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Qt Quick 2 Multiple Graphs Example

Showing multiple graphs simultaneously in a QML application.

The Qt Quick 2 multiple graphs example demonstrates using multiple graphs in single window.

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 Qt Quick 2 Scatter Example.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Multiple Graphs

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 GridLayout:

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"
                }
            }
        }
    }
}

Each graph has a parent Rectangle item to provide it with a border.

Note that one of the grid cells is used for buttons in an another GridLayout.

Files:

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