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/*
* text_renderer.h
*
* Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
*
* This file is part of propeller-clock (hereafter referred to as "this
* program"). See http://ed.am/dev/software/arduino/propeller-clock for more
* information.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _TEXT_RENDERER_H_
#define _TEXT_RENDERER_H_
#include <PString.h>
#define MAX_MESSAGE_LENGTH 64
class TextRenderer
{
public:
/**
* Get singleton instance of text renderer.
*
* @return singleton instance
*/
static TextRenderer &get_instance();
/**
* Retrieve the PString that is used to render text with the intention of
* changing it. This resets the text services.
*
* @param message the message
*/
PString &get_pstring();
/**
* Call at the start of each frame.
*/
void draw_reset();
/**
* Draw segment using automatic scrolling.
*/
void draw_scroll( int segment );
protected:
TextRenderer();
/**
* Transform segment in to display-space.
*
* @param segment
* @return display-space segment
*/
int xform_segment( int segment );
/**
* Draw the specified column of pixels from the message
*
* @param x pixel column to draw
*/
void render( int x );
/**
* Get a pointer to the character data in the font for a given
* character.
*
* @param character to look-up
* @param glyph where to store the glyph data
*/
void get_glyph( char c, char *glyph );
/** the buffer for the message */
char _message_buffer[ MAX_MESSAGE_LENGTH ];
/** the current message */
PString _message;
/** glyph */
char _glyph_cache[ 8 ];
/** the character the current glyph is for */
char _glyph_cache_char;
/** selected font */
int _font;
/** time last frame */
unsigned long _last_millis;
/** duration last frame (in case we can't calculate it this
* frame!) */
unsigned long _duration;
/** scroll position (in segments ) */
signed long _scroll;
};
#endif //_TEXT_RENDERER_H_
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