Qt Creator Manual | Creating a Mobile Application | main.qml Example File

Qt Creator Manual 4.4.0

# main.qml Example File

accelbubble/main.qml

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      import QtQuick 2.7
      import QtQuick.Controls 2.0
      import QtQuick.Layouts 1.0
      import QtSensors 5.7

      ApplicationWindow {
          visible: true
          width: 640
          height: 480
          title: qsTr("Accelerate Bubble")

          Page1 {
              anchors.fill: parent
              bubble {
                  id: bubble
                  centerX: mainWindow.width / 2
                  centerY: mainWindow.height / 2
                  bubbleCenter: bubble.width / 2
                  x: bubble.centerX - bubble.bubbleCenter
                  y: bubble.centerY - bubble.bubbleCenter

                  Behavior on y {
                      SmoothedAnimation {
                          easing.type: Easing.Linear
                          duration: 100
                      }
                  }
                  Behavior on x {
                      SmoothedAnimation {
                          easing.type: Easing.Linear
                          duration: 100
                      }
                  }
              }
          }

          Accelerometer {
                 id: accel
                 dataRate: 100
                 active: true

                 onReadingChanged: {
                     var newX = (bubble.x + calcRoll(accel.reading.x, accel.reading.y, accel.reading.z) * 0.1)
                     var newY = (bubble.y - calcPitch(accel.reading.x, accel.reading.y, accel.reading.z) * 0.1)

                     if (isNaN(newX) || isNaN(newY))
                         return;

                     if (newX < 0)
                         newX = 0

                     if (newX > mainWindow.width - bubble.width)
                         newX = mainWindow.width - bubble.width

                     if (newY < 18)
                         newY = 18

                     if (newY > mainWindow.height - bubble.height)
                         newY = mainWindow.height - bubble.height

                         bubble.x = newX
                         bubble.y = newY
                 }
             }

             function calcPitch(x, y, z) {
                 return -(Math.atan(y / Math.sqrt(x * x + z * z)) * 57.2957795);
             }
             function calcRoll(x, y, z) {
                 return -(Math.atan(x / Math.sqrt(y * y + z * z)) * 57.2957795);
             }
      }