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115 lines
2.9 KiB
115 lines
2.9 KiB
#ifndef CRGB_H
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#define CRGB_H
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/*
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Control a RGB led with Hue, Saturation and Brightness (HSB / HSV )
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Hue is change by an analog input.
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Brightness is changed by a fading function.
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Saturation stays constant at 255
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getRGB() function based on <http://www.codeproject.com/miscctrl/CPicker.asp>
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dim_curve idea by Jims
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created 05-01-2010 by kasperkamperman.com
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*/
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/*
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dim_curve 'lookup table' to compensate for the nonlinearity of human vision.
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Used in the getRGB function on saturation and brightness to make 'dimming' look more natural.
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Exponential function used to create values below :
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x from 0 - 255 : y = round(pow( 2.0, x+64/40.0) - 1)
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*/
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// uncomment this line if you use HSV is many projects
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// #define USE_HSV
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#ifdef USE_HSV
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const byte dim_curve[] = {
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0, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6,
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6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8,
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8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11,
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11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15,
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15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20,
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20, 20, 21, 21, 22, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, 26,
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27, 27, 28, 28, 29, 29, 30, 30, 31, 32, 32, 33, 33, 34, 35, 35,
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36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 43, 43, 44, 45, 46, 47,
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48, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62,
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63, 64, 65, 66, 68, 69, 70, 71, 73, 74, 75, 76, 78, 79, 81, 82,
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83, 85, 86, 88, 90, 91, 93, 94, 96, 98, 99, 101, 103, 105, 107, 109,
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110, 112, 114, 116, 118, 121, 123, 125, 127, 129, 132, 134, 136, 139, 141, 144,
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146, 149, 151, 154, 157, 159, 162, 165, 168, 171, 174, 177, 180, 183, 186, 190,
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193, 196, 200, 203, 207, 211, 214, 218, 222, 226, 230, 234, 238, 242, 248, 255,
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};
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#endif
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struct cRGB {
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uint8_t g;
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uint8_t r;
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uint8_t b;
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#ifdef USE_HSV
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void SetHSV(int hue, byte sat, byte val) {
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/* convert hue, saturation and brightness ( HSB/HSV ) to RGB
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The dim_curve is used only on brightness/value and on saturation (inverted).
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This looks the most natural.
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*/
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val = dim_curve[val];
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sat = 255 - dim_curve[255 - sat];
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int base;
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if (sat == 0) { // Acromatic color (gray). Hue doesn't mind.
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r = val;
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g = val;
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b = val;
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}
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else {
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base = ((255 - sat) * val) >> 8;
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switch (hue / 60) {
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case 0:
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r = val;
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g = (((val - base)*hue) / 60) + base;
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b = base;
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break;
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case 1:
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r = (((val - base)*(60 - (hue % 60))) / 60) + base;
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g = val;
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b = base;
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break;
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case 2:
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r = base;
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g = val;
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b = (((val - base)*(hue % 60)) / 60) + base;
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break;
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case 3:
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r = base;
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g = (((val - base)*(60 - (hue % 60))) / 60) + base;
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b = val;
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break;
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case 4:
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r = (((val - base)*(hue % 60)) / 60) + base;
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g = base;
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b = val;
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break;
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case 5:
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r = val;
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g = base;
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b = (((val - base)*(60 - (hue % 60))) / 60) + base;
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break;
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}
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}
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}
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#endif
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};
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#endif |