source/presentation/Screen.cpp

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#include "Screen.h"

Screen::Screen(unsigned int screenWidth, unsigned int screenHeight, bool fullscreen)
    :_exitClicked(false),
    _screenWidth(screenWidth),
    _screenHeight(screenHeight),
    _gameAreaWidth(_screenWidth*0.75),
    _infoPanelWidth(_screenWidth - _gameAreaWidth)
{
    if (fullscreen)
    {
        al_set_new_display_flags(ALLEGRO_FULLSCREEN_WINDOW);
        if (!resolutionSupported())
        {
            al_show_native_message_box(NULL, "Fatal error", "Fatal error", "The fullscreen resolution specified in config.txt is not supported by your system. Please open config.txt and change the resolution to a supported resolution, or change fullscreen to false.", NULL, ALLEGRO_MESSAGEBOX_ERROR);
            throw BadResolution();
        }
    }
    else
    {
        al_set_new_display_flags(ALLEGRO_WINDOWED);
        //need to add error checking for windows that are way too big
    }

    al_set_new_display_option(ALLEGRO_VSYNC, 1, ALLEGRO_SUGGEST);

    _display = al_create_display(_screenWidth, _screenHeight);

    al_hide_mouse_cursor(_display);
    _windowEvents = al_create_event_queue();
    al_register_event_source(_windowEvents, al_get_display_event_source(_display));
    //used so that ESC can be pressed to exit.
    al_register_event_source(_windowEvents, al_get_keyboard_event_source());

    _font = al_load_font("junction 02.ttf", _screenWidth/10, 0);
    if (_font == NULL)
    {
        al_show_native_message_box(NULL, "Fatal error", "Fatal error", "The file 'junction 02.ttf' was not found. Ensure that it is located in the working directory.", NULL, ALLEGRO_MESSAGEBOX_ERROR);
        al_destroy_event_queue(_windowEvents);
        al_destroy_display(_display);
        throw InstallFailure();
    }

    ALLEGRO_BITMAP* front = al_get_backbuffer(_display);
    al_flip_display();
    ALLEGRO_BITMAP* back = al_get_backbuffer(_display);

    _panels.push_back(new GamePanel(back, front, 0, 0, _gameAreaWidth, _screenHeight));
    _panels.push_back(new InfoPanel(back, front, _gameAreaWidth, 0, _infoPanelWidth, _screenHeight));
}

Screen::~Screen()
{
    for (vector<ScreenPanel*>::iterator iter = _panels.begin(); iter!=_panels.end(); ++iter)
    {
        delete (*iter);
    }
    _panels.clear();

    al_destroy_font(_font);
    al_destroy_event_queue(_windowEvents);
    al_destroy_display(_display);
}

string Screen::getLevel()
{
    string result("");
    ALLEGRO_FILECHOOSER* filechooser = al_create_native_file_dialog(".", "Choose your level", "*.lvl",ALLEGRO_FILECHOOSER_FILE_MUST_EXIST);
    al_show_native_file_dialog(_display, filechooser);
    if (al_get_native_file_dialog_count(filechooser)==0)
    {
        _exitClicked = true;
    }
    else
    {
        result = al_get_native_file_dialog_path(filechooser, 0);
    }

    al_destroy_native_file_dialog(filechooser);
    return result;
}

void Screen::draw(const Maze& maze, const list<PlayerCar>& players, const list<EnemyCar>& enemies, const list<Checkpoint>& checkpoints, const list<Rock>& rocks, const list<Smokescreen>& smokescreens, const list<DestroyedObjectPopup>& popups)
{
    for (vector<ScreenPanel*>::iterator iter =  _panels.begin(); iter!=_panels.end(); ++iter)
    {
        (*iter)->draw(maze, players, enemies, checkpoints, rocks, smokescreens, popups);
    }
    flip();
}

void Screen::flip()
{
    al_flip_display();
    for (vector<ScreenPanel*>::iterator iter =  _panels.begin(); iter!=_panels.end(); ++iter)
    {
        (*iter)->flip();
    }
}

void Screen::drawWin()
{
    flip();

    ALLEGRO_COLOR transBlack = al_map_rgba(0,0,0,200);
    al_draw_filled_rectangle(0,0,_screenWidth,_screenHeight, transBlack);

    ALLEGRO_COLOR textColour = al_map_rgb(255,255,255);
    al_draw_text(_font, textColour, _screenWidth/2, _screenHeight/2, ALLEGRO_ALIGN_CENTRE , "You win!");

    flip();
}

void Screen::drawLoss()
{
    flip();

    ALLEGRO_COLOR transBlack = al_map_rgba(0,0,0,200);
    al_draw_filled_rectangle(0,0,_screenWidth,_screenHeight, transBlack);

    ALLEGRO_COLOR textColour = al_map_rgb(255,255,255);
    al_draw_text(_font, textColour, _screenWidth/2, _screenHeight/2, ALLEGRO_ALIGN_CENTRE , "You lose!");

    flip();
}

bool Screen::exitClicked()
{
    if (_exitClicked) return true;

    ALLEGRO_EVENT event;
    while (al_get_next_event(_windowEvents, &event))
    {
        if (event.type==ALLEGRO_EVENT_DISPLAY_CLOSE || (event.type==ALLEGRO_EVENT_KEY_CHAR && event.keyboard.keycode==ALLEGRO_KEY_ESCAPE))
        {
            al_flush_event_queue(_windowEvents);
            _exitClicked = true;
            return true;
        }
    }

    return false;
}

bool Screen::resolutionSupported()
{
    ALLEGRO_DISPLAY_MODE mode;
    for (int i=0; i<al_get_num_display_modes(); ++i)
    {
        al_get_display_mode(i, &mode);

        if (static_cast<unsigned int>(mode.width)==_screenWidth && static_cast<unsigned int>(mode.height)==_screenHeight)
        {
            return true;
        }
    }

    return false;
}