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Regression Curves: Use a contrast color for the regression curves

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Use a list of predefined colors, and select the color with the larges RGB difference to the source curve. This will ensure that we avoid ending up with fully white or fully black curves, unable to see.
This commit is contained in:
Magne Sjaastad
2023-10-17 11:35:36 +02:00
parent 2fe290bbce
commit f763f73ba3
3 changed files with 40 additions and 6 deletions
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24
ApplicationLibCode/Application/Tools/RiaColorTools.cpp
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@@ -136,6 +136,30 @@ cvf::Color3f RiaColorTools::fromQColorTo3f( QColor color )
return cvf::Color3f( color.redF(), color.greenF(), color.blueF() );
}
//--------------------------------------------------------------------------------------------------
/// Find the color with larges distance to the given color based on RGB distance
//--------------------------------------------------------------------------------------------------
cvf::Color3f RiaColorTools::selectContrastColorFromCandiates( cvf::Color3f color, const cvf::Color3fArray& candidates )
{
if ( candidates.size() == 0 ) return color;
float maxDiff = 0.0f;
cvf::Color3f selectedColor = color;
for ( const auto& candidate : candidates )
{
const auto diff = std::fabs( color.r() - candidate.r() ) + std::fabs( color.g() - candidate.g() ) +
std::fabs( color.b() - candidate.b() );
if ( diff > maxDiff )
{
maxDiff = diff;
selectedColor = candidate;
}
}
return selectedColor;
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------