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  2. Qt 6.8.5
  3. Qt Graphs
  4. QML 类型
  5. QtGraphs
  6. Scatter3D

Scatter3D QML Type

3D scatter graph. 更多...

import 语句： import QtGraphs
继承：

GraphsItem3D

特性

信号

方法

详细描述

This type enables developers to render scatter graphs in 3D with Qt Quick.

You will need to import Qt Graphs module to use this type: 

import QtGraphs

After that you can use Scatter3D in your qml files: 

import QtQuick
import QtGraphs
Item {
    width: 640
    height: 480
    Scatter3D {
        width: parent.width
        height: parent.height
        Scatter3DSeries {
            ItemModelScatterDataProxy {
                itemModel: dataModel
                // Mapping model roles to scatter series item coordinates.
                xPosRole: "xPos"
                yPosRole: "yPos"
                zPosRole: "zPos"
            }
        }
    }
    ListModel {
        id: dataModel
        ListElement{ xPos: "2.754"; yPos: "1.455"; zPos: "3.362"; }
        ListElement{ xPos: "3.164"; yPos: "2.022"; zPos: "4.348"; }
        ListElement{ xPos: "4.564"; yPos: "1.865"; zPos: "1.346"; }
        ListElement{ xPos: "1.068"; yPos: "1.224"; zPos: "2.983"; }
        ListElement{ xPos: "2.323"; yPos: "2.502"; zPos: "3.133"; }
    }
}

见 Simple Scatter Graph for more thorough usage example.

另请参阅 Scatter3DSeries , ScatterDataProxy , Bars3D , Surface3D ，和 Qt Graphs C++ Classes for 3D .

特性文档编制

ambientLightStrength : real

The ambient light strength for the whole graph. This value determines how evenly and brightly the colors are shown throughout the graph regardless of the light position. The value must be between 0.0 and 1.0 .

aspectRatio : real

The ratio of the graph scaling between the longest axis on the horizontal plane and the y-axis. Defaults to 2.0 .

注意： Has no effect on Bars3D .

另请参阅 horizontalAspectRatio .

axisX : Value3DAxis

The active x-axis.

If an axis is not given, a temporary default axis with no labels and an automatically adjusting range is created. This temporary axis is destroyed if another axis is explicitly set to the same orientation.

axisY : Value3DAxis

The active y-axis.

If an axis is not given, a temporary default axis with no labels and an automatically adjusting range is created. This temporary axis is destroyed if another axis is explicitly set to the same orientation.

axisZ : Value3DAxis

The active z-axis.

If an axis is not given, a temporary default axis with no labels and an automatically adjusting range is created. This temporary axis is destroyed if another axis is explicitly set to the same orientation.

cameraPreset : Graphs3D . CameraPreset

The currently active camera preset, which is one of Graphs3D.CameraPreset . If no preset is active, the value is Graphs3D.CameraPreset.NoPreset .

cameraTargetPosition : vector3d

The camera target as a vector3d. Defaults to vector3d(0.0, 0.0, 0.0) .

Valid coordinate values are between -1.0...1.0 , where the edge values indicate the edges of the corresponding axis range. Any values outside this range are clamped to the edge.

cameraXRotation : real

The X-rotation angle of the camera around the target point in degrees starting from the current base position.

cameraYRotation : real

The Y-rotation angle of the camera around the target point in degrees starting from the current base position.

cameraZoomLevel : real

The camera zoom level in percentage. The default value of 100.0 意味着摄像头没有设置放大 (或缩小)。值被限制通过 minCameraZoomLevel and maxCameraZoomLevel 特性。

另请参阅 minCameraZoomLevel and maxCameraZoomLevel .

currentFps : int

When FPS measuring is enabled, the results for the last second are stored in this read-only property. It takes at least a second before this value updates after measuring is activated.

另请参阅 measureFps .

customItemList : list < Custom3DItem >

列表 Custom3DItem items added to the graph. The graph takes ownership of the added items.

gridLineType : Graphs3D . GridLineType

Defines whether the grid lines type is Graphs3D.GridLineType.Shader or Graphs3D.GridLineType.Geometry .

此值影响所有栅格线。

另请参阅 Graphs3D.GridLineType .

horizontalAspectRatio : real

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 .

注意： Has no effect on Bars3D , which handles scaling on the horizontal plane via the barThickness and barSpacing properties. Polar graphs also ignore this property.

另请参阅 aspectRatio , polar , Bars3D::barThickness ，和 Bars3D::barSpacing .

labelMargin : real

This property specifies the margin for the placement of the axis labels.

Negative values place the labels inside the plot-area while positive values place them outside the plot-area. Label automatic rotation is disabled when the value is negative. Defaults to 0.1

另请参阅 QAbstract3DAxis::labelAutoAngle .

lightColor : color

The color of the ambient and specular light defined in Scene3D .

lightStrength : real

The specular light strength for the whole graph. The value must be between 0.0 and 10.0 .

This value affects the light specified in Scene3D .

locale : locale

Sets the locale used for formatting various numeric labels. Defaults to the "C" locale.

另请参阅 Value3DAxis::labelFormat .

margin : real

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 been changed from the default values. Defaults to -1.0 .

注意： 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.

注意： 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.

maxCameraZoomLevel : real

Sets the maximum allowed camera zoom level. If the new maximum level is lower than the existing minimum level, the minimum level is adjusted to the new maximum as well. If the current cameraZoomLevel is outside the new bounds, it is adjusted as well. Defaults to 500.0f .

另请参阅 cameraZoomLevel and minCameraZoomLevel .

measureFps : bool

若 true , the rendering is done continuously instead of on demand, and the value of the currentFps property is updated. Defaults to false .

另请参阅 currentFps .

minCameraZoomLevel : real

Sets the minimum allowed camera zoom level. If the new minimum level is higher than the existing maximum level, the maximum level is adjusted to the new minimum as well. If the current cameraZoomLevel is outside the new bounds, it is adjusted as well. The minCameraZoomLevel cannot be set below 1.0 。默认为 10.0 .

另请参阅 cameraZoomLevel and maxCameraZoomLevel .

msaaSamples : int

The number of samples used in multisample antialiasing when renderingMode is Indirect 。当 renderingMode is DirectToBackground , this property value is read-only and returns the number of samples specified by the window surface format. Defaults to 4 .

另请参阅 renderingMode .

optimizationHint : Graphs3D . OptimizationHint

Specifies whether the default or legacy mode is used for rendering optimization.

The default mode uses instanced rendering, and provides the full feature set at the best level of performance on most systems. 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. Legacy mode renders all items in th graph individually, without instancing. It should be used only if default mode does not work, that is the same as if the target system does not support instancing. Defaults to 默认 .

注意： 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.

另请参阅 Abstract3DSeries::mesh and Graphs3D.OptimizationHint .

orthoProjection : bool

若 true , orthographic projection will be used for displaying the graph. Defaults to false .

注意： Shadows will be disabled when set to true .

polar : bool

若 true , the horizontal axes are changed into polar axes. The x-axis becomes the angular axis and the z-axis becomes the radial axis. Polar mode is not available for bar graphs.

默认为 false .

另请参阅 orthoProjection and radialLabelOffset .

queriedGraphPosition : vector3d [read-only]

This read-only property contains the latest graph position values along each axis queried using Scene3D::graphPositionQuery . The values are normalized to range [-1, 1] . If the queried position was outside the graph bounds, the values will not reflect the real position, but will instead be some 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.

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

另请参阅 Scene3D::graphPositionQuery .

radialLabelOffset : real

This property specifies 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. This property is ignored if the polar property value is false 。默认为 1.0 .

另请参阅 polar .

renderingMode : Graphs3D . RenderingMode

How the graph will be rendered. Defaults to Indirect .

注意： 设置 antialiasing property of the graph does not do anything. However, it is set by the graph itself if the current rendering mode uses antialiasing.

另请参阅 msaaSamples and Graphs3D.RenderingMode .

rotationEnabled : bool

Whether this input handler allows graph rotation.

默认为 true .

scene : Scene3D [read-only]

The Scene3D pointer that can be used to manipulate the scene and access the scene elements.

This property is read-only.

selectedElement : Graphs3D . ElementType [read-only]

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 信号发射。

The signal can be used for example for implementing customized input handling, as demonstrated by the Axis Handling 范例。

另请参阅 selectedLabelIndex (), selectedAxis (), selectedCustomItemIndex (), selectedCustomItem (), Bars3D::selectedSeries , Scatter3D::selectedSeries , Scene3D::selectionQueryPosition ，和 Graphs3D.ElementType .

selectedSeries : Scatter3DSeries [read-only]

The selected series or null.

selectionEnabled : bool

Whether this input handler allows selection from the graph.

默认为 true .

selectionMode : Graphs3D . SelectionMode

The active selection mode in the graph. One of the Graphs3D.SelectionFlag 枚举值。

seriesList : list < Scatter3DSeries > [default]

This property holds the series of the graph. By default, this property contains an empty list. To set the series, either use the addSeries () method or define them as children of the graph.

shadowQuality : Graphs3D . ShadowQuality

The quality of shadows. One of the Graphs3D.ShadowQuality 枚举值。

shadowStrength : real

The shadow strength for the whole graph. The higher the number, the darker the shadows will be. The value must be between 0.0 and 100.0 .

This value affects the light specified in Scene3D .

theme : GraphsTheme

The active theme of the graph.

另请参阅 GraphsTheme .

wrapCameraXRotation : bool

The behavior of the minimum and maximum limits in the X-rotation. By default, the X-rotation wraps from minimum value to maximum and from maximum to minimum.

若设为 true , the X-rotation of the camera is wrapped from minimum to maximum and from maximum to minimum. If set to false , the X-rotation of the camera is limited to the sector determined by the minimum and maximum values.

wrapCameraYRotation : bool

The behavior of the minimum and maximum limits in the Y-rotation. By default, the Y-rotation is limited between the minimum and maximum values without any wrapping.

若 true , the Y-rotation of the camera is wrapped from minimum to maximum and from maximum to minimum. If false , the Y-rotation of the camera is limited to the sector determined by the minimum and maximum values.

zoomAtTargetEnabled : bool

Whether zooming should change the camera target so that the zoomed point of the graph stays at the same location after the zoom.

默认为 true .

zoomEnabled : bool

Whether this input handler allows graph zooming.

默认为 true .

信号文档编制

axisXChanged ( ValueAxis3D axis )

此信号发射，当 axisX changes to axis .

注意： 相应处理程序是 onAxisXChanged .

axisYChanged ( ValueAxis3D axis )

此信号发射，当 axisY changes to axis .

注意： 相应处理程序是 onAxisYChanged .

axisZChanged ( ValueAxis3D axis )

此信号发射，当 axisZ changes to axis .

注意： 相应处理程序是 onAxisZChanged .

doubleTapped ( QEventPoint eventPoint , Qt::MouseButton button )

This signal is emitted when the graph item is tapped twice within a short span of time. The eventPoint signal parameter contains information from the release event about the point that was tapped, and button 是 mouse button that was clicked, or NoButton on a touchscreen.

注意： 相应处理程序是 onDoubleTapped .

另请参阅 QEventPoint , Qt::MouseButtons ，和 TapHandler::doubleTapped .

dragged ( QVector2D delta )

This signal is emitted when the translation of the cluster of points on the graph is changed while the pinch gesture is being performed. The delta vector gives the change in translation.

注意： 相应处理程序是 onDragged .

另请参阅 PinchHandler::translationChanged .

longPressed ()

此信号发射，当 parent Item is pressed and held for a time period greater than TapHandler::longPressThreshold .

注意： 相应处理程序是 onLongPressed .

另请参阅 TapHandler::longPressed .

mouseMove ( QPoint mousePos )

This signal is emitted when the graph receives a mouseMove event. mousePos value gives the position of mouse while mouse is moving.

注意： 相应处理程序是 onMouseMove .

另请参阅 QQuickItem::mouseMoveEvent .

pinch ( qreal delta )

This signal is emitted when the scale factor on the graph changes while the pinch gesture is being performed. The delta value gives the multiplicative change in scale.

注意： 相应处理程序是 onPinch .

另请参阅 PinchHandler::scaleChanged .

selectedSeriesChanged ( Scatter3DSeries series )

此信号发射，当 selectedSeries changes to series .

注意： 相应处理程序是 onSelectedSeriesChanged .

tapped ( QEventPoint eventPoint , Qt::MouseButton button )

This signal is emitted when the graph item is tapped once. The eventPoint signal parameter contains information from the release event about the point that was tapped, and button 是 mouse button that was clicked, or NoButton on a touchscreen.

注意： 相应处理程序是 onTapped .

另请参阅 QEventPoint , Qt::MouseButtons ，和 TapHandler::singleTapped .

wheel ( QQuickWheelEvent * event )

This signal is emitted every time the graph receives an event 类型 QWheelEvent : that is, every time the wheel is moved or the scrolling gesture is updated.

注意： 相应处理程序是 onWheel .

另请参阅 WheelEvent and WheelHandler::wheel .

方法文档编制

qsizetype addCustomItem ( Custom3DItem item )

添加 Custom3DItem item to the graph. Graph takes ownership of the added item.

Returns index to the added item if add was successful, -1 if trying to add a null item, and index of the item if trying to add an already added item.

另请参阅 removeCustomItems (), removeCustomItem ()，和 removeCustomItemAt ().

void addSeries ( Scatter3DSeries series )

添加 series to the graph. A graph can contain multiple series, but has only one set of axes. If the newly added series has specified a selected item, it will be highlighted and any existing selection will be cleared. Only one added series can have an active selection.

另请参阅 GraphsItem3D::hasSeries ().

void clearSelection ()

Clears selection from all attached series.

bool hasSeries ( Abstract3DSeries series )

Returns whether the series has already been added to the graph.

void releaseCustomItem ( Custom3DItem item )

Gets ownership of item back and removes the item from the graph.

注意： If the same item is added back to the graph, the texture file needs to be re-set.

另请参阅 Custom3DItem::textureFile .

void removeCustomItem ( Custom3DItem item )

Removes the custom item . Deletes the resources allocated to it.

void removeCustomItemAt ( vector3d position )

Removes all custom items at position . Deletes the resources allocated to them.

void removeCustomItems ()

Removes all custom items. Deletes the resources allocated to them.

void removeSeries ( Scatter3DSeries series )

Remove the series from the graph.

另请参阅 GraphsItem3D::hasSeries ().

Abstract3DAxis selectedAxis ()

Can be used to get the selected axis after receiving selectedElementChanged signal with any label type. Selection is valid until the next selectedElementChanged 信号。

Returns the selected axis, or null.

另请参阅 selectedElement .

Custom3DItem selectedCustomItem ()

Can be used to get the selected custom item after receiving selectedElementChanged signal with ElementType.CustomItem type. Ownership of the item remains with the graph. Selection is valid until the next selectedElementChanged 信号。

Returns the selected custom item, or null.

另请参阅 selectedElement .

qsizetype selectedCustomItemIndex ()

Can be used to query the index of the selected custom item after receiving selectedElementChanged signal with ElementType.CustomItem type. Selection is valid until the next selectedElementChanged 信号。

Returns index of the selected custom item, or -1.

另请参阅 selectedElement .

int selectedLabelIndex ()

Can be used to query the index of the selected label after receiving selectedElementChanged signal with any label type. Selection is valid until the next selectedElementChanged 信号。

Returns index of the selected label, or -1.

另请参阅 selectedElement .

内容

  1. 特性

  2. 信号

  3. 方法

  4. 详细描述