feat(game): complete full game logic implementation

snake.cpp

@@ -1,14 +1,16 @@
 #include <bits/stdc++.h>
 #include <iostream>
-#include <bits/stdc++.h>
 #include <conio.h>
+#include <windows.h>
 
 using namespace std;
 
 bool gameOver;
 const int width = 40;
-const int height = 40;
+const int height = 20;
 int x, y, fruitX, fruitY, score;
+int tailX[100], tailY[100];
+int ntail;
 enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN };
 eDirection dir;
 
@@ -29,22 +31,100 @@ void draw() {
     for(int i = 0; i < height; i++) {
         for(int j = 0; j < width; j++ ) {
             if(j == 0) cout << "#";
-            cout << " ";
+            if(i == y && j == x) cout << "O";
+            else if(i == fruitY && j == fruitX) cout << "F";
+            else {
+                bool print = false;
+                for (int k = 0; k < ntail; k++) {
+                    if (tailX[k] == j && tailY[k] == i) {
+                        cout << "o";
+                        print = true;
+                    }
+                }
+                if(!print) cout << " ";
+            }
             if(j == width - 1) cout << "#";
         }
         cout << "\n";
     }
     for(int i = 0; i < width + 2; i++) cout << "#";
     cout << "\n";
+    cout << "score:" << score << "\n";
 
 }
 
 void input() {
+    if(kbhit()) {
+        char userInput = getch();
+        switch(toupper(userInput)) {
+            case 'A':
+            case 75:
+                dir = LEFT;
+                break;
+            case 'D':
+            case 77:
+                dir = RIGHT;
+                break;
+            case 'W':
+            case 72:
+                dir = UP;
+                break;
+            case 'S':
+            case 80:
+                dir = DOWN;
+                break;
+            case 27:
+                break;
 
+        }
+    }
 }
 
 void logic() {
 
+    int prevX = tailX[0];
+    int prevY = tailY[0];
+    int prev2X, prev2Y;
+    tailX[0] = x;
+    tailY[0] = y;
+    for(int i = 1; i < ntail; i++) {
+        prev2X = tailX[i];
+        prev2Y = tailY[i];
+        tailX[i] = prevX;
+        tailY[i] = prevY;
+        prevX = prev2X;
+        prevY = prev2Y; 
+    }
+
+    switch(dir){
+        case LEFT:
+            x--;
+            break;
+        case RIGHT:
+            x++;
+            break;
+        case UP:
+            y--;
+            break;
+        case DOWN:
+            y++;
+            break;
+    }
+
+    if(x >= width) x = 0;
+    else if(x < 0) x = width - 1;
+    if(y >= height) y = 0;
+    else if(y < 0) y = height - 1;
+    for(int i = 0; i < ntail; i++)
+        if(tailX[i] == x && tailY[i] == y)
+            gameOver = true;
+    if(x == fruitX && y == fruitY) {
+        score += 10;
+        fruitX = rand() % width;
+        fruitY = rand() % height;
+        ntail++;
+    }
+
 }
 
 int main() {
@@ -53,5 +133,7 @@ int main() {
         draw();
         input();
         logic();
+        Sleep(100);
     }
+    return 0;
 }