IconGaugeStyle.qml Example File

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 import QtQuick 2.2
 import QtQuick.Controls.Styles 1.4
 import QtQuick.Extras 1.4

 DashboardGaugeStyle {
     id: fuelGaugeStyle
     minimumValueAngle: -60
     maximumValueAngle: 60
     tickmarkStepSize: 1
     labelStepSize: 1
     labelInset: toPixels(-0.25)
     minorTickmarkCount: 3

     needleLength: toPixels(0.85)
     needleBaseWidth: toPixels(0.08)
     needleTipWidth: toPixels(0.03)

     halfGauge: true

     property string icon: ""
     property color minWarningColor: "transparent"
     property color maxWarningColor: "transparent"
     readonly property real minWarningStartAngle: minimumValueAngle - 90
     readonly property real maxWarningStartAngle: maximumValueAngle - 90

     tickmark: Rectangle {
         implicitWidth: toPixels(0.06)
         antialiasing: true
         implicitHeight: toPixels(0.2)
         color: "#c8c8c8"
     }

     minorTickmark: Rectangle {
         implicitWidth: toPixels(0.03)
         antialiasing: true
         implicitHeight: toPixels(0.15)
         color: "#c8c8c8"
     }

     background: Item {
         Canvas {
             anchors.fill: parent
             onPaint: {
                 var ctx = getContext("2d");
                 ctx.reset();

                 paintBackground(ctx);

                 if (minWarningColor != "transparent") {
                     ctx.beginPath();
                     ctx.lineWidth = fuelGaugeStyle.toPixels(0.08);
                     ctx.strokeStyle = minWarningColor;
                     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(minWarningStartAngle),
                         degToRad(minWarningStartAngle + angleRange / (minorTickmarkCount + 1)), false);
                     ctx.stroke();
                 }
                 if (maxWarningColor != "transparent") {
                     ctx.beginPath();
                     ctx.lineWidth = fuelGaugeStyle.toPixels(0.08);
                     ctx.strokeStyle = maxWarningColor;
                     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(maxWarningStartAngle - angleRange / (minorTickmarkCount + 1)),
                         degToRad(maxWarningStartAngle), false);
                     ctx.stroke();
                 }
             }
         }

         Image {
             source: icon
             anchors.bottom: parent.verticalCenter
             anchors.bottomMargin: toPixels(0.3)
             anchors.horizontalCenter: parent.horizontalCenter
             width: toPixels(0.3)
             height: width
             fillMode: Image.PreserveAspectFit
         }
     }
 }