Merge pull request #3934 from mshabunin:add-cpp-sample-project

doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.markdown

@@ -53,9 +53,9 @@ Now you have to create your CMakeLists.txt file. It should look like this:
 cmake_minimum_required(VERSION 2.8)
 project( DisplayImage )
 find_package( OpenCV REQUIRED )
-include_directories( \f${OpenCV_INCLUDE_DIRS} )
+include_directories( ${OpenCV_INCLUDE_DIRS} )
 add_executable( DisplayImage DisplayImage.cpp )
-target_link_libraries( DisplayImage \f${OpenCV_LIBS} )
+target_link_libraries( DisplayImage ${OpenCV_LIBS} )
 @endcode
 ### Generate the executable
 

samples/cpp/example_cmake/CMakeLists.txt

+# cmake needs this line
+cmake_minimum_required(VERSION 2.8)
+
+# Define project name
+project(opencv_example_project)
+
+# Find OpenCV, you may need to set OpenCV_DIR variable
+# to the absolute path to the directory containing OpenCVConfig.cmake file
+# via the command line or GUI
+find_package(OpenCV REQUIRED)
+
+# If the package has been found, several variables will
+# be set, you can find the full list with descriptions
+# in the OpenCVConfig.cmake file.
+# Print some message showing some of them
+message(STATUS "OpenCV library status:")
+message(STATUS "    version: ${OpenCV_VERSION}")
+message(STATUS "    libraries: ${OpenCV_LIBS}")
+message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
+
+# Add OpenCV headers location to your include paths
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+# Declare the executable target built from your sources
+add_executable(opencv_example example.cpp)
+
+# Link your application with OpenCV libraries
+target_link_libraries(opencv_example ${OpenCV_LIBS})

samples/cpp/example_cmake/example.cpp

+#include "opencv2/core.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/videoio.hpp"
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+void drawText(Mat & image);
+
+int main()
+{
+    cout << "Built with OpenCV " << CV_VERSION << endl;
+    Mat image;
+    VideoCapture capture;
+    capture.open(0);
+    if(capture.isOpened())
+    {
+        cout << "Capture is opened" << endl;
+        for(;;)
+        {
+            capture >> image;
+            if(image.empty())
+                break;
+            drawText(image);
+            imshow("Sample", image);
+            if(waitKey(10) >= 0)
+                break;
+        }
+    }
+    else
+    {
+        cout << "No capture" << endl;
+        image = Mat::zeros(480, 640, CV_8UC1);
+        drawText(image);
+        imshow("Sample", image);
+        waitKey(0);
+    }
+    return 0;
+}
+
+void drawText(Mat & image)
+{
+    putText(image, "Hello OpenCV",
+            Point(20, 50),
+            FONT_HERSHEY_COMPLEX, 1, // font face and scale
+            Scalar(255, 255, 255), // white
+            1, LINE_AA); // line thickness and type
+}