/elec/propeller-clock

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  • Committer: edam
  • Date: 2012-01-26 23:54:36 UTC
  • Revision ID: edam@waxworlds.org-20120126235436-mlq6e00q6rxqudy2
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src/text.cc
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/*
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 * text.cc
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 *
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 * Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
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 *
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 * This file is part of propeller-clock (hereafter referred to as "this
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 * program"). See http://ed.am/dev/software/arduino/propeller-clock for more
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 * information.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU Lesser General Public License as published
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 * by the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#include "text.h"
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#include "text_renderer.h"
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#include "config.h"
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#include "Arduino.h"
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#include <avr/pgmspace.h>
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// the buffer for the message
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char Text::_messages[ NUM_MESSAGE_BUFFERS ][ MESSAGE_BUFFER_LEN ];
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// message buffer lengths
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static int _message_lens[ NUM_MESSAGE_BUFFERS ];
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// the mode that each message represents
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static char _message_modes[ NUM_MESSAGE_BUFFERS ];
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// mode-specific message parameters
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static signed long _message_params[ NUM_MESSAGE_BUFFERS ];
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42
 
// time last frame
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static unsigned long _last_millis;
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45
 
// duration last frame (in case we can't calculate it this frame!)
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static unsigned long _duration;
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48
 
// recalculate message params, based on _duration
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static bool _do_draw_reset;
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51
 
 
52
 
void reset_message_param( int message_num )
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{
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        if( _message_modes[ message_num ] & Text::MODE_HSCROLL )
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        {
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                switch( _message_modes[ message_num ] & 0x1c )
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                {
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                case Text::MODE_ONEQUARTER:
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                        _message_params[ message_num ] = -NUM_SEGMENTS / 4; break;
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                case Text::MODE_ONETHIRD:
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                        _message_params[ message_num ] = -NUM_SEGMENTS / 3; break;
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                case Text::MODE_HALF:
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                        _message_params[ message_num ] = -NUM_SEGMENTS / 2; break;
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                case Text::MODE_TWOTHIRDS:
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                        _message_params[ message_num ] = -NUM_SEGMENTS * 2 / 3; break;
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                case Text::MODE_THREEQUARTERS:
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                        _message_params[ message_num ] = -NUM_SEGMENTS * 3 / 4; break;
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                case Text::MODE_ALL:
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                        _message_params[ message_num ] = -NUM_SEGMENTS; break;
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                }
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        }
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        else
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        {
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                switch( _message_modes[ message_num ] & 0x1c )
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                {
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                case Text::MODE_ONEQUARTER:
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                        _message_params[ message_num ] = NUM_SEGMENTS / 4; break;
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                case Text::MODE_ONETHIRD:
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                        _message_params[ message_num ] = NUM_SEGMENTS / 3; break;
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                case Text::MODE_HALF:
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                        _message_params[ message_num ] = NUM_SEGMENTS / 2; break;
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                case Text::MODE_TWOTHIRDS:
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                        _message_params[ message_num ] = NUM_SEGMENTS * 2 / 3; break;
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                case Text::MODE_THREEQUARTERS:
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                        _message_params[ message_num ] = NUM_SEGMENTS * 3 / 4; break;
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                case Text::MODE_ALL:
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                        _message_params[ message_num ] = NUM_SEGMENTS; break;
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                }
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                _message_params[ message_num ] = -( _message_params[ message_num ] -
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                        TextRenderer::get_width( _message_lens[ message_num ] ) ) / 2;
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        }
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}
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void Text::set_message( int message_num, PString &pstring )
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{
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        // update message
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        _message_lens[ message_num ] = pstring.length();
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}
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void Text::reset_message( int message_num, char mode )
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{
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        _message_modes[ message_num ] = mode;
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        reset_message_param( message_num );
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}
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void Text::reset()
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{
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        // reset renderer
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        _duration = 0;
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        _last_millis = ::millis();
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        _do_draw_reset = false;
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        // reset the text renderer's output buffer
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        TextRenderer::reset_buffer();
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}
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void Text::draw_reset()
122
 
{
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        // how many milliseconds have elapsed since last frame?
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        unsigned long millis = ::millis();
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        if( millis > _last_millis )
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                _duration = millis - _last_millis;
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        _last_millis = millis;
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        _do_draw_reset = true;
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}
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132
 
 
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void Text::draw( int message_num, int segment )
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{
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        // perform a mid-frame reset, as necessary
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        if( _do_draw_reset && segment > NUM_SEGMENTS / 2 ) {
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                _do_draw_reset = false;
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                if( _message_modes[ message_num ] & MODE_HSCROLL )
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                {
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                        // add to horizontal scroll position
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                        _message_params[ message_num ] +=
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                                _duration * TEXT_SCROLL_SPEED / 1000;
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                        long excess = _message_params[ message_num ] -
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                                TextRenderer::get_width( _message_lens[ message_num ] );
146
 
                        if( excess >= 0 ) {
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                                reset_message_param( message_num );
148
 
                                _message_params[ message_num ] += excess;
149
 
                        }
150
 
                }
151
 
        }
152
 
 
153
 
        // calculate the width
154
 
        int width;
155
 
        switch( _message_modes[ message_num ] & 0x1c )
156
 
        {
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        case MODE_ONEQUARTER:
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                width = NUM_SEGMENTS / 4;
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                break;
160
 
        case MODE_ONETHIRD:
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                width = NUM_SEGMENTS / 3;
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                break;
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        case MODE_HALF:
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                width = NUM_SEGMENTS / 2;
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                break;
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        case MODE_TWOTHIRDS:
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                width = NUM_SEGMENTS * 2 / 3;
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                break;
169
 
        case MODE_THREEQUARTERS:
170
 
                width = NUM_SEGMENTS * 3 / 4;
171
 
                break;
172
 
        case MODE_ALL:
173
 
                width = NUM_SEGMENTS;
174
 
                break;
175
 
        }
176
 
 
177
 
        // convert segment to display-space
178
 
        switch( _message_modes[ message_num ] & 0x03 )
179
 
        {
180
 
        case MODE_TOP:
181
 
                if( segment < width / 2 )
182
 
                        segment += width / 2;
183
 
                else if( segment >= NUM_SEGMENTS - width / 2 )
184
 
                        segment -= ( NUM_SEGMENTS - width / 2 );
185
 
                else
186
 
                        return;
187
 
                break;
188
 
        case MODE_BOTTOM:
189
 
                if( segment > ( NUM_SEGMENTS - width ) / 2 &&
190
 
                        segment < ( NUM_SEGMENTS - width ) / 2 + width )
191
 
                {
192
 
                        segment = width - ( segment - ( NUM_SEGMENTS - width ) / 2 );
193
 
                }               
194
 
                else
195
 
                        return;
196
 
                break;
197
 
        }
198
 
 
199
 
        // render
200
 
        TextRenderer::render(
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                _messages[ message_num ], _message_lens[ message_num ],
202
 
                (long)segment + _message_params[ message_num ],
203
 
                ( _message_modes[ message_num ] & 1 ) == 0, 0 );
204
 
}