diff options
| author | Rainer Keller <rainer.keller@digia.com> | 2014-07-29 08:54:39 +0200 |
|---|---|---|
| committer | Rainer Keller <rainer.keller@digia.com> | 2014-07-29 14:53:26 +0300 |
| commit | e7564e29be0e69ae4a52351fefd290939810dd2f (patch) | |
| tree | bfd6cdbb2c15ee450f73a4c68aa1630719f87618 | |
| parent | 82e327e5bc8ff3073f8ca8558dce4066a10f6e4a (diff) | |
Handle accelerometer readings in rotated items
If an item is rotated the accelerometer readings have to be
transformed to match the item rotation.
Change-Id: I069dd2d97d1800385ffb08f4fc68c5522ef4b455
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
| -rw-r--r-- | basicsuite/sensors/Accelbubble.qml | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/basicsuite/sensors/Accelbubble.qml b/basicsuite/sensors/Accelbubble.qml index f70aa32..fa42770 100644 --- a/basicsuite/sensors/Accelbubble.qml +++ b/basicsuite/sensors/Accelbubble.qml @@ -49,9 +49,38 @@ Rectangle { 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() { - velocityX += accel.reading.y - velocityY += accel.reading.x + 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 |