Working on groups

tests/group_test.cpp

@@ -0,0 +1,82 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Group unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <intersect.h>
+#include <intersection.h>
+#include <group.h>
+#include <testshape.h>
+#include <sphere.h>
+
+#include <transformation.h>
+#include <gtest/gtest.h>
+
+TEST(GroupTest, Creating_a_new_group)
+{
+    Group g = Group();
+
+    ASSERT_EQ(g.transformMatrix, Matrix4().identity());
+    ASSERT_TRUE(g.isEmpty());
+}
+
+TEST(GroupTest, Adding_a_child_to_a_group)
+{
+    Group g = Group();
+    TestShape s = TestShape();
+
+    g.addObject(&s);
+
+    ASSERT_FALSE(g.isEmpty());
+    ASSERT_EQ(s.parent, &g);
+    ASSERT_EQ(g[0], &s);
+}
+
+TEST(GroupTest, Intersecting_a_ray_with_an_empty_group)
+{
+    Group g = Group();
+    Ray r = Ray(Point(0, 0, 0), Vector(0, 0, 1));
+    Intersect xs = g.intersect(r);
+    ASSERT_EQ(xs.count(), 0);
+}
+
+TEST(GroupTest, Intersecting_a_ray_with_an_nonempty_group)
+{
+    Group g = Group();
+    Sphere s1 = Sphere();
+    Sphere s2 = Sphere();
+    Sphere s3 = Sphere();
+
+    s2.setTransform(translation(0, 0, -3));
+    s3.setTransform(translation(5, 0, 0));
+
+    g.addObject(&s1);
+    g.addObject(&s2);
+    g.addObject(&s3);
+
+    Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
+    Intersect xs = g.intersect(r);
+    ASSERT_EQ(xs.count(), 4);
+    EXPECT_EQ(xs[0].object, &s2);
+    EXPECT_EQ(xs[1].object, &s2);
+    EXPECT_EQ(xs[2].object, &s1);
+    EXPECT_EQ(xs[3].object, &s1);
+}
+
+TEST(GroupTest, Intersecting_a_transformer_group)
+{
+    Group g = Group();
+    Sphere s = Sphere();
+
+    g.setTransform(scaling(2, 2, 2));
+    s.setTransform(translation(5, 0, 0));
+
+    g.addObject(&s);
+
+    Ray r = Ray(Point(10, 0, -50), Vector(0, 0, 1));
+    Intersect xs = g.intersect(r);
+    ASSERT_EQ(xs.count(), 2);
+}