├── .gitignore ├── CMakeLists.txt ├── LICENSE ├── README.md ├── example ├── CMakeLists.txt └── zoomlinechart │ ├── CMakeLists.txt │ └── main.cpp ├── rangelimitedvalueaxis.cpp ├── rangelimitedvalueaxis.h ├── res ├── horizontal_zoom.png ├── pan.png ├── rectangle_zoom.png ├── vertical_zoom.png ├── zoom_to_fit_all.png └── zoomable_chart_widget_resources.qrc ├── screenshots ├── hover.png ├── promote_to.png └── zoom_selector.png ├── zoomable_chart_widget.pri ├── zoomablechart.cpp ├── zoomablechart.h ├── zoomablechartview.cpp ├── zoomablechartview.h ├── zoomablechartwidget.cpp ├── zoomablechartwidget.h └── zoomablechartwidget.ui /.gitignore: -------------------------------------------------------------------------------- 1 | # C++ objects and libs 2 | *.slo 3 | *.lo 4 | *.o 5 | *.a 6 | *.la 7 | *.lai 8 | *.so 9 | *.dll 10 | *.dylib 11 | 12 | # Qt-es 13 | object_script.*.Release 14 | object_script.*.Debug 15 | *_plugin_import.cpp 16 | /.qmake.cache 17 | /.qmake.stash 18 | *.pro.user 19 | *.pro.user.* 20 | *.qbs.user 21 | *.qbs.user.* 22 | *.moc 23 | moc_*.cpp 24 | moc_*.h 25 | qrc_*.cpp 26 | ui_*.h 27 | *.qmlc 28 | *.jsc 29 | Makefile* 30 | *build-* 31 | 32 | # Qt unit tests 33 | target_wrapper.* 34 | 35 | # QtCreator 36 | *.autosave 37 | 38 | # QtCreator Qml 39 | *.qmlproject.user 40 | *.qmlproject.user.* 41 | 42 | # QtCreator CMake 43 | CMakeLists.txt.user* 44 | /build 45 | /.cache 46 | -------------------------------------------------------------------------------- /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | cmake_minimum_required(VERSION 3.10.0) 2 | project(zoomablechartwidget VERSION 0.1.0 LANGUAGES C CXX) 3 | 4 | # Determine if zoomablechart is built as a subproject (using add_subdirectory) 5 | # or if it is the master project. 6 | if (NOT DEFINED ZOOMABLECHART_MASTER_PROJECT) 7 | set(ZOOMABLECHART_MASTER_PROJECT OFF) 8 | if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR) 9 | set(ZOOMABLECHART_MASTER_PROJECT ON) 10 | message(STATUS "CMake version: ${CMAKE_VERSION}") 11 | endif () 12 | endif () 13 | 14 | 15 | find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets Charts) 16 | find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets Charts) 17 | 18 | add_library(zoomablechart 19 | rangelimitedvalueaxis.cpp 20 | rangelimitedvalueaxis.h 21 | 22 | zoomablechart.cpp 23 | zoomablechart.h 24 | 25 | zoomablechartview.cpp 26 | zoomablechartview.h 27 | 28 | zoomablechartwidget.cpp 29 | zoomablechartwidget.h 30 | zoomablechartwidget.ui 31 | ) 32 | 33 | set_target_properties(zoomablechart PROPERTIES 34 | AUTOMOC ON 35 | AUTOUIC ON 36 | AUTORCC ON 37 | ) 38 | 39 | target_link_libraries(zoomablechart PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Charts) 40 | target_include_directories(zoomablechart PUBLIC ./) 41 | 42 | if(ZOOMABLECHART_MASTER_PROJECT) 43 | add_subdirectory(example) 44 | endif() 45 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU LESSER GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | 9 | This version of the GNU Lesser General Public License incorporates 10 | the terms and conditions of version 3 of the GNU General Public 11 | License, supplemented by the additional permissions listed below. 12 | 13 | 0. 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Revised Versions of the GNU Lesser General Public License. 145 | 146 | The Free Software Foundation may publish revised and/or new versions 147 | of the GNU Lesser General Public License from time to time. Such new 148 | versions will be similar in spirit to the present version, but may 149 | differ in detail to address new problems or concerns. 150 | 151 | Each version is given a distinguishing version number. If the 152 | Library as you received it specifies that a certain numbered version 153 | of the GNU Lesser General Public License "or any later version" 154 | applies to it, you have the option of following the terms and 155 | conditions either of that published version or of any later version 156 | published by the Free Software Foundation. If the Library as you 157 | received it does not specify a version number of the GNU Lesser 158 | General Public License, you may choose any version of the GNU Lesser 159 | General Public License ever published by the Free Software Foundation. 160 | 161 | If the Library as you received it specifies that a proxy can decide 162 | whether future versions of the GNU Lesser General Public License shall 163 | apply, that proxy's public statement of acceptance of any version is 164 | permanent authorization for you to choose that version for the 165 | Library. 166 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Zoomable chart widget for Qt 2 | 3 | Wrapper widget around QChartView which provides basic zoom/pan/legend handling stuff 4 | 5 | ## Why? 6 | 7 | Because I got rid of configuring the QtCharts widget in each of my applications 8 | 9 | ### How to use it? 10 | 11 | Add this project to your Qt application as a submodule with: 12 | 13 | ``` 14 | git submodule add https://github.com/martonmiklos/qt_zoomable_chart_widget.git 15 | ``` 16 | 17 | Include it into your project by adding the follwing to your .pro file: 18 | 19 | ``` 20 | include(qt_zoomable_chart_widget/zoomable_chart_widget.pri) 21 | ``` 22 | 23 | Create you UI with QtDesigner (or Designer plugin in the QtCreator). 24 | Add your chart as a QWidget and then promote to the ZoomableChartWidget: 25 | 26 | ![Promoting widget](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/screenshots/promote_to.png "Promoting widget") 27 | 28 | You can access the underlying QtChart object via 29 | 30 | ``` 31 | ui->whateverIsMyWidgetName->chart() 32 | ``` 33 | 34 | You can add/remove series,axes do whatever else you do with a QtChart. 35 | 36 | ### Features 37 | 38 | #### Zoom mode 39 | There is a zoom mode selector combobox above the chart. I know this is a space wasting thing, I am planning to move this feature to a hamburger style button to the graph area's corner. 40 | 41 | ![Zoom mode selector](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/screenshots/zoom_selector.png "Zoom mode selector") 42 | 43 | You can select 4 zoom modes with it: 44 | 45 | - ![pan icon](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/res/pan.png) Pan mode: you can drag the graph content with pressed mouse button along the horizontal axes. If you press the Ctrl key you can do panning along the vertical axes. 46 | - ![rectangular icon](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/res/rectangle_zoom.png) Rectangular zoom mode 47 | - ![horizontal icon](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/res/horizontal_zoom.png) You can zoom into the graph contents on the horizontal axis with the mouse wheel. If you press the Ctrl key the zoom will be performed on the vertical axis. 48 | - ![vertical icon](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/res/vertical_zoom.png) You can zoom into the graph contents on the vertical axis with the mouse wheel. If you press the Ctrl key the zoom will be performed on the horizontal axis. 49 | 50 | #### Legend show/hide 51 | You can show/hide series by clicking on the Legend markers. Inspired by the [Legend markers Qt example)](https://doc.qt.io/qt-5/qtcharts-legendmarkers-example.html) 52 | 53 | Protip: by pressing the Shift you can show/hide multiple series by a single click 54 | 55 | #### Legend hover highlight 56 | When hovering the mouse over the legend markers the respective series line width will be doubled: 57 | ![Legend hover](https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/master/screenshots/hover.png "Legend hover") 58 | 59 | #### Limiting scrolling/zooming of QValueAxis 60 | You can limit the scroll/zooming ranges of QValueAxes by using RangeLimitedValueAxis. 61 | 62 | If you find this feature useful to be included in the Qt itself [please comment/vote on this issue.](https://bugreports.qt.io/browse/QTBUG-81759) 63 | -------------------------------------------------------------------------------- /example/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | 2 | 3 | add_subdirectory(zoomlinechart) 4 | 5 | -------------------------------------------------------------------------------- /example/zoomlinechart/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | 2 | find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets Charts) 3 | find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets Charts) 4 | 5 | add_executable(zoomlinechart main.cpp) 6 | 7 | set_target_properties(zoomlinechart PROPERTIES 8 | AUTOMOC ON 9 | AUTOUIC ON 10 | AUTORCC ON 11 | ) 12 | 13 | target_link_libraries(zoomlinechart PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Charts zoomablechart) -------------------------------------------------------------------------------- /example/zoomlinechart/main.cpp: -------------------------------------------------------------------------------- 1 | // based on https://doc.qt.io/Qt-6/qtcharts-zoomlinechart-example.html 2 | 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | 10 | #include 11 | #include 12 | 13 | int main(int argc, char *argv[]) 14 | { 15 | QApplication a(argc, argv); 16 | 17 | auto series = new QLineSeries; 18 | for (int i = 0; i < 500; i++) { 19 | QPointF p((qreal) i, qSin(M_PI / 50 * i) * 100); 20 | p.ry() += QRandomGenerator::global()->bounded(20); 21 | *series << p; 22 | } 23 | 24 | auto chart = new ZoomableChart; 25 | chart->addSeries(series); 26 | chart->setTitle("Zoom in/out example"); 27 | chart->setAnimationOptions(QChart::SeriesAnimations); 28 | chart->legend()->hide(); 29 | chart->createDefaultAxes(); 30 | 31 | 32 | QMainWindow window; 33 | window.resize(800, 600); 34 | window.grabGesture(Qt::PanGesture); 35 | window.grabGesture(Qt::PinchGesture); 36 | 37 | auto chartView = new ZoomableChartView(chart); 38 | chartView->setRenderHint(QPainter::Antialiasing); 39 | 40 | window.setCentralWidget(chartView); 41 | 42 | window.show(); 43 | 44 | return a.exec(); 45 | } 46 | -------------------------------------------------------------------------------- /rangelimitedvalueaxis.cpp: -------------------------------------------------------------------------------- 1 | #include "rangelimitedvalueaxis.h" 2 | 3 | RangeLimitedValueAxis::RangeLimitedValueAxis(QObject *parent) : 4 | QValueAxis(parent) 5 | { 6 | setProperty("rangeLimited", true); // This is a hack 7 | } 8 | 9 | void RangeLimitedValueAxis::setLowerLimit(qreal value) 10 | { 11 | if (m_limitLowerRange && value > m_upLimit) { 12 | m_limitLowerRange = false; 13 | return; 14 | } 15 | m_lowLimit = value; 16 | m_limitLowerRange = true; 17 | } 18 | 19 | void RangeLimitedValueAxis::setUpperLimit(qreal value) 20 | { 21 | if (m_limitLowerRange && m_lowLimit > value) { 22 | m_limitUpperRange = false; 23 | return; 24 | } 25 | m_upLimit = value; 26 | m_limitUpperRange = true; 27 | } 28 | 29 | void RangeLimitedValueAxis::disableLowerLimit() 30 | { 31 | m_limitLowerRange = false; 32 | } 33 | 34 | void RangeLimitedValueAxis::disableUpperLimit() 35 | { 36 | m_limitUpperRange = false; 37 | } 38 | 39 | bool RangeLimitedValueAxis::isLowerRangeLimited() const 40 | { 41 | return m_limitLowerRange; 42 | } 43 | 44 | bool RangeLimitedValueAxis::isUpperRangeLimited() const 45 | { 46 | return m_limitUpperRange; 47 | } 48 | 49 | qreal RangeLimitedValueAxis::lowerLimit() const 50 | { 51 | return m_lowLimit; 52 | } 53 | 54 | qreal RangeLimitedValueAxis::upperLimit() const 55 | { 56 | return m_upLimit; 57 | } 58 | -------------------------------------------------------------------------------- /rangelimitedvalueaxis.h: -------------------------------------------------------------------------------- 1 | #ifndef RANGELIMITEDVALUEAXIS_H 2 | #define RANGELIMITEDVALUEAXIS_H 3 | 4 | #include 5 | 6 | #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) 7 | QT_CHARTS_USE_NAMESPACE 8 | #endif 9 | 10 | 11 | class RangeLimitedValueAxis : public QValueAxis 12 | { 13 | public: 14 | RangeLimitedValueAxis(QObject *parent = nullptr); 15 | 16 | void setLowerLimit(qreal value); 17 | void setUpperLimit(qreal value); 18 | 19 | void disableLowerLimit(); 20 | void disableUpperLimit(); 21 | 22 | bool isLowerRangeLimited() const; 23 | bool isUpperRangeLimited() const; 24 | 25 | qreal lowerLimit() const; 26 | qreal upperLimit() const; 27 | 28 | protected: 29 | bool m_limitLowerRange = false; 30 | bool m_limitUpperRange = false; 31 | 32 | qreal m_lowLimit = 0.0; 33 | qreal m_upLimit = 0.0; 34 | }; 35 | 36 | #endif // RANGELIMITEDVALUEAXIS_H 37 | -------------------------------------------------------------------------------- /res/horizontal_zoom.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/res/horizontal_zoom.png -------------------------------------------------------------------------------- /res/pan.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/res/pan.png -------------------------------------------------------------------------------- /res/rectangle_zoom.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/res/rectangle_zoom.png -------------------------------------------------------------------------------- /res/vertical_zoom.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/res/vertical_zoom.png -------------------------------------------------------------------------------- /res/zoom_to_fit_all.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/res/zoom_to_fit_all.png -------------------------------------------------------------------------------- /res/zoomable_chart_widget_resources.qrc: -------------------------------------------------------------------------------- 1 | 2 | 3 | horizontal_zoom.png 4 | pan.png 5 | rectangle_zoom.png 6 | vertical_zoom.png 7 | zoom_to_fit_all.png 8 | 9 | 10 | -------------------------------------------------------------------------------- /screenshots/hover.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/screenshots/hover.png -------------------------------------------------------------------------------- /screenshots/promote_to.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/screenshots/promote_to.png -------------------------------------------------------------------------------- /screenshots/zoom_selector.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/martonmiklos/qt_zoomable_chart_widget/f610926f0c4411dd34c836b1cb7f66ca3e1631eb/screenshots/zoom_selector.png -------------------------------------------------------------------------------- /zoomable_chart_widget.pri: -------------------------------------------------------------------------------- 1 | 2 | 3 | FORMS += \ 4 | $$PWD/zoomablechartwidget.ui 5 | 6 | HEADERS += \ 7 | $$PWD/rangelimitedvalueaxis.h \ 8 | $$PWD/zoomablechart.h \ 9 | $$PWD/zoomablechartview.h \ 10 | $$PWD/zoomablechartwidget.h 11 | 12 | SOURCES += \ 13 | $$PWD/rangelimitedvalueaxis.cpp \ 14 | $$PWD/zoomablechart.cpp \ 15 | $$PWD/zoomablechartview.cpp \ 16 | $$PWD/zoomablechartwidget.cpp 17 | 18 | INCLUDEPATH += $$PWD 19 | 20 | RESOURCES += \ 21 | $$PWD/res/zoomable_chart_widget_resources.qrc 22 | -------------------------------------------------------------------------------- /zoomablechart.cpp: -------------------------------------------------------------------------------- 1 | #include "zoomablechart.h" 2 | 3 | ZoomableChart::ZoomableChart(QGraphicsItem *parent, Qt::WindowFlags wFlags) : 4 | QChart(parent, wFlags) 5 | { 6 | 7 | } 8 | 9 | void ZoomableChart::addSeries(QAbstractSeries *series) 10 | { 11 | QChart::addSeries(series); 12 | emit seriesAdded(series); 13 | } 14 | 15 | void ZoomableChart::removeSeries(QAbstractSeries *series) 16 | { 17 | QChart::removeSeries(series); 18 | emit seriesRemoved(series); 19 | } 20 | 21 | void ZoomableChart::addAxis(QAbstractAxis *axis, Qt::Alignment alignment) 22 | { 23 | QChart::addAxis(axis, alignment); 24 | #if (QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)) 25 | axis->setLabelsEditable(); 26 | #endif 27 | } 28 | -------------------------------------------------------------------------------- /zoomablechart.h: -------------------------------------------------------------------------------- 1 | #ifndef ZOOMABLECHART_H 2 | #define ZOOMABLECHART_H 3 | 4 | #include 5 | 6 | #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) 7 | QT_CHARTS_USE_NAMESPACE 8 | #endif 9 | 10 | 11 | class ZoomableChart : public QChart 12 | { 13 | Q_OBJECT 14 | public: 15 | ZoomableChart(QGraphicsItem *parent = nullptr, Qt::WindowFlags wFlags = Qt::WindowFlags()); 16 | void addSeries(QAbstractSeries *series); 17 | void removeSeries(QAbstractSeries *series); 18 | void addAxis(QAbstractAxis *axis, Qt::Alignment alignment); 19 | signals: 20 | void seriesAdded(QAbstractSeries *series); 21 | void seriesRemoved(QAbstractSeries *series); 22 | }; 23 | 24 | #endif // ZOOMABLECHART_H 25 | -------------------------------------------------------------------------------- /zoomablechartview.cpp: -------------------------------------------------------------------------------- 1 | #include "zoomablechartview.h" 2 | #include 3 | #include 4 | #include 5 | 6 | #include "rangelimitedvalueaxis.h" 7 | 8 | #include 9 | 10 | ZoomableChartView::ZoomableChartView(QWidget *parent) : 11 | QChartView(parent) 12 | { 13 | setRubberBand(QChartView::RectangleRubberBand); 14 | } 15 | 16 | 17 | ZoomableChartView::ZoomableChartView(QChart *chart, QWidget *parent) : 18 | QChartView(chart,parent) 19 | { 20 | setRubberBand(QChartView::RectangleRubberBand); 21 | } 22 | 23 | void ZoomableChartView::mousePressEvent(QMouseEvent *event) 24 | { 25 | m_isTouching = true; 26 | m_lastMousePos = event->localPos(); 27 | qWarning() << "Press" << m_lastMousePos; 28 | QChartView::mousePressEvent(event); 29 | } 30 | 31 | void ZoomableChartView::mouseMoveEvent(QMouseEvent *event) 32 | { 33 | if (!m_isTouching) 34 | return; 35 | 36 | if (dragMode() == ScrollHandDrag) { 37 | if (event->buttons() & Qt::LeftButton) { 38 | bool moveHorizontalAxis = false; 39 | for (const auto *axis : chart()->axes()) { 40 | if (axis->orientation() == Qt::Horizontal && isAxisTypeZoomableWithMouse(axis->type())) { 41 | moveHorizontalAxis = true; 42 | break; 43 | } 44 | } 45 | 46 | if (QGuiApplication::keyboardModifiers() & Qt::KeyboardModifier::ControlModifier) 47 | moveHorizontalAxis = !moveHorizontalAxis; 48 | 49 | if (moveHorizontalAxis) { 50 | qreal dx = -(event->localPos().x() - m_lastMousePos.x()); 51 | for (auto *series : this->chart()->series()) { 52 | for (const auto *axis : series->attachedAxes()) { 53 | if (axis->orientation() != Qt::Horizontal) 54 | continue; 55 | if (axis->property("rangeLimited").toBool()) { 56 | const auto *rangeLimitedAxis = static_cast(axis); 57 | if (rangeLimitedAxis->orientation() != Qt::Horizontal) 58 | continue; 59 | QPointF oldPoint = getSeriesCoordFromChartCoord(m_lastMousePos, series); 60 | QPointF newPoint = getSeriesCoordFromChartCoord(event->localPos(), series); 61 | qreal dxAxis = -(newPoint.x() - oldPoint.x()); 62 | if (rangeLimitedAxis->isLowerRangeLimited() 63 | && (rangeLimitedAxis->min() + dxAxis) < rangeLimitedAxis->lowerLimit()) { 64 | dxAxis = -(rangeLimitedAxis->min() - rangeLimitedAxis->lowerLimit()); 65 | if (qFuzzyIsNull(dxAxis)) { 66 | dx = 0.0; 67 | } else { 68 | QPointF dummyCoord(oldPoint.x() - dxAxis, m_lastMousePos.y()); 69 | dummyCoord = getChartCoordFromSeriesCoord(dummyCoord, series); 70 | dx = (m_lastMousePos.x() - dummyCoord.x()); 71 | } 72 | } 73 | 74 | 75 | if (rangeLimitedAxis->isUpperRangeLimited() 76 | && (rangeLimitedAxis->max() + dxAxis) > rangeLimitedAxis->upperLimit()) { 77 | dxAxis = -(rangeLimitedAxis->upperLimit() - rangeLimitedAxis->max()); 78 | if (qFuzzyIsNull(dxAxis)) { 79 | dx = 0.0; 80 | } else { 81 | QPointF dummyCoord(oldPoint.x() - dxAxis, m_lastMousePos.y()); 82 | dummyCoord = getChartCoordFromSeriesCoord(dummyCoord, series); 83 | dx = -(m_lastMousePos.x() - dummyCoord.x()); 84 | } 85 | } 86 | } 87 | } 88 | } 89 | chart()->scroll(dx, 0); 90 | } else { 91 | qreal dy = event->pos().y() - m_lastMousePos.y(); 92 | for (const auto series : this->chart()->series()) { 93 | for (const auto axis : series->attachedAxes()) { 94 | if (axis->orientation() != Qt::Vertical) 95 | continue; 96 | if (axis->property("rangeLimited").toBool()) { 97 | RangeLimitedValueAxis *rangeLimitedAxis = static_cast(axis); 98 | if (rangeLimitedAxis->orientation() != Qt::Vertical) 99 | continue; 100 | QPointF oldPoint = getSeriesCoordFromChartCoord(m_lastMousePos, series); 101 | QPointF newPoint = getSeriesCoordFromChartCoord(event->localPos(), series); 102 | qreal dyAxis = -(newPoint.y() - oldPoint.y()); 103 | if (rangeLimitedAxis->isLowerRangeLimited() 104 | && (rangeLimitedAxis->min() + dyAxis) < rangeLimitedAxis->lowerLimit()) { 105 | dyAxis = rangeLimitedAxis->min() - rangeLimitedAxis->lowerLimit(); 106 | if (qFuzzyIsNull(dyAxis)) { 107 | dy = 0.0; 108 | } else { 109 | QPointF dummyCoord(m_lastMousePos.x(), oldPoint.y() - dyAxis); 110 | dummyCoord = getChartCoordFromSeriesCoord(dummyCoord, series); 111 | dy = (m_lastMousePos.y() - dummyCoord.y()); 112 | } 113 | } 114 | 115 | if (rangeLimitedAxis->isUpperRangeLimited() 116 | && (rangeLimitedAxis->max() + dyAxis) > rangeLimitedAxis->upperLimit()) { 117 | dyAxis = rangeLimitedAxis->upperLimit() - rangeLimitedAxis->max(); 118 | if (qFuzzyIsNull(dyAxis)) { 119 | dy = 0.0; 120 | } else { 121 | QPointF dummyCoord(m_lastMousePos.x(), oldPoint.y() - dyAxis); 122 | dummyCoord = getChartCoordFromSeriesCoord(dummyCoord, series); 123 | dy = -(m_lastMousePos.y() - dummyCoord.y()); 124 | } 125 | } 126 | } 127 | } 128 | } 129 | chart()->scroll(0, dy); 130 | } 131 | } 132 | m_lastMousePos = event->pos(); 133 | } 134 | 135 | QChartView::mouseMoveEvent(event); 136 | } 137 | 138 | void ZoomableChartView::wheelEvent(QWheelEvent *event) 139 | { 140 | bool zoomHorizontalAxis = false; 141 | for (auto axis : chart()->axes()) { 142 | if (axis->orientation() == Qt::Horizontal && isAxisTypeZoomableWithMouse(axis->type())) { 143 | zoomHorizontalAxis = true; 144 | break; 145 | } 146 | } 147 | 148 | if (QGuiApplication::keyboardModifiers() & Qt::KeyboardModifier::ControlModifier) 149 | zoomHorizontalAxis = !zoomHorizontalAxis; 150 | 151 | if (zoomHorizontalAxis) { 152 | if (event->angleDelta().y() > 0) { 153 | zoomX(2, event->position().x() - chart()->plotArea().x()); 154 | } else if (event->angleDelta().y() < 0) { 155 | zoomX(0.5, event->position().x() - chart()->plotArea().x()); 156 | } 157 | } else { 158 | if (event->angleDelta().y() > 0) { 159 | zoomY(2, event->position().y() - chart()->plotArea().y()); 160 | } else if (event->angleDelta().y() < 0) { 161 | zoomY(0.5, event->position().y() - chart()->plotArea().y()); 162 | } 163 | } 164 | } 165 | 166 | bool ZoomableChartView::isAxisTypeZoomableWithMouse(const QAbstractAxis::AxisType type) 167 | { 168 | return (type == QAbstractAxis::AxisTypeValue 169 | || type == QAbstractAxis::AxisTypeLogValue 170 | || type == QAbstractAxis::AxisTypeDateTime); 171 | } 172 | 173 | QPointF ZoomableChartView::getSeriesCoordFromChartCoord(const QPointF &chartPos, QAbstractSeries *series) const 174 | { 175 | auto const chartItemPos = chart()->mapFromScene(chartPos); 176 | auto const valueGivenSeries = chart()->mapToValue(chartItemPos, series); 177 | return valueGivenSeries; 178 | } 179 | 180 | QPointF ZoomableChartView::getChartCoordFromSeriesCoord(const QPointF &seriesPos, QAbstractSeries *series) const 181 | { 182 | QPointF ret = chart()->mapToPosition(seriesPos, series); 183 | ret = chart()->mapFromScene(ret); 184 | return ret; 185 | } 186 | 187 | ZoomableChartView::ZoomMode ZoomableChartView::zoomMode() const 188 | { 189 | return m_zoomMode; 190 | } 191 | 192 | void ZoomableChartView::setZoomMode(const ZoomMode &zoomMode) 193 | { 194 | if (m_zoomMode != zoomMode) { 195 | m_zoomMode = zoomMode; 196 | switch (zoomMode) { 197 | case Pan: 198 | setRubberBand(QChartView::NoRubberBand); 199 | setDragMode(QChartView::ScrollHandDrag); 200 | break; 201 | case RectangleZoom: 202 | setRubberBand(QChartView::RectangleRubberBand); 203 | setDragMode(QChartView::NoDrag); 204 | break; 205 | case HorizontalZoom: 206 | setRubberBand(QChartView::HorizontalRubberBand); 207 | setDragMode(QChartView::NoDrag); 208 | break; 209 | case VerticalZoom: 210 | setRubberBand(QChartView::VerticalRubberBand); 211 | setDragMode(QChartView::NoDrag); 212 | break; 213 | } 214 | } 215 | } 216 | 217 | void ZoomableChartView::zoomX(qreal factor, qreal xcenter) 218 | { 219 | QRectF rect = chart()->plotArea(); 220 | qreal widthOriginal = rect.width(); 221 | rect.setWidth(widthOriginal / factor); 222 | qreal centerScale = (xcenter / widthOriginal); 223 | 224 | qreal leftOffset = (xcenter - (rect.width() * centerScale) ); 225 | 226 | rect.moveLeft(rect.x() + leftOffset); 227 | chart()->zoomIn(rect); 228 | } 229 | 230 | void ZoomableChartView::zoomX(qreal factor) 231 | { 232 | QRectF rect = chart()->plotArea(); 233 | qreal widthOriginal = rect.width(); 234 | QPointF center_orig = rect.center(); 235 | 236 | rect.setWidth(widthOriginal / factor); 237 | 238 | rect.moveCenter(center_orig); 239 | 240 | chart()->zoomIn(rect); 241 | } 242 | 243 | void ZoomableChartView::zoomY(qreal factor, qreal ycenter) 244 | { 245 | QRectF rect = chart()->plotArea(); 246 | qreal heightOriginal = rect.height(); 247 | rect.setHeight(heightOriginal / factor); 248 | qreal centerScale = (ycenter / heightOriginal); 249 | 250 | qreal topOffset = (ycenter - (rect.height() * centerScale) ); 251 | 252 | rect.moveTop(rect.x() + topOffset); 253 | chart()->zoomIn(rect); 254 | } 255 | 256 | void ZoomableChartView::zoomY(qreal factor) 257 | { 258 | QRectF rect = chart()->plotArea(); 259 | qreal heightOriginal = rect.height(); 260 | QPointF center_orig = rect.center(); 261 | 262 | rect.setHeight(heightOriginal / factor); 263 | 264 | rect.moveCenter(center_orig); 265 | 266 | chart()->zoomIn(rect); 267 | } 268 | 269 | 270 | void ZoomableChartView::mouseReleaseEvent(QMouseEvent *event) 271 | { 272 | m_isTouching = false; 273 | QChartView::mouseReleaseEvent(event); 274 | } 275 | 276 | //![1] 277 | void ZoomableChartView::keyPressEvent(QKeyEvent *event) 278 | { 279 | auto resetZoom = [this]()-> void 280 | { 281 | // return if empty 282 | if(chart()->series().empty()) return; 283 | 284 | auto seriesAbstract = chart()->series().at(0); 285 | auto xySeries = dynamic_cast(seriesAbstract); 286 | if(xySeries) 287 | { 288 | auto const points = xySeries->points(); 289 | auto [point_minX, point_maxX] = std::minmax_element(points.begin(), points.end(), 290 | [](const QPointF p1, const QPointF p2){ 291 | return p1.x() < p2.y(); 292 | }); 293 | 294 | auto [point_minY, point_maxY] = std::minmax_element(points.begin(), points.end(), 295 | [](const QPointF p1, const QPointF p2){ 296 | return p1.y() < p2.y(); 297 | }); 298 | 299 | chart()->axes(Qt::Horizontal).first()->setRange(point_minX->x() , point_maxX->x()); 300 | chart()->axes(Qt::Vertical).first()->setRange(point_minY->y(), point_maxY->y()); 301 | } 302 | }; 303 | 304 | switch (event->key()) { 305 | case Qt::Key_Plus: 306 | chart()->zoomIn(); 307 | break; 308 | case Qt::Key_Minus: 309 | chart()->zoomOut(); 310 | break; 311 | //![1] 312 | case Qt::Key_Left: 313 | chart()->scroll(-10, 0); 314 | break; 315 | case Qt::Key_Right: 316 | chart()->scroll(10, 0); 317 | break; 318 | case Qt::Key_Up: 319 | chart()->scroll(0, 10); 320 | break; 321 | case Qt::Key_Down: 322 | chart()->scroll(0, -10); 323 | break; 324 | case Qt::Key_Question: 325 | resetZoom(); 326 | break; 327 | default: 328 | QGraphicsView::keyPressEvent(event); 329 | break; 330 | } 331 | } 332 | -------------------------------------------------------------------------------- /zoomablechartview.h: -------------------------------------------------------------------------------- 1 | #ifndef CHARTVIEW_H 2 | #define CHARTVIEW_H 3 | 4 | #include 5 | #include 6 | 7 | #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) 8 | QT_CHARTS_USE_NAMESPACE 9 | #endif 10 | 11 | //![1] 12 | class ZoomableChartView : public QChartView 13 | //![1] 14 | { 15 | public: 16 | enum ZoomMode { 17 | Pan, 18 | RectangleZoom, 19 | VerticalZoom, 20 | HorizontalZoom 21 | }; 22 | 23 | ZoomableChartView(QWidget *parent = 0); 24 | ZoomableChartView(QChart *chart, QWidget *parent = nullptr); 25 | 26 | void zoomX(qreal factor, qreal xcenter); 27 | void zoomX(qreal factor); 28 | 29 | void zoomY(qreal factor, qreal ycenter); 30 | void zoomY(qreal factor); 31 | 32 | //![2] 33 | ZoomMode zoomMode() const; 34 | void setZoomMode(const ZoomMode &zoomMode); 35 | 36 | 37 | protected: 38 | void mousePressEvent(QMouseEvent *event); 39 | void mouseMoveEvent(QMouseEvent *event); 40 | void mouseReleaseEvent(QMouseEvent *event); 41 | void keyPressEvent(QKeyEvent *event); 42 | void wheelEvent(QWheelEvent *event); 43 | //![2] 44 | 45 | private: 46 | 47 | bool m_isTouching = false; 48 | QPointF m_lastMousePos; 49 | ZoomMode m_zoomMode = RectangleZoom; 50 | 51 | static bool isAxisTypeZoomableWithMouse(const QAbstractAxis::AxisType type); 52 | QPointF getSeriesCoordFromChartCoord(const QPointF & mousePos, QAbstractSeries *series) const; 53 | QPointF getChartCoordFromSeriesCoord(const QPointF & seriesPos, QAbstractSeries *series) const; 54 | }; 55 | 56 | #endif 57 | -------------------------------------------------------------------------------- /zoomablechartwidget.cpp: -------------------------------------------------------------------------------- 1 | #include "zoomablechartwidget.h" 2 | #include "ui_zoomablechartwidget.h" 3 | 4 | #include 5 | #include 6 | 7 | #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) 8 | QT_CHARTS_USE_NAMESPACE 9 | #endif 10 | 11 | 12 | 13 | ZoomableChartWidget::ZoomableChartWidget(QWidget *parent) : 14 | QWidget(parent), 15 | ui(new Ui::ZoomableChartWidget) 16 | { 17 | ui->setupUi(this); 18 | 19 | QIcon panIcon; 20 | panIcon.addFile(QStringLiteral(":/icons/pan.png"), QSize(), QIcon::Normal, QIcon::Off); 21 | ui->comboBoxZoomMode->addItem(panIcon, QString(), ZoomableChartView::Pan); 22 | 23 | QIcon rectZoomIcon; 24 | rectZoomIcon.addFile(QStringLiteral(":/icons/rectangle_zoom.png"), QSize(), QIcon::Normal, QIcon::Off); 25 | ui->comboBoxZoomMode->addItem(rectZoomIcon, QString(), ZoomableChartView::RectangleZoom); 26 | 27 | QIcon vZoomIcon; 28 | vZoomIcon.addFile(QStringLiteral(":/icons/vertical_zoom.png"), QSize(), QIcon::Normal, QIcon::Off); 29 | ui->comboBoxZoomMode->addItem(vZoomIcon, QString(), ZoomableChartView::VerticalZoom); 30 | 31 | QIcon hZoomIcon; 32 | hZoomIcon.addFile(QStringLiteral(":/icons/horizontal_zoom.png"), QSize(), QIcon::Normal, QIcon::Off); 33 | ui->comboBoxZoomMode->addItem(hZoomIcon, QString(), ZoomableChartView::HorizontalZoom); 34 | 35 | ui->chartView->setZoomMode(ZoomableChartView::Pan); 36 | 37 | m_chart = new ZoomableChart(); 38 | ui->chartView->setChart(m_chart); 39 | connect(m_chart, &ZoomableChart::seriesAdded, this, &ZoomableChartWidget::seriesAdded); 40 | connect(m_chart, &ZoomableChart::seriesRemoved, this, &ZoomableChartWidget::seriesRemoved); 41 | } 42 | 43 | ZoomableChartWidget::~ZoomableChartWidget() 44 | { 45 | delete m_chart; 46 | delete ui; 47 | } 48 | 49 | void ZoomableChartWidget::on_comboBoxZoomMode_activated(int index) 50 | { 51 | ui->chartView->setZoomMode(static_cast(ui->comboBoxZoomMode->itemData(index).toInt())); 52 | } 53 | 54 | void ZoomableChartWidget::legendMarkerClicked() 55 | { 56 | static QLegendMarker *m_lastClickedMarker = nullptr; 57 | auto* marker = qobject_cast(sender()); 58 | Q_ASSERT(marker); 59 | 60 | // Toggle visibility of series 61 | setSeriesVisible(marker->series(), !marker->series()->isVisible()); 62 | if (m_lastClickedMarker 63 | && (m_lastClickedMarker->series()->isVisible() == marker->series()->isVisible()) 64 | && (QApplication::keyboardModifiers() & Qt::ShiftModifier)) { 65 | auto markers = m_chart->legend()->markers(); 66 | int startIndex = markers.indexOf(marker); 67 | int lastIndex = markers.indexOf(m_lastClickedMarker); 68 | if (startIndex != -1 && lastIndex != -1) { 69 | if (startIndex > lastIndex) { 70 | auto tmp = lastIndex; 71 | lastIndex = startIndex; 72 | startIndex = tmp; 73 | } 74 | 75 | for (int i = (startIndex + 1); iseries(), !markers[i]->series()->isVisible()); 77 | } 78 | } 79 | } 80 | m_lastClickedMarker = marker; 81 | connect(m_lastClickedMarker, &QLegendMarker::destroyed, this, [this]() {m_lastClickedMarker = nullptr;}); 82 | } 83 | 84 | void ZoomableChartWidget::legendMarkerHovered(bool hover) 85 | { 86 | auto* marker = qobject_cast(sender()); 87 | Q_ASSERT(marker); 88 | 89 | QFont font = marker->font(); 90 | font.setBold(hover); 91 | marker->setFont(font); 92 | 93 | if (marker->series()->type() == QAbstractSeries::SeriesTypeLine) { 94 | auto series = qobject_cast(marker->series()); 95 | auto pen = series->pen(); 96 | pen.setWidth(hover ? (pen.width() * 2) : (pen.width() / 2)); 97 | series->setPen(pen); 98 | } 99 | } 100 | 101 | ZoomableChart *ZoomableChartWidget::chart() const 102 | { 103 | return m_chart; 104 | } 105 | 106 | ZoomableChartView *ZoomableChartWidget::chartView() const 107 | { 108 | return ui->chartView; 109 | } 110 | 111 | void ZoomableChartWidget::addToolWidget(QWidget *widget) 112 | { 113 | ui->horizontalLayoutToolbar->insertWidget(1, widget); 114 | } 115 | 116 | void ZoomableChartWidget::setSeriesVisible(QAbstractSeries *series, bool visible) 117 | { 118 | series->setVisible(visible); 119 | const auto markers = m_chart->legend()->markers(series); 120 | for (auto *marker : markers) { 121 | // Turn legend marker back to visible, since hiding series also hides the marker 122 | // and we don't want it to happen now. 123 | marker->setVisible(true); 124 | 125 | // Dim the marker, if series is not visible 126 | qreal alpha = visible ? 1.0 : 0.5; 127 | QColor color; 128 | QBrush brush = marker->labelBrush(); 129 | color = brush.color(); 130 | color.setAlphaF(alpha); 131 | brush.setColor(color); 132 | marker->setLabelBrush(brush); 133 | 134 | brush = marker->brush(); 135 | color = brush.color(); 136 | color.setAlphaF(alpha); 137 | brush.setColor(color); 138 | marker->setBrush(brush); 139 | 140 | QPen pen = marker->pen(); 141 | color = pen.color(); 142 | color.setAlphaF(alpha); 143 | pen.setColor(color); 144 | marker->setPen(pen); 145 | } 146 | 147 | for (QAbstractAxis *axis : m_chart->axes(Qt::Vertical)) { 148 | bool hideAxis = true; 149 | for (auto *series : m_chart->series()) { 150 | for (const auto *attachedAxis : series->attachedAxes()) { 151 | if (series->isVisible() && attachedAxis == axis) { 152 | hideAxis = false; 153 | break; 154 | } 155 | } 156 | if (!hideAxis) 157 | break; 158 | } 159 | axis->setVisible(!hideAxis); 160 | } 161 | } 162 | 163 | void ZoomableChartWidget::seriesAdded(QAbstractSeries *series) 164 | { 165 | // Connect all markers to handler 166 | const auto markers = m_chart->legend()->markers(series); 167 | for (auto marker : markers) { 168 | QObject::connect(marker, &QLegendMarker::clicked, 169 | this, &ZoomableChartWidget::legendMarkerClicked); 170 | QObject::connect(marker, &QLegendMarker::hovered, 171 | this, &ZoomableChartWidget::legendMarkerHovered); 172 | } 173 | } 174 | 175 | void ZoomableChartWidget::seriesRemoved(QAbstractSeries *series) 176 | { 177 | // Connect all markers to handler 178 | const auto markers = m_chart->legend()->markers(series); 179 | for (auto marker : markers) { 180 | QObject::disconnect(marker, &QLegendMarker::clicked, 181 | this, &ZoomableChartWidget::legendMarkerClicked); 182 | QObject::disconnect(marker, &QLegendMarker::hovered, 183 | this, &ZoomableChartWidget::legendMarkerHovered); 184 | } 185 | } 186 | 187 | 188 | void ZoomableChartWidget::on_toolButtonFitInView_clicked() 189 | { 190 | QHash xmin, xmax, ymin, ymax; 191 | // loop on all axes (both vetival and horizontal) 192 | for (const QAbstractAxis *axis : m_chart->axes()) { 193 | // only QValueAxis supported at the moment 194 | if (axis->type() != QAbstractAxis::AxisTypeValue) 195 | continue; 196 | 197 | // loop on all series attached to the axes and look for each min max point 198 | for (auto *series : m_chart->series()) { 199 | // at the moment only QLineSeries is supported for zoom to fit 200 | if (series->type() != QAbstractSeries::SeriesTypeLine) 201 | continue; 202 | 203 | if (!xmin.contains(axis)) 204 | xmin[axis] = std::numeric_limits::max(); 205 | if (!xmax.contains(axis)) 206 | xmax[axis] = -std::numeric_limits::max(); 207 | if (!ymin.contains(axis)) 208 | ymin[axis] = std::numeric_limits::max(); 209 | if (!ymax.contains(axis)) 210 | ymax[axis] = -std::numeric_limits::max(); 211 | 212 | for (const auto *attachedAxis : series->attachedAxes()) { 213 | if (series->isVisible() && attachedAxis == axis) { 214 | auto lineSeries = static_cast(series); 215 | for (const auto pt : lineSeries->points()) { 216 | if (pt.x() < xmin[axis]) 217 | xmin[axis] = pt.x(); 218 | if (pt.x() > xmax[axis]) 219 | xmax[axis] = pt.x(); 220 | if (pt.y() < ymin[axis]) 221 | ymin[axis] = pt.y(); 222 | if (pt.y() > ymax[axis]) 223 | ymax[axis] = pt.y(); 224 | } 225 | break; 226 | } 227 | } 228 | } 229 | } 230 | 231 | for (QAbstractAxis *axis : m_chart->axes()) { 232 | if (axis->type() != QAbstractAxis::AxisTypeValue) 233 | continue; 234 | if (axis->alignment() == Qt::Horizontal) { 235 | if (xmin.contains(axis)) 236 | axis->setMin(xmin[axis]); 237 | 238 | if (xmax.contains(axis)) 239 | axis->setMax(xmax[axis]); 240 | } else if (axis->alignment() == Qt::Vertical) { 241 | if (ymin.contains(axis)) 242 | axis->setMin(ymin[axis]); 243 | 244 | if (ymax.contains(axis)) 245 | axis->setMax(ymax[axis]); 246 | } 247 | } 248 | } 249 | -------------------------------------------------------------------------------- /zoomablechartwidget.h: -------------------------------------------------------------------------------- 1 | #ifndef ZOOMABLECHARTWIDGET_H 2 | #define ZOOMABLECHARTWIDGET_H 3 | 4 | #include "zoomablechart.h" 5 | #include "zoomablechartview.h" 6 | 7 | #include 8 | #include 9 | 10 | #include 11 | #include 12 | 13 | #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) 14 | QT_CHARTS_USE_NAMESPACE 15 | #endif 16 | 17 | namespace Ui { 18 | class ZoomableChartWidget; 19 | } 20 | 21 | class ZoomableChartWidget : public QWidget 22 | { 23 | Q_OBJECT 24 | 25 | public: 26 | explicit ZoomableChartWidget(QWidget *parent = nullptr); 27 | ~ZoomableChartWidget(); 28 | 29 | ZoomableChart *chart() const; 30 | ZoomableChartView *chartView() const; 31 | 32 | void addToolWidget(QWidget *widget); 33 | 34 | public slots: 35 | void setSeriesVisible(QAbstractSeries *series, bool visible = true); 36 | 37 | private slots: 38 | void on_comboBoxZoomMode_activated(int index); 39 | void legendMarkerClicked(); 40 | void legendMarkerHovered(bool hover); 41 | void seriesAdded(QAbstractSeries *series); 42 | void seriesRemoved(QAbstractSeries *series); 43 | void on_toolButtonFitInView_clicked(); 44 | 45 | private: 46 | Ui::ZoomableChartWidget *ui; 47 | ZoomableChart *m_chart = nullptr; 48 | }; 49 | 50 | #endif // ZOOMABLECHARTWIDGET_H 51 | -------------------------------------------------------------------------------- /zoomablechartwidget.ui: -------------------------------------------------------------------------------- 1 | 2 | 3 | ZoomableChartWidget 4 | 5 | 6 | 7 | 0 8 | 0 9 | 400 10 | 300 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | Qt::Horizontal 23 | 24 | 25 | 26 | 40 27 | 20 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | Adjust zoom to fit all 36 | 37 | 38 | ... 39 | 40 | 41 | 42 | :/icons/zoom_to_fit_all.png:/icons/zoom_to_fit_all.png 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 48 51 | 16777215 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | ZoomableChartView 66 | QGraphicsView 67 |
zoomablechartview.h
68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | --------------------------------------------------------------------------------