Added a counter system

Each time the square is touched, the counter increments. It uses
SDL_ttf to render the counter. As simple as this addition may be,
I had to surprisingly add a buttload of code to render a damn
number. Low level programming is such a lovely experience :').

config.mk

@@ -23,6 +23,7 @@ LIB :=\
         c\
 	SDL2main\
 	SDL2\
+	SDL2_ttf
 
 INCDIR :=\
 	src/

src/init.c

@@ -28,6 +28,7 @@
 #include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_surface.h>
+#include <SDL2/SDL_ttf.h>
 #include <SDL2/SDL_video.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -39,14 +40,21 @@ SDL_Renderer *main_render;
 SDL_Event    *main_event;
 SDL_Texture  *background;
 SDL_Rect     *rectangle;
+SDL_Surface  *text_surface;
+SDL_Texture  *text_texture;
+TTF_Font     *text_font;
+SDL_Color    *text_color;
+SDL_Rect      counter_box;
 
 int
 init_program (void) {
 	/* Initialization Checks */
 
-	if (SDL_Init (SDL_INIT_VIDEO) != 0) {
+	if (SDL_Init (SDL_INIT_VIDEO) < 0)
 		return fprintf (stderr, "SDL initialization error: %s\n", SDL_GetError ());
-	}
+
+	if (TTF_Init () < 0)
+		return fprintf (stderr, "Font initialization error: %s\n", SDL_GetError ());
 
 	/* window variable initialization */
 
@@ -64,7 +72,11 @@ init_program (void) {
 	/* Background initialization */
 
 	main_render = SDL_CreateRenderer (window, -1, 0);
-	background  = SDL_CreateTexture (main_render, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, SCREEN_WIDTH, SCREEN_HEIGHT);
+	background  = SDL_CreateTexture (main_render,
+                                        SDL_PIXELFORMAT_RGBA8888,
+                                        SDL_TEXTUREACCESS_TARGET,
+                                        SCREEN_WIDTH,
+                                        SCREEN_HEIGHT);
 
 	/* Initialize rectangle*/
 
@@ -72,6 +84,18 @@ init_program (void) {
 	rectangle->w = RECT_SIZE;
 	rectangle->h = RECT_SIZE;
 
+	/* Counter initialization */
+
+	counter_box.x = COUNTER_BOX_X;
+	counter_box.y = COUNTER_BOX_Y;
+	text_font     = TTF_OpenFont ("arimo.ttf", COUNTER_TEXT_SIZE);
+	text_surface  = NULL;
+	text_texture  = NULL;
+	text_color    = calloc (1, sizeof (SDL_Color));
+	text_color->r = 255;
+	text_color->g = 255;
+	text_color->b = 255;
+
 	/* A new variable is created called main_event, which is a SDL_Event type, which itself is a structure
 	 * of multiple structures... of events... */
 

src/main.c

@@ -29,15 +29,14 @@
 #include <stdbool.h>
 #include <stdlib.h>
 
-#define HEX_POKE 0xFF
+#define HEX_POKE       0xFF
+#define COUNTER_DIGITS 100
 
 int
 main (int argc, char *argv[]) {
 
-	struct coords {
-		int x;
-		int y;
-	} ray;
+	struct pos ray;
+	int        counter = 0;
 
 	Uint8 bg_red   = 0x00;
 	Uint8 bg_green = HEX_POKE;
@@ -57,20 +56,47 @@ main (int argc, char *argv[]) {
 
 	for (;;) {
 
+		/* Initialize counter array - max 100 digits */
+
+		char counter_text[COUNTER_DIGITS];
+
 		/* Constantly initialize boolean values for corners, each for loop
 		 * iteration they change values */
 
 		bool x_limit = (rectangle->x <= 0 || rectangle->x >= SCREEN_WIDTH - RECT_SIZE);
 		bool y_limit = (rectangle->y <= 0 || rectangle->y >= SCREEN_HEIGHT - RECT_SIZE);
 
+		/* Insert counter values into the array */
+
+		snprintf (counter_text, sizeof (counter_text), "%d", counter);
+
+		text_surface = TTF_RenderText_Solid (text_font, counter_text, *text_color);
+		text_texture = SDL_CreateTextureFromSurface (main_render, text_surface);
+
+		/* Snatch counter_box's width and size by querying text_surface */
+
+		SDL_QueryTexture (text_texture, NULL, NULL, &counter_box.w, &counter_box.h);
+
+		/* Background render*/
+
 		SDL_SetRenderTarget (main_render, background);
 		SDL_SetRenderDrawColor (main_render, bg_red, bg_green, bg_blue, 0x00);
 		SDL_RenderClear (main_render);
+
+		/* Rectangle render */
+
 		SDL_RenderDrawRect (main_render, rectangle);
 		SDL_SetRenderDrawColor (main_render, HEX_POKE, 0x00, 0x00, 0x00);
 		SDL_RenderFillRect (main_render, rectangle);
 		SDL_SetRenderTarget (main_render, NULL);
 		SDL_RenderCopy (main_render, background, NULL, NULL);
+
+		/* Counter render */
+
+		SDL_RenderCopy (main_render, text_texture, NULL, &counter_box);
+
+		/* All finished, time to show on screen */
+
 		SDL_RenderPresent (main_render);
 
 		/* Normally the rect constantly goes up diagonally, if it reaches a
@@ -98,7 +124,9 @@ main (int argc, char *argv[]) {
 
 				case SDL_MOUSEMOTION:
 					if (check_interaction_in_rect (main_event->motion.x, main_event->motion.y, rectangle)) {
-						printf ("Mouse cursor is inside the square at position (%d,%d)\n", main_event->motion.x, main_event->motion.y);
+						printf ("Mouse cursor is inside the square at position (%d,%d)\n",
+						        main_event->motion.x,
+						        main_event->motion.y);
 						ray.x *= -1;
 						ray.y *= -1;
 						rectangle->x = rand () % (int) (SCREEN_WIDTH - 1 - RECT_SIZE);
@@ -106,18 +134,20 @@ main (int argc, char *argv[]) {
 						bg_red       = rand () & HEX_POKE;
 						bg_green     = rand () & HEX_POKE;
 						bg_blue      = rand () & HEX_POKE;
+						counter++;
 					}
 					break;
 
 				default:
 					break;
-
-					/* Constantly increment / decrement rectangle position */
-
-					rectangle->x = rectangle->x + (1 * ray.x);
-					rectangle->y = rectangle->y + (1 * ray.y);
-
-					SDL_Delay (3);
 			}
+		/* Constantly increment / decrement rectangle position */
+
+		rectangle->x = rectangle->x + (1 * ray.x);
+		rectangle->y = rectangle->y + (1 * ray.y);
+
+		/* Add a delay, let the CPU breathe */
+
+		SDL_Delay (3);
 	}
 }

src/window.h

@@ -23,9 +23,11 @@
 #define WINDOW_H
 
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_pixels.h>
 #include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_stdinc.h>
+#include <SDL2/SDL_ttf.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -41,14 +43,24 @@
 
 #define RECT_SIZE 100
 
+#define COUNTER_BOX_X     10
+#define COUNTER_BOX_Y     530
+#define COUNTER_TEXT_SIZE 48
+
 extern SDL_Window   *window;
 extern SDL_Renderer *main_render;
 extern SDL_Texture  *background;
 extern SDL_Rect     *rectangle;
 extern SDL_Event    *main_event;
+extern SDL_Surface  *text_surface;
+extern SDL_Texture  *text_texture;
+extern TTF_Font     *text_font;
+extern SDL_Color    *text_color;
+extern SDL_Rect      counter_box;
+
 struct pos {
-	Uint16 x;
-	Uint16 y;
+	int x;
+	int y;
 };
 
 int init_program (void);