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* Copyright (C) 2012 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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* Called once per segment to draw a column of LEDs.
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* @param segment the segment number to draw
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virtual void draw( int segment );
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* Called at the start of a "frame", before any segments are drawn.
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virtual void draw_reset();
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* Called when the mode is becoming active.
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virtual void activate();
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* Called when the mode is becoming inactive.
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virtual void deactivate();
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* Called when the button has been pressed.