// $Id: mapsprite.cc,v 1.4 2006/08/05 09:08:59 matthew Exp $

//  Fish Supper
//  Copyright (C) 2006 Matthew Clarke <matthew_larcke@lycos.co.uk>
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
// 
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
//  02111-1307, USA.




#include "mapsprite.h"




// ************************
// *** MEMBER FUNCTIONS ***
// ************************

// **************************************************

bool FS::MapSprite::adjust_rect(SDL_Rect * rect)
{
    if (rect->x >= SCREEN_WIDTH)    // SCREEN_WIDTH defined in enums.h
    {
        if ((rect->x + rect->w) > row_length_pixels)
        {
            rect->w = (rect->x + rect->w) - row_length_pixels;
            rect->x = 0;
        }
        else
        {
            return false;
        } // if ... else
    }
    else if ((rect->x + rect->w) > SCREEN_WIDTH)
    {
        rect->w = SCREEN_WIDTH - rect->x;
    } // if ... else
    
    return true;
    
} // FS::MapSprite::adjust_rect()

// **************************************************

// Assigns 'screen' x to the sprite's x variable. N.B. This value
// will always be >= 0. 
void FS::MapSprite::calc_x(int current_start_pixel)
{
    if (current_start_pixel <= map_x)
    {
        x = map_x - current_start_pixel;
    }
    else
    {
        x = (row_length_pixels - current_start_pixel) + map_x;
    } // if ... else
    
} // FS::MapSprite::calc_screen_x()    
        
// **************************************************

void FS::MapSprite::calc_sprite_rect()
{
    sprite_rect.x = x;
    sprite_rect.w = width;  
    if (((sprite_rect.x + width) > row_length_pixels) || 
            (sprite_rect.x < SCREEN_WIDTH))
    {
        sprite_visible = true;
        // If sprite's x is off-screen, adjust this value so that it's
        // negative. It can then be used by SDL_BlitSurface().
        if (sprite_rect.x >= SCREEN_WIDTH)
        {
            sprite_rect.x -= row_length_pixels;
        } // if
    }
    else
    {
        sprite_visible = false;
    } // if ... else

} // FS::MapSprite::calc_sprite_rect()

// **************************************************
// **************************************************
// **************************************************
// **************************************************