Initialization

a2/snake.c

@@ -1,58 +1,110 @@
-#include "snake.h"
+#include "world.h"
 #include <stdlib.h>
+#include <curses.h>
+#include <stdlib.h>
+#include <string.h>
+#include "snake.h"
+// This file contains functions for drawing the the game and changing the state
 
-struct snake* add_snake(struct snake* snake,int x,int y){
-    struct snake* head = calloc(1,sizeof(struct snake));
-    head->x = x;
-    head->y = y;
-    head->next = snake;
-    return head;
+// Start is called one in the beginning
+void* init_game(){
+    // Allocate memory for the state
+    struct state* st = calloc(1,(sizeof(struct state)));
+    return st;
 }
 
-struct snake* remove_snake(struct snake* snake) {
-    if (snake == NULL) {
-        return NULL;
+// The first event
+// Initialize game state
+// - borders
+// - snake position
+// - food position
+void init_snake(struct event* world, struct state* st){
+    int cy = world->height/2;
+    int cx = world->width/2 - 5;
+    for (int i = 0; i < 5; i++){
+        st->snake = add_snake(st->snake,cx + i ,cy);
     }
 
-    if (snake->next == NULL) {
-        free(snake);
-        return NULL;
+    int h = world->height;
+    int w = world->width;
+    for (int i = 0; i < 5; i++){
+        st->foodx[i] = rand() % w;
+        st->foody[i] = rand() % h;
     }
-
-    struct snake* current = snake;
-    while (current->next->next != NULL) {
-        current = current->next;
-    }
-
-    free(current->next);
-    current->next = NULL;
-
-    return snake;
+    // Initial game vector
+    st->sx = 1;
+    st->sy = 0;
 }
 
-void free_snake(struct snake* sn) {
-    struct snake* current = sn;
-    struct snake* next;
-
-    while (current!= NULL) {
-        next = current->next;
-        free(current);
-        current = next;
+// Step is called in a loop once in interval.
+// It should modify the state and draw it.
+int world_event(struct event* w,void* game){
+    // Get state pointer
+    struct state* st = game;
+    if (w->type == EVENT_START){
+        // Called on beginning
+        init_snake(w,st);
     }
-}
-
-int is_snake(struct snake* snake,int x,int y){
-    while (snake != NULL) {
-        if (snake->x == x && snake->y == y) {
+    // Called on key press
+    else if (w->type == EVENT_KEY){
+        int key = w->key;
+        // Modifies vector of snake movement
+        if (key == KEY_RIGHT){
+           st->sx = 1;
+           st->sy = 0;
+        }
+        else if (key == KEY_LEFT){
+            st->sx = -1;
+            st->sy = 0;
+        }
+        else if (key == KEY_DOWN){
+            st->sx = 0;
+            st->sy = 1;
+        }
+        else if (key == KEY_UP){
+            st->sx = 0;
+            st->sy = -1;
+        }
+    }
+    // Called on esc key
+    else if (w->type == EVENT_ESC){
+            // Non zero means finish the loop and stop the game.
             return 1;
     }
-        snake = snake->next;
+    // Called on interval timeout
+    else if (w->type == EVENT_TIMEOUT){
+        clear_screen();
+        // Copy screen size
+        st->width = w->width;
+        st->height = w->height;
+        // Change game state
+        int r = step_state(st);
+        char ms[200];
+        sprintf(ms,"r %d\n",r);
+        set_message(ms,9,9);
+        // Draw snake
+        struct snake* sn = st->snake;
+        while (sn != NULL){
+            set_cell('x',sn->x,sn->y);
+            sn = sn->next;
+        }
+        // Draw food
+        for (int i = 0 ; i < FOOD_COUNT; i++){
+            if (st->foodx[i] >= 0 && st->foody[i] >= 0){
+                set_cell('*',st->foodx[i],st->foody[i]);
+            }
+        }
+        // Stop the game
+        if (r){
+            char message[] = "Koniec";
+            set_message(message,10,10);
+        }
     }
     return 0;
 }
 
-int step_state(struct state* st){
-	int nx = (st->snake->x + st->sx);
-    int ny = (st->snake->y + st->sy);
-    return END_CONTINUE;
+
+int main(int argc, char** argv){
+    start_world(init_game,world_event,free);
+    return 0;
 }