sdllabel.cpp

游戏开发数据结构Data Structures for Game Programmers

// ============================================================================
// Data Structures For Game Programmers
// Ron Penton
// SDLLabel.h
// This is a basic SDLGUI library that I've set up for use with the game demos
// I've used in the book.
// ============================================================================
#include "SDLLabel.h"



// -------------------------------------------------------
// Name:        SDLLabel::SDLLabel
// Description: This constructs the label
// Arguments:   - p_x: x coordinate
//              - p_y: y coordinate
//              - p_text: the text of the label
//              - p_tforecol: the foreground color of the 
//                            text
//              - p_tbackcol: the background color of the
//                            text
//              - p_font: the font of the label.
// -------------------------------------------------------
SDLLabel::SDLLabel( int p_x, int p_y,
                    const char* p_text, 
                    SDL_Color p_tforecol,
                    SDL_Color p_tbackcol,
                    TTF_Font* p_font )
{
    // load the text.
    m_text = TTF_RenderText_Shaded( p_font, p_text, p_tforecol, p_tbackcol );
    SDL_SetColorKey( m_text, 
                     SDL_SRCCOLORKEY, 
                     SDL_MapRGB( m_text->format, 
                                 p_tbackcol.r,
                                 p_tbackcol.g,
                                 p_tbackcol.b ) );

    m_x = p_x;
    m_y = p_y;
}


// ----------------------------------------------------------------
//  Name:           Draw
//  Description:    draws the item on a surface
//  Arguments:      p_dest: the destination surface
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::Draw( SDL_Surface* p_dest )
{
    SDLBlit( m_text, p_dest, m_x, m_y );
}

// ----------------------------------------------------------------
//  Name:           ClickDown
//  Description:    Tells the item that it was clicked on.
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::ClickDown()
{
    // do nothing
}

// ----------------------------------------------------------------
//  Name:           ClickUp
//  Description:    Tells the item that it a mouse was released
//                  on this item
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::ClickUp()
{
    // do nothing
}

// ----------------------------------------------------------------
//  Name:           IsOver
//  Description:    determines if a set of coordinates is over this
//                  item
//  Arguments:      p_x, p_y: the coordinates
//  Return Value:   true if the coordinates are over this item
// ----------------------------------------------------------------
bool SDLLabel::IsOver( int p_x, int p_y )
{
    if( p_x >= m_x && p_x < (m_x + m_text->w) )
    {
        if( p_y >= m_y && p_y < (m_y + m_text->h) )
        {
            return true;
        }
    }
    return false;
}


// ----------------------------------------------------------------
//  Name:           ResetOnUp
//  Description:    This tells the item to reset itself because
//                  the user unclicked the mouse (only valid
//                  for some items)
//  Arguments:      None
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::ResetOnUp()
{
    // do nothing
}



// -------------------------------------------------------
// Name:        SDLLabel::CanGetFocus
// Description: determines if this object can get the 
//              focus of the GUI.
// Arguments:   None.
// Return Value: True or False
// -------------------------------------------------------
bool SDLLabel::CanGetFocus()
{
    // in our GUI, labels cannot get the focus.
    return false;
}

// ----------------------------------------------------------------
//  Name:           GetFocus
//  Description:    tells the item to get the focus or not.
//  Arguments:      p_focus: true if the item gets the focus
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::GetFocus( bool p_focus )
{
    // do nothing
    return;
}


// ----------------------------------------------------------------
//  Name:           KeyPress
//  Description:    tells the GUI that a key was pressed when this
//                  item was in focus
//  Arguments:      p_key: the that was pressed
//                  p_mod: the keyboard modifier flag (shift, alt, 
//                         control).
//                  p_char: the UNICODE representation of the key
//  Return Value:   None
// ----------------------------------------------------------------
void SDLLabel::KeyPress( SDLKey p_key, SDLMod p_mod, Uint16 p_char )
{
    return;
}