Android Open Source - geoar-app Reality Camera

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 */*w w  w  . j ava2  s . c  om*/
 * 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.
 */
package org.n52.geoar.tracking.camera;

import java.util.ArrayList;
import java.util.List;

import org.n52.geoar.GeoARApplication;
import org.n52.geoar.view.geoar.Settings;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.hardware.Camera.Size;

/**
 * This class sums up all relevant camera parameters and also informs listeners
 * of changed parameters. Data gets updated by {@link CameraView}
 * 
 * @author Holger Hopmann
 * 
 */
public class RealityCamera {
  private static final String CAMERA_HEIGHT_PREF = "cameraHeight";

  public interface CameraUpdateListener {
    void onCameraUpdate();
  }

  public static float height = 1.6f; // "usage height", distance between
                    // ground and device
  public static float fovY = 42.5f;
  // Viewport of camera preview
  public static int cameraViewportWidth;
  public static int cameraViewportHeight;
  private static boolean hasViewportSize = false;

  private static List<CameraUpdateListener> listeners = new ArrayList<CameraUpdateListener>();
  public static float aspect;

  public static void addCameraUpdateListener(CameraUpdateListener listener) {
    listeners.add(listener);
  }

  public static void removeCameraUpdateListener(CameraUpdateListener listener) {
    listeners.remove(listener);
  }

  private static void onUpdate() {
    for (CameraUpdateListener listener : listeners) {
      listener.onCameraUpdate();
    }
  }

  public static void setFovY(float fov) {
    boolean changed = RealityCamera.fovY != fov;
    RealityCamera.fovY = fov;
    if (changed)
      onUpdate();
  }

  public static void setViewportSize(Size size) {
    setViewportSize(size.width, size.height);
  }

  public static void setViewportSize(int width, int height) {
    boolean changed = cameraViewportHeight != height
        || cameraViewportWidth != width;
    cameraViewportHeight = height;
    cameraViewportWidth = width;
    RealityCamera.aspect = width / (float) height;
    hasViewportSize = true;
    if (changed)
      onUpdate();
  }

  public static boolean hasViewportSize() {
    return hasViewportSize;
  }

  @Deprecated
  public static void setAspect(float aspect) {
    // RealityCamera.aspect = aspect;
  }

  public static void changeHeight(float inc) {
    height += inc;
    onUpdate();
  }

  public static void setHeight(float height) {
    RealityCamera.height = height;
    onUpdate();
  }

  public static void saveState() {
    SharedPreferences preferences = GeoARApplication.applicationContext
        .getSharedPreferences(GeoARApplication.PREFERENCES_FILE,
            Context.MODE_PRIVATE);
    Editor editor = preferences.edit();
    editor.putFloat(CAMERA_HEIGHT_PREF, RealityCamera.height);
    editor.commit();
  }

  public static void restoreState() {
    SharedPreferences prefs = GeoARApplication.applicationContext
        .getSharedPreferences(GeoARApplication.PREFERENCES_FILE,
            Context.MODE_PRIVATE);
    RealityCamera.setHeight(prefs.getFloat(CAMERA_HEIGHT_PREF, 1.6f));
  }
}

Java Source Code List

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