#include "divergentcolorscale.h"
#include <cmath>
DivergentColorScale::DivergentColorScale(const Color &color1,
const Color &colorMiddle,
const Color &color2)
: ColorScale{{color1, colorMiddle, color2}}
{
}
Color DivergentColorScale::color(float t) const
{
if (t < m_min || t > m_max) {
return Color();
}
// normalize t
t /= std::max(fabs(m_max), fabs(m_min));
if (t > 0.0f) {
return ColorScale::lerp(m_colors[1], m_colors[2], t);
}
if (t < 0.0f) {
return ColorScale::lerp(m_colors[1], m_colors[0], -t);
}
return m_colors[1];
}
DivergentColorScale DivergentColorScale::builtin(BuiltinDivergentColorScale scale)
{
switch (scale) {
case RedGrayBlue:
return DivergentColorScale(Color(68, 68, 221),
Color(189, 189, 189),
Color(221, 68, 68));
/*return ContinuousColorScale{
Color(221, 68, 68),
Color(220, 69, 68),
Color(220, 70, 69),
Color(220, 71, 70),
Color(220, 73, 71),
Color(220, 74, 72),
Color(220, 75, 73),
Color(220, 77, 74),
Color(220, 78, 75),
Color(220, 79, 76),
Color(220, 80, 76),
Color(220, 81, 77),
Color(220, 83, 78),
Color(220, 84, 79),
Color(220, 85, 80),
Color(220, 86, 81),
Color(220, 87, 82),
Color(220, 88, 83),
Color(220, 89, 84),
Color(220, 91, 85),
Color(220, 92, 85),
Color(220, 93, 86),
Color(220, 94, 87),
Color(220, 95, 88),
Color(220, 96, 89),
Color(220, 97, 90),
Color(220, 98, 91),
Color(219, 99, 92),
Color(219, 100, 93),
Color(219, 101, 94),
Color(219, 102, 95),
Color(219, 103, 95),
Color(219, 104, 96),
Color(219, 105, 97),
Color(219, 106, 98),
Color(219, 107, 99),
Color(219, 108, 100),
Color(218, 109, 101),
Color(218, 110, 102),
Color(218, 111, 103),
Color(218, 112, 104),
Color(218, 113, 105),
Color(218, 114, 106),
Color(218, 115, 107),
Color(218, 116, 108),
Color(217, 117, 108),
Color(217, 118, 109),
Color(217, 119, 110),
Color(217, 120, 111),
Color(217, 121, 112),
Color(217, 122, 113),
Color(217, 123, 114),
Color(216, 124, 115),
Color(216, 125, 116),
Color(216, 126, 117),
Color(216, 127, 118),
Color(216, 127, 119),
Color(215, 128, 120),
Color(215, 129, 121),
Color(215, 130, 122),
Color(215, 131, 123),
Color(215, 132, 124),
Color(214, 133, 125),
Color(214, 134, 126),
Color(214, 135, 127),
Color(214, 136, 127),
Color(214, 137, 128),
Color(213, 138, 129),
Color(213, 138, 130),
Color(213, 139, 131),
Color(213, 140, 132),
Color(212, 141, 133),
Color(212, 142, 134),
Color(212, 143, 135),
Color(212, 144, 136),
Color(211, 145, 137),
Color(211, 146, 138),
Color(211, 146, 139),
Color(211, 147, 140),
Color(210, 148, 141),
Color(210, 149, 142),
Color(210, 150, 143),
Color(209, 151, 144),
Color(209, 152, 145),
Color(209, 153, 146),
Color(208, 153, 147),
Color(208, 154, 148),
Color(208, 155, 149),
Color(207, 156, 150),
Color(207, 157, 151),
Color(207, 158, 152),
Color(206, 159, 153),
Color(206, 160, 154),
Color(206, 160, 155),
Color(205, 161, 156),
Color(205, 162, 157),
Color(205, 163, 158),
Color(204, 164, 159),
Color(204, 165, 160),
Color(203, 166, 161),
Color(203, 166, 162),
Color(203, 167, 163),
Color(202, 168, 164),
Color(202, 169, 165),
Color(201, 170, 166),
Color(201, 171, 167),
Color(201, 171, 168),
Color(200, 172, 169),
Color(200, 173, 170),
Color(199, 174, 171),
Color(199, 175, 172),
Color(198, 176, 173),
Color(198, 177, 174),
Color(197, 177, 175),
Color(197, 178, 176),
Color(196, 179, 177),
Color(196, 180, 178),
Color(195, 181, 179),
Color(195, 182, 180),
Color(194, 182, 181),
Color(194, 183, 182),
Color(193, 184, 183),
Color(193, 185, 184),
Color(192, 186, 185),
Color(192, 187, 186),
Color(191, 187, 187),
Color(190, 188, 188),
Color(190, 189, 189),
Color(189, 189, 190),
Color(189, 188, 190),
Color(188, 187, 190),
Color(187, 186, 191),
Color(187, 185, 191),
Color(186, 184, 191),
Color(185, 183, 191),
Color(185, 182, 192),
Color(184, 181, 192),
Color(184, 180, 192),
Color(183, 179, 193),
Color(182, 178, 193),
Color(182, 177, 193),
Color(181, 176, 194),
Color(180, 175, 194),
Color(180, 174, 194),
Color(179, 173, 194),
Color(178, 172, 195),
Color(178, 171, 195),
Color(177, 170, 195),
Color(176, 169, 196),
Color(176, 168, 196),
Color(175, 167, 196),
Color(174, 166, 196),
Color(174, 165, 197),
Color(173, 164, 197),
Color(172, 163, 197),
Color(172, 162, 197),
Color(171, 161, 198),
Color(170, 160, 198),
Color(170, 159, 198),
Color(169, 158, 199),
Color(168, 157, 199),
Color(167, 156, 199),
Color(167, 155, 199),
Color(166, 155, 200),
Color(165, 154, 200),
Color(165, 153, 200),
Color(164, 152, 200),
Color(163, 151, 201),
Color(162, 150, 201),
Color(162, 149, 201),
Color(161, 148, 201),
Color(160, 147, 202),
Color(159, 146, 202),
Color(159, 145, 202),
Color(158, 144, 202),
Color(157, 143, 203),
Color(156, 142, 203),
Color(155, 141, 203),
Color(155, 140, 203),
Color(154, 139, 204),
Color(153, 138, 204),
Color(152, 137, 204),
Color(152, 136, 204),
Color(151, 135, 205),
Color(150, 134, 205),
Color(149, 133, 205),
Color(148, 132, 205),
Color(147, 131, 206),
Color(147, 130, 206),
Color(146, 129, 206),
Color(145, 128, 206),
Color(144, 128, 207),
Color(143, 127, 207),
Color(142, 126, 207),
Color(142, 125, 207),
Color(141, 124, 208),
Color(140, 123, 208),
Color(139, 122, 208),
Color(138, 121, 208),
Color(137, 120, 209),
Color(136, 119, 209),
Color(135, 118, 209),
Color(134, 117, 209),
Color(133, 116, 209),
Color(133, 115, 210),
Color(132, 114, 210),
Color(131, 113, 210),
Color(130, 112, 210),
Color(129, 111, 211),
Color(128, 110, 211),
Color(127, 109, 211),
Color(126, 109, 211),
Color(125, 108, 212),
Color(124, 107, 212),
Color(123, 106, 212),
Color(122, 105, 212),
Color(121, 104, 212),
Color(120, 103, 213),
Color(119, 102, 213),
Color(118, 101, 213),
Color(117, 100, 213),
Color(115, 99, 213),
Color(114, 98, 214),
Color(113, 97, 214),
Color(112, 96, 214),
Color(111, 95, 214),
Color(110, 94, 215),
Color(109, 94, 215),
Color(108, 93, 215),
Color(106, 92, 215),
Color(105, 91, 215),
Color(104, 90, 216),
Color(103, 89, 216),
Color(101, 88, 216),
Color(100, 87, 216),
Color( 99, 86, 216),
Color( 98, 85, 217),
Color( 96, 84, 217),
Color( 95, 83, 217),
Color( 94, 82, 217),
Color( 92, 81, 217),
Color( 91, 80, 218),
Color( 89, 80, 218),
Color( 88, 79, 218),
Color( 86, 78, 218),
Color( 85, 77, 219),
Color( 83, 76, 219),
Color( 82, 75, 219),
Color( 80, 74, 219),
Color( 78, 73, 219),
Color( 77, 72, 220),
Color( 75, 71, 220),
Color( 73, 70, 220),
Color( 71, 69, 220),
Color( 69, 68, 220),
Color( 68, 68, 221)
};*/
default:
return DivergentColorScale::builtin(DivergentColorScale::RedGrayBlue);
}
}
DivergentColorScale *DivergentColorScale::builtin(BuiltinDivergentColorScale scale, void *)
{
switch (scale) {
case RedGrayBlue:
return new DivergentColorScale(Color(68, 68, 221),
Color(189, 189, 189),
Color(221, 68, 68));
default:
return DivergentColorScale::builtin(DivergentColorScale::RedGrayBlue, nullptr);
}
}
