/*******************************************************************************************
*
*   raylib [textures] example - sprite explosion
*
*   This example has been created using raylib 2.5 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2019 Anata and Ramon Santamaria (@raysan5)
*   Copyright (c) 2022 Roy Qu (royqh1979@gmail.com) 
*
********************************************************************************************/

#include <raylib.h>

#define NUM_FRAMES_PER_LINE     5
#define NUM_LINES               5

int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [textures] example - sprite explosion");

    InitAudioDevice();

    // Load explosion sound
    Sound fxBoom = LoadSound("boom.wav");

    // Load explosion texture
    Texture2D explosion = LoadTexture("explosion.png");

    // Init variables for animation
    float frameWidth = (float)(explosion.width/NUM_FRAMES_PER_LINE);   // Sprite one frame rectangle width
    float frameHeight = (float)(explosion.height/NUM_LINES);           // Sprite one frame rectangle height
    int currentFrame = 0;
    int currentLine = 0;

    Rectangle frameRec = { 0, 0, frameWidth, frameHeight };
    Vector2 position = { 0.0f, 0.0f };

    bool active = false;
    int framesCounter = 0;

    SetTargetFPS(120);
    SetTraceLogLevel(LOG_WARNING);
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------

        // Check for mouse button pressed and activate explosion (if not active)
        if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) )
        {
            position = GetMousePosition();
            active = true;

            position.x -= frameWidth/2.0f;
            position.y -= frameHeight/2.0f;

            PlaySound(fxBoom);
        }

        // Compute explosion animation frames
        if (active)
        {
            framesCounter++;

            if (framesCounter > 2)
            {
                currentFrame++;

                if (currentFrame >= NUM_FRAMES_PER_LINE)
                {
                    currentFrame = 0;
                    currentLine++;

                    if (currentLine >= NUM_LINES)
                    {
                        currentLine = 0;
                        active = false;
                    }
                }

                framesCounter = 0;
            }
        }

        frameRec.x = frameWidth*currentFrame;
        frameRec.y = frameHeight*currentLine;
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            // Draw explosion required frame rectangle
            if (active) DrawTextureRec(explosion, frameRec, position, WHITE);

			DrawText("Click to explode!", 440, 400, 40, DARKGRAY);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadTexture(explosion);   // Unload texture
    UnloadSound(fxBoom);        // Unload sound

    CloseAudioDevice();

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}