f8173411cc
commit db1a75ffc2d5a811a8d983289dd4d0d9f2eeba5c Author: Yang Li <liyang@google.com> Date: Fri May 1 17:49:29 2009 -0700 Fixed a few more styles issues and made some methods package private commit f9735c3f1bbe6183337df226aa730b4be1225d55 Author: Yang Li <liyang@google.com> Date: Fri May 1 16:38:16 2009 -0700 - Refactored the code for Android coding styles and performance - Renamed GesturePad to GestureOverlay - Added GestureAdapter for default touch-through interactions of GestureOverlay - Added a new exmaple, ContactListGestureOverlay, to show how to gesture over an arbitary view commit 31050183c6d85091612f53155126c2488b920e32 Author: Yang Li <liyang@google.com> Date: Wed Apr 29 18:41:54 2009 -0700 Refactored the Gesture Library (An initial check-in).
107 lines
3.4 KiB
Java
Executable File
107 lines
3.4 KiB
Java
Executable File
/*
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* Copyright (C) 2008-2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.gesture;
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/**
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* An instance represents a sample if the label is available or a query if the
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* label is null.
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*/
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public class Instance {
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private static final int SEQUENCE_SAMPLE_SIZE = 16;
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private static final int PATCH_SAMPLE_SIZE = 8;
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private final static float[] ORIENTATIONS = {
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0, 45, 90, 135, 180, -0, -45, -90, -135, -180
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};
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// the feature vector
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public final float[] vector;
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// the label can be null
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public final String label;
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// the length of the vector
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public final float magnitude;
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// the id of the instance
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public final long instanceID;
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private Instance(long id, float[] sample, String sampleName) {
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instanceID = id;
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vector = sample;
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label = sampleName;
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float sum = 0;
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int size = sample.length;
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for (int i = 0; i < size; i++) {
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sum += sample[i] * sample[i];
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}
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magnitude = (float) Math.sqrt(sum);
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}
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/**
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* create a learning instance for a single stroke gesture
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*
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* @param gesture
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* @param label
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* @return the instance
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*/
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public static Instance createInstance(GestureLibrary gesturelib, Gesture gesture, String label) {
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float[] pts;
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if (gesturelib.getGestureType() == GestureLibrary.SEQUENCE_SENSITIVE) {
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pts = sequenceSampler(gesturelib, gesture);
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} else {
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pts = spatialSampler(gesture);
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}
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return new Instance(gesture.getID(), pts, label);
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}
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private static float[] spatialSampler(Gesture gesture) {
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float[] pts = GestureUtils.spatialFeaturize(gesture, PATCH_SAMPLE_SIZE);
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return pts;
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}
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private static float[] sequenceSampler(GestureLibrary gesturelib, Gesture gesture) {
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float[] pts = GestureUtils.sequentialFeaturize(gesture.getStrokes().get(0),
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SEQUENCE_SAMPLE_SIZE);
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float[] center = GestureUtils.computeCentroid(pts);
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float orientation = (float) Math.atan2(pts[1] - center[1], pts[0] - center[0]);
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orientation *= 180 / Math.PI;
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float adjustment = -orientation;
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if (gesturelib.getOrientationStyle() == GestureLibrary.ORIENTATION_SENSITIVE) {
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int count = ORIENTATIONS.length;
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for (int i = 0; i < count; i++) {
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float delta = ORIENTATIONS[i] - orientation;
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if (Math.abs(delta) < Math.abs(adjustment)) {
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adjustment = delta;
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}
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}
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}
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android.graphics.Matrix m = new android.graphics.Matrix();
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m.setTranslate(-center[0], -center[1]);
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android.graphics.Matrix rotation = new android.graphics.Matrix();
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rotation.setRotate(adjustment);
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m.postConcat(rotation);
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m.mapPoints(pts);
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return pts;
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}
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}
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