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

# IconGaugeStyle.qml Example File

dashboard/qml/IconGaugeStyle.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    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
            }
        }
    }