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color.cc constexpr std::sqrt is not ISO C++ (#432)

master
Andrew Hundt 2017-07-28 03:11:57 -07:00 committed by Wolfgang Hess
parent 46c7ce886d
commit d22402bdfa
1 changed files with 1 additions and 1 deletions
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cartographer/io/color.cc
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@ -29,7 +29,6 @@ namespace {
constexpr float kInitialHue = 0.69f;
constexpr float kSaturation = 0.85f;
constexpr float kValue = 0.77f;
constexpr float kGoldenRatioConjugate = (std::sqrt(5.f) - 1.f) / 2.f;
FloatColor HsvToRgb(const float h, const float s, const float v) {
const float h_6 = (h == 1.f) ? 0.f : 6 * h;
@ -63,6 +62,7 @@ FloatColor GetColor(int id) {
CHECK_GE(id, 0);
// Uniform color sampling using the golden ratio from
// http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
constexpr float kGoldenRatioConjugate = 0.6180339887498949f;
const float hue = std::fmod(kInitialHue + kGoldenRatioConjugate * id, 1.f);
return HsvToRgb(hue, kSaturation, kValue);
}