From 3a544c0ef0942c52ea18e26dc1f015a0fef60253 Mon Sep 17 00:00:00 2001
From: Kaitlyn Lee <kdl222@nau.edu>
Date: Wed, 27 Mar 2019 10:58:28 -0700
Subject: [PATCH] Added AffineTests (#3166)

---
 isis/tests/AffineTests.cpp | 169 +++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 isis/tests/AffineTests.cpp

diff --git a/isis/tests/AffineTests.cpp b/isis/tests/AffineTests.cpp
new file mode 100644
index 0000000000..46b7ed6188
--- /dev/null
+++ b/isis/tests/AffineTests.cpp
@@ -0,0 +1,169 @@
+#include "Affine.h"
+#include "IException.h"
+#include "TestUtilities.h"
+
+#include <gtest/gtest.h>
+#include <QString>
+
+TEST(Affine, DefaultConstructor) {
+  Isis::Affine affine;
+  EXPECT_EQ(affine.xp(), 0);
+  EXPECT_EQ(affine.yp(), 0);
+  EXPECT_EQ(affine.x(), 0);
+  EXPECT_EQ(affine.y(), 0);
+}
+
+
+TEST(Affine, MatrixConstructor) {
+  Isis::Affine::AMatrix matrix(3, 3, 0.0);
+  matrix[0][0] = 1.0;
+  matrix[1][1] = 1.0;
+  matrix[2][2] = 1.0;
+  Isis::Affine affine(matrix);
+  EXPECT_EQ(affine.xp(), 0);
+  EXPECT_EQ(affine.yp(), 0);
+  EXPECT_EQ(affine.x(), 0);
+  EXPECT_EQ(affine.y(), 0);
+}
+
+
+TEST(Affine, IncorrectDimensions) {
+  QString message = "Affine matrices must be 3x3";
+  try {
+    Isis::Affine::AMatrix matrix(2, 2, 0.0);
+    matrix[0][0] = 1.0;
+    matrix[1][1] = 1.0;
+    Isis::Affine affine(matrix);
+  }
+  catch(Isis::IException &e) {
+    EXPECT_PRED_FORMAT2(Isis::AssertIExceptionMessage, e, message);
+  }
+  catch(...) {
+    FAIL() << "Expected error message: \"" << message.toStdString() << "\"";
+  }
+}
+
+
+TEST(Affine, NotInvertible) {
+  QString message = "Affine transform not invertible";
+  try {
+    Isis::Affine::AMatrix matrix(3, 3, 1.0);
+    Isis::Affine affine(matrix);
+  }
+  catch(Isis::IException &e) {
+    EXPECT_PRED_FORMAT2(Isis::AssertIExceptionMessage, e, message);
+  }
+  catch(...) {
+    FAIL() << "Expected error message: \"" << message.toStdString() << "\"";
+  }
+}
+
+
+TEST(Affine, Identity) {
+  Isis::Affine affine;
+  Isis::Affine::AMatrix identity = affine.getIdentity();
+  EXPECT_EQ(identity[0][0], 1);
+  EXPECT_EQ(identity[0][1], 0);
+  EXPECT_EQ(identity[0][2], 0);
+  EXPECT_EQ(identity[1][0], 0);
+  EXPECT_EQ(identity[1][1], 1);
+  EXPECT_EQ(identity[1][2], 0);
+  EXPECT_EQ(identity[2][0], 0);
+  EXPECT_EQ(identity[2][1], 0);
+  EXPECT_EQ(identity[2][2], 1);
+}
+
+
+// Solve (1,1)->(3,3) (3,3)->(1,1), (1,3)->(3,1)
+TEST(Affine, Solve) {
+  Isis::Affine affine;
+  double x[] = { 1.0, 3.0, 1.0 };
+  double y[] = { 1.0, 3.0, 3.0 };
+  double xp[] = { 3.0, 1.0, 3.0 };
+  double yp[] = { 3.0, 1.0, 1.0 };
+  affine.Solve(x, y, xp, yp, 3);
+  
+  affine.Compute(1.0, 1.0);
+  EXPECT_NEAR(affine.xp(), 3.0, .00000000001);
+  EXPECT_NEAR(affine.yp(), 3.0, .00000000001);
+
+  affine.Compute(3.0, 3.0);
+  EXPECT_NEAR(affine.xp(), 1.0, .00000000001);
+  EXPECT_NEAR(affine.yp(), 1.0, .00000000001);
+
+  affine.Compute(1.0, 3.0);
+  EXPECT_NEAR(affine.xp(), 3.0, .00000000001);
+  EXPECT_NEAR(affine.yp(), 1.0, .00000000001);
+
+  affine.Compute(3.0, 1.0);
+  EXPECT_NEAR(affine.xp(), 1.0, .00000000001);
+  EXPECT_NEAR(affine.yp(), 3.0, .00000000001);
+}
+
+
+TEST(Affine, Compute) {
+  Isis::Affine affine;
+  affine.Compute(1.0, 1.0);
+  EXPECT_DOUBLE_EQ(affine.xp(), 1.0);
+  EXPECT_DOUBLE_EQ(affine.yp(), 1.0);
+  affine.ComputeInverse(affine.xp(), affine.yp());
+  EXPECT_DOUBLE_EQ(affine.x(), 1.0);
+  EXPECT_DOUBLE_EQ(affine.y(), 1.0);
+}
+
+
+TEST(Affine, Translate) {
+  Isis::Affine affine;
+  affine.Translate(1.0, -1.0);
+  affine.Compute(0.0, 0.0);
+  EXPECT_DOUBLE_EQ(affine.xp(), 1.0);
+  EXPECT_DOUBLE_EQ(affine.yp(), -1.0);
+}
+
+
+TEST(Affine, Rotate) {
+  Isis::Affine affine;
+  affine.Rotate(90.0);
+  affine.Compute(1.0, 1.0);
+  EXPECT_DOUBLE_EQ(affine.xp(), -1.0);
+  EXPECT_DOUBLE_EQ(affine.yp(), 1.0);
+}
+
+
+TEST(Affine, Scale) {
+  Isis::Affine affine;
+  affine.Scale(2.0);
+  affine.Compute(1.0, 1.0);
+  EXPECT_DOUBLE_EQ(affine.xp(), 2.0);
+  EXPECT_DOUBLE_EQ(affine.yp(), 2.0);
+}
+
+
+TEST(Affine, Coefficients) {
+  Isis::Affine affine;
+  std::vector<double> xcoef = affine.Coefficients(1);
+  EXPECT_DOUBLE_EQ(xcoef[0], 1.0);
+  EXPECT_DOUBLE_EQ(xcoef[1], 0);
+  EXPECT_DOUBLE_EQ(xcoef[2], 0);
+  std::vector<double> ycoef = affine.Coefficients(2);
+  EXPECT_DOUBLE_EQ(ycoef[0], 0);
+  EXPECT_DOUBLE_EQ(ycoef[1], 1.0);
+  EXPECT_DOUBLE_EQ(ycoef[2], 0);
+}
+
+
+TEST(Affine, InverseCoefficients) {
+  Isis::Affine::AMatrix matrix(3, 3, 0.0);
+  matrix[0][0] = 2.0;
+  matrix[1][1] = 1.0;
+  matrix[2][2] = 1.0;
+  Isis::Affine affine(matrix);  
+  std::vector<double> xcoef = affine.InverseCoefficients(1);
+  EXPECT_DOUBLE_EQ(xcoef[0], 1.0/2.0);
+  EXPECT_DOUBLE_EQ(xcoef[1], 0);
+  EXPECT_DOUBLE_EQ(xcoef[2], 0);
+  std::vector<double> ycoef = affine.InverseCoefficients(2);
+  EXPECT_DOUBLE_EQ(ycoef[0], 0);
+  EXPECT_DOUBLE_EQ(ycoef[1], 1.0);
+  EXPECT_DOUBLE_EQ(ycoef[2], 0);
+}
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