GestureStrokeDrawingParams.java revision e2a6253cb581f9ab70cfb723d32b14f9ac7d2ab7 
1/*
2 * Copyright (C) 2013 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 com.android.inputmethod.keyboard.internal;
18
19import android.content.res.TypedArray;
20
21import com.android.inputmethod.latin.R;
22
23/**
24 * This class holds parameters to control how a gesture stroke is sampled and drawn on the screen.
25 *
26 * @attr ref R.styleable#MainKeyboardView_gestureTrailMinSamplingDistance
27 * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationAngularThreshold
28 * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationDistanceThreshold
29 * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationSegments
30 */
31public final class GestureStrokeDrawingParams {
32    public final double mMinSamplingDistance; // in pixel
33    public final double mMaxInterpolationAngularThreshold; // in radian
34    public final double mMaxInterpolationDistanceThreshold; // in pixel
35    public final int mMaxInterpolationSegments;
36
37    private static final float DEFAULT_MIN_SAMPLING_DISTANCE = 0.0f; // dp
38    private static final int DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD = 15; // in degree
39    private static final float DEFAULT_MAX_INTERPOLATION_DISTANCE_THRESHOLD = 0.0f; // dp
40    private static final int DEFAULT_MAX_INTERPOLATION_SEGMENTS = 4;
41
42    public GestureStrokeDrawingParams(final TypedArray mainKeyboardViewAttr) {
43        mMinSamplingDistance = mainKeyboardViewAttr.getDimension(
44                R.styleable.MainKeyboardView_gestureTrailMinSamplingDistance,
45                DEFAULT_MIN_SAMPLING_DISTANCE);
46        final int interpolationAngularDegree = mainKeyboardViewAttr.getInteger(R.styleable
47                .MainKeyboardView_gestureTrailMaxInterpolationAngularThreshold, 0);
48        mMaxInterpolationAngularThreshold = (interpolationAngularDegree <= 0)
49                ? Math.toRadians(DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD)
50                : Math.toRadians(interpolationAngularDegree);
51        mMaxInterpolationDistanceThreshold = mainKeyboardViewAttr.getDimension(R.styleable
52                .MainKeyboardView_gestureTrailMaxInterpolationDistanceThreshold,
53                DEFAULT_MAX_INTERPOLATION_DISTANCE_THRESHOLD);
54        mMaxInterpolationSegments = mainKeyboardViewAttr.getInteger(
55                R.styleable.MainKeyboardView_gestureTrailMaxInterpolationSegments,
56                DEFAULT_MAX_INTERPOLATION_SEGMENTS);
57    }
58}
59