main.qml Example File | Qt Creator Manual

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

Qt Creator Manual 4.5.1

# main.qml Example File

accelbubble/main.qml

      /****************************************************************************
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      import QtQuick 2.9
      import QtQuick.Controls 2.2
      import QtSensors 5.9

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

          SwipeView {
              id: swipeView
              anchors.fill: parent
              currentIndex: tabBar.currentIndex

              Page1Form {
                  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
                          }
                      }
                  }
              }

              Page2Form {
              }
          }

          footer: TabBar {
              id: tabBar
              currentIndex: swipeView.currentIndex

              TabButton {
                  text: qsTr("Page 1")
              }
              TabButton {
                  text: qsTr("Page 2")
              }
          }

          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);
          }
      }