added chess board example

Author: baderouaich

examples/chess_board.cpp

@@ -0,0 +1,44 @@
+#include <iostream>
+#include "BitmapPlusPlus.hpp"
+
+int main()
+{
+    try
+    {
+        // 8x8 chess board
+        bmp::Bitmap image(640, 640);
+        const std::size_t board_dims = 8;
+        const std::size_t rect_w = image.width() / board_dims;
+        const std::size_t rect_h = image.height() / board_dims;
+
+        // Iterate over rects
+        bool is_white = true;
+        for (std::size_t x = 0; x < image.width(); x += rect_w)
+        {
+            for (std::size_t y = 0; y < image.height(); y += rect_h)
+            {
+                bmp::Pixel color = is_white ? bmp::White : bmp::Black;
+                // Fill rect
+                for (size_t dx = x; dx < x + rect_w; dx++)
+                {
+                    for (size_t dy = y; dy < y + rect_h; dy++)
+                    {
+                        image.set(dx, dy, color);
+                    }
+                }
+                is_white = !is_white;
+            }
+            is_white = !is_white;
+        }
+
+        // Save bitmap to file
+        image.save("chess_board.bmp");
+
+        return EXIT_SUCCESS;
+    }
+    catch (const bmp::Exception &e)
+    {
+        std::cerr << "[BMP ERROR]: " << e.what() << '\n';
+        return EXIT_FAILURE;
+    }
+}