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https://github.com/tumic0/GPXSee.git
synced 2025-07-08 00:04:27 +02:00
Added support for POI files in GPX format
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316
src/graphview.cpp
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316
src/graphview.cpp
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#include <float.h>
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#include <QGraphicsView>
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#include <QGraphicsSceneMouseEvent>
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#include <QEvent>
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#include <QGraphicsSimpleTextItem>
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#include "config.h"
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#include "slideritem.h"
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#include "sliderinfoitem.h"
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#include "infoitem.h"
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#include "graphview.h"
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#define MARGIN 10.0
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void Scene::mousePressEvent(QGraphicsSceneMouseEvent *e)
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{
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if (e->button() == Qt::LeftButton)
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emit mouseClicked(e->scenePos());
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QGraphicsScene::mousePressEvent(e);
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}
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GraphView::GraphView(QWidget *parent)
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: QGraphicsView(parent)
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{
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_scene = new Scene(this);
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setScene(_scene);
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_xAxis = new AxisItem(AxisItem::X);
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_yAxis = new AxisItem(AxisItem::Y);
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_slider = new SliderItem();
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_slider->setZValue(2.0);
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connect(_slider, SIGNAL(positionChanged(const QPointF&)), this,
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SLOT(emitSliderPositionChanged(const QPointF&)));
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connect(_scene, SIGNAL(mouseClicked(const QPointF&)), this,
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SLOT(newSliderPosition(const QPointF&)));
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_info = new InfoItem();
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_sliderInfo = new SliderInfoItem(_slider);
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_sliderInfo->setZValue(2.0);
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_xMax = -FLT_MAX;
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_xMin = FLT_MAX;
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_yMax = -FLT_MAX;
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_yMin = FLT_MAX;
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_xScale = 1;
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_yScale = 1;
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_precision = 0;
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}
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GraphView::~GraphView()
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{
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if (_xAxis->scene() != _scene)
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delete _xAxis;
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if (_yAxis->scene() != _scene)
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delete _yAxis;
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if (_slider->scene() != _scene)
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delete _slider;
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if (_info->scene() != _scene)
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delete _info;
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delete _scene;
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}
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void GraphView::updateBounds(const QPointF &point)
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{
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if (point.x() < _xMin)
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_xMin = point.x();
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if (point.x() > _xMax)
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_xMax = point.x();
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if (point.y() < _yMin)
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_yMin = point.y();
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if (point.y() > _yMax)
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_yMax = point.y();
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}
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void GraphView::createXLabel()
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{
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_xAxis->setLabel(QString("%1 [%2]").arg(_xLabel).arg(_xUnits));
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}
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void GraphView::createYLabel()
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{
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_yAxis->setLabel(QString("%1 [%2]").arg(_yLabel).arg(_yUnits));
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}
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void GraphView::setXLabel(const QString &label)
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{
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_xLabel = label;
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createXLabel();
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}
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void GraphView::setYLabel(const QString &label)
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{
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_yLabel = label;
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createYLabel();
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}
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void GraphView::setXUnits(const QString &units)
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{
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_xUnits = units;
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createXLabel();
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}
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void GraphView::setYUnits(const QString &units)
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{
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_yUnits = units;
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createYLabel();
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}
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void GraphView::setXScale(qreal scale)
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{
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_xScale = scale;
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}
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void GraphView::setYScale(qreal scale)
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{
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_yScale = scale;
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}
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void GraphView::loadData(const QVector<QPointF> &data)
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{
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QPainterPath path;
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QGraphicsPathItem *pi;
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QColor color = _colorShop.color();
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if (data.size() < 2)
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return;
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updateBounds(data.at(0));
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path.moveTo(data.at(0).x(), -data.at(0).y());
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for (int i = 1; i < data.size(); i++) {
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path.lineTo(data.at(i).x(), -data.at(i).y());
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updateBounds(data.at(i));
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}
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pi = new QGraphicsPathItem(path);
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QBrush brush(color, Qt::SolidPattern);
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QPen pen(brush, 0);
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pi->setPen(pen);
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_scene->addItem(pi);
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_graphs.append(pi);
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if (_graphs.size() > 1)
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_sliderInfo->hide();
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redraw();
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}
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void GraphView::redraw()
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{
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if (!_graphs.isEmpty())
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resize(viewport()->size() - QSizeF(MARGIN, MARGIN));
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}
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void GraphView::resize(const QSizeF &size)
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{
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QRectF r;
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QSizeF mx, my;
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QTransform transform;
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qreal xs, ys;
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if (_xAxis->scene() == _scene)
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_scene->removeItem(_xAxis);
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if (_yAxis->scene() == _scene)
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_scene->removeItem(_yAxis);
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if (_slider->scene() == _scene)
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_scene->removeItem(_slider);
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if (_info->scene() == _scene)
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_scene->removeItem(_info);
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for (int i = 0; i < _graphs.size(); i++)
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_graphs.at(i)->resetTransform();
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_xAxis->setRange(QPointF(_xMin * _xScale, _xMax * _xScale));
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_yAxis->setRange(QPointF(_yMin * _yScale, _yMax * _yScale));
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mx = _xAxis->margin();
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my = _yAxis->margin();
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r = _scene->itemsBoundingRect();
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xs = (size.width() - (my.width() + mx.width())) / r.width();
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ys = (size.height() - (mx.height() + my.height())
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- _info->boundingRect().height()) / r.height();
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transform.scale(xs, ys);
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for (int i = 0; i < _graphs.size(); i++)
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_graphs.at(i)->setTransform(transform);
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r = _scene->itemsBoundingRect();
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_xAxis->setSize(r.width());
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_yAxis->setSize(r.height());
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_xAxis->setPos(r.bottomLeft());
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_yAxis->setPos(r.bottomLeft());
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_scene->addItem(_xAxis);
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_scene->addItem(_yAxis);
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qreal sp = (_slider->pos().x() == _slider->area().left())
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? 0 : (_slider->pos().x() - _slider->area().left())
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/ _slider->area().width();
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_slider->setArea(r);
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_slider->setPos(QPointF(sp * r.width(), r.bottom()));
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_scene->addItem(_slider);
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const QPainterPath &path = _graphs.at(0)->path();
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QPointF p = path.pointAtPercent(sp);
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_sliderInfo->setText(QString::number(-p.y() * _yScale, 'f', _precision));
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r = _scene->itemsBoundingRect();
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_info->setPos(r.topLeft() + QPointF(r.width()/2
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- _info->boundingRect().width()/2, -_info->boundingRect().height()));
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_scene->addItem(_info);
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_scene->setSceneRect(_scene->itemsBoundingRect());
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}
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void GraphView::resizeEvent(QResizeEvent *)
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{
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if (!_graphs.empty())
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redraw();
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}
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void GraphView::plot(QPainter *painter, const QRectF &target)
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{
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qreal ratio = target.width() / target.height();
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QSizeF orig = _scene->sceneRect().size();
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QSizeF canvas = QSizeF(orig.height() * ratio, orig.height());
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resize(canvas);
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_slider->hide();
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_info->hide();
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_scene->render(painter, target, QRectF());
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_slider->show();
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_info->show();
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resize(orig);
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}
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void GraphView::clear()
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{
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if (_xAxis->scene() == _scene)
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_scene->removeItem(_xAxis);
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if (_yAxis->scene() == _scene)
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_scene->removeItem(_yAxis);
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if (_slider->scene() == _scene)
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_scene->removeItem(_slider);
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if (_info->scene() == _scene)
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_scene->removeItem(_info);
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_sliderInfo->show();
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_slider->clear();
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_info->clear();
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_scene->clear();
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_graphs.clear();
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_colorShop.reset();
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_xMax = -FLT_MAX;
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_xMin = FLT_MAX;
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_yMax = -FLT_MAX;
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_yMin = FLT_MAX;
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_scene->setSceneRect(0, 0, 0, 0);
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}
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void GraphView::emitSliderPositionChanged(const QPointF &pos)
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{
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if (_graphs.isEmpty())
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return;
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qreal val = pos.x() / _slider->area().width();
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emit sliderPositionChanged(val);
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const QPainterPath &path = _graphs.at(0)->path();
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QPointF p = path.pointAtPercent(val);
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qreal r = (p.y() - path.boundingRect().bottom())
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/ path.boundingRect().height();
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_sliderInfo->setPos(QPointF(0, _slider->boundingRect().height() * r));
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_sliderInfo->setText(QString::number(-p.y() * _yScale, 'f', _precision));
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}
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qreal GraphView::sliderPosition() const
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{
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return _slider->pos().x() / _slider->area().width();
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}
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void GraphView::setSliderPosition(qreal pos)
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{
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_slider->setPos(pos * _slider->area().width(), 0);
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}
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void GraphView::newSliderPosition(const QPointF &pos)
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{
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if (_slider->area().contains(pos)) {
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_slider->setPos(pos);
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emitSliderPositionChanged(pos);
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}
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}
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void GraphView::addInfo(const QString &key, const QString &value)
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{
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_info->insert(key, value);
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}
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void GraphView::clearInfo()
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{
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_info->clear();
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}
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