added commentary to output.c

output.c

 #include "output.h"
 
+//V: renderer exists, enum row_type is correct and not renamed, correct y coordinates are transferred
+//N: img corresponding to row_type is set to coordinates: x: 0 to 900 y: y to y+100 and displayed via renderer
 int paste_row(SDL_Renderer* renderer, int y, enum row row_type){
 
     SDL_Rect destination = {
@@ -60,7 +62,10 @@ int paste_row(SDL_Renderer* renderer, int y, enum row row_type){
     return 0;
 }
 
+//V renderer exists, correct x, y coordinates and width and height and speed and type of car is passed on
+//N: car is set to correct variables and displayed in renderer with correct image and direction 
 int paste_car(SDL_Renderer* renderer, int x, int y, int width, int height,int speed,enum vehicle type) {
+    //Prevents cars from being displayed at the wrong position 
     int offset = 20;
     
     if (type == coin){
@@ -73,6 +78,8 @@ int paste_car(SDL_Renderer* renderer, int x, int y, int width, int height,int sp
                 .w = width,   
                 .h = height};
 
+    //correct "car" type is displayed
+    //could be implemented like above with switch case
     if (type == boat){
             if (SDL_RenderCopy(renderer, img_plank, NULL, &rect) != 0) {
                 SDL_Log("Bild konnte nicht kopiert werden! SDL_Error Error: %s\n",SDL_GetError());
@@ -123,7 +130,9 @@ int paste_car(SDL_Renderer* renderer, int x, int y, int width, int height,int sp
     return(0);
 }
 
-
+//used to calculate width of score display
+//V: score exists
+//N: returns int corresponding to digits of score
 int func_digits(int score){
     if (score == 0)
         return(1);
@@ -135,6 +144,8 @@ int func_digits(int score){
     return(i);
 }
 
+//V: renderer exists
+//N: current playerhighscore is displayed in white in the upper right corner
 int paste_score (SDL_Renderer* renderer) {
     
     int digits = func_digits(playerhighscore);
@@ -157,7 +168,8 @@ int paste_score (SDL_Renderer* renderer) {
         return -1;
     }
 
-    char output [5];
+    char output [10];
+    //max displayable score has 10 digits 
     sprintf(output, "%d", playerhighscore);
     SDL_Surface* surfaceMessage = 
         TTF_RenderText_Blended_Wrapped (font, output, (SDL_Color) {225, 225, 225, 255}, 4*200);