add unit tests support

you need cxxtest or they will be skipped
one bug found using those tests!

.gitignore

@@ -19,5 +19,9 @@ compile_commands.json
 CTestTestfile.cmake
 /build/
 
+# generated code (unit tests)
+Test*.cpp
+
 # executables
 /lines
+unittest_*

CMakeLists.txt

@@ -36,6 +36,18 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DHAS_OPENCV3")
 endif (OpenCV_VERSION VERSION_LESS "3.0")
 
+#CxxTest
+find_package(CxxTest)
+if(CXXTEST_FOUND)
+    include_directories(${CXXTEST_INCLUDE_DIR})
+    enable_testing()
+    CXXTEST_ADD_TEST(unittest_changecoord TestChangeCoord.cpp ${CMAKE_CURRENT_SOURCE_DIR}/TestChangeCoord.h
+        geometry.cpp)
+    target_link_libraries(unittest_changecoord ${OpenCV_LIBS})
+else()
+    message(STATUS "Warning: Can't find CxxTest; testing will be disabled")
+endif()
+
 add_executable( lines lines.cpp geometry.cpp cvutils.cpp)
 target_link_libraries( lines ${OpenCV_LIBS} )
 

TestChangeCoord.h

@@ -0,0 +1,48 @@
+#include <math.h>
+
+#ifdef HAS_OPENCV3
+#include <opencv2/core.hpp> //Any OPENCV3 code
+#else
+#include <opencv2/core/core.hpp> //Any Opencv2 code
+#endif
+using namespace cv;
+#include <cxxtest/TestSuite.h>
+
+#include "geometry.h"
+
+class TestChangeCoord : public CxxTest::TestSuite
+{
+    public:
+        void testOrigin(void)
+        {
+            Point origin = Point(1,2);
+            //the angle here is actually irrelevant
+            Point p = map_point(M_PI/2, origin, origin);
+            TS_ASSERT_EQUALS(p.x, 0);
+            TS_ASSERT_EQUALS(p.y, 0);
+        }
+
+        void testOnlyTranslation(void)
+        {
+            Point origin = Point(1,2);
+            Point p = map_point(0, origin, Point(0,0));
+            TS_ASSERT_EQUALS(p.x, -1);
+            TS_ASSERT_EQUALS(p.y, -2);
+        }
+
+        void testOnlyRotationOrigin(void)
+        {
+            Point origin = Point(0,0);
+            Point p = map_point(M_PI, origin, origin);
+            TS_ASSERT_EQUALS(p.x, 0);
+            TS_ASSERT_EQUALS(p.y, 0);
+        }
+
+        void testOnlyRotation(void)
+        {
+            Point origin = Point(0,0);
+            Point p = map_point(M_PI, origin, Point(1,2));
+            TS_ASSERT_EQUALS(p.x, -1);
+            TS_ASSERT_EQUALS(p.y, -2);
+        }
+};

geometry.cpp

@@ -1,3 +1,5 @@
+#include <iostream>
+
 #ifdef HAS_OPENCV3
 #include <opencv2/core.hpp> //Any OPENCV3 code
 #else
@@ -24,19 +26,16 @@ map_point(double theta, cv::Point origin, cv::Point tomap)
 	//that's the algorithm: res = Rt*(tomap - origin)
 	cv::Vec<double,2> p_as_vector;
 	cv::Point p;
-	cv::Point res;
 	cv::Matx<double,2,2> Rt;
 
 	p = tomap - origin;
 	p_as_vector[0] = p.x;
 	p_as_vector[1] = p.y;
-	//TODO: fai matrice
+
 	Rt(0,0) = cos(theta);
 	Rt(0,1) = sin(theta);
 	Rt(1,1) = Rt(0,0);
 	Rt(1,0) = -Rt(0,1);
 	cv::Vec<double,2> res_as_vector = Rt*p_as_vector;
-	res.x = res_as_vector[0];
-	res.y = res_as_vector[1];
-	return res;
+    return cv::Point(res_as_vector);
 }