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- /*******************************************************************************************
- *
- * raylib - sample game: snake
- *
- * Sample game developed by Ian Eito, Albert Martos and Ramon Santamaria
- *
- * This game has been created using raylib v1.3 (www.raylib.com)
- * raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
- *
- * Copyright (c) 2015 Ramon Santamaria (@raysan5)
- *
- ********************************************************************************************/
-
- #include "raylib.h"
-
- #if defined(PLATFORM_WEB)
- #include <emscripten/emscripten.h>
- #endif
-
- //----------------------------------------------------------------------------------
- // Some Defines
- //----------------------------------------------------------------------------------
- #define SNAKE_LENGTH 256
- #define SQUARE_SIZE 31
-
- //----------------------------------------------------------------------------------
- // Types and Structures Definition
- //----------------------------------------------------------------------------------
- typedef struct Snake {
- Vector2 position;
- Vector2 size;
- Vector2 speed;
- Color color;
- } Snake;
-
- typedef struct Food {
- Vector2 position;
- Vector2 size;
- bool active;
- Color color;
- } Food;
-
- //------------------------------------------------------------------------------------
- // Global Variables Declaration
- //------------------------------------------------------------------------------------
- static int screenWidth = 800;
- static int screenHeight = 450;
-
- static int framesCounter;
- static bool gameOver;
- static bool pause;
-
- static Food fruit;
- static Snake snake[SNAKE_LENGTH];
- static Vector2 snakePosition[SNAKE_LENGTH];
- static bool allowMove;
- static Vector2 offset;
- static int counterTail;
-
- //------------------------------------------------------------------------------------
- // Module Functions Declaration (local)
- //------------------------------------------------------------------------------------
- static void InitGame(void); // Initialize game
- static void UpdateGame(void); // Update game (one frame)
- static void DrawGame(void); // Draw game (one frame)
- static void UnloadGame(void); // Unload game
- static void UpdateDrawFrame(void); // Update and Draw (one frame)
-
- //------------------------------------------------------------------------------------
- // Program main entry point
- //------------------------------------------------------------------------------------
- int main()
- {
- // Initialization
- //--------------------------------------------------------------------------------------
- InitWindow(screenWidth, screenHeight, "sample game: snake");
-
- InitGame();
-
- #if defined(PLATFORM_WEB)
- emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
- #else
-
- SetTargetFPS(60);
- //--------------------------------------------------------------------------------------
-
- // Main game loop
- while (!WindowShouldClose()) // Detect window close button or ESC key
- {
- // Update
- //----------------------------------------------------------------------------------
- UpdateGame();
- //----------------------------------------------------------------------------------
-
- // Draw
- //----------------------------------------------------------------------------------
- DrawGame();
- //----------------------------------------------------------------------------------
- }
- #endif
-
- // De-Initialization
- //--------------------------------------------------------------------------------------
- UnloadGame(); // Unload loaded data (textures, sounds, models...)
-
- CloseWindow(); // Close window and OpenGL context
- //--------------------------------------------------------------------------------------
-
- return 0;
- }
-
- //------------------------------------------------------------------------------------
- // Module Functions Definitions (local)
- //------------------------------------------------------------------------------------
-
- // Initialize game variables
- void InitGame(void)
- {
- framesCounter = 0;
- gameOver = false;
- pause = false;
-
- counterTail = 1;
- allowMove = false;
-
- offset.x = screenWidth%SQUARE_SIZE;
- offset.y = screenHeight%SQUARE_SIZE;
-
- for (int i = 0; i < SNAKE_LENGTH; i++)
- {
- 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 };
-
- if (i == 0) snake[i].color = DARKBLUE;
- else snake[i].color = BLUE;
- }
-
- for (int i = 0; i < SNAKE_LENGTH; i++)
- {
- snakePosition[i] = (Vector2){ 0.0f, 0.0f };
- }
-
- fruit.size = (Vector2){ SQUARE_SIZE, SQUARE_SIZE };
- fruit.color = SKYBLUE;
- fruit.active = false;
- }
-
- // Update game (one frame)
- void UpdateGame(void)
- {
- if (!gameOver)
- {
- if (IsKeyPressed('P')) pause = !pause;
-
- if (!pause)
- {
- // control
- if (IsKeyPressed(KEY_RIGHT) && (snake[0].speed.x == 0) && allowMove)
- {
- snake[0].speed = (Vector2){ SQUARE_SIZE, 0 };
- allowMove = false;
- }
- if (IsKeyPressed(KEY_LEFT) && (snake[0].speed.x == 0) && allowMove)
- {
- snake[0].speed = (Vector2){ -SQUARE_SIZE, 0 };
- allowMove = false;
- }
- if (IsKeyPressed(KEY_UP) && (snake[0].speed.y == 0) && allowMove)
- {
- snake[0].speed = (Vector2){ 0, -SQUARE_SIZE };
- allowMove = false;
- }
- if (IsKeyPressed(KEY_DOWN) && (snake[0].speed.y == 0) && allowMove)
- {
- snake[0].speed = (Vector2){ 0, SQUARE_SIZE };
- allowMove = false;
- }
-
- // movement
- for (int i = 0; i < counterTail; i++) snakePosition[i] = snake[i].position;
-
- if ((framesCounter%5) == 0)
- {
- for (int i = 0; i < counterTail; i++)
- {
- if (i == 0)
- {
- snake[0].position.x += snake[0].speed.x;
- snake[0].position.y += snake[0].speed.y;
- allowMove = true;
- }
- else snake[i].position = snakePosition[i-1];
- }
- }
-
- // wall behaviour
- if (((snake[0].position.x) > (screenWidth - offset.x)) ||
- ((snake[0].position.y) > (screenHeight - offset.y)) ||
- (snake[0].position.x < 0) || (snake[0].position.y < 0))
- {
- gameOver = true;
- }
-
- // collision with yourself
- for (int i = 1; i < counterTail; i++)
- {
- if ((snake[0].position.x == snake[i].position.x) && (snake[0].position.y == snake[i].position.y)) gameOver = true;
- }
-
- // TODO: review logic: fruit.position calculation
- if (!fruit.active)
- {
- fruit.active = true;
- fruit.position = (Vector2){ GetRandomValue(0, (screenWidth/SQUARE_SIZE) - 1)*SQUARE_SIZE + offset.x/2, GetRandomValue(0, (screenHeight/SQUARE_SIZE) - 1)*SQUARE_SIZE + offset.y/2 };
-
- for (int i = 0; i < counterTail; i++)
- {
- while ((fruit.position.x == snake[i].position.x) && (fruit.position.y == snake[i].position.y))
- {
- fruit.position = (Vector2){ GetRandomValue(0, (screenWidth/SQUARE_SIZE) - 1)*SQUARE_SIZE, GetRandomValue(0, (screenHeight/SQUARE_SIZE) - 1)*SQUARE_SIZE };
- i = 0;
- }
- }
- }
-
- // collision
- if (CheckCollisionRecs((Rectangle){(int)snake[0].position.x, (int)snake[0].position.y, (int)snake[0].size.x, (int)snake[0].size.y},
- (Rectangle){(int)fruit.position.x, (int)fruit.position.y, (int)fruit.size.x, (int)fruit.size.y}))
- {
- snake[counterTail].position = snakePosition[counterTail - 1];
- counterTail += 1;
- fruit.active = false;
- }
-
- framesCounter++;
- }
- }
- else
- {
- if (IsKeyPressed(KEY_ENTER))
- {
- InitGame();
- gameOver = false;
- }
- }
- }
-
- // Draw game (one frame)
- void DrawGame(void)
- {
- BeginDrawing();
-
- ClearBackground(RAYWHITE);
-
- if (!gameOver)
- {
- // Draw grid lines
- for (int i = 0; i < screenWidth/SQUARE_SIZE + 1; i++)
- {
- DrawLineV((Vector2){SQUARE_SIZE*i + offset.x/2, offset.y/2}, (Vector2){SQUARE_SIZE*i + offset.x/2, screenHeight - offset.y/2}, LIGHTGRAY);
- }
-
- for (int i = 0; i < screenHeight/SQUARE_SIZE + 1; i++)
- {
- DrawLineV((Vector2){offset.x/2, SQUARE_SIZE*i + offset.y/2}, (Vector2){screenWidth - offset.x/2, SQUARE_SIZE*i + offset.y/2}, LIGHTGRAY);
- }
-
- // Draw snake
- for (int i = 0; i < counterTail; i++) DrawRectangleV(snake[i].position, snake[i].size, snake[i].color);
-
- // Draw fruit to pick
- DrawRectangleV(fruit.position, fruit.size, fruit.color);
-
- if (pause) DrawText("GAME PAUSED", screenWidth/2 - MeasureText("GAME PAUSED", 40)/2, screenHeight/2 - 40, 40, GRAY);
- }
- else DrawText("PRESS [ENTER] TO PLAY AGAIN", GetScreenWidth()/2 - MeasureText("PRESS [ENTER] TO PLAY AGAIN", 20)/2, GetScreenHeight()/2 - 50, 20, GRAY);
-
- EndDrawing();
- }
-
- // Unload game variables
- void UnloadGame(void)
- {
- // TODO: Unload all dynamic loaded data (textures, sounds, models...)
- }
-
- // Update and Draw (one frame)
- void UpdateDrawFrame(void)
- {
- UpdateGame();
- DrawGame();
- }
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