/* * 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 #include "color.h" #include "ws2812_avr_macros.h" FadeThroughIAxis::FadeThroughIAxis(Color& cFrom, Color& cTo, uint16_t stepCount) : step_count(stepCount), cur_step(0), cCur(cFrom) { Color center; float deltaI, tri_i_s_from; deltaI = fabs(cFrom.i - cTo.i); tri_i_s_from = sqrt(pow(deltaI, 2) / 4 + pow(cFrom.s, 2)); from_step_count = tri_i_s_from / (tri_i_s_from + sqrt(pow(deltaI, 2) / 4 + pow(cTo.s, 2))) * step_count; to_step_count = step_count - from_step_count; center.i = fmin(cFrom.i, cTo.i) + deltaI / 2; center.h = 0.0; center.s = 0.0; float h_from_step_; /* shortest */ h_from_step_ = center.h - cFrom.h; if (fabs(h_from_step_) > 180.0) h_from_step_ = _change_pos_neg(h_from_step_) * _360_min_fabs(h_from_step_); h_from_step = h_from_step_ / (float)from_step_count; s_from_step = (center.s - cFrom.s) / (float)from_step_count; i_from_step = (center.i - cFrom.i) / (float)from_step_count; float h_to_step_; /* shortest */ h_to_step_ = cTo.h - center.h; if (fabs(h_to_step_) > 180.0) h_to_step_ = _change_pos_neg(h_to_step_) * _360_min_fabs(h_to_step_); h_to_step = h_to_step_; s_to_step = (cTo.s - center.s) / (float)to_step_count; i_to_step = (cTo.i - center.i) / (float)to_step_count; } uint8_t FadeThroughIAxis::next(void) { if (cur_step++ < from_step_count) { cCur.hsi2rgb(cCur.h + h_from_step, cCur.s + s_from_step, cCur.i + i_from_step); return 1; } else if (cur_step++ < step_count) { cCur.hsi2rgb(cCur.h + h_to_step, cCur.s + s_to_step, cCur.i + i_to_step); return 1; } return 0; } Color FadeThroughIAxis::get_cur_color(void) { return cCur; }