Added welcome text; added basic player scoring mechanism; fixed bug where ball would start from different positions

pong.c

@@ -23,7 +23,6 @@ void alleg_init() {
 	return;
 }
 
-
 int main(int argc, char** argv) {
 //	Initialization
 
@@ -34,6 +33,8 @@ int main(int argc, char** argv) {
 	ALLEGRO_COLOR black = al_map_rgba(0,0,0,255);
 	ALLEGRO_COLOR white = al_map_rgba(255,255,255,255);
 	ALLEGRO_EVENT event;
+	ALLEGRO_FONT* main_font = al_load_ttf_font("/usr/share/fonts/cantarell/Cantarell-VF.otf", 30, 0);
+
 	bool running = false;
 	srand(time(NULL)); // Seed for RNG
 
@@ -46,19 +47,25 @@ int main(int argc, char** argv) {
 	float velocity_1 = 0;  // Vertical velocity of first paddle
 	float velocity_2 = 0;  // Vertical velocity of second paddle
 
-	float circ_x = 25; // Center coordinates of ball
+	float circ_x = 60; // Center coordinates of ball
 	float circ_y = 25;
 	float circ_rad = 15;  // Radius of ball
 	float ball_speed = sqrt(72); // Pythagorean distance travelled by ball in one main-loop iteration
 	float circ_vel_x = (float)(rand())/(float)(RAND_MAX / 3) + 4.0; // Horizontal velocity of ball (Randomly generated, 4 to 7) - borrowed from https://stackoverflow.com/a/13409133
-	printf("%f\n",circ_vel_x);
 	float circ_vel_y = sqrt(pow(ball_speed,2) - pow(circ_vel_x,2)); // Vertical velocity of ball - Subtract X velocity from hypotenuse / ball_speed
-	printf("%f\n",circ_vel_y);
+
+	int score_1 = 0; // Player 1 score
+	int score_2 = 0; // Player 2 score
+
+//	I reset the ball position here, so that the ball starts from the same place after I press SPACE
+	circ_x = 60;
+	circ_y = 25;
 
 	al_clear_to_color(black);
 	al_draw_filled_rectangle(start_x_1, start_y_1, start_x_1 + width, start_y_1 + height, white);
 	al_draw_filled_rectangle(start_x_2, start_y_2, start_x_2 + width, start_y_2 + height, white);
 	al_draw_filled_circle(circ_x, circ_y, circ_rad, white);
+	al_draw_text(main_font, white, (WIN_WIDTH / 2), (WIN_HEIGHT / 2), ALLEGRO_ALIGN_CENTRE, "Welcome to Pong!\0");
 	al_flip_display();
 
 	do {
@@ -67,11 +74,17 @@ int main(int argc, char** argv) {
 
 	running = true;
 
+	al_clear_to_color(black);
+	al_draw_filled_rectangle(start_x_1, start_y_1, start_x_1 + width, start_y_1 + height, white);
+	al_draw_filled_rectangle(start_x_2, start_y_2, start_x_2 + width, start_y_2 + height, white);
+	al_draw_filled_circle(circ_x, circ_y, circ_rad, white);
+	al_flip_display();
+
 	while (running) {
 		// Code borrowed from: https://stackoverflow.com/a/30078011
 
 		while (!al_is_event_queue_empty(queue)) {
-			al_wait_for_event(queue, &event);
+			al_get_next_event(queue, &event);
 
 			if (event.type == ALLEGRO_EVENT_KEY_DOWN) {
 				switch (event.keyboard.keycode) {
@@ -134,7 +147,21 @@ int main(int argc, char** argv) {
 			circ_vel_y = -circ_vel_y;
 		}
 
-
+		if (circ_x - circ_rad <= 0 || circ_x + circ_rad >= WIN_WIDTH) {
+			if (circ_x - circ_rad <= 0) {
+				score_2++;
+			}
+			if (circ_x + circ_rad >= WIN_WIDTH) {
+				score_1++;
+			}
+			printf("Player 1: %d\n",score_1);
+			printf("Player 2: %d\n\n", score_2);
+			circ_x = 60;
+			circ_y = 25;
+			circ_vel_x = (float)(rand())/(float)(RAND_MAX / 3) + 4.0;
+			circ_vel_y = sqrt(pow(ball_speed,2) - pow(circ_vel_x,2));
+			sleep(1);
+		}
 
 		//Redraw shapes
 		al_draw_filled_rectangle(start_x_1, start_y_1, start_x_1 + width, start_y_1 + height + velocity_1, white);
@@ -142,6 +169,7 @@ int main(int argc, char** argv) {
 		al_draw_filled_circle(circ_x, circ_y, circ_rad, white);
 		al_flip_display();
 
+	printf("Ball x: %.0f y: %.0f\n", circ_x, circ_y);
 	}
 
 //	Clean up