Added OpenNI2 camera

git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@1363 f169173b-cf89-36c8-b27e-44dbe73f0c83

CMakeLists.txt

@@ -137,6 +137,7 @@ FIND_PACKAGE(PCL 1.7 REQUIRED)
 FIND_PACKAGE(VTK REQUIRED)
 FIND_PACKAGE(ZLIB REQUIRED)
 FIND_PACKAGE(Freenect)
+FIND_PACKAGE(OpenNI2)
 
 # If Qt is here, the GUI will be built
 FIND_PACKAGE(Qt4 COMPONENTS QtCore QtGui QtSvg) 
@@ -319,9 +320,17 @@ ENDIF(NOT WIN32)
 IF(APPLE)
 MESSAGE(STATUS "  BUILD_AS_BUNDLE = ${BUILD_AS_BUNDLE}")
 ENDIF(APPLE)
+
 IF(Freenect_FOUND)
-MESSAGE(STATUS "  Freenect found.")
+MESSAGE(STATUS "  With Freenect = YES")
 ELSE()
-MESSAGE(STATUS "  Freenect (libfreenect) not found.")
+MESSAGE(STATUS "  With Freenect = NO (libfreenect not found)")
 ENDIF()
+
+IF(OpenNI2_FOUND)
+MESSAGE(STATUS "  With OpenNI2  = YES")
+ELSE()
+MESSAGE(STATUS "  With OpenNI2  = NO (OpenNI2 not found)")
+ENDIF()
+
 MESSAGE(STATUS "--------------------------------------------")

cmake_modules/FindOpenNI2.cmake

@@ -0,0 +1,29 @@
+# - Find OpenNI2
+# This module finds an installed OpenNI2 package.
+#
+# It sets the following variables:
+#  OpenNI2_FOUND       - Set to false, or undefined, if OpenNI2 isn't found.
+#  OpenNI2_INCLUDE_DIRS - The OpenNI2 include directory.
+#  OpenNI2_LIBRARIES     - The OpenNI2 library to link against.
+
+FIND_PATH(OpenNI2_INCLUDE_DIRS OpenNI.h HINTS $ENV{OPENNI2_INCLUDE64} $ENV{OPENNI2_INCLUDE})
+
+FIND_LIBRARY(OpenNI2_LIBRARY NAMES OpenNI2 HINTS $ENV{OPENNI2_LIB64} $ENV{OPENNI2_LIB})
+
+IF (OpenNI2_INCLUDE_DIRS AND OpenNI2_LIBRARY)
+   SET(OpenNI2_FOUND TRUE)
+ENDIF (OpenNI2_INCLUDE_DIRS AND OpenNI2_LIBRARY)
+
+IF (OpenNI2_FOUND)
+   # show which OpenNI2 was found only if not quiet
+   SET(OpenNI2_LIBRARIES ${OpenNI2_LIBRARY})
+   IF (NOT OpenNI2_FIND_QUIETLY)
+      MESSAGE(STATUS "Found OpenNI2")
+   ENDIF (NOT OpenNI2_FIND_QUIETLY)
+ELSE (OpenNI2_FOUND)
+   # fatal error if OpenNI2 is required but not found
+   IF (OpenNI2_FIND_REQUIRED)
+      MESSAGE(FATAL_ERROR "Could not find OpenNI2")
+   ENDIF (OpenNI2_FIND_REQUIRED)
+ENDIF (OpenNI2_FOUND)
+

corelib/include/rtabmap/core/Camera.h

@@ -31,6 +31,12 @@
 class UDirectory;
 class UTimer;
 
+namespace openni
+{
+class Device;
+class VideoStream;
+}
+
 namespace rtabmap
 {
 
@@ -165,6 +171,9 @@ class RTABMAP_EXP CameraRGBD :
 	public Camera
 {
 
+public:
+	static bool available();
+
 public:
 	CameraRGBD(float imageRate = 0,
 				bool asus = false);
@@ -178,6 +187,33 @@ protected:
 private:
 	bool _asus;
 	cv::VideoCapture _capture;
+	float _depthFocal;
+};
+
+/////////////////////////
+// CameraOpenNI2
+/////////////////////////
+class RTABMAP_EXP CameraOpenNI2 :
+	public Camera
+{
+
+public:
+	static bool available();
+
+public:
+	CameraOpenNI2(float imageRate = 0);
+	virtual ~CameraOpenNI2();
+
+	virtual bool init();
+
+protected:
+	virtual void captureImage(cv::Mat & rgb, cv::Mat & depth, float & depthConstant);
+
+private:
+	openni::Device * _device;
+	openni::VideoStream * _color;
+	openni::VideoStream * _depth;
+	float _depthFocal;
 };
 
 

corelib/src/CMakeLists.txt

@@ -64,6 +64,18 @@ IF(Freenect_FOUND)
 	)
 ENDIF(Freenect_FOUND)
 
+IF(OpenNI2_FOUND)
+	ADD_DEFINITIONS("-DWITH_OPENNI2")
+	SET(INCLUDE_DIRS
+		${INCLUDE_DIRS}
+		${OpenNI2_INCLUDE_DIRS}
+	)
+	SET(LIBRARIES
+		${LIBRARIES}
+		${OpenNI2_LIBRARIES}
+	)
+ENDIF(OpenNI2_FOUND)
+
 ####################################
 # Generate resources files
 ####################################

corelib/src/Camera.cpp

@@ -31,6 +31,12 @@
 #include <opencv2/imgproc/imgproc.hpp>
 
 #include <iostream>
+#include <cmath>
+
+#ifdef WITH_OPENNI2
+
+#endif
+#include <OpenNI.h>
 
 namespace rtabmap
 {
@@ -382,9 +388,16 @@ void CameraVideo::captureImage(cv::Mat & rgb, cv::Mat & depth, float & depthCons
 /////////////////////////
 // CameraRGBD
 /////////////////////////
+bool CameraRGBD::available()
+{
+	printf("\nOpencV build: \n", cv::getBuildInformation().c_str());
+	return true;
+}
+
 CameraRGBD::CameraRGBD(float imageRate, bool asus) :
 	Camera(imageRate),
-	_asus(asus)
+	_asus(asus),
+	_depthFocal(0.0f)
 {
 
 }
@@ -406,12 +419,14 @@ bool CameraRGBD::init()
 	if(_capture.isOpened())
 	{
 		_capture.set( CV_CAP_OPENNI_IMAGE_GENERATOR_OUTPUT_MODE, CV_CAP_OPENNI_VGA_30HZ );
+		_depthFocal = _capture.get( CV_CAP_OPENNI_DEPTH_GENERATOR_FOCAL_LENGTH );
 		// Print some avalible device settings.
 		UINFO("Depth generator output mode:");
 		UINFO("FRAME_WIDTH        %f", _capture.get( CV_CAP_PROP_FRAME_WIDTH ));
 		UINFO("FRAME_HEIGHT       %f", _capture.get( CV_CAP_PROP_FRAME_HEIGHT ));
 		UINFO("FRAME_MAX_DEPTH    %f mm", _capture.get( CV_CAP_PROP_OPENNI_FRAME_MAX_DEPTH ));
 		UINFO("FPS                %f", _capture.get( CV_CAP_PROP_FPS ));
+		UINFO("Focal              %f", _depthFocal);
 		UINFO("REGISTRATION       %f", _capture.get( CV_CAP_PROP_OPENNI_REGISTRATION ));
 		if(_capture.get( CV_CAP_PROP_OPENNI_REGISTRATION ) == 0.0)
 		{
@@ -450,7 +465,202 @@ void CameraRGBD::captureImage(cv::Mat & rgb, cv::Mat & depth, float & depthConst
 
 		depth = depth.clone();
 		rgb = rgb.clone();
-		depthConstant = 0.001905f;
+		UASSERT(_depthFocal > 0.0f);
+		depthConstant = 1.0f/_depthFocal;
+	}
+	else
+	{
+		ULOGGER_WARN("The camera must be initialized before requesting an image.");
+	}
+}
+
+
+/////////////////////////
+// CameraOpenNI2
+/////////////////////////
+bool CameraOpenNI2::available()
+{
+#ifdef WITH_OPENNI2
+	return true;
+#else
+	return false;
+#endif
+}
+
+CameraOpenNI2::CameraOpenNI2(float imageRate) :
+	Camera(imageRate),
+	_device(new openni::Device()),
+	_color(new openni::VideoStream()),
+	_depth(new openni::VideoStream()),
+	_depthFocal(0.0f)
+{
+}
+
+CameraOpenNI2::~CameraOpenNI2()
+{
+	_color->stop();
+	_color->destroy();
+	_depth->stop();
+	_depth->destroy();
+	_device->close();
+	openni::OpenNI::shutdown();
+
+	delete _device;
+	delete _color;
+	delete _depth;
+}
+
+bool CameraOpenNI2::init()
+{
+	openni::OpenNI::initialize();
+
+	if(_device->open(openni::ANY_DEVICE) != openni::STATUS_OK)
+	{
+		UERROR("CameraOpenNI2: Cannot open device.");
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	if(!_device->isImageRegistrationModeSupported(openni::IMAGE_REGISTRATION_DEPTH_TO_COLOR))
+	{
+		UERROR("CameraOpenNI2: Device doesn't support depth/color registration.");
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	if(_device->getSensorInfo(openni::SENSOR_DEPTH) == NULL ||
+	  _device->getSensorInfo(openni::SENSOR_COLOR) == NULL)
+	{
+		UERROR("CameraOpenNI2: Cannot get sensor info for depth and color.");
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	if(_depth->create(*_device, openni::SENSOR_DEPTH) != openni::STATUS_OK)
+	{
+		UERROR("CameraOpenNI2: Cannot create depth stream.");
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	if(_color->create(*_device, openni::SENSOR_COLOR) != openni::STATUS_OK)
+	{
+		UERROR("CameraOpenNI2: Cannot create color stream.");
+		_depth->destroy();
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	if(_device->setImageRegistrationMode(openni::IMAGE_REGISTRATION_DEPTH_TO_COLOR ) != openni::STATUS_OK)
+	{
+		UERROR("CameraOpenNI2: Failed to set depth/color registration.");
+	}
+
+	_depth->setMirroringEnabled(false);
+	_color->setMirroringEnabled(false);
+
+	const openni::Array<openni::VideoMode>& depthVideoModes = _depth->getSensorInfo().getSupportedVideoModes();
+	for(int i=0; i<depthVideoModes.getSize(); ++i)
+	{
+		UINFO("CameraOpenNI2: Depth video mode %d: fps=%d, pixel=%d, w=%d, h=%d",
+				i,
+				depthVideoModes[i].getFps(),
+				depthVideoModes[i].getPixelFormat(),
+				depthVideoModes[i].getResolutionX(),
+				depthVideoModes[i].getResolutionY());
+	}
+
+	const openni::Array<openni::VideoMode>& colorVideoModes = _color->getSensorInfo().getSupportedVideoModes();
+	for(int i=0; i<colorVideoModes.getSize(); ++i)
+	{
+		UINFO("CameraOpenNI2: Color video mode %d: fps=%d, pixel=%d, w=%d, h=%d",
+				i,
+				colorVideoModes[i].getFps(),
+				colorVideoModes[i].getPixelFormat(),
+				colorVideoModes[i].getResolutionX(),
+				colorVideoModes[i].getResolutionY());
+	}
+
+	openni::VideoMode mMode;
+	mMode.setFps(30);
+	mMode.setResolution(640,480);
+	mMode.setPixelFormat(openni::PIXEL_FORMAT_DEPTH_1_MM);
+	_depth->setVideoMode(mMode);
+
+	openni::VideoMode mModeColor;
+	mModeColor.setFps(30);
+	mModeColor.setResolution(640,480);
+	mModeColor.setPixelFormat(openni::PIXEL_FORMAT_RGB888);
+	_color->setVideoMode(mModeColor);
+
+	UINFO("CameraOpenNI2: Using depth video mode: fps=%d, pixel=%d, w=%d, h=%d, H-FOV=%f rad, V-FOV=%f rad",
+			_depth->getVideoMode().getFps(),
+			_depth->getVideoMode().getPixelFormat(),
+			_depth->getVideoMode().getResolutionX(),
+			_depth->getVideoMode().getResolutionY(),
+			_depth->getHorizontalFieldOfView(),
+			_depth->getVerticalFieldOfView());
+
+	_depthFocal = float(_depth->getVideoMode().getResolutionX()/2) / std::tan(_depth->getHorizontalFieldOfView()/2.0f);
+	UINFO("depth focal = %f", _depthFocal);
+
+	UINFO("CameraOpenNI2: Using color video mode: fps=%d, pixel=%d, w=%d, h=%d, H-FOV=%f rad, V-FOV=%f rad",
+			_color->getVideoMode().getFps(),
+			_color->getVideoMode().getPixelFormat(),
+			_color->getVideoMode().getResolutionX(),
+			_color->getVideoMode().getResolutionY(),
+			_color->getHorizontalFieldOfView(),
+			_color->getVerticalFieldOfView());
+
+	if(_depth->start() != openni::STATUS_OK ||
+	   _color->start() != openni::STATUS_OK)
+	{
+		UERROR("CameraOpenNI2: Cannot start depth and/or color streams.");
+		_depth->stop();
+		_color->stop();
+		_depth->destroy();
+		_color->destroy();
+		_device->close();
+		openni::OpenNI::shutdown();
+		return false;
+	}
+
+	uSleep(1000); // just to make sure the sensor is correctly initialized
+
+	return true;
+}
+
+void CameraOpenNI2::captureImage(cv::Mat & rgb, cv::Mat & depth, float & depthConstant)
+{
+	if(_device->isValid() &&
+		_depth->isValid() &&
+		_color->isValid() &&
+		_device->getSensorInfo(openni::SENSOR_DEPTH) != NULL &&
+		_device->getSensorInfo(openni::SENSOR_COLOR) != NULL)
+	{
+		openni::VideoFrameRef depthFrame, colorFrame;
+
+		_depth->readFrame(&depthFrame);
+		_color->readFrame(&colorFrame);
+
+		if(depthFrame.isValid() && colorFrame.isValid())
+		{
+			int h=depthFrame.getHeight();
+			int w=depthFrame.getWidth();
+			depth = cv::Mat(h, w, CV_16U, (void*)depthFrame.getData()).clone();
+
+			h=colorFrame.getHeight();
+			w=colorFrame.getWidth();
+			cv::Mat tmp(h, w, CV_8UC3, (void *)colorFrame.getData());
+			cv::cvtColor(tmp, rgb, CV_RGB2BGR);
+		}
+		UASSERT(_depthFocal != 0.0f);
+		depthConstant = 1.0f/_depthFocal;
 	}
 	else
 	{

guilib/include/rtabmap/gui/MainWindow.h

@@ -117,6 +117,7 @@ private slots:
 	void selectFreenect();
 	void selectOpenniCv();
 	void selectOpenniCvAsus();
+	void selectOpenni2();
 	void dumpTheMemory();
 	void dumpThePrediction();
 	void downloadAllClouds();

guilib/include/rtabmap/gui/PreferencesDialog.h

@@ -80,7 +80,8 @@ public:
 		kSrcOpenNI_PCL,
 		kSrcFreenect,
 		kSrcOpenNI_CV,
-		kSrcOpenNI_CV_ASUS
+		kSrcOpenNI_CV_ASUS,
+		kSrcOpenNI2
 	};
 
 	enum OdomType {

guilib/src/MainWindow.cpp

@@ -286,6 +286,7 @@ MainWindow::MainWindow(PreferencesDialog * prefDialog, QWidget * parent) :
 	selectSourceImageGrp->addAction(_ui->actionFreenect);
 	selectSourceImageGrp->addAction(_ui->actionOpenNI_CV);
 	selectSourceImageGrp->addAction(_ui->actionOpenNI_CV_ASUS);
+	selectSourceImageGrp->addAction(_ui->actionOpenNI2);
 	this->updateSelectSourceImageMenu(_preferencesDialog->getSourceImageType());
 	connect(_ui->actionImageFiles, SIGNAL(triggered()), this, SLOT(selectImages()));
 	connect(_ui->actionVideo, SIGNAL(triggered()), this, SLOT(selectVideo()));
@@ -298,6 +299,10 @@ MainWindow::MainWindow(PreferencesDialog * prefDialog, QWidget * parent) :
 	_ui->actionFreenect->setEnabled(CameraFreenect::available());
 	connect(_ui->actionOpenNI_CV, SIGNAL(triggered()), this, SLOT(selectOpenniCv()));
 	connect(_ui->actionOpenNI_CV_ASUS, SIGNAL(triggered()), this, SLOT(selectOpenniCvAsus()));
+	_ui->actionOpenNI_CV->setEnabled(CameraRGBD::available());
+	_ui->actionOpenNI_CV_ASUS->setEnabled(CameraRGBD::available());
+	connect(_ui->actionOpenNI2, SIGNAL(triggered()), this, SLOT(selectOpenni2()));
+	_ui->actionOpenNI2->setEnabled(CameraOpenNI2::available());
 
 	connect(_ui->actionSave_state, SIGNAL(triggered()), this, SLOT(saveFigures()));
 	connect(_ui->actionLoad_state, SIGNAL(triggered()), this, SLOT(loadFigures()));
@@ -1841,6 +1846,7 @@ void MainWindow::updateSelectSourceRGBDMenu(bool used, PreferencesDialog::Src sr
 	_ui->actionFreenect->setChecked(used && src == PreferencesDialog::kSrcFreenect);
 	_ui->actionOpenNI_CV->setChecked(used && src == PreferencesDialog::kSrcOpenNI_CV);
 	_ui->actionOpenNI_CV_ASUS->setChecked(used && src == PreferencesDialog::kSrcOpenNI_CV_ASUS);
+	_ui->actionOpenNI2->setChecked(used && src == PreferencesDialog::kSrcOpenNI2);
 }
 
 void MainWindow::changeImgRateSetting()
@@ -2068,11 +2074,22 @@ void MainWindow::startDetection()
 			}
 		}
 		else if(_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI_CV ||
-				_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI_CV_ASUS)
+				_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI_CV_ASUS ||
+				_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI2)
 		{
-			Camera * camera = new CameraRGBD(
-					_preferencesDialog->getGeneralInputRate(),
-					_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI_CV_ASUS);
+			Camera * camera = 0;
+			if(_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI2)
+			{
+				camera = new CameraOpenNI2(
+						_preferencesDialog->getGeneralInputRate());
+			}
+			else
+			{
+				camera = new CameraRGBD(
+						_preferencesDialog->getGeneralInputRate(),
+						_preferencesDialog->getSourceRGBD() == PreferencesDialog::kSrcOpenNI_CV_ASUS);
+			}
+
 			camera->setLocalTransform(_preferencesDialog->getSourceOpenniLocalTransform());
 
 			if(!camera->init())
@@ -2620,6 +2637,11 @@ void MainWindow::selectOpenniCvAsus()
 	_preferencesDialog->selectSourceRGBD(PreferencesDialog::kSrcOpenNI_CV_ASUS);
 }
 
+void MainWindow::selectOpenni2()
+{
+	_preferencesDialog->selectSourceRGBD(PreferencesDialog::kSrcOpenNI2);
+}
+
 
 void MainWindow::dumpTheMemory()
 {

guilib/src/PreferencesDialog.cpp

@@ -238,6 +238,10 @@ PreferencesDialog::PreferencesDialog(QWidget * parent) :
 	_ui->radioButton_freenect->setEnabled(CameraFreenect::available());
 	connect(_ui->radioButton_opennicv, SIGNAL(toggled(bool)), this, SLOT(makeObsoleteSourcePanel()));
 	connect(_ui->radioButton_opennicvasus, SIGNAL(toggled(bool)), this, SLOT(makeObsoleteSourcePanel()));
+	_ui->radioButton_opennicv->setEnabled(CameraRGBD::available());
+	_ui->radioButton_opennicvasus->setEnabled(CameraRGBD::available());
+	connect(_ui->radioButton_openni2, SIGNAL(toggled(bool)), this, SLOT(makeObsoleteSourcePanel()));
+	_ui->radioButton_openni2->setEnabled(CameraOpenNI2::available());
 	connect(_ui->lineEdit_openniDevice, SIGNAL(textChanged(const QString &)), this, SLOT(makeObsoleteSourcePanel()));
 	connect(_ui->lineEdit_openniLocalTransform, SIGNAL(textChanged(const QString &)), this, SLOT(makeObsoleteSourcePanel()));
 
@@ -1611,6 +1615,7 @@ void PreferencesDialog::selectSourceRGBD(Src src)
 	_ui->radioButton_freenect->setChecked(src == kSrcFreenect);
 	_ui->radioButton_opennicv->setChecked(src == kSrcOpenNI_CV);
 	_ui->radioButton_opennicvasus->setChecked(src == kSrcOpenNI_CV_ASUS);
+	_ui->radioButton_openni2->setChecked(src == kSrcOpenNI2);
 
 	if(_obsoletePanels)
 	{
@@ -2533,6 +2538,10 @@ PreferencesDialog::Src PreferencesDialog::getSourceRGBD() const
 	{
 		return kSrcOpenNI_CV_ASUS;
 	}
+	else if (_ui->radioButton_openni2->isChecked())
+	{
+		return kSrcOpenNI2;
+	}
 	else
 	{
 		return kSrcOpenNI_PCL;
@@ -2752,11 +2761,23 @@ void PreferencesDialog::testOdometry(OdomType type)
 			_odomCameraFreenect = 0;
 		}
 	}
-	else if(this->getSourceRGBD() == kSrcOpenNI_CV || this->getSourceRGBD() == kSrcOpenNI_CV_ASUS)
+	else if(this->getSourceRGBD() == kSrcOpenNI_CV ||
+			this->getSourceRGBD() == kSrcOpenNI_CV_ASUS ||
+			this->getSourceRGBD() == kSrcOpenNI2)
 	{
-		Camera * camera = new CameraRGBD(
+		Camera * camera = 0;
+		if(this->getSourceRGBD() == kSrcOpenNI2)
+		{
+			camera = new CameraOpenNI2(
+				this->getGeneralInputRate());
+
+		}
+		else
+		{
+			camera = new CameraRGBD(
 				this->getGeneralInputRate(),
 				this->getSourceRGBD() == kSrcOpenNI_CV_ASUS);
+		}
 		camera->setLocalTransform(this->getSourceOpenniLocalTransform());
 		_odomCameraOpenNICv = new CameraThread(camera);
 		if(!_odomCameraOpenNICv->init())

guilib/src/ui/mainWindow.ui

@@ -94,6 +94,7 @@
       <addaction name="actionFreenect"/>
       <addaction name="actionOpenNI_CV"/>
       <addaction name="actionOpenNI_CV_ASUS"/>
+      <addaction name="actionOpenNI2"/>
      </widget>
      <addaction name="menuImage"/>
      <addaction name="actionDatabase"/>
@@ -1012,6 +1013,11 @@
     <string>OpenNI-CV-ASUS</string>
    </property>
   </action>
+  <action name="actionOpenNI2">
+   <property name="text">
+    <string>OpenNI2</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>

guilib/src/ui/preferencesDialog.ui

@@ -63,9 +63,9 @@
           <property name="geometry">
            <rect>
             <x>0</x>
-            <y>0</y>
+            <y>-331</y>
             <width>609</width>
-            <height>811</height>
+            <height>657</height>
            </rect>
           </property>
           <layout class="QVBoxLayout" name="verticalLayout_16">
@@ -1763,6 +1763,13 @@ when using the file type, logs are saved in LogRtabmap.txt (located in the worki
                            </property>
                           </widget>
                          </item>
+                         <item>
+                          <widget class="QRadioButton" name="radioButton_openni2">
+                           <property name="text">
+                            <string>OpenNI2</string>
+                           </property>
+                          </widget>
+                         </item>
                          <item>
                           <spacer name="horizontalSpacer">
                            <property name="orientation">