "Shoot" action: Determine what was hit and how to respond. */

  private ActionListener actionListener = new ActionListener() {

    @Override

    public void onAction(String name, boolean keyPressed, float tpf) {

      if (name.equals("Shoot") && !keyPressed) {

        // 1. Reset results list.

        CollisionResults results = new CollisionResults();

        // 2. Aim the ray from cam loc to cam direction.

        Ray ray = new Ray(cam.getLocation(), cam.getDirection());

        // 3. Collect intersections between Ray and Shootables in results list.

        shootables.collideWith(ray, results);

        // 4. Print the results

        System.out.println("----- Collisions? " + results.size() + "-----");

        for (int i = 0; i < results.size(); i++) {

          // For each hit, we know distance, impact point, name of geometry.

          float dist = results.getCollision(i).getDistance();

          Vector3f pt = results.getCollision(i).getContactPoint();

          String hit = results.getCollision(i).getGeometry().getName();

          System.out.println("* Collision #" + i);

          System.out.println("  You shot " + hit + " at " + pt + ", " + dist + " wu away.");

        }

        // 5. Use the results (we mark the hit object)

        if (results.size() > 0) {

          // The closest collision point is what was truly hit:

          CollisionResult closest = results.getClosestCollision();

          // Let's interact - we mark the hit with a red dot.

          mark.setLocalTranslation(closest.getContactPoint());

          rootNode.attachChild(mark);

        } else {

          // No hits? Then remove the red mark.

          rootNode.detachChild(mark);

        }

      }

    }

  };

  /** A cube object for target practice */

  protected Geometry makeCube(String name, float x, float y, float z) {

    Box box = new Box(new Vector3f(x, y, z), 1, 1, 1);

    Geometry cube = new Geometry(name, box);

    Material mat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

    mat1.setColor("Color", ColorRGBA.randomColor());

    cube.setMaterial(mat1);

    return cube;

  }

  /** A floor to show that the "shot" can go through several objects. */

  protected Geometry makeFloor() {

    Box box = new Box(new Vector3f(0, -4, -5), 15, .2f, 15);

    Geometry floor = new Geometry("the Floor", box);

    Material mat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

    mat1.setColor("Color", ColorRGBA.Gray);

    floor.setMaterial(mat1);

    return floor;

  }

  /** A red ball that marks the last spot that was "hit" by the "shot". */

  protected void initMark() {

    Sphere sphere = new Sphere(30, 30, 0.2f);

    mark = new Geometry("BOOM!", sphere);

    Material mark_mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

    mark_mat.setColor("Color", ColorRGBA.Red);

    mark.setMaterial(mark_mat);

  }

  /** A centred plus sign to help the player aim. */

  protected void initCrossHairs() {

    guiNode.detachAllChildren();

    guiFont = assetManager.loadFont("Interface/Fonts/Default.fnt");

    BitmapText ch = new BitmapText(guiFont, false);

    ch.setSize(guiFont.getCharSet().getRenderedSize() * 2);

    ch.setText("+"); // crosshairs

    ch.setLocalTranslation( // center

        settings.getWidth() / 2 - guiFont.getCharSet().getRenderedSize() / 3 * 2, settings.getHeight() / 2 + ch.getLineHeight() / 2, 0);

    guiNode.attachChild(ch);

  }

}