version "1.0"

  add notes

snake_FanFEI.c

@@ -9,6 +9,14 @@
 *
 *   Copyright (c) 2015 Ramon Santamaria (@raysan5)
 *
+*
+*   Expanded on this basis by Fan FEI
+*
+*
+*
+*
+*
+*
 ********************************************************************************************/
 
 #include "raylib.h"
@@ -26,7 +34,7 @@
 //----------------------------------------------------------------------------------
 // Types and Structures Definition
 //----------------------------------------------------------------------------------
-typedef struct Snake {
+typedef struct Snake { //
     Vector2 position;
     Vector2 size;
     Vector2 speed;
@@ -51,8 +59,8 @@ static bool gameOver = false;
 static bool pause = false;
 
 static Food fruit = { 0 };
-static Snake snake[SNAKE_LENGTH] = { 0 };
-static Vector2 snakePosition[SNAKE_LENGTH] = { 0 };
+static Snake snake[SNAKE_LENGTH] = { 0 }; //Maximum length of snake
+static Vector2 snakePosition[SNAKE_LENGTH] = { 0 }; //The coordinates of the snake body
 static bool allowMove = false;
 static Vector2 offset = { 0 };
 static int counterTail = 0;
@@ -73,12 +81,12 @@ int main(void)
 {
     // Initialization (Note windowTitle is unused on Android)
     //---------------------------------------------------------
-    InitWindow(screenWidth, screenHeight, "sample game: snake By FanFEI"); //Initialize the interface and title
+    InitWindow(screenWidth, screenHeight, "sample game: snake By FanFEI"); // Initialize the interface and title
 
-    InitGame();//Initialize the game 
+    InitGame(); //Initialize the game 
 
 #if defined(PLATFORM_WEB)
-    emscripten_set_main_loop(UpdateDrawFrame, 60, 1);
+    emscripten_set_main_loop(UpdateDrawFrame, 60, 1); // The number of frames can adjust the game speed
 #else
     SetTargetFPS(60);
     //--------------------------------------------------------------------------------------
@@ -110,10 +118,10 @@ int main(void)
 void InitGame(void)
 {
     framesCounter = 0;
-    gameOver = false; //Game state
+    gameOver = false; // Game state
     pause = false;
     
-    counterTail = 2; //The initial length of the snake
+    counterTail = 2; // The initial length of the snake
     allowMove = false;
 
     offset.x = screenWidth%SQUARE_SIZE;
@@ -123,10 +131,11 @@ void InitGame(void)
     {
         snake[i].position = (Vector2){ offset.x/2, offset.y/2 };
         snake[i].size = (Vector2){ SQUARE_SIZE, SQUARE_SIZE };
-        snake[i].speed = (Vector2){ SQUARE_SIZE, 0 };
+        snake[i].speed = (Vector2){ SQUARE_SIZE, 0 }; // Initial direction to the right
 
-        if (i == 0) snake[i].color = DARKBLUE; //Snake head color
-        else snake[i].color = BLUE; //Snake body color
+        if (i == 0) snake[i].color = PINK; // Snake head color
+        else if (i%3 != 0) snake[i].color = PURPLE; // Snake body color
+        else snake[i].color = DARKPURPLE;
     }
 
     for (int i = 0; i < SNAKE_LENGTH; i++)
@@ -134,8 +143,8 @@ void InitGame(void)
         snakePosition[i] = (Vector2){ 0.0f, 0.0f };
     }
 
-    fruit.size = (Vector2){ SQUARE_SIZE, SQUARE_SIZE }; //The color, coordinates and status of the props
-    fruit.color = SKYBLUE;
+    fruit.size = (Vector2){ SQUARE_SIZE, SQUARE_SIZE }; // The color, coordinates and status of the props
+    fruit.color = RED;
     fruit.active = false;
 }
 
@@ -144,11 +153,12 @@ void UpdateGame(void)
 {
     if (!gameOver)
     {
-        if (IsKeyPressed('P')) pause = !pause; //Keyboard input p pause
+        if (IsKeyPressed('P')) pause = !pause; // Keyboard input p pause
         
         if (!pause)
         {
             // Player control
+            // Only when the snake is moving in the vertical direction can it be turned horizontally
             if (IsKeyPressed(KEY_RIGHT) && (snake[0].speed.x == 0) && allowMove)
             {
                 snake[0].speed = (Vector2){ SQUARE_SIZE, 0 };
@@ -173,7 +183,7 @@ void UpdateGame(void)
             // Snake movement
             for (int i = 0; i < counterTail; i++) snakePosition[i] = snake[i].position;
 
-            if ((framesCounter%5) == 0)
+            if ((framesCounter%10) == 0)
             {
                 for (int i = 0; i < counterTail; i++)
                 {