First Commit

space_invaders.c

+/*******************************************************************************************
+*
+*   raylib - sample game: space invaders
+*
+*   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 NUM_SHOOTS 50
+#define NUM_MAX_ENEMIES 50
+#define FIRST_WAVE 10
+#define SECOND_WAVE 20
+#define THIRD_WAVE 50
+
+//----------------------------------------------------------------------------------
+// Types and Structures Definition
+//----------------------------------------------------------------------------------
+typedef enum { FIRST = 0, SECOND, THIRD } EnemyWave;
+
+typedef struct Player{
+    Rectangle rec;
+    Vector2 speed;
+    Color color;
+} Player;
+
+typedef struct Enemy{
+    Rectangle rec;
+    Vector2 speed;
+    bool active;
+    Color color;
+} Enemy;
+
+typedef struct Shoot{
+    Rectangle rec;
+    Vector2 speed;
+    bool active;
+    Color color;
+} Shoot;
+
+//------------------------------------------------------------------------------------
+// Global Variables Declaration
+//------------------------------------------------------------------------------------
+static const int screenWidth = 800;
+static const int screenHeight = 450;
+
+static bool gameOver = false;
+static bool pause =  false;
+static int score = 0;
+static bool victory = false;
+
+static Player player = { 0 };
+static Enemy enemy[NUM_MAX_ENEMIES] = { 0 };
+static Shoot shoot[NUM_SHOOTS] = { 0 };
+static EnemyWave wave = { 0 };
+
+static int shootRate = 0;
+static float alpha = 0.0f;
+
+static int activeEnemies = 0;
+static int enemiesKill = 0;
+static bool smooth = false;
+
+//------------------------------------------------------------------------------------
+// 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(void)
+{
+    // Initialization (Note windowTitle is unused on Android)
+    //---------------------------------------------------------
+    InitWindow(screenWidth, screenHeight, "sample game: space invaders");
+
+    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 and Draw
+        //----------------------------------------------------------------------------------
+        UpdateDrawFrame();
+        //----------------------------------------------------------------------------------
+    }
+#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)
+{
+    // Initialize game variables
+    shootRate = 0;
+    pause = false;
+    gameOver = false;
+    victory = false;
+    smooth = false;
+    wave = FIRST;
+    activeEnemies = FIRST_WAVE;
+    enemiesKill = 0;
+    score = 0;
+    alpha = 0;
+
+    // Initialize player
+    player.rec.x =  20;
+    player.rec.y = 50;
+    player.rec.width = 20;
+    player.rec.height = 20;
+    player.speed.x = 5;
+    player.speed.y = 5;
+    player.color = BLACK;
+
+    // Initialize enemies
+    for (int i = 0; i < NUM_MAX_ENEMIES; i++)
+    {
+        enemy[i].rec.width = 10;
+        enemy[i].rec.height = 10;
+        enemy[i].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
+        enemy[i].rec.y = GetRandomValue(0, screenHeight - enemy[i].rec.height);
+        enemy[i].speed.x = 5;
+        enemy[i].speed.y = 5;
+        enemy[i].active = true;
+        enemy[i].color = GRAY;
+    }
+
+    // Initialize shoots
+    for (int i = 0; i < NUM_SHOOTS; i++)
+    {
+        shoot[i].rec.x = player.rec.x;
+        shoot[i].rec.y = player.rec.y + player.rec.height/4;
+        shoot[i].rec.width = 10;
+        shoot[i].rec.height = 5;
+        shoot[i].speed.x = 7;
+        shoot[i].speed.y = 0;
+        shoot[i].active = false;
+        shoot[i].color = MAROON;
+    }
+}
+
+// Update game (one frame)
+void UpdateGame(void)
+{
+    if (!gameOver)
+    {
+        if (IsKeyPressed('P')) pause = !pause;
+
+        if (!pause)
+        {
+            switch (wave)
+            {
+                case FIRST:
+                {
+                    if (!smooth)
+                    {
+                        alpha += 0.02f;
+                        
+                        if (alpha >= 1.0f) smooth = true;
+                    }
+                    
+                    if (smooth) alpha -= 0.02f;
+                    
+                    if (enemiesKill == activeEnemies)
+                    {
+                        enemiesKill = 0;
+
+                        for (int i = 0; i < activeEnemies; i++)
+                        {
+                            if (!enemy[i].active) enemy[i].active = true;
+                        }
+                        
+                        activeEnemies = SECOND_WAVE;
+                        wave = SECOND;
+                        smooth = false;
+                        alpha = 0.0f;
+                    }
+                } break;
+                case SECOND:
+                {
+                    if (!smooth)
+                    {
+                        alpha += 0.02f;
+                        
+                        if (alpha >= 1.0f) smooth = true;
+                    }
+                    
+                    if (smooth) alpha -= 0.02f;
+                    
+                    if (enemiesKill == activeEnemies)
+                    {
+                        enemiesKill = 0;
+
+                        for (int i = 0; i < activeEnemies; i++)
+                        {
+                            if (!enemy[i].active) enemy[i].active = true;
+                        }
+                        
+                        activeEnemies = THIRD_WAVE;
+                        wave = THIRD;
+                        smooth = false;
+                        alpha = 0.0f;
+                    }
+                } break;
+                case THIRD:
+                {
+                    if (!smooth)
+                    {
+                        alpha += 0.02f;
+                        
+                        if (alpha >= 1.0f) smooth = true;
+                    }
+                    
+                    if (smooth) alpha -= 0.02f;
+                    
+                    if (enemiesKill == activeEnemies) victory = true;
+                        
+                } break;
+                default: break;
+            }
+
+            // Player movement
+            if (IsKeyDown(KEY_RIGHT)) player.rec.x += player.speed.x;
+            if (IsKeyDown(KEY_LEFT)) player.rec.x -= player.speed.x;
+            if (IsKeyDown(KEY_UP)) player.rec.y -= player.speed.y;
+            if (IsKeyDown(KEY_DOWN)) player.rec.y += player.speed.y;
+
+            // Player collision with enemy
+            for (int i = 0; i < activeEnemies; i++)
+            {
+                if (CheckCollisionRecs(player.rec, enemy[i].rec)) gameOver = true;
+            }
+
+             // Enemy behaviour
+            for (int i = 0; i < activeEnemies; i++)
+            {
+                if (enemy[i].active)
+                {
+                    enemy[i].rec.x -= enemy[i].speed.x;
+
+                    if (enemy[i].rec.x < 0)
+                    {
+                        enemy[i].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
+                        enemy[i].rec.y = GetRandomValue(0, screenHeight - enemy[i].rec.height);
+                    }
+                }
+            }
+
+            // Wall behaviour
+            if (player.rec.x <= 0) player.rec.x = 0;
+            if (player.rec.x + player.rec.width >= screenWidth) player.rec.x = screenWidth - player.rec.width;
+            if (player.rec.y <= 0) player.rec.y = 0;
+            if (player.rec.y + player.rec.height >= screenHeight) player.rec.y = screenHeight - player.rec.height;
+
+            // Shoot initialization
+            if (IsKeyDown(KEY_SPACE))
+            {
+                shootRate += 5;
+
+                for (int i = 0; i < NUM_SHOOTS; i++)
+                {
+                    if (!shoot[i].active && shootRate%20 == 0)
+                    {
+                        shoot[i].rec.x = player.rec.x;
+                        shoot[i].rec.y = player.rec.y + player.rec.height/4;
+                        shoot[i].active = true;
+                        break;
+                    }
+                }
+            }
+
+            // Shoot logic
+            for (int i = 0; i < NUM_SHOOTS; i++)
+            {
+                if (shoot[i].active)
+                {
+                    // Movement
+                    shoot[i].rec.x += shoot[i].speed.x;
+
+                    // Collision with enemy
+                    for (int j = 0; j < activeEnemies; j++)
+                    {
+                        if (enemy[j].active)
+                        {
+                            if (CheckCollisionRecs(shoot[i].rec, enemy[j].rec))
+                            {
+                                shoot[i].active = false;
+                                enemy[j].rec.x = GetRandomValue(screenWidth, screenWidth + 1000);
+                                enemy[j].rec.y = GetRandomValue(0, screenHeight - enemy[j].rec.height);
+                                shootRate = 0;
+                                enemiesKill++;
+                                score += 100;
+                            }
+                            
+                            if (shoot[i].rec.x + shoot[i].rec.width >= screenWidth)
+                            {
+                                shoot[i].active = false;
+                                shootRate = 0;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    else
+    {
+        if (IsKeyPressed(KEY_ENTER))
+        {
+            InitGame();
+            gameOver = false;
+        }
+    }
+}
+
+// Draw game (one frame)
+void DrawGame(void)
+{
+    BeginDrawing();
+
+        ClearBackground(RAYWHITE);
+        
+        if (!gameOver)
+        {
+            DrawRectangleRec(player.rec, player.color);
+
+            if (wave == FIRST) DrawText("FIRST WAVE", screenWidth/2 - MeasureText("FIRST WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
+            else if (wave == SECOND) DrawText("SECOND WAVE", screenWidth/2 - MeasureText("SECOND WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
+            else if (wave == THIRD) DrawText("THIRD WAVE", screenWidth/2 - MeasureText("THIRD WAVE", 40)/2, screenHeight/2 - 40, 40, Fade(BLACK, alpha));
+            
+            for (int i = 0; i < activeEnemies; i++)
+            {
+                if (enemy[i].active) DrawRectangleRec(enemy[i].rec, enemy[i].color);
+            }
+
+            for (int i = 0; i < NUM_SHOOTS; i++)
+            {
+                if (shoot[i].active) DrawRectangleRec(shoot[i].rec, shoot[i].color);
+            }
+            
+            DrawText(TextFormat("%04i", score), 20, 20, 40, GRAY);
+        
+            if (victory) DrawText("YOU WIN", screenWidth/2 - MeasureText("YOU WIN", 40)/2, screenHeight/2 - 40, 40, BLACK);
+        
+            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();
+}