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https://github.com/raysan5/raylib.git
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399 lines
13 KiB
C
399 lines
13 KiB
C
/*******************************************************************************************
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*
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* raylib - sample game: space invaders
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*
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* Sample game developed by Ian Eito, Albert Martos and Ramon Santamaria
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*
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* This game has been created using raylib v1.3 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Copyright (c) 2015 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#if defined(PLATFORM_WEB)
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#include <emscripten/emscripten.h>
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#endif
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//----------------------------------------------------------------------------------
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// Some Defines
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//----------------------------------------------------------------------------------
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#define NUM_SHOOTS 50
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#define NUM_MAX_ENEMIES 50
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#define FIRST_WAVE 10
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#define SECOND_WAVE 20
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#define THIRD_WAVE 50
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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//----------------------------------------------------------------------------------
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typedef enum { FIRST = 0, SECOND, THIRD } EnemyWave;
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typedef struct Player{
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Rectangle rec;
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Vector2 speed;
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Color color;
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} Player;
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typedef struct Enemy{
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Rectangle rec;
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Vector2 speed;
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bool active;
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Color color;
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} Enemy;
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typedef struct Shoot{
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Rectangle rec;
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Vector2 speed;
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bool active;
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Color color;
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} Shoot;
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//------------------------------------------------------------------------------------
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// Global Variables Declaration
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//------------------------------------------------------------------------------------
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static const int screenWidth = 800;
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static const int screenHeight = 450;
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static bool gameOver = false;
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static bool pause = false;
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static int score = 0;
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static bool victory = false;
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static Player player = { 0 };
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static Enemy enemy[NUM_MAX_ENEMIES] = { 0 };
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static Shoot shoot[NUM_SHOOTS] = { 0 };
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static EnemyWave wave = { 0 };
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static int shootRate = 0;
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static float alpha = 0.0f;
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static int activeEnemies = 0;
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static int enemiesKill = 0;
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static bool smooth = false;
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//------------------------------------------------------------------------------------
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// Module Functions Declaration (local)
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//------------------------------------------------------------------------------------
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static void InitGame(void); // Initialize game
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static void UpdateGame(void); // Update game (one frame)
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static void DrawGame(void); // Draw game (one frame)
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static void UnloadGame(void); // Unload game
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static void UpdateDrawFrame(void); // Update and Draw (one frame)
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization (Note windowTitle is unused on Android)
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//---------------------------------------------------------
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InitWindow(screenWidth, screenHeight, "sample game: space invaders");
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InitGame();
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#if defined(PLATFORM_WEB)
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emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
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#else
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update and Draw
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//----------------------------------------------------------------------------------
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UpdateDrawFrame();
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//----------------------------------------------------------------------------------
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}
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#endif
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// De-Initialization
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//--------------------------------------------------------------------------------------
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UnloadGame(); // Unload loaded data (textures, sounds, models...)
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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//------------------------------------------------------------------------------------
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// Module Functions Definitions (local)
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//------------------------------------------------------------------------------------
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// Initialize game variables
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void InitGame(void)
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{
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// Initialize game variables
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shootRate = 0;
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pause = false;
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gameOver = false;
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victory = false;
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smooth = false;
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wave = FIRST;
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activeEnemies = FIRST_WAVE;
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enemiesKill = 0;
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score = 0;
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alpha = 0;
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// Initialize player
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player.rec.x = 20;
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player.rec.y = 50;
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player.rec.width = 20;
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player.rec.height = 20;
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player.speed.x = 5;
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player.speed.y = 5;
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player.color = BLACK;
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// Initialize enemies
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for (int i = 0; i < NUM_MAX_ENEMIES; i++)
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{
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enemy[i].rec.width = 10;
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enemy[i].rec.height = 10;
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enemy[i].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
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enemy[i].rec.y = GetRandomValue(0, screenHeight - enemy[i].rec.height);
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enemy[i].speed.x = 5;
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enemy[i].speed.y = 5;
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enemy[i].active = true;
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enemy[i].color = GRAY;
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}
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// Initialize shoots
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for (int i = 0; i < NUM_SHOOTS; i++)
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{
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shoot[i].rec.x = player.rec.x;
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shoot[i].rec.y = player.rec.y + player.rec.height/4;
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shoot[i].rec.width = 10;
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shoot[i].rec.height = 5;
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shoot[i].speed.x = 7;
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shoot[i].speed.y = 0;
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shoot[i].active = false;
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shoot[i].color = MAROON;
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}
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}
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// Update game (one frame)
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void UpdateGame(void)
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{
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if (!gameOver)
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{
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if (IsKeyPressed('P')) pause = !pause;
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if (!pause)
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{
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switch (wave)
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{
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case FIRST:
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{
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if (!smooth)
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{
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alpha += 0.02f;
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if (alpha >= 1.0f) smooth = true;
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}
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if (smooth) alpha -= 0.02f;
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if (enemiesKill == activeEnemies)
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{
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enemiesKill = 0;
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for (int i = 0; i < activeEnemies; i++)
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{
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if (!enemy[i].active) enemy[i].active = true;
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}
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activeEnemies = SECOND_WAVE;
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wave = SECOND;
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smooth = false;
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alpha = 0.0f;
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}
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} break;
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case SECOND:
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{
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if (!smooth)
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{
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alpha += 0.02f;
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if (alpha >= 1.0f) smooth = true;
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}
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if (smooth) alpha -= 0.02f;
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if (enemiesKill == activeEnemies)
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{
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enemiesKill = 0;
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for (int i = 0; i < activeEnemies; i++)
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{
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if (!enemy[i].active) enemy[i].active = true;
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}
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activeEnemies = THIRD_WAVE;
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wave = THIRD;
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smooth = false;
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alpha = 0.0f;
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}
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} break;
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case THIRD:
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{
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if (!smooth)
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{
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alpha += 0.02f;
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if (alpha >= 1.0f) smooth = true;
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}
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if (smooth) alpha -= 0.02f;
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if (enemiesKill == activeEnemies) victory = true;
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} break;
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default: break;
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}
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// Player movement
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if (IsKeyDown(KEY_RIGHT)) player.rec.x += player.speed.x;
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if (IsKeyDown(KEY_LEFT)) player.rec.x -= player.speed.x;
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if (IsKeyDown(KEY_UP)) player.rec.y -= player.speed.y;
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if (IsKeyDown(KEY_DOWN)) player.rec.y += player.speed.y;
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// Player collision with enemy
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for (int i = 0; i < activeEnemies; i++)
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{
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if (CheckCollisionRecs(player.rec, enemy[i].rec)) gameOver = true;
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}
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// Enemy behaviour
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for (int i = 0; i < activeEnemies; i++)
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{
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if (enemy[i].active)
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{
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enemy[i].rec.x -= enemy[i].speed.x;
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if (enemy[i].rec.x < 0)
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{
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enemy[i].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
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enemy[i].rec.y = GetRandomValue(0, screenHeight - enemy[i].rec.height);
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}
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}
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}
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// Wall behaviour
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if (player.rec.x <= 0) player.rec.x = 0;
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if (player.rec.x + player.rec.width >= screenWidth) player.rec.x = screenWidth - player.rec.width;
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if (player.rec.y <= 0) player.rec.y = 0;
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if (player.rec.y + player.rec.height >= screenHeight) player.rec.y = screenHeight - player.rec.height;
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// Shoot initialization
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if (IsKeyDown(KEY_SPACE))
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{
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shootRate += 5;
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for (int i = 0; i < NUM_SHOOTS; i++)
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{
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if (!shoot[i].active && shootRate%20 == 0)
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{
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shoot[i].rec.x = player.rec.x;
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shoot[i].rec.y = player.rec.y + player.rec.height/4;
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shoot[i].active = true;
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break;
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}
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}
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}
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// Shoot logic
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for (int i = 0; i < NUM_SHOOTS; i++)
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{
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if (shoot[i].active)
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{
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// Movement
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shoot[i].rec.x += shoot[i].speed.x;
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// Collision with enemy
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for (int j = 0; j < activeEnemies; j++)
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{
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if (enemy[j].active)
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{
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if (CheckCollisionRecs(shoot[i].rec, enemy[j].rec))
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{
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shoot[i].active = false;
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enemy[j].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
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enemy[j].rec.y = GetRandomValue(0, screenHeight - enemy[j].rec.height);
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shootRate = 0;
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enemiesKill++;
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score += 100;
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}
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if (shoot[i].rec.x + shoot[i].rec.width >= screenWidth)
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{
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shoot[i].active = false;
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shootRate = 0;
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}
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}
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}
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}
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}
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}
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}
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else
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{
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if (IsKeyPressed(KEY_ENTER))
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{
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InitGame();
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gameOver = false;
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}
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}
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}
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// Draw game (one frame)
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void DrawGame(void)
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{
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BeginDrawing();
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ClearBackground(RAYWHITE);
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if (!gameOver)
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{
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DrawRectangleRec(player.rec, player.color);
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if (wave == FIRST) DrawText("FIRST WAVE", screenWidth/2 - MeasureText("FIRST WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
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else if (wave == SECOND) DrawText("SECOND WAVE", screenWidth/2 - MeasureText("SECOND WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
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else if (wave == THIRD) DrawText("THIRD WAVE", screenWidth/2 - MeasureText("THIRD WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
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for (int i = 0; i < activeEnemies; i++)
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{
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if (enemy[i].active) DrawRectangleRec(enemy[i].rec, enemy[i].color);
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}
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for (int i = 0; i < NUM_SHOOTS; i++)
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{
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if (shoot[i].active) DrawRectangleRec(shoot[i].rec, shoot[i].color);
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}
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DrawText(TextFormat("%04i", score), 20, 20, 40, GRAY);
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if (victory) DrawText("YOU WIN", screenWidth/2 - MeasureText("YOU WIN", 40)/2, screenHeight/2 - 40, 40, BLACK);
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if (pause) DrawText("GAME PAUSED", screenWidth/2 - MeasureText("GAME PAUSED", 40)/2, screenHeight/2 - 40, 40, GRAY);
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}
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else DrawText("PRESS [ENTER] TO PLAY AGAIN", GetScreenWidth()/2 - MeasureText("PRESS [ENTER] TO PLAY AGAIN", 20)/2, GetScreenHeight()/2 - 50, 20, GRAY);
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EndDrawing();
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}
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// Unload game variables
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void UnloadGame(void)
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{
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// TODO: Unload all dynamic loaded data (textures, sounds, models...)
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}
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// Update and Draw (one frame)
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void UpdateDrawFrame(void)
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{
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UpdateGame();
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DrawGame();
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}
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