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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module 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 Nokia Corporation and its Subsidiary(-ies) 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 1.0

/* A meter component. */
Rectangle {
    id: meter

    property real value: 0
    property real minValue: -1
    property real maxValue: 1
    property alias imageSize: meterImage.sourceSize

    function valueChanged(pValue) {
        value = pValue;
        scaleValueToAngle();
    }
    function scaleValueToAngle() {
        pointer.angle = (((value-minValue)/(maxValue-minValue))*
                          (pointer.angleMax-pointer.angleMin))+
                           pointer.angleMin;
    }

    color: "transparent"

    Image {
        id: meterImage

        smooth: true
        source: "./images/meterBG.png"
        anchors.fill: parent
    }

    Image {
        id:pointerShadow

        x: pointer.x - 2
        y: pointer.y - 2
        height: pointer.height
        smooth: true
        source: "./images/pointerShadow.png"
        transform: Rotation {
            origin.x: 2
            origin.y: height
            angle: -pointer.angle
        }
    }

    Image {
        id: pointer

        property real angle: 0
        property real angleMax: -45
        property real angleMin: 45

        height: parent.height*0.92
        transformOrigin: "Bottom"
        rotation: -angle
        smooth: true
        source: "./images/pointer.png"
        anchors {
            bottomMargin: 2
            bottom: parent.bottom;
            horizontalCenter: parent.horizontalCenter
        }

        Behavior on angle {
            SpringAnimation {
                spring: 1.4
                damping: 0.15
            }
        }
    }
}