Qt Sensors - Maze QML Example

The Maze example demonstrates the TiltSensor QML type.

Maze in QML

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

To import the Qt Sensors QML types into your application, use the following import statement in your .qml file:


 import QtSensors

Then, add the Sensor QML types into your qml file.

In this example we use the TiltSensor:


     TiltSensor {
         id: 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
         angle = Math.atan2(-b, a) * mouse.radians_to_degrees
         if (angle < 0)
             angle = 360 + angle

         img.rotation = angle
         mouse.x = newx;
         mouse.y = newy;

Example project @ code.qt.io

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