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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: For any questions to Digia, please use the contact form at
** http://www.qt.io
**
** This file is part of the examples of the Qt Enterprise Embedded.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
import QtSensors 5.0
Rectangle {
id: area
color: "lightblue"
border.width: 1
border.color: "darkblue"
property real velocityX: 0
property real velocityY: 0
// Calculate effective rotation
function getRotation() {
var rot = rotation
var newParent = parent
while (newParent) {
rot += newParent.rotation
newParent = newParent.parent
}
return rot%360
}
function updatePosition() {
var actualRotation = getRotation();
// Transform accelerometer readings according
// to actual rotation of item
if (actualRotation == 0) {
velocityX -= accel.reading.x
velocityY += accel.reading.y
} else if (actualRotation == 90 || actualRotation == -270) {
velocityX += accel.reading.y
velocityY += accel.reading.x
} else if (actualRotation == 180 || actualRotation == -180) {
velocityX += accel.reading.x
velocityY -= accel.reading.y
} else if (actualRotation == 270 || actualRotation == -90) {
velocityX -= accel.reading.y
velocityY -= accel.reading.x
} else {
console.debug("The screen rotation of the device has to be a multiple of 90 degrees.")
}
velocityX *= 0.95
velocityY *= 0.95
var newX = bubble.x + velocityX
var newY = bubble.y + velocityY
var right = area.width - bubble.width
var bottom = area.height - bubble.height
if (newX < 0) {
newX = 0
velocityX = -velocityX * 0.9
}
if (newY < 0) {
newY = 0
velocityY = -velocityY * 0.9
}
if (newX > right) {
newX = right
velocityX = -velocityX * 0.9
}
if (newY > bottom) {
newY = bottom
velocityY = -velocityY * 0.9
}
bubble.x = newX
bubble.y = newY
}
Accelerometer {
id: accel
active:true
}
Component.onCompleted: timer.running = true
Timer {
id: timer
interval: 16
running: false
repeat: true
onTriggered: updatePosition()
}
Image {
id: bubble
source: "bluebubble.png"
smooth: true
x: parent.width/2 - bubble.width/2
y: parent.height/2 - bubble.height/2
}
}
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