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87 lines
1.6 KiB
87 lines
1.6 KiB
8 years ago
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#include "LEDUtils.h"
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cRGB
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breath_compute () {
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// This code is adapted from FastLED lib8tion.h as of dd5d96c6b289cb6b4b891748a4aeef3ddceaf0e6
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// Eventually, we should consider just using FastLED
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uint8_t i = (uint16_t)millis()/12;
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if( i & 0x80) {
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i = 255 - i;
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}
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i = i << 1;
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uint8_t ii = (i*i)>>8;
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uint8_t iii = (ii*i)>>8;
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i = (( (3 * (uint16_t)(ii)) - ( 2 * (uint16_t)(iii))) / 2) + 2;
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return hsv_to_rgb(200, 255, i);
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}
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// From http://web.mit.edu/storborg/Public/hsvtorgb.c - talk to Scott about licensing
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cRGB
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hsv_to_rgb(uint16_t h, uint16_t s, uint16_t v) {
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cRGB color;
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/* HSV to RGB conversion function with only integer
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* math */
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uint16_t region, fpart, p, q, t;
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if(s == 0) {
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/* color is grayscale */
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color.r = color.g = color.b = v;
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return color;
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}
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/* make hue 0-5 */
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region = (h *6) >> 8;
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/* find remainder part, make it from 0-255 */
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fpart = (h*6) - (region <<8);
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/* calculate temp vars, doing integer multiplication */
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p = (v * (255 - s)) >> 8;
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q = (v * (255 - ((s * fpart) >> 8))) >> 8;
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t = (v * (255 - ((s * (255 - fpart)) >> 8))) >> 8;
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/* assign temp vars based on color cone region */
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switch(region) {
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case 0:
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color.r = v;
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color.g = t;
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color.b = p;
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break;
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case 1:
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color.r = q;
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color.g = v;
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color.b = p;
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break;
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case 2:
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color.r = p;
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color.g = v;
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color.b = t;
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break;
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case 3:
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color.r = p;
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color.g = q;
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color.b = v;
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break;
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case 4:
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color.r = t;
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color.g = p;
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color.b = v;
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break;
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default:
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color.r = v;
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color.g = p;
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color.b = q;
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break;
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}
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return color;
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}
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