OpenChargeMicro/Software/src/ws2812/fadelinear.cpp

69 lines
2.0 KiB
C++

/*
* A library for avr microcontrollers to control WS2812 leds
*
* Copyright (C) 2016 Markus Schmidl
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation;
* either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with this program;
* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include "color.h"
#include "ws2812_avr_macros.h"
FadeLinear::FadeLinear(Color &cFrom, Color &cTo, uint16_t stepCount, color_fade_dir_t fadeDir) : step_count(stepCount), cCur(cFrom), cur_step(0)
{
float h_step_;
h_step_ = cTo.h - cFrom.h;
switch (fadeDir) {
case shortest:
if (fabs(h_step_) > 180.0)
h_step_ = _change_pos_neg(h_step_) * _360_min_fabs(h_step_);
break;
case longest:
if (fabs(h_step_) < 180.0)
h_step_ = _change_pos_neg(h_step_) * _360_min_fabs(h_step_);
break;
case clockwise:
if (h_step_ < 0.0)
h_step_ = _360_min_fabs(h_step_);
break;
case counter_clockwise:
if (h_step_ > 0.0)
h_step_ = -1.0 * _360_min_fabs(h_step_);
break;
}
h_step = h_step_ / (float)step_count;
s_step = (cTo.s - cFrom.s) / (float)step_count;
i_step = (cTo.i - cFrom.i) / (float)step_count;
}
FadeLinear::FadeLinear(Color &cFrom, Color &cTo, uint16_t stepCount) : FadeLinear(cFrom, cTo, stepCount, shortest)
{
}
uint8_t FadeLinear::next(void)
{
if (cur_step++ < step_count) {
cCur.hsi2rgb(cCur.h + h_step, cCur.s + s_step, cCur.i + i_step);
return 1;
}
return 0;
}
Color FadeLinear::get_cur_color(void)
{
return cCur;
}