83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
#include "panels/chart/LivePanner.hpp"
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#include <QEvent>
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#include <QMouseEvent>
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#include <QWheelEvent>
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#include <qwt_plot.h>
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#include <qwt_scale_div.h>
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namespace geopro::app {
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LivePanner::LivePanner(QwtPlot* plot, int xAxis, int yAxis, QObject* parent)
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: QObject(parent), plot_(plot), xAxis_(xAxis), yAxis_(yAxis) {
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if (plot_ && plot_->canvas()) plot_->canvas()->installEventFilter(this);
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}
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bool LivePanner::eventFilter(QObject* obj, QEvent* ev) {
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if (!plot_ || obj != plot_->canvas()) return QObject::eventFilter(obj, ev);
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switch (ev->type()) {
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case QEvent::MouseButtonPress: {
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auto* me = static_cast<QMouseEvent*>(ev);
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if (me->button() == Qt::LeftButton) {
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panning_ = true;
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startPos_ = me->pos();
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x0Min_ = plot_->axisScaleDiv(xAxis_).lowerBound();
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x0Max_ = plot_->axisScaleDiv(xAxis_).upperBound();
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y0Min_ = plot_->axisScaleDiv(yAxis_).lowerBound();
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y0Max_ = plot_->axisScaleDiv(yAxis_).upperBound();
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return true;
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}
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break;
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}
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case QEvent::MouseMove: {
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if (!panning_) break;
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auto* me = static_cast<QMouseEvent*>(ev);
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const int W = plot_->canvas()->width();
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const int H = plot_->canvas()->height();
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if (W <= 0 || H <= 0) break;
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const double dxData = (me->pos().x() - startPos_.x()) * (x0Max_ - x0Min_) / W;
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const double dyData = (me->pos().y() - startPos_.y()) * (y0Max_ - y0Min_) / H;
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// 拖右(dx>0)→窗口左移(xmin/xmax 减)，内容随光标右移；
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// 拖下(像素 dy>0)→yLeft 数据向上→窗口上移(ymin/ymax 增)，内容随光标下移。
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plot_->setAxisScale(xAxis_, x0Min_ - dxData, x0Max_ - dxData);
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plot_->setAxisScale(yAxis_, y0Min_ + dyData, y0Max_ + dyData);
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plot_->replot();
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return true;
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}
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case QEvent::MouseButtonRelease: {
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auto* me = static_cast<QMouseEvent*>(ev);
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if (me->button() == Qt::LeftButton) {
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panning_ = false;
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return true;
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}
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break;
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}
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case QEvent::Wheel: {
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// 滚轮缩放（以光标为中心，上滚=放大），并 **消费事件**（return true）避免冒泡到外层
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// 滚动区域触发滚动条。两轴同因子缩放→保持锁定的真实比尺。
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auto* we = static_cast<QWheelEvent*>(ev);
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const int d = we->angleDelta().y();
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if (d == 0) return true;
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const double f = (d > 0) ? (1.0 / 1.15) : 1.15; // 上滚→区间缩小→放大
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const QPointF pos = we->position();
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const double cx = plot_->invTransform(xAxis_, pos.x());
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const double cy = plot_->invTransform(yAxis_, pos.y());
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const double xMin = plot_->axisScaleDiv(xAxis_).lowerBound();
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const double xMax = plot_->axisScaleDiv(xAxis_).upperBound();
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const double yMin = plot_->axisScaleDiv(yAxis_).lowerBound();
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const double yMax = plot_->axisScaleDiv(yAxis_).upperBound();
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plot_->setAxisScale(xAxis_, cx - (cx - xMin) * f, cx + (xMax - cx) * f);
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plot_->setAxisScale(yAxis_, cy - (cy - yMin) * f, cy + (yMax - cy) * f);
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plot_->replot();
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we->accept();
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return true;
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}
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default:
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break;
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}
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return QObject::eventFilter(obj, ev);
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}
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} // namespace geopro::app
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