55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
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#include "tools/cabana/chart/sparkline.h"
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#include <algorithm>
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#include <limits>
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#include <QPainter>
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void Sparkline::update(const MessageId &msg_id, const cabana::Signal *sig, double last_msg_ts, int range, QSize size) {
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points.clear();
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double value = 0;
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auto [first, last] = can->eventsInRange(msg_id, std::make_pair(last_msg_ts -range, last_msg_ts));
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for (auto it = first; it != last; ++it) {
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if (sig->getValue((*it)->dat, (*it)->size, &value)) {
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points.emplace_back(((*it)->mono_time - (*first)->mono_time) / 1e9, value);
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}
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}
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if (points.empty() || size.isEmpty()) {
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pixmap = QPixmap();
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return;
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}
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const auto [min, max] = std::minmax_element(points.begin(), points.end(),
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[](auto &l, auto &r) { return l.y() < r.y(); });
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min_val = min->y() == max->y() ? min->y() - 1 : min->y();
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max_val = min->y() == max->y() ? max->y() + 1 : max->y();
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freq_ = points.size() / std::max(points.back().x() - points.front().x(), 1.0);
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render(sig->color, range, size);
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}
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void Sparkline::render(const QColor &color, int range, QSize size) {
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const double xscale = (size.width() - 1) / (double)range;
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const double yscale = (size.height() - 3) / (max_val - min_val);
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for (auto &v : points) {
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v = QPoint(v.x() * xscale, 1 + std::abs(v.y() - max_val) * yscale);
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}
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qreal dpr = qApp->devicePixelRatio();
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size *= dpr;
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if (size != pixmap.size()) {
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pixmap = QPixmap(size);
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}
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pixmap.setDevicePixelRatio(dpr);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setRenderHint(QPainter::Antialiasing, points.size() < 500);
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painter.setPen(color);
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painter.drawPolyline(points.data(), points.size());
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painter.setPen(QPen(color, 3));
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if ((points.back().x() - points.front().x()) / points.size() > 8) {
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painter.drawPoints(points.data(), points.size());
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} else {
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painter.drawPoint(points.back());
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}
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}
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