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* Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
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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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* 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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* 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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* 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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#include "text_renderer.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_pos[ NUM_MESSAGE_BUFFERS ];
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// text scaling factors
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static char _message_scale[ NUM_MESSAGE_BUFFERS ];
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static unsigned long _last_millis;
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// duration last frame (in case we can't calculate it this frame!)
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static unsigned long _duration;
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// recalculate message params, based on _duration
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static bool _do_draw_reset;
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#define MASK_MODE_SIZE 0x07
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#define MASK_MODE_POS 0x40
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void reset_message_pos( int message_num )
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if( _message_modes[ message_num ] & Text::MODE_HSCROLL )
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switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
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case Text::MODE_ONEQUARTER:
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_message_pos[ message_num ] = -NUM_SEGMENTS / 4; break;
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case Text::MODE_ONETHIRD:
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_message_pos[ message_num ] = -NUM_SEGMENTS / 3; break;
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_message_pos[ message_num ] = -NUM_SEGMENTS / 2; break;
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case Text::MODE_TWOTHIRDS:
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_message_pos[ message_num ] = -NUM_SEGMENTS * 2 / 3; break;
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case Text::MODE_THREEQUARTERS:
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_message_pos[ message_num ] = -NUM_SEGMENTS * 3 / 4; break;
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_message_pos[ message_num ] = -NUM_SEGMENTS; break;
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switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
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case Text::MODE_ONEQUARTER:
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_message_pos[ message_num ] = NUM_SEGMENTS / 4; break;
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case Text::MODE_ONETHIRD:
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_message_pos[ message_num ] = NUM_SEGMENTS / 3; break;
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_message_pos[ message_num ] = NUM_SEGMENTS / 2; break;
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case Text::MODE_TWOTHIRDS:
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_message_pos[ message_num ] = NUM_SEGMENTS * 2 / 3; break;
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case Text::MODE_THREEQUARTERS:
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_message_pos[ message_num ] = NUM_SEGMENTS * 3 / 4; break;
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_message_pos[ message_num ] = NUM_SEGMENTS; break;
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_message_pos[ message_num ] = -( _message_pos[ message_num ] -
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TextRenderer::get_width( _message_lens[ message_num ],
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_message_scale[ message_num ] ) ) / 2;
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_last_millis = ::millis();
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// clear all message modes (disable messages)
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for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
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_message_modes[ a ] = 0;
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// reset the text renderer's output buffer
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TextRenderer::reset_buffer();
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void Text::set_up_message( int message_num, char mode, char scale )
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_message_modes[ message_num ] = mode;
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_message_scale[ message_num ] = scale;
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// horizontal scrolling messages need their position reset at start of mode
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if( _message_modes[ message_num ] & MODE_HSCROLL )
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reset_message_pos( message_num );
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void Text::set_message_text( int message_num, PString &pstring )
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_message_lens[ message_num ] = pstring.length();
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// non-horizontal scrolling modes need their position reset whenever the
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if( !( _message_modes[ message_num ] & MODE_HSCROLL ) )
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reset_message_pos( message_num );
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void Text::draw_reset()
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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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// we'll need to recalculate params for the frame, but we want to do it when
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// we're not in the middle of a text display (to avoid tearing).
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_do_draw_reset = true;
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static void draw_message( int message_num, int segment )
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TextRenderer::buffer_in_use();
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// calculate the width
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switch( _message_modes[ message_num ] & MASK_MODE_SIZE )
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case Text::MODE_ONEQUARTER:
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width = NUM_SEGMENTS / 4;
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case Text::MODE_ONETHIRD:
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width = NUM_SEGMENTS / 3;
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case Text::MODE_HALF:
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width = NUM_SEGMENTS / 2;
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case Text::MODE_TWOTHIRDS:
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width = NUM_SEGMENTS * 2 / 3;
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case Text::MODE_THREEQUARTERS:
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width = NUM_SEGMENTS * 3 / 4;
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width = NUM_SEGMENTS;
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// convert segment to display-space
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switch( _message_modes[ message_num ] & MASK_MODE_POS )
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if( segment < width / 2 )
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segment += width / 2;
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else if( segment >= NUM_SEGMENTS - width / 2 )
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segment -= ( NUM_SEGMENTS - width / 2 );
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case Text::MODE_BOTTOM:
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if( segment > ( NUM_SEGMENTS - width ) / 2 &&
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segment < ( NUM_SEGMENTS - width ) / 2 + width )
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segment = width - ( segment - ( NUM_SEGMENTS - width ) / 2 );
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TextRenderer::render(
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Text::_messages[ message_num ], _message_lens[ message_num ],
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(long)segment + _message_pos[ message_num ],
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( _message_modes[ message_num ] & MASK_MODE_POS ) == Text::MODE_BOTTOM,
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0, _message_scale[ message_num ] );
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void Text::draw( int segment )
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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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// go through the messages looking for an active one
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for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
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if( _message_modes[ a ] & MASK_MODE_SIZE )
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// add to horizontal scroll position
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if( _message_modes[ a ] & Text::MODE_HSCROLL ) {
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_duration * TEXT_SCROLL_SPEED / 1000;
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long excess = _message_pos[ a ] -
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TextRenderer::get_width( _message_lens[ a ],
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_message_scale[ a ] );
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reset_message_pos( a );
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_message_pos[ a ] += excess;
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// draw any active messages
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for( int a = 0; a < NUM_MESSAGE_BUFFERS; a++ )
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if( _message_modes[ a ] & MASK_MODE_SIZE )
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draw_message( a, segment );
added
removed
src/text.cc
