Qt Graphs Migration from Qt DataVisualization
The API and functionality between Qt DataVisualization and Qt Graphs has been kept mostly unchanged. However, there are some differences that need to be taken into consideration when migrating your application from Qt DataVisualization to Qt Graphs:
- QML import statement
- CMake module inclusion
- qmake module inclusion
- Widget application creation
- Requirement to use OpenGL backend
- Removed APIs
- Changed APIs
QML Import Statement
The import statement in Qt DataVisualization:
import QtDataVisualization
has to be changed to:
import QtGraphs
for Qt Graphs.
CMake Module Inclusion
The inclusion in Qt DataVisualization:
find_package(Qt6 REQUIRED COMPONENTS DataVisualization)
target_link_libraries(mytarget PRIVATE Qt6::DataVisualization)
has to be changed to:
find_package(Qt6 REQUIRED COMPONENTS Graphs)
target_link_libraries(mytarget PRIVATE Qt6::Graphs)
for Qt Graphs.
Qmake Module Inclusion
The inclusion in Qt DataVisualization:
QT += datavisualization
has to be changed to:
QT += graphs
for Qt Graphs.
Widget Application Creation
Instead of creating your widget application like this:
QGuiApplication app(argc, argv); Q3DScatter scatter; scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);
you should create it like this:
QApplication app(argc, argv); Q3DScatter scatter; scatter.setMinimumSize(QSize(256, 256)); scatter.setResizeMode(QQuickWidget::SizeRootObjectToView);
Requirement to Use OpenGL Backend
Adding the forced OpenGL backend usage:
qputenv("QSG_RHI_BACKEND", "opengl");
is no longer required. Qt Graphs uses Qt Quick 3D for rendering, and as such supports the rendering backends native to the platform it is being run on.
Removed APIs
- hasContext
- shadowsSupported
Changed APIs
- optimizationHints
- renderingMode
optimizationHints
OptimizationLegacy
is now the mode that was OptimizationDefault
in QtDataVisualization. OptimizationDefault
uses instancing, and should be used for all targets that support it.
renderingMode
RenderDirectToBackground_NoClear
has been removed, as it was already obsolete in QtDataVisualization in Qt 6.
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