/*
* ARDemoCameraScreen.java
*
* Copyright � 1998-2011 Research In Motion Limited
*
* 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.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.augmentedrealitydemo;
import javax.microedition.media.Player;
import javax.microedition.media.control.GUIControl;
import javax.microedition.media.control.VideoControl;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.ComponentCanvas;
import net.rim.device.api.ui.container.MainScreen;
/**
* MainScreen subclass for the Augmented Reality Demo application. This screen
* positions a rotating 3D cube on top of the camera view finder. The cube
* changes its axis of rotation when the orientation of the device changes.
*/
public final class ARDemoCameraScreen extends MainScreen {
private Field _cameraField;
private Player _player;
private DemoGLField _glField;
private static final int GL_FIELD_HEIGHT = Display.getHeight() / 3;
private static final int GL_FIELD_WIDTH = GL_FIELD_HEIGHT;
private static final int GL_FRAME_RATE = 60;
/**
* Creates a new ARDemoCameraScreen object
*/
public ARDemoCameraScreen() {
// Set the title of the screen
setTitle("Augmented Reality Demo");
// Initialize the camera object and camera field
initializeCamera();
// If the camera field was constructed successfully, create the UI
if (_cameraField != null) {
// Add the camera field to a new ComponentCanvas
final ComponentCanvas compCanvas =
new ComponentCanvas(Display.getWidth(), Display.getHeight());
compCanvas.add(_cameraField, 0, 0);
// Initialize GLField
_glField = new DemoGLField(GL_FIELD_WIDTH, GL_FIELD_HEIGHT);
_glField.setTargetFrameRate(GL_FRAME_RATE);
// Add the GLField to the canvas
compCanvas.add(_glField, 100, 100);
// Add the ComponentCanvas to the screen
add(compCanvas);
} else {
add(new RichTextField("Error connecting to camera"));
}
}
/**
* @see net.rim.device.api.ui.Screen#close()
*/
public void close() {
if (_player != null) {
try {
_player.close();
} catch (final Exception e) {
}
}
_glField.cleanUp();
super.close();
}
/**
* Initializes the Player, VideoControl and camera field
*/
private void initializeCamera() {
try {
// Create a player for the camera view finder
_player =
javax.microedition.media.Manager
.createPlayer("capture://video");
// Set the player to the REALIZED state
_player.realize();
// Get the video control
final VideoControl videoControl =
(VideoControl) _player.getControl("VideoControl");
if (videoControl != null) {
// Create the video field as a GUI primitive
_cameraField =
(Field) videoControl.initDisplayMode(
GUIControl.USE_GUI_PRIMITIVE,
"net.rim.device.api.ui.Field");
videoControl.setDisplayFullScreen(true);
videoControl.setVisible(true);
}
// Set the player to the STARTED state
_player.start();
} catch (final Exception e) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert("ERROR " + e.getClass() + ": "
+ e.getMessage());
}
});
}
}
}