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traceplot: Clean up trace plotting

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Mike Walters
2016-03-20 20:54:46 +00:00
parent b4bf17d8d5
commit f6d7bf5ca2
1 changed files with 9 additions and 10 deletions
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19
traceplot.cpp
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@@ -55,20 +55,19 @@ void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRa
void TracePlot::plotTrace(QPainter &painter, QRect &rect, float *samples, off_t count, int step = 1)
{
int xprev = 0;
int yprev = 0;
QVector<QPoint> points(count);
range_t<int> xRange{0, rect.width() - 2};
range_t<int> yRange{0, rect.height() - 2};
const float xStep = 1.0 / count * rect.width();
for (off_t i = 0; i < count; i++) {
float sample = samples[i*step];
int x = (float)i / count * rect.width();
int x = i * xStep;
int y = rect.height() - ((sample * rect.height()/2) + rect.height()/2);
if (x < 0) x = 0;
if (y < 0) y = 0;
if (x >= rect.width()-1) x = rect.width()-2;
if (y >= rect.height()-1) y = rect.height()-2;
x = xRange.clip(x);
y = yRange.clip(y);
painter.drawLine(xprev + rect.x(), yprev + rect.y(), x + rect.x(), y + rect.y());
xprev = x;
yprev = y;
points[i] = {x + rect.x(), y + rect.y()};
}
painter.drawLines(points);
}