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<td >Qt 5.12</td><td ><a href="qtdatavisualization-index.html">Qt Data Visualization</a></td><td >Qt Quick 2 Multiple Graphs Example</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#multiple-graphs">Multiple Graphs</a></li>
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<h1 class="title">Qt Quick 2 Multiple Graphs Example</h1>
<span class="subtitle"></span>
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<p>Showing multiple graphs simultaneously in a QML application.</p>
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<div class="descr"> <a name="details"></a>
<p>The Qt Quick 2 multiple graphs example demonstrates using multiple graphs in single window.</p>
<p class="centerAlign"><img src="images/qmlmultigraph-example.png" alt="" /></p><p>The interesting thing about this example is demonstrating that multiple graphs can be used simultaneously, so most functionality is not explained in detail. For more detailed QML example documentation, see <a href="qtdatavisualization-qmlscatter-example.html">Qt Quick 2 Scatter Example</a>.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="multiple-graphs"></a>
<h2 id="multiple-graphs">Multiple Graphs</h2>
<p>Using multiple graphs in a single application doesn't require anything special, simply define and position the graphs as normal. In this example the graphs are shown in a 2 x 2 grid with <code>GridLayout</code>:</p>
<pre class="qml">
GridLayout {
id: gridLayout
columns: 2
Layout.fillHeight: true
Layout.fillWidth: true
anchors.top: mainView.top
anchors.bottom: mainView.bottom
anchors.left: mainView.left
anchors.right: mainView.right
Rectangle {
Layout.fillHeight: true
Layout.fillWidth: true
border.color: surfaceGraph.theme.gridLineColor
border.width: 2
Surface3D {
id: surfaceGraph
anchors.fill: parent
anchors.margins: parent.border.width
theme: Theme3D {
type: Theme3D.ThemePrimaryColors
font.pointSize: 60
}
scene.activeCamera.cameraPreset: Camera3D.CameraPresetIsometricLeftHigh
Surface3DSeries {
itemLabelFormat: "Pop density at (@xLabel N, @zLabel E): @yLabel"
ItemModelSurfaceDataProxy {
itemModel: data.sharedData
// The surface data points are not neatly lined up in rows and columns,
// so we define explicit row and column roles.
rowRole: "row"
columnRole: "col"
xPosRole: "latitude"
zPosRole: "longitude"
yPosRole: "pop_density"
}
}
}
}
// We'll use one grid cell for buttons
Rectangle {
Layout.fillHeight: true
Layout.fillWidth: true
GridLayout {
anchors.right: parent.right
anchors.left: parent.left
anchors.top: parent.top
anchors.bottom: parent.bottom
columns: 2
NewButton {
Layout.minimumWidth: parent.width / 2
Layout.fillHeight: true
Layout.fillWidth: true
text: "Clear Selections"
onClicked: clearSelections() // call a helper function to keep button itself simpler
}
NewButton {
Layout.minimumWidth: parent.width / 2
Layout.fillHeight: true
Layout.fillWidth: true
text: "Quit"
onClicked: Qt.quit(0);
}
NewButton {
Layout.fillHeight: true
Layout.fillWidth: true
text: "Reset Cameras"
onClicked: resetCameras() // call a helper function to keep button itself simpler
}
NewButton {
Layout.fillHeight: true
Layout.fillWidth: true
text: "Toggle Mesh Styles"
onClicked: toggleMeshStyle() // call a helper function to keep button itself simpler
}
}
}
Rectangle {
Layout.fillHeight: true
Layout.fillWidth: true
border.color: scatterGraph.theme.gridLineColor
border.width: 2
Scatter3D {
id: scatterGraph
anchors.fill: parent
anchors.margins: parent.border.width
theme: Theme3D {
type: Theme3D.ThemeDigia
font.pointSize: 60
}
scene.activeCamera.cameraPreset: Camera3D.CameraPresetIsometricLeftHigh
Scatter3DSeries {
itemLabelFormat: "Pop density at (@xLabel N, @zLabel E): @yLabel"
ItemModelScatterDataProxy {
itemModel: data.sharedData
// Mapping model roles to scatter series item coordinates.
xPosRole: "latitude"
zPosRole: "longitude"
yPosRole: "pop_density"
}
}
}
}
Rectangle {
Layout.fillHeight: true
Layout.fillWidth: true
border.color: barGraph.theme.gridLineColor
border.width: 2
Bars3D {
id: barGraph
anchors.fill: parent
anchors.margins: parent.border.width
theme: Theme3D {
type: Theme3D.ThemeQt
font.pointSize: 60
}
selectionMode: AbstractGraph3D.SelectionItemAndRow | AbstractGraph3D.SelectionSlice
scene.activeCamera.cameraPreset: Camera3D.CameraPresetIsometricLeftHigh
Bar3DSeries {
itemLabelFormat: "@seriesName: @valueLabel"
name: "Population density"
ItemModelBarDataProxy {
itemModel: data.sharedData
// Mapping model roles to bar series rows, columns, and values.
rowRole: "row"
columnRole: "col"
valueRole: "pop_density"
}
}
}
}
}
</pre>
<p>Each graph has a parent <code>Rectangle</code> item to provide it with a border.</p>
<p>Note that one of the grid cells is used for buttons in an another <code>GridLayout</code>.</p>
<p>Files:</p>
<ul>
<li><a href="qtdatavisualization-qmlmultigraph-main-cpp.html">qmlmultigraph/main.cpp</a></li>
<li><a href="qtdatavisualization-qmlmultigraph-qml-qmlmultigraph-data-qml.html">qmlmultigraph/qml/qmlmultigraph/Data.qml</a></li>
<li><a href="qtdatavisualization-qmlmultigraph-qml-qmlmultigraph-newbutton-qml.html">qmlmultigraph/qml/qmlmultigraph/NewButton.qml</a></li>
<li><a href="qtdatavisualization-qmlmultigraph-qml-qmlmultigraph-main-qml.html">qmlmultigraph/qml/qmlmultigraph/main.qml</a></li>
<li><a href="qtdatavisualization-qmlmultigraph-qmlmultigraph-pro.html">qmlmultigraph/qmlmultigraph.pro</a></li>
<li><a href="qtdatavisualization-qmlmultigraph-qmlmultigraph-qrc.html">qmlmultigraph/qmlmultigraph.qrc</a></li>
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