Doxygen tutorials: cpp done

doc/tutorials/viz/launching_viz/launching_viz.markdown

@@ -15,36 +15,35 @@ Code
 ----
 
 You can download the code from [here ](samples/cpp/tutorial_code/viz/launching_viz.cpp).
-@code{.cpp}
-#include <opencv2/viz.hpp>
-#include <iostream>
+@includelineno samples/cpp/tutorial_code/viz/launching_viz.cpp
 
-using namespace cv;
-using namespace std;
+Explanation
+-----------
 
-/*
-* @function main
-*/
-int main()
-{
+Here is the general structure of the program:
+
+-   Create a window.
+    @code{.cpp}
     /// Create a window
     viz::Viz3d myWindow("Viz Demo");
-
+    @endcode
+-   Start event loop. This event loop will run until user terminates it by pressing **e**, **E**,
+    **q**, **Q**.
+    @code{.cpp}
     /// Start event loop
     myWindow.spin();
-
-    /// Event loop is over when pressed q, Q, e, E
-    cout << "First event loop is over" << endl;
-
+    @endcode
+-   Access same window via its name. Since windows are implicitly shared, **sameWindow** is exactly
+    the same with **myWindow**. If the name does not exist, a new window is created.
+    @code{.cpp}
     /// Access window via its name
-    viz::Viz3d sameWindow = viz::getWindowByName("Viz Demo");
-
-    /// Start event loop
-    sameWindow.spin();
-
-    /// Event loop is over when pressed q, Q, e, E
-    cout << "Second event loop is over" << endl;
-
+    viz::Viz3d sameWindow = viz::get("Viz Demo");
+    @endcode
+-   Start a controlled event loop. Once it starts, **wasStopped** is set to false. Inside the while
+    loop, in each iteration, **spinOnce** is called to prevent event loop from completely stopping.
+    Inside the while loop, user can execute other statements including those which interact with the
+    window.
+    @code{.cpp}
     /// Event loop is over when pressed q, Q, e, E
     /// Start event loop once for 1 millisecond
     sameWindow.spinOnce(1, true);
@@ -55,54 +54,11 @@ int main()
         /// Event loop for 1 millisecond
         sameWindow.spinOnce(1, true);
     }
+    @endcode
 
-    /// Once more event loop is stopped
-    cout << "Last event loop is over" << endl;
-    return 0;
-}
-@endcode
-Explanation
------------
-
-Here is the general structure of the program:
-
--   Create a window.
-@code{.cpp}
-/// Create a window
-viz::Viz3d myWindow("Viz Demo");
-@endcode
--   Start event loop. This event loop will run until user terminates it by pressing **e**, **E**,
-    **q**, **Q**.
-@code{.cpp}
-/// Start event loop
-myWindow.spin();
-@endcode
--   Access same window via its name. Since windows are implicitly shared, **sameWindow** is exactly
-    the same with **myWindow**. If the name does not exist, a new window is created.
-@code{.cpp}
-/// Access window via its name
-viz::Viz3d sameWindow = viz::get("Viz Demo");
-@endcode
--   Start a controlled event loop. Once it starts, **wasStopped** is set to false. Inside the while
-    loop, in each iteration, **spinOnce** is called to prevent event loop from completely stopping.
-    Inside the while loop, user can execute other statements including those which interact with the
-    window.
-@code{.cpp}
-/// Event loop is over when pressed q, Q, e, E
-/// Start event loop once for 1 millisecond
-sameWindow.spinOnce(1, true);
-while(!sameWindow.wasStopped())
-{
-    /// Interact with window
-
-    /// Event loop for 1 millisecond
-    sameWindow.spinOnce(1, true);
-}
-@endcode
 Results
 -------
 
 Here is the result of the program.
 
-![image](images/window_demo.png)
-
+![](images/window_demo.png)