- Qt 5.5
- Qt Quick Extras
- Qt Quick Extras - Dashboard
- TachometerStyle.qml Example File
- Qt 5.5.1 Reference Documentation

# TachometerStyle.qml Example File

dashboard/qml/TachometerStyle.qml

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
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    ** This file is part of the examples of the Qt Toolkit.
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    import QtQuick 2.2
    import QtQuick.Controls.Styles 1.4
    import QtQuick.Extras 1.4

    DashboardGaugeStyle {
        id: tachometerStyle
        tickmarkStepSize: 1
        labelStepSize: 1
        needleLength: toPixels(0.85)
        needleBaseWidth: toPixels(0.08)
        needleTipWidth: toPixels(0.03)

        tickmark: Rectangle {
            implicitWidth: toPixels(0.03)
            antialiasing: true
            implicitHeight: toPixels(0.08)
            color: styleData.index === 7 || styleData.index === 8 ? Qt.rgba(0.5, 0, 0, 1) : "#c8c8c8"
        }

        minorTickmark: null

        tickmarkLabel: Text {
            font.pixelSize: Math.max(6, toPixels(0.12))
            text: styleData.value
            color: styleData.index === 7 || styleData.index === 8 ? Qt.rgba(0.5, 0, 0, 1) : "#c8c8c8"
            antialiasing: true
        }

        background: Canvas {
            onPaint: {
                var ctx = getContext("2d");
                ctx.reset();
                paintBackground(ctx);

                ctx.beginPath();
                ctx.lineWidth = tachometerStyle.toPixels(0.08);
                ctx.strokeStyle = Qt.rgba(0.5, 0, 0, 1);
                var warningCircumference = maximumValueAngle - minimumValueAngle * 0.1;
                var startAngle = maximumValueAngle - 90;
                ctx.arc(outerRadius, outerRadius,
                    // Start the line in from the decorations, and account for the width of the line itself.
                    outerRadius - tickmarkInset - ctx.lineWidth / 2,
                    degToRad(startAngle - angleRange / 8 + angleRange * 0.015),
                    degToRad(startAngle - angleRange * 0.015), false);
                ctx.stroke();
            }

            Text {
                id: rpmText
                font.pixelSize: tachometerStyle.toPixels(0.3)
                text: rpmInt
                color: "white"
                horizontalAlignment: Text.AlignRight
                anchors.horizontalCenter: parent.horizontalCenter
                anchors.top: parent.verticalCenter
                anchors.topMargin: 20

                readonly property int rpmInt: valueSource.rpm
            }
            Text {
                text: "x1000"
                color: "white"
                font.pixelSize: tachometerStyle.toPixels(0.1)
                anchors.top: parent.top
                anchors.topMargin: parent.height / 4
                anchors.horizontalCenter: parent.horizontalCenter
            }
            Text {
                text: "RPM"
                color: "white"
                font.pixelSize: tachometerStyle.toPixels(0.1)
                anchors.top: rpmText.bottom
                anchors.horizontalCenter: parent.horizontalCenter
            }
        }
    }