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 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ----------------------------------------------------------------------------
  11 // headers
  12 // ----------------------------------------------------------------------------
  13
  14 #include "testprec.h"
  15
  16 #ifdef __BORLANDC__
  17     #pragma hdrstop
  18 #endif
  19
  20 #ifndef WX_PRECOMP
  21     #include "wx/region.h"
  22 #endif // WX_PRECOMP
  23
  24 #include "wx/iosfwrap.h"
  25
  26 // ----------------------------------------------------------------------------
  27 // helper functions
  28 // ----------------------------------------------------------------------------
  29
  30 namespace
  31 {
  32
  33 // This function could be easily added to wxRegionIterator itself, where it
  34 // could be implemented far more efficiently as all major platforms store the
  35 // number of rectangles anyhow, but as we only use it for debugging purposes,
  36 // just keep it here for now.
  37 unsigned GetRectsCount(const wxRegion& rgn)
  38 {
  39     unsigned count = 0;
  40     for ( wxRegionIterator iter(rgn); iter.HaveRects(); ++iter )
  41         count++;
  42     return count;
  43 }
  44
  45 } // anonymous namespace
  46
  47 // this operator is needed to use CPPUNIT_ASSERT_EQUAL with wxRegions
  48 std::ostream& operator<<(std::ostream& os, const wxRegion& rgn)
  49 {
  50     wxRect r = rgn.GetBox();
  51     os << "# rects = " << GetRectsCount(rgn)
  52        << "; bounding box {"
  53        << r.x << ", " << r.y << ", " << r.width << ", " << r.height
  54        << "}";
  55     return os;
  56 }
  57
  58 // ----------------------------------------------------------------------------
  59 // test class
  60 // ----------------------------------------------------------------------------
  61
  62 class RegionTestCase : public CppUnit::TestCase
  63 {
  64 public:
  65     RegionTestCase() { }
  66
  67 private:
  68     CPPUNIT_TEST_SUITE( RegionTestCase );
  69         CPPUNIT_TEST( Validity );
  70         CPPUNIT_TEST( Intersect );
  71     CPPUNIT_TEST_SUITE_END();
  72
  73     void Validity();
  74     void Intersect();
  75
  76     wxDECLARE_NO_COPY_CLASS(RegionTestCase);
  77 };
  78
  79 // register in the unnamed registry so that these tests are run by default
  80 CPPUNIT_TEST_SUITE_REGISTRATION( RegionTestCase );
  81
  82 // also include in its own registry so that these tests can be run alone
  83 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( RegionTestCase, "RegionTestCase" );
  84
  85 void RegionTestCase::Validity()
  86 {
  87     wxRegion r;
  88
  89     CPPUNIT_ASSERT_MESSAGE
  90     (
  91         "Default constructed region must be invalid",
  92         !r.IsOk()
  93     );
  94
  95     CPPUNIT_ASSERT_MESSAGE
  96     (
  97         "Invalid region should be empty",
  98         r.IsEmpty()
  99     );
 100
 101     // Offsetting an invalid region doesn't make sense.
 102     WX_ASSERT_FAILS_WITH_ASSERT( r.Offset(1, 1) );
 103
 104     CPPUNIT_ASSERT_MESSAGE
 105     (
 106         "Combining with a valid region should create a valid region",
 107         r.Union(0, 0, 10, 10)
 108     );
 109
 110     CPPUNIT_ASSERT_EQUAL_MESSAGE
 111     (
 112         "Union() with invalid region should give the same region",
 113         wxRegion(0, 0, 10, 10),
 114         r
 115     );
 116 }
 117
 118 void RegionTestCase::Intersect()
 119 {
 120     const wxPoint points1[] = {
 121         wxPoint(310, 392),
 122         wxPoint(270, 392),
 123         wxPoint(270, 421),
 124         wxPoint(310, 421)
 125     };
 126
 127     wxRegion region1(WXSIZEOF(points1), points1);
 128
 129     const wxPoint points2[] = {
 130         wxPoint(54, 104),
 131         wxPoint(85,  82),
 132         wxPoint(68,  58),
 133         wxPoint(37,  80)
 134     };
 135
 136     wxRegion region2(4,points2);
 137
 138     CPPUNIT_ASSERT( region1.Intersect(region2) );
 139     CPPUNIT_ASSERT( region1.IsEmpty() );
 140 }