466 lines
12 KiB
C++
466 lines
12 KiB
C++
#include "plotwidget.h"
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#include <QPainter>
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#include <QPainterPath>
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#include <QtMath>
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#include <QFontMetrics>
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#include <algorithm>
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PlotWidget::PlotWidget(QWidget *parent)
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: QWidget(parent)
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, m_totalPoints(0)
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, m_displayPoints(3000)
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, m_yMin(0)
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, m_yMax(65535)
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, m_autoYRange(true)
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, m_autoScroll(true)
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, m_dragging(false)
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, m_marginLeft(70)
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, m_marginRight(160)
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, m_marginTop(30)
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, m_marginBottom(50)
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, m_bgColor("#1a1a2e")
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, m_gridColor("#333355")
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, m_gridColorMinor("#252545")
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, m_textColor("#cccccc")
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, m_axisColor("#888888")
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, m_dirty(true)
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{
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m_data.resize(16);
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m_channelVisible.fill(false, 16);
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m_colors = defaultColors();
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setMouseTracking(true);
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setMinimumSize(400, 300);
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// 定时刷新（约30fps）
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m_refreshTimer = new QTimer(this);
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connect(m_refreshTimer, &QTimer::timeout, this, [this]() {
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if (m_dirty) {
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m_dirty = false;
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update();
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}
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});
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m_refreshTimer->start(33);
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}
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QList<QColor> PlotWidget::defaultColors()
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{
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return {
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QColor("#FF4444"), QColor("#44FF44"), QColor("#4488FF"), QColor("#FFAA00"),
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QColor("#FF44FF"), QColor("#44FFFF"), QColor("#FFFF44"), QColor("#FF8888"),
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QColor("#88FF88"), QColor("#8888FF"), QColor("#CC6600"), QColor("#FF66CC"),
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QColor("#66FFCC"), QColor("#CCFF66"), QColor("#AA66FF"), QColor("#FF6666"),
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};
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}
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void PlotWidget::addDataPoint(const QVector<double> &values)
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{
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if (values.size() < 16) return;
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for (int i = 0; i < 16; ++i) {
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m_data[i].append(values[i]);
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}
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m_totalPoints++;
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m_dirty = true;
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if (m_autoYRange && m_totalPoints % 50 == 0) {
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autoRangeY();
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}
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}
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void PlotWidget::setAllData(const QVector<QVector<double>> &channels)
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{
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clear();
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if (channels.size() >= 16) {
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for (int i = 0; i < 16; ++i) {
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m_data[i] = channels[i];
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}
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m_totalPoints = channels.isEmpty() ? 0 : channels[0].size();
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}
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m_autoScroll = true;
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m_autoYRange = true;
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autoRangeY();
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m_dirty = true;
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update();
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}
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void PlotWidget::clear()
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{
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for (auto &ch : m_data) {
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ch.clear();
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}
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m_totalPoints = 0;
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m_autoScroll = true;
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m_autoYRange = true;
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m_dirty = true;
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update();
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}
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void PlotWidget::setChannelVisible(int channel, bool visible)
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{
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if (channel >= 0 && channel < 16) {
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m_channelVisible[channel] = visible;
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m_dirty = true;
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update(); // 立即刷新，不等定时器
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}
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}
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bool PlotWidget::isChannelVisible(int channel) const
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{
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return channel >= 0 && channel < 16 ? m_channelVisible[channel] : false;
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}
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void PlotWidget::setDisplayPointCount(int count)
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{
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m_displayPoints = qMax(10, count);
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m_dirty = true;
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}
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int PlotWidget::displayPointCount() const
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{
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return m_displayPoints;
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}
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void PlotWidget::setYRange(double min, double max)
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{
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m_yMin = min;
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m_yMax = max;
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m_autoYRange = false;
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m_dirty = true;
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}
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void PlotWidget::autoRangeY()
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{
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if (m_totalPoints == 0) {
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m_yMin = 0;
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m_yMax = 65535;
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return;
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}
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double globalMin = 1e18, globalMax = -1e18;
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int startIdx = qMax(0, m_totalPoints - m_displayPoints);
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for (int ch = 0; ch < 16; ++ch) {
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if (!m_channelVisible[ch]) continue;
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const auto &channel = m_data[ch];
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for (int i = startIdx; i < channel.size(); ++i) {
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double v = channel[i];
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if (v < globalMin) globalMin = v;
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if (v > globalMax) globalMax = v;
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}
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}
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if (globalMax < globalMin) {
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// 没有可见通道或没有数据
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return;
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}
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if (globalMax - globalMin < 1.0) {
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globalMin -= 50;
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globalMax += 50;
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}
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double margin = (globalMax - globalMin) * 0.1;
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m_yMin = globalMin - margin;
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m_yMax = globalMax + margin;
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}
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void PlotWidget::setTitle(const QString &title)
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{
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m_title = title;
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m_dirty = true;
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}
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int PlotWidget::totalPoints() const
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{
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return m_totalPoints;
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}
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QRectF PlotWidget::plotArea() const
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{
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return QRectF(m_marginLeft, m_marginTop,
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width() - m_marginLeft - m_marginRight,
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height() - m_marginTop - m_marginBottom);
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}
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QPointF PlotWidget::dataToWidget(double x, double y) const
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{
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QRectF area = plotArea();
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double px = area.left() + x * area.width();
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double py = area.bottom() - ((y - m_yMin) / (m_yMax - m_yMin)) * area.height();
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return QPointF(px, py);
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}
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// ================ Paint ================
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void PlotWidget::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing, true);
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drawBackground(painter);
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drawGrid(painter);
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drawCurves(painter);
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drawAxes(painter);
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drawLegend(painter);
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// 标题
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if (!m_title.isEmpty()) {
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painter.setPen(m_textColor);
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QFont titleFont = font();
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titleFont.setPointSize(12);
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titleFont.setBold(true);
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painter.setFont(titleFont);
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painter.drawText(QRect(0, 2, width(), m_marginTop - 4), Qt::AlignCenter, m_title);
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}
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// 数据点计数
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painter.setPen(QColor("#666666"));
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QFont smallFont = font();
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smallFont.setPointSize(8);
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painter.setFont(smallFont);
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QString info = QString("总点数: %1 显示: %2 范围: [%3, %4]")
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.arg(m_totalPoints)
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.arg(m_displayPoints)
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.arg(m_yMin, 0, 'f', 0)
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.arg(m_yMax, 0, 'f', 0);
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painter.drawText(QRect(m_marginLeft, height() - m_marginBottom + 30,
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width() - m_marginLeft - m_marginRight, 20),
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Qt::AlignLeft | Qt::AlignVCenter, info);
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}
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void PlotWidget::drawBackground(QPainter &painter)
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{
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painter.fillRect(rect(), m_bgColor);
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QRectF area = plotArea();
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painter.fillRect(area, QColor("#16213e"));
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}
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void PlotWidget::drawGrid(QPainter &painter)
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{
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QRectF area = plotArea();
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if (area.width() <= 0 || area.height() <= 0) return;
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// 计算合适的刻度
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double range = m_yMax - m_yMin;
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if (range <= 0) return;
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double roughStep = range / 8.0;
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double exponent = qFloor(log10(roughStep));
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double mantissa = roughStep / qPow(10, exponent);
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double gridStep;
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if (mantissa < 1.5) gridStep = qPow(10, exponent);
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else if (mantissa < 3.5) gridStep = 2 * qPow(10, exponent);
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else if (mantissa < 7.5) gridStep = 5 * qPow(10, exponent);
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else gridStep = 10 * qPow(10, exponent);
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if (gridStep <= 0) gridStep = 1;
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double firstGrid = qCeil(m_yMin / gridStep) * gridStep;
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QPen majorPen(m_gridColor, 1, Qt::SolidLine);
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QPen minorPen(m_gridColorMinor, 1, Qt::DotLine);
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// Y轴网格
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for (double y = firstGrid; y <= m_yMax; y += gridStep) {
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painter.setPen(majorPen);
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QPointF p = dataToWidget(0, y);
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painter.drawLine(QPointF(area.left(), p.y()), QPointF(area.right(), p.y()));
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// 标签
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painter.setPen(m_textColor);
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QFont gridFont = font();
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gridFont.setPointSize(8);
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painter.setFont(gridFont);
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painter.drawText(QRectF(0, p.y() - 10, m_marginLeft - 5, 20),
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Qt::AlignRight | Qt::AlignVCenter,
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QString::number(y, 'f', 0));
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}
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// X轴网格（时间/采样点）
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int startIdx = qMax(0, m_totalPoints - m_displayPoints);
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if (m_autoScroll) {
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startIdx = qMax(0, m_totalPoints - m_displayPoints);
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}
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// 画几条竖线
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int xStep = m_displayPoints / 5;
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if (xStep < 1) xStep = 1;
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// 竖网格线（基于显示的采样点）
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for (int i = 0; i <= m_displayPoints; i += xStep) {
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double t = (double)i / m_displayPoints;
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QPointF p = dataToWidget(t, 0);
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painter.setPen(minorPen);
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painter.drawLine(QPointF(p.x(), area.top()), QPointF(p.x(), area.bottom()));
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painter.setPen(m_textColor);
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QFont gridFont = font();
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gridFont.setPointSize(8);
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painter.setFont(gridFont);
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int sampleIdx = startIdx + i;
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painter.drawText(QRectF(p.x() - 30, area.bottom() + 3, 60, 15),
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Qt::AlignCenter, QString::number(sampleIdx));
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}
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}
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void PlotWidget::drawCurves(QPainter &painter)
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{
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QRectF area = plotArea();
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if (area.width() <= 0 || area.height() <= 0) return;
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if (m_totalPoints == 0) return;
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int startIdx = qMax(0, m_totalPoints - m_displayPoints);
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int visibleCount = m_totalPoints - startIdx;
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if (visibleCount < 2) return;
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for (int ch = 0; ch < 16; ++ch) {
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if (!m_channelVisible[ch]) continue;
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const auto &channel = m_data[ch];
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if (channel.size() <= startIdx) continue;
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QPen pen(m_colors[ch], 1.2);
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painter.setPen(pen);
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QPainterPath path;
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bool first = true;
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int endIdx = channel.size();
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for (int i = startIdx; i < endIdx; ++i) {
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double y = channel[i];
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double t = (double)(i - startIdx) / (visibleCount - 1);
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QPointF pt = dataToWidget(t, y);
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if (first) {
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path.moveTo(pt);
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first = false;
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} else {
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path.lineTo(pt);
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}
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}
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painter.drawPath(path);
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}
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}
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void PlotWidget::drawAxes(QPainter &painter)
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{
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QRectF area = plotArea();
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// Y轴
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painter.setPen(QPen(m_axisColor, 1.5));
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painter.drawLine(area.topLeft(), area.bottomLeft());
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// X轴
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painter.drawLine(area.bottomLeft(), area.bottomRight());
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// Y轴标签
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painter.setPen(m_textColor);
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QFont labelFont = font();
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labelFont.setPointSize(9);
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painter.setFont(labelFont);
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painter.save();
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painter.translate(12, area.center().y());
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painter.rotate(-90);
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painter.drawText(QRectF(-50, -10, 100, 20), Qt::AlignCenter, "ADC Value");
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painter.restore();
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}
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void PlotWidget::drawLegend(QPainter &painter)
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{
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QRectF area = plotArea();
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int legendX = area.right() + 10;
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int legendY = area.top() + 5;
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int itemHeight = 18;
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painter.setPen(m_textColor);
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QFont legendFont = font();
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legendFont.setPointSize(8);
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painter.setFont(legendFont);
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for (int ch = 0; ch < 16; ++ch) {
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int y = legendY + ch * itemHeight;
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// 颜色方块：勾选=彩色，不勾选=灰白
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QColor color = m_channelVisible[ch] ? m_colors[ch] : QColor("#555555");
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painter.fillRect(QRect(legendX, y + 2, 12, 12), color);
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if (!m_channelVisible[ch]) {
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painter.setPen(QPen(QColor("#888888"), 1));
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painter.drawRect(QRect(legendX, y + 2, 12, 12));
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}
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// 通道名
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QString label = QString("CH%1").arg(ch+1);
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painter.setPen(m_channelVisible[ch] ? m_textColor : QColor("#555555"));
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painter.drawText(QRect(legendX + 16, y, 50, itemHeight),
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Qt::AlignLeft | Qt::AlignVCenter, label);
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}
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}
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// ================ Mouse Events ================
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void PlotWidget::wheelEvent(QWheelEvent *event)
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{
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QRectF area = plotArea();
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if (!area.contains(event->posF())) return;
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double zoomFactor = 1.15;
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if (event->angleDelta().y() < 0) {
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zoomFactor = 1.0 / zoomFactor;
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}
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double centerY = m_yMin + (m_yMax - m_yMin) / 2.0;
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double halfRange = (m_yMax - m_yMin) / 2.0 * zoomFactor;
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m_yMin = centerY - halfRange;
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m_yMax = centerY + halfRange;
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m_autoYRange = false;
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m_dirty = true;
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}
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void PlotWidget::mousePressEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::RightButton) {
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m_dragging = true;
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m_dragStart = event->pos(); // mousePressEvent still uses pos()
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m_dragYMinStart = m_yMin;
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m_dragYMaxStart = m_yMax;
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setCursor(Qt::ClosedHandCursor);
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}
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}
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void PlotWidget::mouseMoveEvent(QMouseEvent *event)
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{
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if (m_dragging) {
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QRectF area = plotArea();
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double dy = (event->pos().y() - m_dragStart.y()) / area.height() * (m_yMax - m_yMin);
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m_yMin = m_dragYMinStart - dy;
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m_yMax = m_dragYMaxStart - dy;
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m_autoYRange = false;
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m_dirty = true;
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}
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}
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void PlotWidget::mouseReleaseEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::RightButton) {
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m_dragging = false;
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setCursor(Qt::ArrowCursor);
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}
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}
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void PlotWidget::mouseDoubleClickEvent(QMouseEvent *)
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{
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// 双击恢复自动范围
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m_autoYRange = true;
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m_autoScroll = true;
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autoRangeY();
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m_dirty = true;
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}
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void PlotWidget::resizeEvent(QResizeEvent *)
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{
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m_dirty = true;
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}
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