extract image constants to file

src/camera.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "rtweekend.h"
+#include "image.h"
 
 class camera
 {

src/image.h

@@ -0,0 +1,7 @@
+#pragma once
+
+const double ASPECT_RATIO = 1.0;
+const unsigned int WIDTH = 256;
+const unsigned int HEIGHT = static_cast<int>(WIDTH / ASPECT_RATIO);
+const int SAMPLES_PER_PIXEL = 8;
+const int MAX_DEPTH = 5;

src/main.cpp

@@ -5,6 +5,7 @@
 #include "colour.h"
 #include "camera.h"
 #include "material.h"
+#include "image.h"
 
 #include <iostream>
 
@@ -15,12 +16,6 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 
-const double ASPECT_RATIO = 1.0;
-const unsigned int WIDTH = 256;
-const unsigned int HEIGHT = static_cast<int>(WIDTH / ASPECT_RATIO);
-const int SAMPLES_PER_PIXEL = 8;
-const int MAX_DEPTH = 5;
-
 // file descriptor of the socket we're listening for connections on
 //
 // returns fd for the client connection