mirror of https://github.com/qt/qtgraphs.git
Add graph printing example
Shows how to print a graph to a pdf and printer
Fixes: QTBUG-124213
Change-Id: I1835b77fc5e80d065e64b69b47002932487dfe68
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
(cherry picked from commit 91f30ef4a0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Sakaria Pouke
Qt Cherry-pick Bot
parent
1994506ff3
commit
1c9d3ac1c2
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@ -12,7 +12,7 @@ project(QtGraphs
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)
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find_package(Qt6 ${PROJECT_VERSION} CONFIG REQUIRED COMPONENTS BuildInternals)
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find_package(Qt6 ${PROJECT_VERSION} CONFIG OPTIONAL_COMPONENTS Core Quick Gui Widgets QuickTest QuickWidgets Test Quick3D QuickShapesPrivate)
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find_package(Qt6 ${PROJECT_VERSION} CONFIG OPTIONAL_COMPONENTS Core Quick Gui Widgets QuickTest QuickWidgets Test Quick3D QuickShapesPrivate PrintSupport)
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macro(assertTargets)
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foreach(qtTarget IN ITEMS ${ARGN})
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@ -11,4 +11,8 @@ if(QT_FEATURE_graphs_2d)
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add_subdirectory(graphs/2d)
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endif()
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if(QT_FEATURE_graphs_2d AND QT_FEATURE_graphs_3d AND TARGET Qt6::PrintSupport)
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add_subdirectory(graphs/graphprinting)
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endif()
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qt_examples_build_end()
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@ -0,0 +1,57 @@
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# Copyright (C) 2024 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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cmake_minimum_required(VERSION 3.16)
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project(graphprinting LANGUAGES CXX)
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set(CMAKE_INCLUDE_CURRENT_DIR ON)
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set(CMAKE_AUTOMOC ON)
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set(CMAKE_AUTORCC ON)
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set(CMAKE_AUTOUIC ON)
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if(NOT DEFINED INSTALL_EXAMPLESDIR)
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set(INSTALL_EXAMPLESDIR "examples")
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endif()
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set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}")
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find_package(Qt6 COMPONENTS Core)
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find_package(Qt6 COMPONENTS Gui)
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find_package(Qt6 COMPONENTS Quick)
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find_package(Qt6 COMPONENTS Quick3D)
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find_package(Qt6 COMPONENTS Graphs)
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qt_add_executable(graphprinting
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main.cpp
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)
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set_target_properties(graphprinting PROPERTIES
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WIN32_EXECUTABLE TRUE
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MACOSX_BUNDLE TRUE
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)
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target_link_libraries(graphprinting PRIVATE
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Qt::Core
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Qt::Gui
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Qt::Quick
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Qt::Quick3D
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Qt::Graphs
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Qt::PrintSupport
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)
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qt6_add_qml_module(graphprinting
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URI GraphPrintingExample
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NO_RESOURCE_TARGET_PATH
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SOURCES
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graphprinter.h graphprinter.cpp
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QML_FILES
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qml/graphprinting/main.qml
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qml/graphprinting/Graph2D.qml
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qml/graphprinting/Graph3D.qml
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)
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install(TARGETS graphprinting
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RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
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BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
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LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
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)
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Binary file not shown.
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After Width: | Height: | Size: 25 KiB |
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@ -0,0 +1,113 @@
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
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/*!
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\example graphprinting
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\meta tags {Graphs, GraphsView, LineSeries, Bars3D}
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\examplecategory {Data Visualization}
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\title Graph Printing
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\ingroup qtgraphs_qmlexamples
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\ingroup qtgraphs_qmlexamples_3D
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\brief Printing a 2D or 3D Graph to a PDF.
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The \e {Graph Printing} example demonstrates how to print or export to PDF
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2D and 3D graphs.
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\image graphprinting-example.png
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\include examples-run.qdocinc
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\section1 GraphPrinter class
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The printing functionality is implemented in the \c GraphPrinter class. The
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class exposes these functions:
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\list
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\li The \c generatePDF function, which works as follows.
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\list
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\li Sets up the output PDF file.
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The function instantiates \l QPdfWriter with a "graph.pdf" file
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pointed in the specified folder. The function also specifies the
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options for the exported PDF file: title, resolution, page size,
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and margins.
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\snippet graphprinting/graphprinter.cpp 0
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\li Sets up image processing.
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The function creates a \l QPainter referring to the previously
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created \l QPdfWriter.
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To ensure the graph is printed correctly, it is scaled to the
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painter's viewport size with the original aspect ratio.
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The painter's rendering hint is set to lossless image rendering.
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After this, the function draws the image to the PDF file.
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\snippet graphprinting/graphprinter.cpp 1
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\endlist
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\li The \c print function, which works like the \c generatePDF function,
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but creates a \l QPainter referring a \QPrinter instance:
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\snippet graphprinting/graphprinter.cpp 2
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\li The \c getPrinters function returns a list of available printers.
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\snippet graphprinting/graphprinter.cpp 3
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\endlist
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\section1 Application setup
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In addition to the application setup code, the \c {main.cpp} file contains
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code that creates a new instance of the \l {GraphPrinter class} and makes
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it reachable from the QML code.
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\snippet graphprinting/main.cpp 0
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\section1 Setting up the layout and image capture
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The 2D and 3D graphs are laid out in a Stacklayout. Users can navigate it
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with a TabBar.
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\snippet graphprinting/qml/graphprinting/main.qml 0
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The FolderDialog component is used to select a folder for saving an
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exported file. This component has no visual representation in the
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application layout, but its API is accessible from the current QML file.
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The Button invokes a folder dialog.
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\snippet graphprinting/qml/graphprinting/main.qml 1.1
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\dots
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\snippet graphprinting/qml/graphprinting/main.qml 1.2
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A custom printing dialog is created for selecting a printer.
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The Dialog retrieves the list of available printers and displays them in a
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list view.
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\snippet graphprinting/qml/graphprinting/main.qml 2.1
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\dots
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\snippet graphprinting/qml/graphprinting/main.qml 2.2
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The \uicontrol {Save to PDF} button and \uicontrol {Print} button in the
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printing dialog run the following code:
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\list
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\li Capture an image using the \c grabToImage method.
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The current graph is the Stacklayout's item at the current index.
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\li In the \c grabToImage parameters, we specify the callback as the
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\c generatePDF or \c print function in the \c GraphPrinter class.
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For the size, the code makes the image render at a 7282 by 4096
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resolution. For 3D graphs, the item must also be expanded
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for the duration of printing.
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\endlist
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\snippet graphprinting/qml/graphprinting/main.qml 3.1
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\dots
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\snippet graphprinting/qml/graphprinting/main.qml 3.2
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*/
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@ -0,0 +1,62 @@
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "graphprinter.h"
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#include <QtGui/qtransform.h>
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#include <QtPrintSupport>
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GraphPrinter::GraphPrinter(QObject *parent)
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: QObject(parent)
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{}
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GraphPrinter::~GraphPrinter() {}
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void GraphPrinter::generatePDF(const QUrl &path, const QImage &image)
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{
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//! [0]
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const QFile file = QFile(path.toLocalFile() + QStringLiteral("/graph.pdf"));
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QPdfWriter writer(file.fileName());
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writer.setResolution(90);
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writer.setTitle("Graph");
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writer.setPageSize(QPageSize(image.size()));
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writer.setPageMargins(QMarginsF(0, 0, 0, 0));
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writer.newPage();
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//! [0]
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//! [1]
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QPainter painter(&writer);
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const QImage finalImage = image.scaled(painter.viewport().size(), Qt::KeepAspectRatio);
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painter.setRenderHint(QPainter::LosslessImageRendering);
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painter.drawImage(finalImage.rect(), finalImage);
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//! [1]
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qInfo("printed PDF to %ls", qUtf16Printable(file.fileName()));
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}
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//! [2]
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void GraphPrinter::print(const QImage &image, const QString printerName)
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{
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QPrinterInfo printInfo = QPrinterInfo::printerInfo(printerName);
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if (printInfo.isNull()) {
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qWarning("%ls is not a valid printer", qUtf16Printable(printerName));
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return;
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}
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QPrinter printer(printInfo, QPrinter::HighResolution);
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printer.setOutputFormat(QPrinter::NativeFormat);
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QPainter painter(&printer);
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const QImage finalImage = image.scaled(painter.viewport().size(), Qt::KeepAspectRatio);
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painter.setRenderHint(QPainter::LosslessImageRendering);
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painter.drawImage(finalImage.rect(), finalImage);
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qInfo("printed image with %ls", qUtf16Printable(printerName));
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}
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//! [2]
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//! [3]
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QStringList GraphPrinter::getPrinters()
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{
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return QPrinterInfo::availablePrinterNames();
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}
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//! [3]
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@ -0,0 +1,24 @@
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#ifndef GRAPHPRINTER_H
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#define GRAPHPRINTER_H
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#include <QtCore/qfile.h>
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#include <QtGui>
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#include <QtPrintSupport>
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#include <QtQml/qqmlregistration.h>
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class GraphPrinter : public QObject {
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Q_OBJECT
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QML_ELEMENT
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public:
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explicit GraphPrinter(QObject *parent = 0);
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~GraphPrinter() override;
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Q_INVOKABLE void generatePDF(const QUrl &path, const QImage &image);
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Q_INVOKABLE void print(const QImage &image, const QString printerName);
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Q_INVOKABLE QStringList getPrinters();
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};
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#endif // GRAPHPRINTER_H
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@ -0,0 +1,38 @@
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QtGui/qguiapplication.h>
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#include <QtQml/qqmlcontext.h>
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#include <QtQml/qqmlengine.h>
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#include <QtQuick/qquickview.h>
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#include "graphprinter.h"
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int main(int argc, char *argv[]) {
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QGuiApplication app(argc, argv);
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QQuickView viewer;
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// The following are needed to make examples run without having to install the
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// module in desktop environments.
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#ifdef Q_OS_WIN
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QString extraImportPath(QStringLiteral("%1/../../../../%2"));
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#else
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QString extraImportPath(QStringLiteral("%1/../../../%2"));
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#endif
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viewer.engine()->addImportPath(extraImportPath.arg(
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QGuiApplication::applicationDirPath(), QString::fromLatin1("qml")));
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viewer.setTitle(QStringLiteral("Graph Printing"));
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//! [0]
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GraphPrinter graphPrinter;
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viewer.rootContext()->setContextProperty("graphPrinter", &graphPrinter);
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//! [0]
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viewer.setMinimumSize({1280, 720});
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viewer.setSource(QUrl("qrc:/qml/graphprinting/main.qml"));
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viewer.setResizeMode(QQuickView::SizeRootObjectToView);
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viewer.setColor("black");
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viewer.show();
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return app.exec();
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}
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@ -0,0 +1,80 @@
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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import QtQuick
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import QtGraphs
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Rectangle {
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id: graphContainer
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width: 1280
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height: 720
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color: "white"
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GraphsView {
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anchors.fill: parent
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anchors.margins: 16
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theme: GraphsTheme {
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grid.mainColor: "darkgrey"
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grid.subColor: "lightgrey"
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labelTextColor: "black"
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plotAreaBackgroundColor: "white"
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backgroundColor: "white"
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}
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axisX: ValueAxis {
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max: 5
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tickInterval: 1
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subTickCount: 9
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labelDecimals: 1
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}
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axisY: ValueAxis {
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max: 10
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tickInterval: 1
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subTickCount: 4
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labelDecimals: 1
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}
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//! [linegraph]
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//! [linemarker]
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component Marker : Rectangle {
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width: 8
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height: 8
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color: "#ffffff"
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radius: width * 0.5
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border.width: 4
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border.color: "#000000"
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}
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//! [linemarker]
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//! [lineseries1]
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LineSeries {
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id: lineSeries1
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width: 4
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pointDelegate: Marker { }
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color: "black"
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XYPoint { x: 0; y: 0 }
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XYPoint { x: 1; y: 2.1 }
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XYPoint { x: 2; y: 3.3 }
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XYPoint { x: 3; y: 2.1 }
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XYPoint { x: 4; y: 4.9 }
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XYPoint { x: 5; y: 3.0 }
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}
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//! [lineseries1]
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//! [lineseries2]
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LineSeries {
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id: lineSeries2
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width: 4
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pointDelegate: Marker { }
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color: "black"
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XYPoint { x: 0; y: 5.0 }
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XYPoint { x: 1; y: 3.3 }
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XYPoint { x: 2; y: 7.1 }
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XYPoint { x: 3; y: 7.5 }
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XYPoint { x: 4; y: 6.1 }
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XYPoint { x: 5; y: 3.2 }
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}
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//! [lineseries2]
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}
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}
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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import QtQuick
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import QtGraphs
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Item {
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id: graphContainer
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width: 1280
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height: 720
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Bars3D {
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anchors.fill: parent
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msaaSamples: 8
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cameraPreset: Graphs3D.CameraPreset.IsometricLeftHigh
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theme: GraphsTheme {
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backgroundColor: "white"
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plotAreaBackgroundVisible: false
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grid.mainColor: "black"
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labelFont.pointSize: 20
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labelBackgroundVisible: false
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}
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Bar3DSeries {
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id: series
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itemLabelFormat: "Expenses, @colLabel, @rowLabel: -@valueLabel"
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baseGradient: gradient
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colorStyle: GraphsTheme.ColorStyle.RangeGradient
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ItemModelBarDataProxy {
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id: barProxy
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itemModel: ListModel {
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ListElement{ coords: "0,0"; data: "20.0/10.0/4.75"; }
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ListElement{ coords: "1,0"; data: "21.1/10.3/3.00"; }
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ListElement{ coords: "0,1"; data: "20.2/11.2/3.55"; }
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ListElement{ coords: "1,1"; data: "21.3/11.5/3.03"; }
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ListElement{ coords: "0,2"; data: "20.2/12.3/3.37"; }
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ListElement{ coords: "1,2"; data: "21.1/12.4/2.98"; }
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ListElement{ coords: "0,3"; data: "20.7/13.3/5.34"; }
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ListElement{ coords: "1,3"; data: "21.5/13.2/4.54"; }
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ListElement{ coords: "0,4"; data: "20.6/15.0/6.01"; }
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ListElement{ coords: "1,4"; data: "21.3/14.6/5.83"; }
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}
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rowRole: "coords"
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columnRole: "coords"
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valueRole: "data"
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rowRolePattern: /(\d),\d/
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columnRolePattern: /(\d),(\d)/
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valueRolePattern: /^([^\/]*)\/([^\/]*)\/(.*)$/
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rowRoleReplace: "\\1"
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columnRoleReplace: "\\2"
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valueRoleReplace: "\\3"
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}
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Gradient {
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id: gradient
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GradientStop { position: 1.0; color: "#5000FF" }
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GradientStop { position: 0.0; color: "#2000FF" }
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}
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}
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}
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}
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// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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import QtQuick
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import QtQuick.Layouts
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import QtQuick.Controls.Fusion
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import QtQuick.Dialogs
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Item {
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id: mainView
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width: 1280
|
||||
height: 720
|
||||
|
||||
//! [0]
|
||||
TabBar {
|
||||
id: tabBar
|
||||
anchors.top: parent.top
|
||||
anchors.left: parent.left
|
||||
anchors.right: parent.right
|
||||
|
||||
TabButton {
|
||||
text: "2D Graph"
|
||||
implicitHeight: 50
|
||||
}
|
||||
|
||||
TabButton {
|
||||
text: "3D Graph"
|
||||
implicitHeight: 50
|
||||
}
|
||||
}
|
||||
|
||||
StackLayout {
|
||||
id: stackLayout
|
||||
anchors.top: tabBar.bottom
|
||||
anchors.bottom: parent.bottom
|
||||
width: parent.width
|
||||
currentIndex: tabBar.currentIndex
|
||||
|
||||
Graph2D {}
|
||||
|
||||
Graph3D {}
|
||||
}
|
||||
//! [0]
|
||||
|
||||
RowLayout {
|
||||
id: rowLayout
|
||||
anchors.bottom: parent.bottom
|
||||
anchors.left: parent.left
|
||||
|
||||
//! [1.2]
|
||||
Button {
|
||||
id: setFolderButton
|
||||
onClicked: dialog.open()
|
||||
text: "Set save location"
|
||||
Layout.margins: 5
|
||||
}
|
||||
//! [1.2]
|
||||
//! [3.1]
|
||||
Button {
|
||||
id: captureButton
|
||||
text: "Save to PDF"
|
||||
Layout.margins: 5
|
||||
property var item: stackLayout.itemAt(stackLayout.currentIndex)
|
||||
|
||||
onPressed: {
|
||||
if (stackLayout.currentIndex === 1) {
|
||||
item.width = 7282
|
||||
item.height = 4096
|
||||
}
|
||||
item.grabToImage(function(result) {
|
||||
graphPrinter.generatePDF(dialog.currentFolder, result.image)
|
||||
}, Qt.size(7282, 4096))
|
||||
}
|
||||
|
||||
onReleased: {
|
||||
if (stackLayout.currentIndex === 1) {
|
||||
item.width = mainView.width
|
||||
item.height = mainView.height
|
||||
}
|
||||
}
|
||||
}
|
||||
//! [3.1]
|
||||
|
||||
Button {
|
||||
id: printButton
|
||||
text: "Send to printer"
|
||||
Layout.margins: 5
|
||||
onPressed: printerDialog.open()
|
||||
}
|
||||
}
|
||||
|
||||
//! [1.1]
|
||||
FolderDialog {
|
||||
id: dialog
|
||||
onAccepted: console.log("Saving to " + currentFolder)
|
||||
}
|
||||
//! [1.1]
|
||||
|
||||
//! [2.1]
|
||||
Dialog {
|
||||
id: printerDialog
|
||||
x: parent.width * 0.5 - width * 0.5
|
||||
y: parent.height * 0.5;
|
||||
contentHeight: 200
|
||||
contentWidth: 200
|
||||
|
||||
title: qsTr("Available printers")
|
||||
modal: true
|
||||
|
||||
property var item: stackLayout.itemAt(stackLayout.currentIndex)
|
||||
|
||||
onOpened: {
|
||||
printerModel.clear()
|
||||
var printers = graphPrinter.getPrinters()
|
||||
printers.forEach((x,i) =>
|
||||
printerModel.append({"name": x}))
|
||||
}
|
||||
//! [2.1]
|
||||
|
||||
//! [3.2]
|
||||
onAccepted: {
|
||||
var selectedPrinter = printerModel.get(printerListView.currentIndex)
|
||||
if (stackLayout.currentIndex === 1) {
|
||||
item.width = 7282
|
||||
item.height = 4096
|
||||
}
|
||||
item.grabToImage(function(result) {
|
||||
graphPrinter.print(result.image, selectedPrinter.name)
|
||||
}, Qt.size(7282, 4096))
|
||||
}
|
||||
onClosed: {
|
||||
if (stackLayout.currentIndex === 1) {
|
||||
item.width = mainView.width
|
||||
item.height = mainView.height
|
||||
}
|
||||
}
|
||||
//! [3.2]
|
||||
|
||||
Component {
|
||||
id : printerDelegate
|
||||
Rectangle {
|
||||
width: 200; height: 40
|
||||
color: "transparent"
|
||||
border.color: "black"
|
||||
Text {
|
||||
padding: 5
|
||||
text: qsTr("<b>%1</b>").arg(name)
|
||||
color: "white"
|
||||
}
|
||||
|
||||
MouseArea {
|
||||
anchors.fill: parent
|
||||
onClicked: printerListView.currentIndex = index
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
//! [2.2]
|
||||
contentItem: Item {
|
||||
id: printerItem
|
||||
height: 200
|
||||
width: parent.width
|
||||
ListView {
|
||||
id: printerListView
|
||||
height: 200
|
||||
width: 200
|
||||
clip: true
|
||||
|
||||
model: printerModel
|
||||
delegate: printerDelegate
|
||||
highlight: Rectangle {color: "darkgrey"}
|
||||
}
|
||||
}
|
||||
//! [2.2]
|
||||
|
||||
footer: DialogButtonBox {
|
||||
Button {
|
||||
text: "Print"
|
||||
DialogButtonBox.buttonRole: DialogButtonBox.AcceptRole
|
||||
}
|
||||
standardButtons: Dialog.Cancel
|
||||
}
|
||||
}
|
||||
|
||||
ListModel {
|
||||
id: printerModel
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue