From 5ba211579142c460139a70f47756a21471216a78 Mon Sep 17 00:00:00 2001
From: Roman Sorokin <sorok-roma@yandex.ru>
Date: Tue, 29 Jul 2014 11:30:13 +0300
Subject: [PATCH] tests for Spline::iterator

---
 geometry/geometry_tests/spline_test.cpp | 193 ++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 geometry/geometry_tests/spline_test.cpp

diff --git a/geometry/geometry_tests/spline_test.cpp b/geometry/geometry_tests/spline_test.cpp
new file mode 100644
index 0000000000..ac0d5a0dea
--- /dev/null
+++ b/geometry/geometry_tests/spline_test.cpp
@@ -0,0 +1,193 @@
+#include "../../base/SRC_FIRST.hpp"
+#include "../../testing/testing.hpp"
+#include "equality.hpp"
+#include "../spline.hpp"
+
+using m2::Spline;
+using m2::PointF;
+
+void TestPointFDir(PointF const & dst, PointF const & src)
+{
+  float len1 = dst.Length();
+  float len2 = src.Length();
+  TEST_ALMOST_EQUAL(dst.x/len1, src.x/len2, ());
+  TEST_ALMOST_EQUAL(dst.y/len1, src.y/len2, ());
+}
+
+UNIT_TEST(SmoothedDirections)
+{
+  vector<PointF> path;
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 0));
+
+  Spline spl;
+  spl.FromArray(path);
+  float const sqrt2 = sqrtf(2.0f);
+  Spline::iterator itr;
+  PointF dir1(sqrt2 / 2.0f, sqrt2 / 2.0f);
+  PointF dir2(sqrt2 / 2.0f, -sqrt2 / 2.0f);
+  itr.Attach(spl);
+  TestPointFDir(itr.m_avrDir, dir1);
+  itr.Step(sqrt2 * 30.0f);
+  TestPointFDir(itr.m_avrDir, dir1);
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_avrDir, dir1 * 0.25f + dir2 * 0.75f);
+  itr.Step(sqrt2 * 10.0f);
+  TestPointFDir(itr.m_avrDir, dir2);
+
+  path.clear();
+
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 40));
+  path.push_back(PointF(120, 0));
+
+  PointF dir12(1.0f, 0.0f);
+  Spline spl2;
+  spl2.FromArray(path);
+  itr.Attach(spl2);
+  TestPointFDir(itr.m_avrDir, dir1);
+  itr.Step(sqrt2 * 80.0f + 40.0f);
+  TestPointFDir(itr.m_avrDir, dir12);
+  itr.Attach(spl2);
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_avrDir, dir1);
+  itr.Step(80.0f);
+  TestPointFDir(itr.m_avrDir, dir12 * 0.5f + dir2 * 0.5f);
+}
+
+UNIT_TEST(UsualDirections)
+{
+  vector<PointF> path;
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 0));
+
+  Spline spl;
+  spl.FromArray(path);
+  float const sqrt2 = sqrtf(2.0f);
+  Spline::iterator itr;
+  PointF dir1(sqrt2 / 2.0f, sqrt2 / 2.0f);
+  PointF dir2(sqrt2 / 2.0f, -sqrt2 / 2.0f);
+  itr.Attach(spl);
+  TestPointFDir(itr.m_dir, dir1);
+  itr.Step(sqrt2 * 30.0f);
+  TestPointFDir(itr.m_dir, dir1);
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_dir, dir2);
+
+  path.clear();
+
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 40));
+  path.push_back(PointF(120, 0));
+
+  PointF dir12(1.0f, 0.0f);
+  Spline spl2;
+  spl2.FromArray(path);
+  itr.Attach(spl2);
+  TestPointFDir(itr.m_dir, dir1);
+  itr.Step(sqrt2 * 80.0f + 35.0f);
+  TestPointFDir(itr.m_dir, dir2);
+  itr.Attach(spl2);
+  itr.Step(sqrt2 * 45.0f);
+  TestPointFDir(itr.m_dir, dir12);
+  itr.Step(80.0f);
+  TestPointFDir(itr.m_dir, dir2);
+}
+
+UNIT_TEST(Positions)
+{
+  vector<PointF> path;
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 0));
+
+  Spline spl;
+  Spline spl0;
+  Spline spl4;
+  spl.FromArray(path);
+  spl0 = spl4 = spl;
+  float const sqrt2 = sqrtf(2.0f);
+  Spline::iterator itr;
+  itr.Attach(spl0);
+  TestPointFDir(itr.m_pos, PointF(0, 0));
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_pos, PointF(40, 40));
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_pos, PointF(80, 0));
+  itr.Attach(spl4);
+  TestPointFDir(itr.m_pos, PointF(0, 0));
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_pos, PointF(40, 40));
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_pos, PointF(80, 0));
+
+  path.clear();
+
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 40));
+  path.push_back(PointF(120, 0));
+
+  Spline spl2;
+  spl2.FromArray(path);
+  Spline spl3 = spl2;
+  itr.Attach(spl3);
+  TestPointFDir(itr.m_pos, PointF(0, 0));
+  itr.Step(sqrt2 * 80.0f + 40.0f);
+  TestPointFDir(itr.m_pos, PointF(120, 0));
+  itr.Attach(spl2);
+  itr.Step(sqrt2 * 40.0f);
+  TestPointFDir(itr.m_pos, PointF(40, 40));
+  itr.Step(2.0f);
+  TestPointFDir(itr.m_pos, PointF(42, 40));
+  itr.Step(20.0f);
+  TestPointFDir(itr.m_pos, PointF(62, 40));
+  itr.Step(18.0f);
+  TestPointFDir(itr.m_pos, PointF(80, 40));
+}
+
+UNIT_TEST(BeginAgain)
+{
+  vector<PointF> path;
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 0));
+
+  Spline spl;
+  spl.FromArray(path);
+  float const sqrt2 = sqrtf(2.0f);
+  Spline::iterator itr;
+  PointF dir1(sqrt2 / 2.0f, sqrt2 / 2.0f);
+  PointF dir2(sqrt2 / 2.0f, -sqrt2 / 2.0f);
+  itr.Attach(spl);
+  TEST_EQUAL(itr.beginAgain(), false, ());
+  itr.Step(90.0f);
+  TEST_EQUAL(itr.beginAgain(), false, ());
+  itr.Step(90.0f);
+  TEST_EQUAL(itr.beginAgain(), true, ());
+  itr.Step(190.0f);
+  TEST_EQUAL(itr.beginAgain(), true, ());
+
+  path.clear();
+
+  path.push_back(PointF(0, 0));
+  path.push_back(PointF(40, 40));
+  path.push_back(PointF(80, 40));
+  path.push_back(PointF(120, 0));
+
+  Spline spl2;
+  spl2.FromArray(path);
+  itr.Attach(spl2);
+  TEST_EQUAL(itr.beginAgain(), false, ());
+  itr.Step(90.0f);
+  TEST_EQUAL(itr.beginAgain(), false, ());
+  itr.Step(90.0f);
+  TEST_EQUAL(itr.beginAgain(), true, ());
+  itr.Step(190.0f);
+  TEST_EQUAL(itr.beginAgain(), true, ());
+}
+