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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
            }
        }
    }
}