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plot: Split traceplot drawing into fixed-width tiles

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Mike Walters
2016-03-26 02:04:22 +00:00
parent d332fc2628
commit 2d948d2e67
2 changed files with 27 additions and 2 deletions
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27
traceplot.cpp
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@@ -26,8 +26,31 @@ TracePlot::TracePlot(std::shared_ptr<AbstractSampleSource> source) : sampleSourc
void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRange)
{
auto image = drawTile(QRect(0, 0, rect.width(), rect.height()), sampleRange);
painter.drawImage(rect, image);
int samplesPerColumn = sampleRange.length() / rect.width();
int samplesPerTile = tileWidth * samplesPerColumn;
off_t tileID = sampleRange.minimum / samplesPerTile;
off_t tileOffset = sampleRange.minimum % samplesPerTile; // Number of samples to skip from first image tile
int xOffset = tileOffset / samplesPerColumn; // Number of columns to skip from first image tile
// Paint first (possibly partial) tile
painter.drawImage(
QRect(rect.x(), rect.y(), tileWidth - xOffset, height()),
getTile(tileID++, samplesPerTile),
QRect(xOffset, 0, tileWidth - xOffset, height())
);
// Paint remaining tiles
for (int x = tileWidth - xOffset; x < rect.right(); x += tileWidth) {
painter.drawImage(
QRect(x, rect.y(), tileWidth, height()),
getTile(tileID++, samplesPerTile)
);
}
}
QImage TracePlot::getTile(off_t tileID, off_t sampleCount)
{
return drawTile(QRect(0, 0, tileWidth, height()), {tileID * sampleCount, (tileID + 1) * sampleCount});
}
QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)