Measure.qml Example File

heartrate-game/qml/Measure.qml 
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 import QtQuick 2.5

 GamePage {
     id: measurePage

     errorMessage: deviceHandler.error
     infoMessage: deviceHandler.info

     property real __timeCounter: 0;
     property real __maxTimeCount: 60
     property string relaxText: qsTr("Relax!\nWhen you are ready, press Start. You have %1s time to increase heartrate so much as possible.\nGood luck!").arg(__maxTimeCount)

     function close()
     {
         deviceHandler.stopMeasurement();
         deviceHandler.disconnectService();
         app.prevPage();
     }

     function start()
     {
         if (!deviceHandler.measuring) {
             __timeCounter = 0;
             deviceHandler.startMeasurement()
         }
     }

     function stop()
     {
         if (deviceHandler.measuring) {
             deviceHandler.stopMeasurement()
         }

         app.showPage("Stats.qml")
     }

     Timer {
         id: measureTimer
         interval: 1000
         running: deviceHandler.measuring
         repeat: true
         onTriggered: {
             __timeCounter++;
             if (__timeCounter >= __maxTimeCount)
                 measurePage.stop()
         }
     }

     Column {
         anchors.centerIn: parent
         spacing: GameSettings.fieldHeight * 0.5

         Rectangle {
             id: circle
             anchors.horizontalCenter: parent.horizontalCenter
             width: Math.min(measurePage.width, measurePage.height-GameSettings.fieldHeight*4) - 2*GameSettings.fieldMargin
             height: width
             radius: width*0.5
             color: GameSettings.viewColor

             Text {
                 id: hintText
                 anchors.centerIn: parent
                 anchors.verticalCenterOffset: -parent.height*0.1
                 horizontalAlignment: Text.AlignHCenter
                 verticalAlignment: Text.AlignVCenter
                 width: parent.width * 0.8
                 height: parent.height * 0.6
                 wrapMode: Text.WordWrap
                 text: measurePage.relaxText
                 visible: !deviceHandler.measuring
                 color: GameSettings.textColor
                 fontSizeMode: Text.Fit
                 minimumPixelSize: 10
                 font.pixelSize: GameSettings.mediumFontSize
             }

             Text {
                 id: text
                 anchors.centerIn: parent
                 anchors.verticalCenterOffset: -parent.height*0.15
                 font.pixelSize: parent.width * 0.45
                 text: deviceHandler.hr
                 visible: deviceHandler.measuring
                 color: GameSettings.textColor
             }

             Item {
                 id: minMaxContainer
                 anchors.horizontalCenter: parent.horizontalCenter
                 width: parent.width*0.7
                 height: parent.height * 0.15
                 anchors.bottom: parent.bottom
                 anchors.bottomMargin: parent.height*0.16
                 visible: deviceHandler.measuring

                 Text {
                     anchors.left: parent.left
                     anchors.verticalCenter: parent.verticalCenter
                     text: deviceHandler.minHR
                     color: GameSettings.textColor
                     font.pixelSize: GameSettings.hugeFontSize

                     Text {
                         anchors.left: parent.left
                         anchors.bottom: parent.top
                         font.pixelSize: parent.font.pixelSize*0.8
                         color: parent.color
                         text: "MIN"
                     }
                 }

                 Text {
                     anchors.right: parent.right
                     anchors.verticalCenter: parent.verticalCenter
                     text: deviceHandler.maxHR
                     color: GameSettings.textColor
                     font.pixelSize: GameSettings.hugeFontSize

                     Text {
                         anchors.right: parent.right
                         anchors.bottom: parent.top
                         font.pixelSize: parent.font.pixelSize*0.8
                         color: parent.color
                         text: "MAX"
                     }
                 }
             }

             Image {
                 id: heart
                 anchors.horizontalCenter: minMaxContainer.horizontalCenter
                 anchors.verticalCenter: minMaxContainer.bottom
                 width: parent.width * 0.2
                 height: width
                 source: "images/heart.png"
                 smooth: true
                 antialiasing: true

                 SequentialAnimation{
                     id: heartAnim
                     running: deviceHandler.alive
                     loops: Animation.Infinite
                     alwaysRunToEnd: true
                     PropertyAnimation { target: heart; property: "scale"; to: 1.2; duration: 500; easing.type: Easing.InQuad }
                     PropertyAnimation { target: heart; property: "scale"; to: 1.0; duration: 500; easing.type: Easing.OutQuad }
                 }
             }
         }

         Rectangle {
             id: timeSlider
             color: GameSettings.viewColor
             anchors.horizontalCenter: parent.horizontalCenter
             width: circle.width
             height: GameSettings.fieldHeight
             radius: GameSettings.buttonRadius

             Rectangle {
                 height: parent.height
                 radius: parent.radius
                 color: GameSettings.sliderColor
                 width: Math.min(1.0,__timeCounter / __maxTimeCount) * parent.width
             }

             Text {
                 anchors.centerIn: parent
                 color: "gray"
                 text: (__maxTimeCount - __timeCounter).toFixed(0) + " s"
                 font.pixelSize: GameSettings.bigFontSize
             }
         }
     }

     GameButton {
         id: startButton
         anchors.horizontalCenter: parent.horizontalCenter
         anchors.bottom: parent.bottom
         anchors.bottomMargin: GameSettings.fieldMargin
         width: circle.width
         height: GameSettings.fieldHeight
         enabled: !deviceHandler.measuring
         radius: GameSettings.buttonRadius

         onClicked: start()

         Text {
             anchors.centerIn: parent
             font.pixelSize: GameSettings.tinyFontSize
             text: qsTr("START")
             color: startButton.enabled ? GameSettings.textColor : GameSettings.disabledTextColor
         }
     }
 }

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