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要在前后两个图表之间连接对应的坐标轴刻度点，可以通过在父部件中绘制线条来实现。以下是具体步骤和代码实现：

步骤说明

1. 重写paintEvent函数：在Bigraph的paintEvent中绘制连接线。
2. 获取刻度值列表：根据每个坐标轴的最小值、最大值和刻度数量生成刻度值。
3. 转换坐标位置：将刻度值转换为在各自图表中的位置，再转换为父部件中的全局坐标。
4. 绘制连接线：使用QPainter在对应的刻度点之间绘制线条。

代码实现

在Bigraph.h中添加以下内容：

#include <QPainter>protected:void paintEvent(QPaintEvent *event) override;private:void connectAxisTicks(QPainter *painter, QChart *backChart, QLineSeries *backSeries, QChart *fontChart, QLineSeries *fontSeries, bool isXAxis);QList<qreal> getTickValues(QValueAxis *axis);

在Bigraph.cpp中添加以下实现：

void Bigraph::paintEvent(QPaintEvent *event)
{QWidget::paintEvent(event);QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);painter.setPen(QPen(QColor(Qt::gray), 1, Qt::DotLine));// 连接X轴和Y轴的刻度线connectAxisTicks(&painter, backChart, backSeries, fontChart, fontSeries, true);  // X轴connectAxisTicks(&painter, backChart, backSeries, fontChart, fontSeries, false); // Y轴
}void Bigraph::connectAxisTicks(QPainter *painter, QChart *backChart, QLineSeries *backSeries, QChart *fontChart, QLineSeries *fontSeries, bool isXAxis)
{// 获取前后图表的坐标轴QValueAxis *backAxis = isXAxis ? qobject_cast<QValueAxis*>(backChart->axes(Qt::Horizontal).first(): qobject_cast<QValueAxis*>(backChart->axes(Qt::Vertical).first());QValueAxis *fontAxis = isXAxis ? qobject_cast<QValueAxis*>(fontChart->axes(Qt::Horizontal).first(): qobject_cast<QValueAxis*>(fontChart->axes(Qt::Vertical).first());if (!backAxis || !fontAxis) return;// 获取刻度值列表QList<qreal> backTicks = getTickValues(backAxis);QList<qreal> fontTicks = getTickValues(fontAxis);int minCount = qMin(backTicks.size(), fontTicks.size());for (int i = 0; i < minCount; ++i) {// 转换backChart中的刻度点到全局坐标QPointF backPoint;if (isXAxis) {backPoint = backChart->mapToPosition(QPointF(backTicks[i], backAxis->min()), backSeries);} else {backPoint = backChart->mapToPosition(QPointF(backAxis->min(), backTicks[i]), backSeries);}QPoint backViewPos = backChartView->mapFromScene(backPoint);QPoint backGlobalPos = backChartView->pos() + backViewPos;// 转换fontChart中的刻度点到全局坐标QPointF fontPoint;if (isXAxis) {fontPoint = fontChart->mapToPosition(QPointF(fontTicks[i], fontAxis->min()), fontSeries);} else {fontPoint = fontChart->mapToPosition(QPointF(fontAxis->min(), fontTicks[i]), fontSeries);}QPoint fontViewPos = fontChartView->mapFromScene(fontPoint);QPoint fontGlobalPos = fontChartView->pos() + fontViewPos;// 绘制连接线painter->drawLine(backGlobalPos, fontGlobalPos);}
}QList<qreal> Bigraph::getTickValues(QValueAxis *axis)
{QList<qreal> ticks;qreal min = axis->min();qreal max = axis->max();int tickCount = axis->tickCount();if (tickCount < 2) return ticks;qreal step = (max - min) / (tickCount - 1);for (int i = 0; i < tickCount; ++i) {ticks.append(min + i * step);}return ticks;
}

说明

• 坐标转换：使用QChart::mapToPosition将刻度值转换为图表内的坐标，再通过QChartView::mapFromScene转换为视图坐标，最后加上视图在父部件中的位置得到全局坐标。
• 刻度生成：根据轴的min、max和tickCount生成均匀分布的刻度值。
• 线条绘制：使用灰色虚线连接对应的刻度点，形成立体效果。

确保两个图表的坐标轴范围和刻度数一致，以保证连接线正确对齐。通过调整QPen的参数可以更改线条样式。