Rudimentary support for inputting game mode through GUI instead of command-line

The only thing that 'works' right now is the skeleton GUI structure. The buttons don't
actually do anything.

main.cpp

@@ -19,6 +19,11 @@
 #include <ctime>
 #include <sstream>
 #include "includes/raylib-cpp/raylib-cpp.hpp"
+
+#define RAYGUI_IMPLEMENTATION
+#include "includes/raygui/raygui.h"
+#include "includes/raygui/style_dark.h"
+
 #include "includes/paddle.hpp"
 #include "includes/ball.hpp"
 #include "includes/easysock.hpp"
@@ -217,6 +222,50 @@ int main(int argc, char** argv) {
 	bool game_started = false;
 	srand(std::time(NULL));
 
+
+
+	/* Display a drop-down menu, to allow user to pick between Single player, server and client. This section of the code uses the raygui library, and is written in C. */
+
+	GuiLoadStyleDark(); // Load the dark theme style
+	/* Modify the default style, by changing font size and spacing */
+	int font_size = 25;
+	int font_spacing = 2;
+	GuiSetStyle(DEFAULT, TEXT_SIZE, font_size);
+	GuiSetStyle(DEFAULT, TEXT_SPACING, font_spacing);
+
+	/* Set variables to position objects on screen */
+	int selected_item = 0; 	// variable to hold the index of the selected item
+	char* game_mode_txt = "Select Game Mode"; // Text to display
+	/* Size of the label, drop down box and button */
+	Vector2 label_size = MeasureTextEx(GetFontDefault(), game_mode_txt, font_size, font_spacing); // Set the size based on the width of the string to print, the font size and the text spacing. I added 1 to font_size and font_spacing, to account for any possible rounding errors, since the function expects floats.
+	Vector2 box_size = (Vector2){label_size.x, HEIGHT / 20};
+	bool is_being_edited = false; // Indicates whether the drop-down menu is being 'edited' i.e. whether an option is being selected
+	bool button_pressed = false; // Indicates whether the submit button has been pressed
+	
+	while (button_pressed == false) {
+		BeginDrawing();
+		ClearBackground(BLACK);
+		GuiLabel((Rectangle){(WIDTH/2)-(label_size.x/2), (HEIGHT/8), label_size.x, label_size.y}, game_mode_txt);
+		if (is_being_edited) {
+			GuiLock();
+		}
+
+		/* Button that allows user to proceed */
+		button_pressed = GuiButton((Rectangle){(WIDTH/2)-(box_size.x/2), (HEIGHT/2) + (HEIGHT/8), box_size.x, box_size.y}, "Continue");
+
+		/* Drop-down menu, that allows user to select game mode */
+		if (GuiDropdownBox((Rectangle){(WIDTH/2) - (box_size.x/2), (HEIGHT/2) - (HEIGHT/8), box_size.x, box_size.y}, "SINGLE;CLIENT;SERVER", &selected_item, is_being_edited)) { // This function returns != 0 if there was a mouse click inside the dropdown area
+			is_being_edited = !is_being_edited; // If the dropdown menu was selected, then it is being edited (or not being edited, if it previously was).
+		}
+		
+//		printf("%d\n", selected_item);	
+		GuiUnlock();
+		EndDrawing();
+	}
+	
+	
+
+
 	/* Variable to store the response given by the other player */
 	std::string response;
 	Serial_Data response_data;