qt-everywhere-src-5.14.1/qtquickcontrols/examples/quickcontrols/extras/dashboard/qml/TachometerStyle.qml

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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
        }
    }
}