From 4b74f985ec7b14f5517df4e591f0c36b24f85f5c Mon Sep 17 00:00:00 2001 From: Max Rumpf Date: Sun, 26 Jul 2020 01:00:33 +0200 Subject: Tweak the Christmas animation effect to be less harsh on the eyes (#7648) * Tweak the Christmas animation effect to be less harsh on the eyes * Further improve the tweaked Christmas animation code - Use constants where it makes sense - Instead of complicated math, use a static variable to keep track if it's animating from or to red - Don't use pow (but a simple macro instead) - Using floating point math is necessary for the fraction in the cubic bezier function to work * Update docs for the tweaked Christmas animation effect * Further improve memory usage - Don't use floats, but 32 bit ints instead (where needed) - Replace limits.h with constant * Fix typo --- quantum/rgblight.c | 31 +++++++++++++++++++++++++++---- quantum/rgblight.h | 2 +- 2 files changed, 28 insertions(+), 5 deletions(-) (limited to 'quantum') diff --git a/quantum/rgblight.c b/quantum/rgblight.c index f9e9da167..52d8da181 100644 --- a/quantum/rgblight.c +++ b/quantum/rgblight.c @@ -1163,16 +1163,39 @@ void rgblight_effect_knight(animation_status_t *anim) { #endif #ifdef RGBLIGHT_EFFECT_CHRISTMAS +# define CUBED(x) ((x) * (x) * (x)) + +/** + * Christmas lights effect, with a smooth animation between red & green. + */ void rgblight_effect_christmas(animation_status_t *anim) { - uint8_t hue; + static int8_t increment = 1; + const uint8_t max_pos = 32; + const uint8_t hue_green = 85; + + uint32_t xa; + uint8_t hue, val; uint8_t i; - anim->current_offset = (anim->current_offset + 1) % 2; + // The effect works by animating anim->pos from 0 to 32 and back to 0. + // The pos is used in a cubic bezier formula to ease-in-out between red and green, leaving the interpolated colors visible as short as possible. + xa = CUBED((uint32_t) anim->pos); + hue = ((uint32_t) hue_green) * xa / (xa + CUBED((uint32_t) (max_pos - anim->pos))); + // Additionally, these interpolated colors get shown with a slightly darker value, to make them less prominent than the main colors. + val = 255 - (3 * (hue < hue_green / 2 ? hue : hue_green - hue) / 2); + for (i = 0; i < rgblight_ranges.effect_num_leds; i++) { - hue = 0 + ((i / RGBLIGHT_EFFECT_CHRISTMAS_STEP + anim->current_offset) % 2) * 85; - sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i + rgblight_ranges.effect_start_pos]); + uint8_t local_hue = (i / RGBLIGHT_EFFECT_CHRISTMAS_STEP) % 2 ? hue : hue_green - hue; + sethsv(local_hue, rgblight_config.sat, val, (LED_TYPE *)&led[i + rgblight_ranges.effect_start_pos]); } rgblight_set(); + + if (anim->pos == 0) { + increment = 1; + } else if (anim->pos == max_pos) { + increment = -1; + } + anim->pos += increment; } #endif diff --git a/quantum/rgblight.h b/quantum/rgblight.h index 7b2696294..c3a9e94b7 100644 --- a/quantum/rgblight.h +++ b/quantum/rgblight.h @@ -142,7 +142,7 @@ enum RGBLIGHT_EFFECT_MODE { # endif # ifndef RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL -# define RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL 1000 +# define RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL 40 # endif # ifndef RGBLIGHT_EFFECT_CHRISTMAS_STEP -- cgit v1.2.3