QAbstract3DGraph Class

Q3DBars *graphWindow = new Q3DBars;
graphWindow->setFlags(graphWindow->flags() ^ Qt::FramelessWindowHint);

Property Documentation

activeInputHandler : QAbstract3DInputHandler*

This property holds the active input handler used in the graph.

Access functions:

Notifier signal:

activeTheme : Q3DTheme*

This property holds the active theme of the graph.

Access functions:

Notifier signal:

aspectRatio : qreal

This property holds the ratio of the graph scaling between the longest axis on the horizontal plane and the y-axis.

Defaults to 2.0.

Note: Has no effect on Q3DBars.

This property was introduced in QtDataVisualization 1.1.

Access functions:

Notifier signal:

See also horizontalAspectRatio.

currentFps : const qreal

This property holds the rendering results for the last second.

The results are stored in this read-only property when FPS measuring is enabled. It takes at least a second before this value is updated after measuring is activated.

This property was introduced in QtDataVisualization 1.1.

Access functions:

Notifier signal:

See also measureFps.

horizontalAspectRatio : qreal

This property holds the ratio of the graph scaling between the x-axis and z-axis.

The value of 0.0 indicates automatic scaling according to axis ranges. Defaults to 0.0.

Has no effect on Q3DBars, which handles scaling on the horizontal plane via the barThickness and barSpacing properties. Polar graphs also ignore this property.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also aspectRatio, polar, Q3DBars::barThickness, and Q3DBars::barSpacing.

locale : QLocale

This property holds the locale used for formatting various numeric labels.

Defaults to the "C" locale.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also QValue3DAxis::labelFormat.

margin : qreal

This property holds the absolute value used for the space left between the edge of the plottable graph area and the edge of the graph background.

If the margin value is negative, the margins are determined automatically and can vary according to the size of the items in the series and the type of the graph. The value is interpreted as a fraction of the y-axis range if the graph aspect ratios have not beed changed from the default values. Defaults to -1.0.

Note: Setting a smaller margin for a scatter graph than the automatically determined margin can cause the scatter items at the edges of the graph to overlap with the graph background.

Note: On scatter and surface graphs, if the margin is small in comparison to the axis label size, the positions of the edge labels of the axes are adjusted to avoid overlap with the edge labels of the neighboring axes.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

measureFps : bool

This property holds whether rendering is done continuously instead of on demand.

If true, rendering is continuous and the value of the currentFps property is updated. Defaults to false.

This property was introduced in QtDataVisualization 1.1.

Access functions:

Notifier signal:

See also currentFps.

optimizationHints : OptimizationHints

This property holds whether the default or static mode is used for rendering optimization.

The default mode provides the full feature set at a reasonable level of performance. The static mode optimizes graph rendering and is ideal for large non-changing data sets. It is slower with dynamic data changes and item rotations. Selection is not optimized, so using the static mode with massive data sets is not advisable. Static optimization works only on scatter graphs. Defaults to OptimizationDefault.

Note: On some environments, large graphs using static optimization may not render, because all of the items are rendered using a single draw call, and different graphics drivers support different maximum vertice counts per call. This is mostly an issue on 32bit and OpenGL ES2 platforms. To work around this issue, choose an item mesh with a low vertex count or use the point mesh.

Access functions:

Notifier signal:

See also QAbstract3DSeries::mesh.

orthoProjection : bool

This property holds whether orthographic projection is used for displaying the graph.

If true, ortographic projection is used to create 2D graphs by replacing the default input handler with one that does not allow rotating the graph and by setting the camera to view the graph directly from the side or from the top. Also, axis labels typically need to be rotated when viewing the graph from the sides. Defaults to false.

Note: Shadows will be disabled when set to true.

This property was introduced in QtDataVisualization 1.1.

Access functions:

Notifier signal:

See also QAbstract3DAxis::labelAutoRotation and Q3DCamera::cameraPreset.

polar : bool

This property holds whether horizontal axes are changed into polar axes.

If true, the x-axis becomes the angular axis and the z-axis becomes the radial axis. Polar mode is not available for bar graphs.

Defaults to false.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also orthoProjection and radialLabelOffset.

queriedGraphPosition : const QVector3D

This property holds the latest queried graph position values along each axis.

This read-only property contains the results from Q3DScene::graphPositionQuery. The values are normalized to the range [-1, 1]. If the queried position was outside the graph bounds, the values will not reflect the real position, but will instead indicate an undefined position outside the range [-1, 1]. The value will be undefined until a query is made.

There is no single correct 3D coordinate to match a particular screen position, so to be consistent, the queries are always done against the inner sides of an invisible box surrounding the graph.

Note: Bar graphs only allow querying graph position at the graph floor level, so the y-value is always zero for bar graphs and the valid queries can be only made at screen positions that contain the floor of the graph.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also Q3DScene::graphPositionQuery.

radialLabelOffset : float

This property holds the normalized horizontal offset for the axis labels of the radial polar axis.

The value 0.0 indicates that the labels should be drawn next to the 0-angle angular axis grid line. The value 1.0 indicates that the labels are drawn in their usual place at the edge of the graph background. Defaults to 1.0.

This property is ignored if the polar property value is false.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also polar.

reflection : bool

This property holds whether floor reflections are on or off.

Defaults to false.

Affects only Q3DBars. However, in Q3DBars graphs holding both positive and negative values, reflections are not supported for custom items that intersect the floor plane. In that case, reflections should be turned off to avoid incorrect rendering.

If using a custom surface format, the stencil buffer needs to be defined (QSurfaceFormat::setStencilBufferSize()) for reflections to work.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also reflectivity.

reflectivity : qreal

Floor reflectivity.

Larger numbers make the floor more reflective. The valid range is [0...1]. Defaults to 0.5.

Note: Affects only Q3DBars.

This property was introduced in QtDataVisualization 1.2.

Access functions:

Notifier signal:

See also reflection.

scene : Q3DScene* const

This property holds the Q3DScene pointer that can be used to manipulate the scene and access the scene elements, such as the active camera.

This property is read-only.

Access functions:

selectedElement : const ElementType

This property holds the element selected in the graph.

This property can be used to query the selected element type. The type is valid until a new selection is made in the graph and the selectedElementChanged signal is emitted.

The signal can be used for example for implementing custom input handlers, as demonstrated by the Axis Range Dragging With Labels Example.

This property was introduced in QtDataVisualization 1.1.

Access functions:

Notifier signal:

See also selectedLabelIndex(), selectedAxis(), selectedCustomItemIndex(), selectedCustomItem(), Q3DBars::selectedSeries(), Q3DScatter::selectedSeries(), Q3DSurface::selectedSeries(), and Q3DScene::setSelectionQueryPosition().

selectionMode : SelectionFlags

Item selection mode.

A combination of SelectionFlags. By default, SelectionItem. Different graph types support different selection modes.

Access functions:

Notifier signal:

See also SelectionFlags.

shadowQuality : ShadowQuality

This property holds the quality of the shadow.

One of the ShadowQuality enum values. By default, ShadowQualityMedium.

Note: If setting the shadow quality to a certain level fails, the level is lowered until it is successfully set. The shadowQualityChanged signal is emitted each time a change is made.

Access functions:

Notifier signal:

See also ShadowQuality.

#include <QtDataVisualization/qutils.h>

// ...

Q3DBars *graph = new Q3DBars(QtDataVisualization::qDefaultSurfaceFormat(false));

#include <QtDataVisualization/qutils.h>

// ...

QQuickView viewer;
viewer.setFormat(QtDataVisualization::qDefaultSurfaceFormat());