tests/geometry/rect.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        tests/geometry/rect.cpp
   3 // Purpose:     wxRect unit test
   4 // Author:      Vadim Zeitlin
   5 // Created:     2004-12-11
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2004 wxWindows
   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/gdicmn.h"
  22 #endif // WX_PRECOMP
  23
  24 #include "wx/iosfwrap.h"
  25
  26 // ----------------------------------------------------------------------------
  27 // helper functions
  28 // ----------------------------------------------------------------------------
  29
  30 // this operator is needed to use CPPUNIT_ASSERT_EQUAL with wxRects
  31 wxSTD ostream& operator<<(wxSTD ostream& os, const wxRect& r)
  32 {
  33     os << "{"
  34         << r.x << ", " << r.y << ", " << r.width << ", " << r.height
  35        << "}";
  36     return os;
  37 }
  38
  39 // ----------------------------------------------------------------------------
  40 // test class
  41 // ----------------------------------------------------------------------------
  42
  43 class RectTestCase : public CppUnit::TestCase
  44 {
  45 public:
  46     RectTestCase() { }
  47
  48 private:
  49     CPPUNIT_TEST_SUITE( RectTestCase );
  50         CPPUNIT_TEST( CentreIn );
  51         CPPUNIT_TEST( InflateDeflate );
  52         CPPUNIT_TEST( Operators );
  53         CPPUNIT_TEST( Union );
  54     CPPUNIT_TEST_SUITE_END();
  55
  56     void CentreIn();
  57     void InflateDeflate();
  58     void Operators();
  59     void Union();
  60
  61     DECLARE_NO_COPY_CLASS(RectTestCase)
  62 };
  63
  64 // register in the unnamed registry so that these tests are run by default
  65 CPPUNIT_TEST_SUITE_REGISTRATION( RectTestCase );
  66
  67 // also include in it's own registry so that these tests can be run alone
  68 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( RectTestCase, "RectTestCase" );
  69
  70 void RectTestCase::CentreIn()
  71 {
  72     typedef wxRect R;
  73
  74     CPPUNIT_ASSERT_EQUAL( R(45, 45, 10, 10),
  75                           R(0, 0, 10, 10).CentreIn(R(0, 0, 100, 100)));
  76
  77     CPPUNIT_ASSERT_EQUAL( R(-5, -5, 20, 20),
  78                           R(0, 0, 20, 20).CentreIn(R(0, 0, 10, 10)));
  79 }
  80
  81 void RectTestCase::InflateDeflate()
  82 {
  83     // This is the rectangle from the example in the documentation of wxRect::Inflate().
  84     const wxRect r1(10, 10, 20, 40);
  85
  86     CPPUNIT_ASSERT(r1.Inflate( 10,  10)==wxRect(  0,   0, 40,  60));
  87     CPPUNIT_ASSERT(r1.Inflate( 20,  30)==wxRect(-10, -20, 60, 100));
  88     CPPUNIT_ASSERT(r1.Inflate(-10, -10)==wxRect( 20,  20,  0,  20));
  89     CPPUNIT_ASSERT(r1.Inflate(-15, -15)==wxRect( 20,  25,  0,  10));
  90
  91     CPPUNIT_ASSERT(r1.Inflate( 10,  10)==r1.Deflate(-10, -10));
  92     CPPUNIT_ASSERT(r1.Inflate( 20,  30)==r1.Deflate(-20, -30));
  93     CPPUNIT_ASSERT(r1.Inflate(-10, -10)==r1.Deflate( 10,  10));
  94     CPPUNIT_ASSERT(r1.Inflate(-15, -15)==r1.Deflate( 15,  15));
  95 }
  96
  97 void RectTestCase::Operators()
  98 {
  99     // test + operator which works like Union but does not ignore empty rectangles
 100     static const struct RectData
 101     {
 102         int x1, y1, w1, h1;
 103         int x2, y2, w2, h2;
 104         int x, y, w, h;
 105
 106         wxRect GetFirst() const { return wxRect(x1, y1, w1, h1); }
 107         wxRect GetSecond() const { return wxRect(x2, y2, w2, h2); }
 108         wxRect GetResult() const { return wxRect(x, y, w, h); }
 109     } s_rects[] =
 110     {
 111         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 112         { 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 2, 2 },
 113         { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
 114         { 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 4, 4 },
 115         { 1, 1, 2, 2, 4, 4, 1, 1, 1, 1, 4, 4 },
 116         { 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 6, 6 },
 117         { 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4 }
 118     };
 119
 120     for ( size_t n = 0; n < WXSIZEOF(s_rects); n++ )
 121     {
 122         const RectData& data = s_rects[n];
 123
 124         CPPUNIT_ASSERT(
 125             ( data.GetFirst() + data.GetSecond() ) == data.GetResult()
 126         );
 127
 128         CPPUNIT_ASSERT(
 129             ( data.GetSecond() + data.GetFirst() ) == data.GetResult()
 130         );
 131     }
 132
 133     // test operator*() which returns the intersection of two rectangles
 134     wxRect r1 = wxRect(0, 2, 3, 4);
 135     wxRect r2 = wxRect(1, 2, 7, 8);
 136     r1 *= r2;
 137     CPPUNIT_ASSERT(wxRect(1, 2, 2, 4) == r1);
 138
 139     CPPUNIT_ASSERT( (r1 * wxRect()).IsEmpty() );
 140 }
 141
 142 void RectTestCase::Union()
 143 {
 144     static const struct RectData
 145     {
 146         int x1, y1, w1, h1;
 147         int x2, y2, w2, h2;
 148         int x, y, w, h;
 149
 150         wxRect GetFirst() const { return wxRect(x1, y1, w1, h1); }
 151         wxRect GetSecond() const { return wxRect(x2, y2, w2, h2); }
 152         wxRect GetResult() const { return wxRect(x, y, w, h); }
 153     } s_rects[] =
 154     {
 155         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 156         { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 },
 157         { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
 158         { 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 4, 4 },
 159         { 1, 1, 2, 2, 4, 4, 1, 1, 1, 1, 4, 4 },
 160         { 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 6, 6 },
 161         { 1, 1, 4, 4, 4, 4, 1, 1, 1, 1, 4, 4 }
 162     };
 163
 164     for ( size_t n = 0; n < WXSIZEOF(s_rects); n++ )
 165     {
 166         const RectData& data = s_rects[n];
 167
 168         CPPUNIT_ASSERT(
 169             data.GetFirst().Union(data.GetSecond()) == data.GetResult()
 170         );
 171
 172         CPPUNIT_ASSERT(
 173             data.GetSecond().Union(data.GetFirst()) == data.GetResult()
 174         );
 175     }
 176 }