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Histogram always shows gridlines for 8 stops in log-log mode

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This commit is contained in:
Thanatomanic 2018-07-05 08:24:09 +02:00
parent 30c3765963
commit 7960e07bfe
1 changed files with 8 additions and 4 deletions
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12
rtgui/histogrampanel.cc
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@ -887,6 +887,10 @@ void HistogramArea::updateBackBuffer ()
int nrOfHGridPartitions = (int)rtengine::min (16.0, pow (2.0, floor ((h - 100) / 250) + 2));
int nrOfVGridPartitions = (int)rtengine::min (16.0, pow (2.0, floor ((w - 100) / 250) + 2));
if (rawMode || options.histogramDrawMode == 2) {
nrOfVGridPartitions = 8; // always show 8 stops for the raw histogam and in log-log mode
}
// draw vertical gridlines
if (options.histogramDrawMode < 2) {
for (int i = 1; i < nrOfVGridPartitions; i++) {
@ -895,9 +899,9 @@ void HistogramArea::updateBackBuffer ()
cr->stroke ();
}
} else {
for (int i = 1; i < nrOfVGridPartitions; i++) {
cr->move_to (scalingFunctionLog (w, i * w / nrOfVGridPartitions) + 0.5, 1.5);
cr->line_to (scalingFunctionLog (w, i * w / nrOfVGridPartitions) + 0.5, h - 2);
for (int i = 0; i < nrOfVGridPartitions; i++) {
cr->move_to (scalingFunctionLog (256, pow(2.0,i)) * w / 256 + 0.5, 1.5);
cr->line_to (scalingFunctionLog (256, pow(2.0,i)) * w / 256 + 0.5, h - 2);
cr->stroke ();
}
}
@ -938,7 +942,7 @@ void HistogramArea::on_realize ()
double HistogramArea::scalingFunctionLog(double vsize, double val)
{
double factor = 20.0; // can be tuned if necessary - higher is flatter curve
double factor = 10.0; // can be tuned if necessary - higher is flatter curve
return vsize * log(factor / (factor + val)) / log(factor / (factor + vsize));
}