QtSensors Qt Sensors - Maze QML Example

To write a QML application that will use the TiltSensor QML sensors type you need to do the following steps:

Import the QtSensors 5.x declarative plugin:

import QtSensors 5.0

Add the Sensor QML types into your qml file.

In this example we use the TiltSensor with values based in degrees and an accuracy of 5 degree:

TiltSensor {
    id: tiltSensor
    active: true
}

Starting the sensor can be done by setting the ‘enabled’ property to true:

onTriggered: {
    if (!tiltSensor.enabled)
        tiltSensor.active = true;

The mouse should move by a factor of the tilt value:

var xstep = 0;
xstep = tiltSensor.reading.yRotation * 0.1 //acceleration
var ystep = 0;
ystep = tiltSensor.reading.xRotation * 0.1 //acceleration

The walk direction of the mouse takes into account some collision detection:

if (xstep < 1 && xstep > 0)
    xstep = 0
else if (xstep > -1 && xstep < 0)
    xstep = 0
if (ystep < 1 && ystep > 0)
    ystep = 0;
else if (ystep > -1 && ystep < 0)
    ystep = 0;
if ((xstep < 0 && mouseCtrl.x > 0
     && Lib.canMove(mouseCtrl.x + xstep,mouseCtrl.y))) {
    xval = mouseCtrl.x + xstep;
} else if (xstep > 0 && mouseCtrl.x < (Lib.cellDimension * (Lib.dimension - 1))
    && Lib.canMove(mouseCtrl.x + xstep,mouseCtrl.y)) {
    xval = mouseCtrl.x + xstep;
} else
    xval = mouseCtrl.x;
if (ystep < 0 && mouseCtrl.y > 0
     && Lib.canMove(mouseCtrl.x, mouseCtrl.y + ystep)) {
    yval = mouseCtrl.y + ystep;
} else if (ystep > 0 && (mouseCtrl.y < (Lib.cellDimension * (Lib.dimension - 1)))
         && Lib.canMove(mouseCtrl.x, mouseCtrl.y + ystep)) {
    yval = mouseCtrl.y + ystep;
} else
    yval = mouseCtrl.y
mouseCtrl.move(xval, yval);

The rotation of the mouse image is determined according to the angle that the mouse is moving.

var a = newy - mouse.y
var b = newx - mouse.x
var c = distance(mouse.x, mouse.y, newx, newy)
var radians_to_degrees = 57.2957795
if (a > 0)
    angle = -Math.acos(a / b) * radians_to_degrees
else
    angle = -Math.asin(b / c) * radians_to_degrees
if (b > 0)
     angle = -Math.acos(a / c) * radians_to_degrees
else
    angle = Math.acos(a / c) * radians_to_degrees
if (angle < 0)
    angle = 360 + angle
img.rotation = angle
mouse.x = newx;
mouse.y = newy;

Files:

  • maze/Congratulation.qml
  • maze/LabyrinthSquare.qml
  • maze/Mouse.qml
  • maze/lib.js
  • maze/maze.qml
  • maze/android/AndroidManifest.xml
  • maze/components/ApplicationWindow.qml
  • maze/components/Button.qml
  • maze/main.cpp
  • maze/maze.pro
  • maze/maze.qrc