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Minor update to drawing of histogram

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After some pixel peeping I made sure the histogram lines stay within the drawing area completely
This commit is contained in:
Thanatomanic
2018-07-06 07:18:42 +02:00
parent cf610f5f5b
commit 5419b9dd20
1 changed files with 7 additions and 9 deletions
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16
rtgui/histogrampanel.cc
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@@ -28,6 +28,7 @@
#include "../rtengine/color.h"
#include "../rtengine/opthelper.h"
#include "../rtengine/iccstore.h"
using namespace rtengine;
extern Options options;
@@ -953,23 +954,20 @@ void HistogramArea::drawCurve(Cairo::RefPtr<Cairo::Context> &cr,
scale = scale <= 0.f ? 0.001f : scale; // avoid division by zero and negative values
for (int i = 0; i < 256; i++) {
double val = data[i] * (double)(vsize - 2) / scale;
double val = data[i] * (double)vsize / scale;
if (drawMode > 0) { // scale y for single and double log-scale
val = scalingFunctionLog ((double)vsize, val);
}
if (val > vsize - 1) {
val = vsize - 1;
}
double iscaled = i;
if (drawMode == 2) { // scale x for double log-scale
iscaled = scalingFunctionLog (256.0, (double)i);
iscaled = scalingFunctionLog (255.0, (double)i);
}
double posX = (iscaled / 255.0) * (hsize - 1);
double posY = vsize - 1 - val;
double posY = vsize - 2 + val * (4 - vsize) / vsize;
cr->line_to (posX, posY);
}