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MathUtils: Add exponential interpolation

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Change-Id: I58bb26a6e921cbd1f5532bddcd6a6700ff80b94f
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
This commit is contained in:
Jarek Kobus
2022-11-28 11:28:49 +01:00
parent 23f53dcbda
commit 12b639970f
3 changed files with 50 additions and 5 deletions
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25
src/libs/utils/mathutils.cpp
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@@ -39,9 +39,26 @@ int interpolateTangential(int x, int xHalfLife, int y1, int y2)
return y1;
if (y1 == y2)
return y1;
const double mapped = atan2(double(x), double(xHalfLife));
const double progress = y1 + (y2 - y1) * mapped * 2 / M_PI;
return qRound(progress);
const double angle = atan2((double)x, (double)xHalfLife);
const double result = y1 + (y2 - y1) * angle * 2 / M_PI;
return qRound(result);
}
} // namespace Utils::Math
/*!
Exponential interpolation:
For x = 0 it returns y1.
For x = xHalfLife it returns 50 % of the distance between y1 and y2.
For x = infinity it returns y2.
*/
int interpolateExponential(int x, int xHalfLife, int y1, int y2)
{
if (x == 0)
return y1;
if (y1 == y2)
return y1;
const double exponent = pow(0.5, (double)x / xHalfLife);
const double result = y1 + (y2 - y1) * (1.0 - exponent);
return qRound(result);
}
} // namespace Utils::MathUtils