basegfx/test/B2DPolyPolygonTest.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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  12  *   contributor license agreements. See the NOTICE file distributed
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <cppunit/TestAssert.h>
  21 #include <cppunit/TestFixture.h>
  22 #include <cppunit/extensions/HelperMacros.h>
  23
  24 #include <basegfx/polygon/b2dpolypolygon.hxx>
  25 #include <basegfx/polygon/b2dtrapezoid.hxx>
  26
  27 #include "boxclipper.hxx"
  28 #include <random>
  29
  30 namespace basegfx
  31 {
  32 class b2dpolypolygon : public CppUnit::TestFixture
  33 {
  34 public:
  35     // insert your test code here.
  36     void testTrapezoidHelper()
  37     {
  38         B2DPolygon aPolygon;
  39         // provoke the PointBlockAllocator to exercise the freeIfLast path
  40         for (int i = 0; i < 16 * 10; i++)
  41         {
  42             B2DPoint aPoint(getRandomOrdinal(1000), getRandomOrdinal(1000));
  43             aPolygon.append(aPoint);
  44         }
  45         // scatter some duplicate points in to stress things more.
  46         for (int i = 0; i < 16 * 10; i++)
  47         {
  48             aPolygon.insert(getRandomOrdinal(aPolygon.count() - 1),
  49                             aPolygon.getB2DPoint(getRandomOrdinal(aPolygon.count() - 1)));
  50         }
  51         B2DPolygon aPolygonOffset;
  52         // duplicate the polygon and offset it slightly.
  53         for (size_t i = 0; i < aPolygon.count(); i++)
  54         {
  55             B2DPoint aPoint(aPolygon.getB2DPoint(i));
  56             aPoint += B2DPoint(0.5 - getRandomOrdinal(1), 0.5 - getRandomOrdinal(1));
  57             aPolygonOffset.append(aPoint);
  58         }
  59         B2DPolyPolygon aPolyPolygon;
  60         aPolyPolygon.append(aPolygon);
  61         aPolyPolygon.append(aPolygonOffset);
  62         B2DTrapezoidVector aVector;
  63         basegfx::utils::trapezoidSubdivide(aVector, aPolyPolygon);
  64         CPPUNIT_ASSERT_MESSAGE("more than zero sub-divided trapezoids", !aVector.empty());
  65     }
  66
  67     std::mt19937 rng; // Standard mersenne_twister_engine
  68
  69     /// Gets a random ordinal [0,n)
  70     ::std::size_t getRandomOrdinal(const ::std::size_t n)
  71     {
  72         std::uniform_int_distribution<size_t> dist(0, n - 1);
  73         return dist(rng);
  74     }
  75
  76     // Change the following lines only, if you add, remove or rename
  77     // member functions of the current class,
  78     // because these macros are need by auto register mechanism.
  79
  80     CPPUNIT_TEST_SUITE(b2dpolypolygon);
  81     CPPUNIT_TEST(testTrapezoidHelper);
  82     CPPUNIT_TEST_SUITE_END();
  83 }; // class b2dpolypolygon
  84
  85 } // namespace basegfx
  86
  87 CPPUNIT_TEST_SUITE_REGISTRATION(basegfx::b2dpolypolygon);
  88
  89 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */