1/*
2 * Copyright (C) 2008-2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.gesture;
18
19import android.graphics.Matrix;
20import android.graphics.Path;
21
22/**
23 * An oriented bounding box
24 */
25public class OrientedBoundingBox {
26    public final float squareness;
27
28    public final float width;
29    public final float height;
30
31    public final float orientation;
32
33    public final float centerX;
34    public final float centerY;
35
36    OrientedBoundingBox(float angle, float cx, float cy, float w, float h) {
37        orientation = angle;
38        width = w;
39        height = h;
40        centerX = cx;
41        centerY = cy;
42        float ratio = w / h;
43        if (ratio > 1) {
44            squareness = 1 / ratio;
45        } else {
46            squareness = ratio;
47        }
48    }
49
50    /**
51     * Currently used for debugging purpose only.
52     *
53     * @hide
54     */
55    public Path toPath() {
56        Path path = new Path();
57        float[] point = new float[2];
58        point[0] = -width / 2;
59        point[1] = height / 2;
60        Matrix matrix = new Matrix();
61        matrix.setRotate(orientation);
62        matrix.postTranslate(centerX, centerY);
63        matrix.mapPoints(point);
64        path.moveTo(point[0], point[1]);
65
66        point[0] = -width / 2;
67        point[1] = -height / 2;
68        matrix.mapPoints(point);
69        path.lineTo(point[0], point[1]);
70
71        point[0] = width / 2;
72        point[1] = -height / 2;
73        matrix.mapPoints(point);
74        path.lineTo(point[0], point[1]);
75
76        point[0] = width / 2;
77        point[1] = height / 2;
78        matrix.mapPoints(point);
79        path.lineTo(point[0], point[1]);
80
81        path.close();
82
83        return path;
84    }
85}
86