[FEAT]Add Canvas

tests/03_canvas.cpp

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+/*!
+ * 03_canvas.cpp
+ *
+ * Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ *
+ * @Author:  NADAL Jean-Baptiste
+ * @Date: 31/01/2024
+ *
+ */
+
+/*---------------------------------------------------------------------------*/
+
+#include <catch.hpp>
+
+#include "canvas.h"
+
+using namespace Raytracer;
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Canvas] Creating a canvas", "[Canvas]")
+{
+    Canvas c(10, 20);
+
+    REQUIRE(c.width() == 10);
+    REQUIRE(c.height() == 20);
+
+    for (int i = 0; i < 10; ++i)
+        for (int j = 0; j < 20; ++j)
+            REQUIRE(c.pixel_at(2, 3) == Color(0, 0, 0));
+}
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Canvas] Writing pixels to a canvas", "[Canvas]")
+{
+    Canvas c(10, 20);
+    Color red(1, 0, 0);
+
+    c.write_pixel(2, 3, red);
+
+    REQUIRE(c.pixel_at(2, 3) == red);
+}