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/* Copyright 2021 HorrorTroll <https://github.com/HorrorTroll>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
extern HSV gradient_0;
extern HSV gradient_100;
extern bool reflected_gradient;
static HSV INTERPOLATE_HSV(float step, HSV gradient_0, HSV gradient_100) {
uint8_t cw, ccw;
HSV color;
cw = (gradient_0.h >= gradient_100.h) ? 255 + gradient_100.h - gradient_0.h : gradient_100.h - gradient_0.h; // Hue range is 0 to 255.
ccw = (gradient_0.h >= gradient_100.h) ? gradient_0.h - gradient_100.h : 255 + gradient_0.h - gradient_100.h;
if( cw < ccw ) { // going clockwise
color.h = gradient_0.h + (uint8_t)(step * cw);
} else { // Going counter clockwise
color.h = gradient_0.h - (uint8_t)(step * ccw);
}
color.s = gradient_0.s + step * (gradient_100.s - gradient_0.s);
// Scale V with global RGB Matrix's V, so users can still control overall brightness with RGB_VAI & RGB_VAD0
color.v = round((gradient_0.v + step * (gradient_100.v - gradient_0.v)) * ((float)rgb_matrix_config.hsv.v / 255));
return color;
}
static HSV CUSTOM_GRADIENT_math(uint8_t led_x, uint8_t min_x, uint8_t max_x) {
float step = (float)led_x / (max_x - min_x);
float mid_gradient_pos = 0.5;
if( reflected_gradient ) {
if( step <= mid_gradient_pos ) {
return INTERPOLATE_HSV(step * (1/mid_gradient_pos), gradient_0, gradient_100);
} else {
return INTERPOLATE_HSV((step - mid_gradient_pos) * (1/(1-mid_gradient_pos)), gradient_100, gradient_0);
}
} else {
return INTERPOLATE_HSV(step, gradient_0, gradient_100);
}
}
static bool CUSTOM_GRADIENT(effect_params_t* params) {
RGB_MATRIX_USE_LIMITS(led_min, led_max);
uint8_t min_x = 0; // X coordinate of the left-most LED
uint8_t max_x = 224; // X coordinate of the right-most LED
for (uint8_t i = led_min; i < led_max; i++) {
RGB_MATRIX_TEST_LED_FLAGS();
HSV hsv_orig = CUSTOM_GRADIENT_math(g_led_config.point[i].x, min_x, max_x);
RGB rgb = hsv_to_rgb(hsv_orig);
rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
}
return led_max < RGB_MATRIX_LED_COUNT;
}
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