Qt 5.11 | Qt Sensors | Qt Sensors - Accel Bubble | accelbubble.qml Example File

Qt 5.11.3 Reference Documentation

# accelbubble.qml Example File

accelbubble/accelbubble.qml

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      import QtQuick 2.1
      import QtQuick.Controls 1.0

      import QtSensors 5.0

      ApplicationWindow {
          title: "Accelerate Bubble"
          id: mainWindow
          width: 320
          height: 480
          visible: true
          readonly property double radians_to_degrees: 180 / Math.PI

          Accelerometer {
              id: accel
              dataRate: 100
              active:true

              onReadingChanged: {
                  var newX = (bubble.x + calcRoll(accel.reading.x, accel.reading.y, accel.reading.z) * .1)
                  var newY = (bubble.y - calcPitch(accel.reading.x, accel.reading.y, accel.reading.z) * .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.atan2(y, Math.sqrt(x * x + z * z)) * mainWindow.radians_to_degrees;
          }
          function calcRoll(x,y,z) {
              return -Math.atan2(x, Math.sqrt(y * y + z * z)) * mainWindow.radians_to_degrees;
          }

          Image {
              id: bubble
              source: "content/Bluebubble.svg"
              smooth: true
              property real centerX: mainWindow.width / 2
              property real centerY: mainWindow.height / 2
              property real bubbleCenter: bubble.width / 2
              x: centerX - bubbleCenter
              y: centerY - bubbleCenter

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