/elec/propeller-clock

/*

 * text.cc

 *

 * 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/>.

 */

#include "text.h"

#include "text_renderer.h"

#include "config.h"

#include "Arduino.h"

#include <avr/pgmspace.h>

// the buffer for the message

char Text::_messages[ NUM_MESSAGE_BUFFERS ][ MESSAGE_BUFFER_LEN ];

// message buffer lengths

static int _message_lens[ NUM_MESSAGE_BUFFERS ];

// the mode that each message represents

static char _message_modes[ NUM_MESSAGE_BUFFERS ];

// mode-specific message parameters

static signed long _message_params[ NUM_MESSAGE_BUFFERS ];

// time last frame

static unsigned long _last_millis;

// duration last frame (in case we can't calculate it this frame!)

static unsigned long _duration;

// recalculate message params, based on _duration

static bool _do_draw_reset;

// recalculate messages parameters (after message reset)

static unsigned char _message_recalc_flags;

void reset_message_param( int message_num )

{

	if( _message_modes[ message_num ] & Text::MODE_HSCROLL )

	{

		switch( _message_modes[ message_num ] & 0x1c )

		{

		case Text::MODE_ONEQUARTER:

			_message_params[ message_num ] = -NUM_SEGMENTS / 4; break;

		case Text::MODE_ONETHIRD:

			_message_params[ message_num ] = -NUM_SEGMENTS / 3; break;

		case Text::MODE_HALF:

			_message_params[ message_num ] = -NUM_SEGMENTS / 2; break;

		case Text::MODE_TWOTHIRDS:

			_message_params[ message_num ] = -NUM_SEGMENTS * 2 / 3; break;

		case Text::MODE_THREEQUARTERS:

			_message_params[ message_num ] = -NUM_SEGMENTS * 3 / 4; break;

		case Text::MODE_ALL:

			_message_params[ message_num ] = -NUM_SEGMENTS; break;

		}

	}

	else

	{

		switch( _message_modes[ message_num ] & 0x1c )

		{

		case Text::MODE_ONEQUARTER:

			_message_params[ message_num ] = NUM_SEGMENTS / 4; break;

		case Text::MODE_ONETHIRD:

			_message_params[ message_num ] = NUM_SEGMENTS / 3; break;

		case Text::MODE_HALF:

			_message_params[ message_num ] = NUM_SEGMENTS / 2; break;

		case Text::MODE_TWOTHIRDS:

			_message_params[ message_num ] = NUM_SEGMENTS * 2 / 3; break;

		case Text::MODE_THREEQUARTERS:

			_message_params[ message_num ] = NUM_SEGMENTS * 3 / 4; break;

		case Text::MODE_ALL:

			_message_params[ message_num ] = NUM_SEGMENTS; break;

		}

		_message_params[ message_num ] = -( _message_params[ message_num ] -

			TextRenderer::get_width( _message_lens[ message_num ] ) ) / 2;

	}

}

void Text::set_message( int message_num, PString &pstring )

{

	// update message

	_message_lens[ message_num ] = pstring.length();

}

void Text::reset_message( int message_num, char mode )

{

	_message_modes[ message_num ] = mode;

	_message_recalc_flags |= 1 << message_num;

}

void Text::reset()

{

	// reset renderer

	_duration = 0;

	_last_millis = ::millis();

	_do_draw_reset = false;

	_message_recalc_flags = 0;

	// reset the text renderer's output buffer

	TextRenderer::reset_buffer();

}

void Text::draw_reset()

{

	// how many milliseconds have elapsed since last frame?

	unsigned long millis = ::millis();

	if( millis > _last_millis )

		_duration = millis - _last_millis;

	_last_millis = millis;

	_do_draw_reset = true;

}

void Text::draw( int message_num, int segment )

{

	TextRenderer::buffer_in_use();

	// perform a mid-frame reset, as necessary

	if( _do_draw_reset && segment > NUM_SEGMENTS / 2 ) {

		_do_draw_reset = false;

		// reset message param?

		if( _message_recalc_flags & ( 1 << message_num ) ) {

			_message_recalc_flags &= ~( 1 << message_num );

			reset_message_param( message_num );

		}

		// add to horizontal scroll position

		if( _message_modes[ message_num ] & MODE_HSCROLL ) {

			_message_params[ message_num ] +=

				_duration * TEXT_SCROLL_SPEED / 1000;

			long excess = _message_params[ message_num ] -

				TextRenderer::get_width( _message_lens[ message_num ] );

			if( excess >= 0 ) {

				reset_message_param( message_num );

				_message_params[ message_num ] += excess;

			}

		}

	}

	// calculate the width

	int width;

	switch( _message_modes[ message_num ] & 0x1c )

	{

	case MODE_ONEQUARTER:

		width = NUM_SEGMENTS / 4;

		break;

	case MODE_ONETHIRD:

		width = NUM_SEGMENTS / 3;

		break;

	case MODE_HALF:

		width = NUM_SEGMENTS / 2;

		break;

	case MODE_TWOTHIRDS:

		width = NUM_SEGMENTS * 2 / 3;

		break;

	case MODE_THREEQUARTERS:

		width = NUM_SEGMENTS * 3 / 4;

		break;

	case MODE_ALL:

		width = NUM_SEGMENTS;

		break;

	}

	// convert segment to display-space

	switch( _message_modes[ message_num ] & 0x03 )

	{

	case MODE_TOP:

		if( segment < width / 2 )

			segment += width / 2;

		else if( segment >= NUM_SEGMENTS - width / 2 )

			segment -= ( NUM_SEGMENTS - width / 2 );

		else

			return;

		break;

	case MODE_BOTTOM:

		if( segment > ( NUM_SEGMENTS - width ) / 2 &&

			segment < ( NUM_SEGMENTS - width ) / 2 + width )

		{

			segment = width - ( segment - ( NUM_SEGMENTS - width ) / 2 );

		}		

		else

			return;

		break;

	}

	// render

	TextRenderer::render(

		_messages[ message_num ], _message_lens[ message_num ],

		(long)segment + _message_params[ message_num ],

		( _message_modes[ message_num ] & 1 ) == 0, 0 );

}