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_SUITE_END();
  71
  72     void Validity();
  73
  74     wxDECLARE_NO_COPY_CLASS(RegionTestCase);
  75 };
  76
  77 // register in the unnamed registry so that these tests are run by default
  78 CPPUNIT_TEST_SUITE_REGISTRATION( RegionTestCase );
  79
  80 // also include in its own registry so that these tests can be run alone
  81 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( RegionTestCase, "RegionTestCase" );
  82
  83 void RegionTestCase::Validity()
  84 {
  85     wxRegion r;
  86
  87     CPPUNIT_ASSERT_MESSAGE
  88     (
  89         "Default constructed region must be invalid",
  90         !r.IsOk()
  91     );
  92
  93     CPPUNIT_ASSERT_MESSAGE
  94     (
  95         "Invalid region should be empty",
  96         r.IsEmpty()
  97     );
  98
  99     // Offsetting an invalid region doesn't make sense.
 100     WX_ASSERT_FAILS_WITH_ASSERT( r.Offset(1, 1) );
 101
 102     CPPUNIT_ASSERT_MESSAGE
 103     (
 104         "Combining with a valid region should create a valid region",
 105         r.Union(0, 0, 10, 10)
 106     );
 107
 108     CPPUNIT_ASSERT_EQUAL_MESSAGE
 109     (
 110         "Union() with invalid region should give the same region",
 111         wxRegion(0, 0, 10, 10),
 112         r
 113     );
 114 }