raysan5.raylib/examples/ex06b_logo_anim.c

/*******************************************************************************************
*
*   raylib example 06b - raylib Logo Animation
*
*   This example has been created using raylib 1.0 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2013 Ramon Santamaria (Ray San - [email protected])
*
********************************************************************************************/

#include "raylib.h"

// Useful function for fade-ins and fade-outs
Color Fade(Color col, float alpha)
{
    return (Color){col.r, col.g, col.b, col.a*alpha};
}

int main()
{
    // Initialization
    //--------------------------------------------------------------------------------------
    int screenWidth = 800;
    int screenHeight = 450;
    
    int logoPositionX = screenWidth/2 - 128;
    int logoPositionY = screenHeight/2 - 128;
    
    int framesCounter = 0;
    int lettersCount = 0;
    
    int topSideRecWidth = 16;
    int leftSideRecHeight = 16;
    
    int bottomSideRecWidth = 16;
    int rightSideRecHeight = 16;
    
    char raylib[8] = "       ";     // raylib text array, max 8 letters
    
    int state = 0;                  // Tracking animation states (State Machine)
    
    float alpha = 1.0;              // Useful for fading
    
    InitWindow(screenWidth, screenHeight, "raylib example 06b - raylib logo animation");
    
    SetTargetFPS(60);
    //--------------------------------------------------------------------------------------
    
    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        if (state == 0)                 // State 0: Small box blinking
        {
            framesCounter++;
        
            if (framesCounter == 120)
            {                
                state = 1;
                framesCounter = 0;      // Reset counter... will be used later...
            }
        }
        else if (state == 1)            // State 1: Top and left bars growing
        {
            topSideRecWidth += 4;
            leftSideRecHeight += 4;
            
            if (topSideRecWidth == 256) state = 2;
        }
        else if (state == 2)            // State 2: Bottom and right bars growing
        {
            bottomSideRecWidth += 4;
            rightSideRecHeight += 4;
            
            if (bottomSideRecWidth == 256) state = 3;
        }
        else if (state == 3)            // State 3: Letters appearing (one by one)
        {
            framesCounter++;
            
            if (framesCounter/12)       // Every 12 frames, one more letter!
            {    
                lettersCount++;
                framesCounter = 0;
            }
            
            switch (lettersCount)
            {
                case 1: raylib[0] = 'r'; break;
                case 2: raylib[1] = 'a'; break;
                case 3: raylib[2] = 'y'; break;
                case 4: raylib[3] = 'l'; break;
                case 5: raylib[4] = 'i'; break;
                case 6: raylib[5] = 'b'; break;
                default: break;
            }
            
            if (lettersCount >= 10)     // When all letters have appeared, just fade out everything
            {
                alpha -= 0.02;
                
                if (alpha <= 0)
                {
                    alpha = 0;
                    state = 4;
                }
            }
        }
        else if (state == 4)            // State 4: Reset and Replay
        {
            if (IsKeyPressed('R'))
            {
                framesCounter = 0;
                lettersCount = 0;
    
                topSideRecWidth = 16;
                leftSideRecHeight = 16;
    
                bottomSideRecWidth = 16;
                rightSideRecHeight = 16;
    
                for (int i = 0; i < 8; i++) raylib[i] = ' ';
                alpha = 1.0;

                state = 0;      // Return to State 0
            }
        }
        //----------------------------------------------------------------------------------
        
        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();
        
            ClearBackground(RAYWHITE);
            
            if (state == 0)
            {
                if ((framesCounter/15)%2) DrawRectangle(logoPositionX, logoPositionY, 16, 16, BLACK);
            }
            else if (state == 1)
            {
                DrawRectangle(logoPositionX, logoPositionY, topSideRecWidth, 16, BLACK);
                DrawRectangle(logoPositionX, logoPositionY, 16, leftSideRecHeight, BLACK);
            }
            else if (state == 2)
            {
                DrawRectangle(logoPositionX, logoPositionY, topSideRecWidth, 16, BLACK);
                DrawRectangle(logoPositionX, logoPositionY, 16, leftSideRecHeight, BLACK);
                
                DrawRectangle(logoPositionX + 240, logoPositionY, 16, rightSideRecHeight, BLACK);
                DrawRectangle(logoPositionX, logoPositionY + 240, bottomSideRecWidth, 16, BLACK);
            }
            else if (state == 3)
            {
                DrawRectangle(logoPositionX, logoPositionY, 256, 256, Fade(BLACK, alpha));
                DrawRectangle(screenWidth/2 - 112, screenHeight/2 - 112, 224, 224, Fade(RAYWHITE, alpha));
                
                DrawText(raylib, 356, 273, 50, Fade(BLACK, alpha));
            }
            else if (state == 4)
            {
                DrawText("[R] REPLAY", 340, 200, 20, GRAY);
            }
        
        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    CloseWindow();        // Close window and OpenGL context
    //--------------------------------------------------------------------------------------
    
    return 0;
}