[WIP] Add Camera

tests/07_making_scene.cpp

@@ -503,3 +503,69 @@ SCENARIO("An arbitrary view transformation", "[features/transformations.feature]
         }
     }
 }
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("Constructing a camera", "[features/camera.feature]")
+{
+    GIVEN("hsize <- 160")
+    {
+        uint16_t hsize = 160;
+        AND_GIVEN("vsize <- 120")
+        {
+            uint16_t vsize = 120;
+            AND_GIVEN("field_of_view <- pi / 2")
+            {
+                double field_of_view = std::numbers::pi / 2;
+                WHEN("c <- camera(hsize, vsize,field_of_view)")
+                {
+                    Camera c(hsize, vsize, field_of_view);
+                    THEN("c.hsize = 160")
+                    {
+                        REQUIRE(c.hsize() == 160);
+                    }
+                    AND_THEN("c.vsize = 120")
+                    {
+                        REQUIRE(c.vsize() == 120);
+                    }
+                    AND_THEN("c.field_of_view = pi / 2")
+                    {
+                        REQUIRE(c.field_of_view() == std::numbers::pi / 2);
+                    }
+                    AND_THEN("c.transform = identity_matrix")
+                    {
+                        REQUIRE(c.transform() == Matrix::identity());
+                    }
+                }
+            }
+        }
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("The pixel size for a horizontal canvas", "[features/camera.feature]")
+{
+    GIVEN("c <- camera(200, 125, pi/2)")
+    {
+        Camera c(200, 125, std::numbers::pi / 2);
+        THEN("c.pixel_size = 0.01")
+        {
+            REQUIRE(c.pixel_size() == 0.01);
+        }
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("The pixel size for a vertical canvas", "[features/camera.feature]")
+{
+    GIVEN("c <- camera(125, 200, pi/2)")
+    {
+        Camera c(125, 200, std::numbers::pi / 2);
+        THEN("c.pixel_size = 0.01")
+        {
+            REQUIRE(c.pixel_size() == 0.01);
+        }
+    }
+}