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[Gui] fix default color gradient numbering

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as reported here: https://forum.freecadweb.org/viewtopic.php?p=598390#p598390
we must assure the user sees not by default get several gradient labels
showing the same and labels showing 0.000
This commit is contained in:
Uwe
2022-05-30 02:57:29 +02:00
parent 3f34fff3c3
commit 37cd94e4e4
1 changed files with 9 additions and 5 deletions
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14
src/Gui/SoFCColorGradient.cpp
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@@ -156,16 +156,20 @@ void SoFCColorGradient::setRange(float fMin, float fMax, int prec)
{
_cColGrad.setRange(fMin, fMax);
// format the label the following way:
// if fMin is smaller than 1e-<precision> or fMax greater than 1e+4, output in scientific notation
// otherwise output "normal" (fixed notation)
SoMFString label;
float eps = std::pow(10.0f, static_cast<float>(-prec));
float value_min = std::min<float>(fabs(fMin), fabs(fMax));
float value_max = std::max<float>(fabs(fMin), fabs(fMax));
bool scientific = (value_min < eps && value_min > 0.0f) || value_max > 1e4;
// format the label the following way:
// if Min is smaller than 1e-<precision>,
// or Max greater than 1e+4,
// or (Max - Min) < 1e-<precision> * number of labels - 1 (assures every label shows different number)
// -> output in scientific notation
// otherwise output "normal" (fixed notation)
bool scientific = (value_min < eps && value_min > 0.0f)
|| (value_max - value_min) < eps * (_cColGrad.getCountColors() - 1)
|| value_max > 1e4;
std::ios::fmtflags flags = scientific ? (std::ios::scientific | std::ios::showpoint | std::ios::showpos)
: (std::ios::fixed | std::ios::showpoint | std::ios::showpos);