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** Copyright (C) 2017 The Qt Company Ltd.
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** This file is part of the examples of Qt for Device Creation.
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import QtQuick 2.0

Item {
    id: gauge

    property real min: 0
    property real max: 360
    property real value: 20
    property real stepCount: 18

    property real increment: (max - min) / stepCount
    property real prevValue: min

    property int currentColorSection
    property int nextColorSection
    property var colorSections: ["ObjectTemperature/objTemp_display_obj_blue.png",
                                 "ObjectTemperature/objTemp_display_obj_green.png",
                                 "ObjectTemperature/objTemp_display_obj_orange.png",
                                 "ObjectTemperature/objTemp_display_obj_red.png"]

    onValueChanged: {
        currentColorSection = Math.floor((prevValue - min) / (max - min) * 3);
        if (currentColorSection < 0)
            currentColorSection = 0;

        if (value > prevValue) {
            prevValue = value;
            rotateAnimation.from = 0;
            rotateAnimation.to = 360;
            rotateAnimation.start();
        }
        else {
            prevValue = value;
            rotateAnimation.from = 360;
            rotateAnimation.to = 0;
            rotateAnimation.start();
        }

        nextColorSection = Math.floor((value - min) / (max - min) * 3);
        if (nextColorSection < 0)
            nextColorSection = 0;

    }

    width: bg.width
    height: bg.height

    Image {
        id: bg

        source: pathPrefix + "ObjectTemperature/objTemp_outer_inner_ring.png"
    }

    Image {
        id: fg

        anchors.centerIn: bg
        source: pathPrefix + colorSections[currentColorSection]
    }

    Image {
        id: fgNext

        anchors.centerIn: bg
        source: pathPrefix + colorSections[nextColorSection]
        rotation: fg.rotation
        onSourceChanged: visible = true
        opacity: fg.rotation / 360
    }

    SequentialAnimation {
        id: rotateAnimation

        property alias from: rot.from
        property alias to: rot.to

        PropertyAnimation {
            id: rot

            target: fg
            property: "rotation"
            duration: 500
        }

        ScriptAction {
            script: {
                fg.source = fgNext.source
                fgNext.visible = false;
            }
        }
    }
}