tests/geometry/region.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        tests/geometry/region.cpp
   3 // Purpose:     wxRegion unit test
   4 // Author:      Vadim Zeitlin
   5 // Created:     2011-10-12
   6 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
   7 ///////////////////////////////////////////////////////////////////////////////
   8
   9 // ----------------------------------------------------------------------------
  10 // headers
  11 // ----------------------------------------------------------------------------
  12
  13 #include "testprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/region.h"
  21 #endif // WX_PRECOMP
  22
  23 #include "wx/iosfwrap.h"
  24
  25 // ----------------------------------------------------------------------------
  26 // helper functions
  27 // ----------------------------------------------------------------------------
  28
  29 namespace
  30 {
  31
  32 // This function could be easily added to wxRegionIterator itself, where it
  33 // could be implemented far more efficiently as all major platforms store the
  34 // number of rectangles anyhow, but as we only use it for debugging purposes,
  35 // just keep it here for now.
  36 unsigned GetRectsCount(const wxRegion& rgn)
  37 {
  38     unsigned count = 0;
  39     for ( wxRegionIterator iter(rgn); iter.HaveRects(); ++iter )
  40         count++;
  41     return count;
  42 }
  43
  44 } // anonymous namespace
  45
  46 // this operator is needed to use CPPUNIT_ASSERT_EQUAL with wxRegions
  47 std::ostream& operator<<(std::ostream& os, const wxRegion& rgn)
  48 {
  49     wxRect r = rgn.GetBox();
  50     os << "# rects = " << GetRectsCount(rgn)
  51        << "; bounding box {"
  52        << r.x << ", " << r.y << ", " << r.width << ", " << r.height
  53        << "}";
  54     return os;
  55 }
  56
  57 // ----------------------------------------------------------------------------
  58 // test class
  59 // ----------------------------------------------------------------------------
  60
  61 class RegionTestCase : public CppUnit::TestCase
  62 {
  63 public:
  64     RegionTestCase() { }
  65
  66 private:
  67     CPPUNIT_TEST_SUITE( RegionTestCase );
  68         CPPUNIT_TEST( Validity );
  69         CPPUNIT_TEST( Intersect );
  70     CPPUNIT_TEST_SUITE_END();
  71
  72     void Validity();
  73     void Intersect();
  74
  75     wxDECLARE_NO_COPY_CLASS(RegionTestCase);
  76 };
  77
  78 // register in the unnamed registry so that these tests are run by default
  79 CPPUNIT_TEST_SUITE_REGISTRATION( RegionTestCase );
  80
  81 // also include in its own registry so that these tests can be run alone
  82 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( RegionTestCase, "RegionTestCase" );
  83
  84 void RegionTestCase::Validity()
  85 {
  86     wxRegion r;
  87
  88     CPPUNIT_ASSERT_MESSAGE
  89     (
  90         "Default constructed region must be invalid",
  91         !r.IsOk()
  92     );
  93
  94     CPPUNIT_ASSERT_MESSAGE
  95     (
  96         "Invalid region should be empty",
  97         r.IsEmpty()
  98     );
  99
 100     // Offsetting an invalid region doesn't make sense.
 101     WX_ASSERT_FAILS_WITH_ASSERT( r.Offset(1, 1) );
 102
 103     CPPUNIT_ASSERT_MESSAGE
 104     (
 105         "Combining with a valid region should create a valid region",
 106         r.Union(0, 0, 10, 10)
 107     );
 108
 109     CPPUNIT_ASSERT_EQUAL_MESSAGE
 110     (
 111         "Union() with invalid region should give the same region",
 112         wxRegion(0, 0, 10, 10),
 113         r
 114     );
 115 }
 116
 117 void RegionTestCase::Intersect()
 118 {
 119     const wxPoint points1[] = {
 120         wxPoint(310, 392),
 121         wxPoint(270, 392),
 122         wxPoint(270, 421),
 123         wxPoint(310, 421)
 124     };
 125
 126     wxRegion region1(WXSIZEOF(points1), points1);
 127
 128     const wxPoint points2[] = {
 129         wxPoint(54, 104),
 130         wxPoint(85,  82),
 131         wxPoint(68,  58),
 132         wxPoint(37,  80)
 133     };
 134
 135     wxRegion region2(4,points2);
 136
 137     CPPUNIT_ASSERT( region1.Intersect(region2) );
 138     CPPUNIT_ASSERT( region1.IsEmpty() );
 139 }