I've been trying to figure out how to use a GestureOverlayView with my
application, and wanted to see if SEQUENCE_INVARIANT would make a
difference. That is, I do this:
gestureLib.setSequenceType(GestureStore.SEQUENCE_INVARIANT);
before trying to use gestureLib.recognize(). The short answer is that
it makes a difference, but the bad part is I haven't had one gesture
match to anything in my GestureLibrary when this option is set this
way, no matter how carefully I draw the input gesture. From the source
code of InstanceLearner.java it appears that the distance value
between vectors is calculated using Squared Euclidean instead of
Cosine when you use SEQUENCE_INVARIANT. Digging deeper than that
starts to hurt my brain so I thought I would post here to find out if
anyone has tried this, or know what SEQUENCE_INVARIANT is supposed to
do. I've tried this in the emulator on an Eclair 2.0 AVD and also on a
Motorola Droid. Here's relevant code from my Activity:
public class MainActivity extends Activity implements
OnGesturePerformedListener {
private static final String TAG = "Gesture Revealer";
GestureLibrary gestureLib = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gestureLib = GestureLibraries.fromFile("/sdcard/gestures");
if (!gestureLib.load()) {
Toast.makeText(this, "Could not load /sdcard/gestures",
Toast.LENGTH_SHORT).show();
finish();
}
// Here's where we can change the default values
//gestureLib.setOrientationStyle
(GestureStore.ORIENTATION_INVARIANT);
gestureLib.setSequenceType(GestureStore.SEQUENCE_INVARIANT);
GestureOverlayView gestureView = (GestureOverlayView)
findViewById(R.id.gestureOverlay);
gestureView.addOnGesturePerformedListener(this);
}
@Override
public void onGesturePerformed(GestureOverlayView view, Gesture
gesture) {
ArrayList<Prediction> predictions = gestureLib.recognize
(gesture);
if (predictions.size() > 0) {
Prediction prediction = (Prediction) predictions.get(0);
if (prediction.score > 1.0) {
Toast.makeText(this, prediction.name,
Toast.LENGTH_SHORT).show();
}
}
}
}
- dave
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