69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
/*
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* A library for avr microcontrollers to control WS2812 leds
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*
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* Copyright (C) 2016 Markus Schmidl
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or (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, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <math.h>
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#include "color.h"
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#include "ws2812_avr_macros.h"
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FadeLinear::FadeLinear(Color &cFrom, Color &cTo, uint16_t stepCount, color_fade_dir_t fadeDir) : step_count(stepCount), cCur(cFrom), cur_step(0)
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{
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float h_step_;
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h_step_ = cTo.h - cFrom.h;
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switch (fadeDir) {
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case shortest:
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if (fabs(h_step_) > 180.0)
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h_step_ = _change_pos_neg(h_step_) * _360_min_fabs(h_step_);
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break;
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case longest:
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if (fabs(h_step_) < 180.0)
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h_step_ = _change_pos_neg(h_step_) * _360_min_fabs(h_step_);
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break;
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case clockwise:
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if (h_step_ < 0.0)
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h_step_ = _360_min_fabs(h_step_);
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break;
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case counter_clockwise:
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if (h_step_ > 0.0)
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h_step_ = -1.0 * _360_min_fabs(h_step_);
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break;
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}
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h_step = h_step_ / (float)step_count;
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s_step = (cTo.s - cFrom.s) / (float)step_count;
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i_step = (cTo.i - cFrom.i) / (float)step_count;
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}
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FadeLinear::FadeLinear(Color &cFrom, Color &cTo, uint16_t stepCount) : FadeLinear(cFrom, cTo, stepCount, shortest)
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{
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}
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uint8_t FadeLinear::next(void)
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{
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if (cur_step++ < step_count) {
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cCur.hsi2rgb(cCur.h + h_step, cCur.s + s_step, cCur.i + i_step);
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return 1;
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}
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return 0;
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}
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Color FadeLinear::get_cur_color(void)
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{
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return cCur;
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}
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