ChartNetworkSeriesView.java revision 8a50364a71e7c261b54840210f8bacff5abecb34 
1/*
2 * Copyright (C) 2011 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.settings.widget;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Color;
22import android.graphics.Paint;
23import android.graphics.Paint.Style;
24import android.graphics.Path;
25import android.graphics.RectF;
26import android.net.NetworkStatsHistory;
27import android.util.Log;
28import android.view.View;
29
30import com.google.common.base.Preconditions;
31
32/**
33 * {@link NetworkStatsHistory} series to render inside a {@link ChartView},
34 * using {@link ChartAxis} to map into screen coordinates.
35 */
36public class ChartNetworkSeriesView extends View {
37    private static final String TAG = "ChartNetworkSeriesView";
38    private static final boolean LOGD = true;
39
40    private final ChartAxis mHoriz;
41    private final ChartAxis mVert;
42
43    private final Paint mPaintStroke;
44    private final Paint mPaintFill;
45    private final Paint mPaintFillDisabled;
46
47    private NetworkStatsHistory mStats;
48
49    private Path mPathStroke;
50    private Path mPathFill;
51
52    private ChartSweepView mSweep1;
53    private ChartSweepView mSweep2;
54
55    public ChartNetworkSeriesView(Context context, ChartAxis horiz, ChartAxis vert) {
56        super(context);
57
58        mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
59        mVert = Preconditions.checkNotNull(vert, "missing vert");
60
61        mPaintStroke = new Paint();
62        mPaintStroke.setStrokeWidth(6.0f);
63        mPaintStroke.setColor(Color.parseColor("#24aae1"));
64        mPaintStroke.setStyle(Style.STROKE);
65        mPaintStroke.setAntiAlias(true);
66
67        mPaintFill = new Paint();
68        mPaintFill.setColor(Color.parseColor("#c050ade5"));
69        mPaintFill.setStyle(Style.FILL);
70        mPaintFill.setAntiAlias(true);
71
72        mPaintFillDisabled = new Paint();
73        mPaintFillDisabled.setColor(Color.parseColor("#88566abc"));
74        mPaintFillDisabled.setStyle(Style.FILL);
75        mPaintFillDisabled.setAntiAlias(true);
76
77        mPathStroke = new Path();
78        mPathFill = new Path();
79    }
80
81    public void bindNetworkStats(NetworkStatsHistory stats) {
82        mStats = stats;
83
84        mPathStroke.reset();
85        mPathFill.reset();
86    }
87
88    public void bindSweepRange(ChartSweepView sweep1, ChartSweepView sweep2) {
89        // TODO: generalize to support vertical sweeps
90        // TODO: enforce that both sweeps are along same dimension
91
92        mSweep1 = Preconditions.checkNotNull(sweep1, "missing sweep1");
93        mSweep2 = Preconditions.checkNotNull(sweep2, "missing sweep2");
94    }
95
96    @Override
97    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
98        generatePath();
99    }
100
101    /**
102     * Erase any existing {@link Path} and generate series outline based on
103     * currently bound {@link NetworkStatsHistory} data.
104     */
105    public void generatePath() {
106        if (LOGD) Log.d(TAG, "generatePath()");
107
108        mPathStroke.reset();
109        mPathFill.reset();
110
111        // bail when not enough stats to render
112        if (mStats == null || mStats.bucketCount < 2) return;
113
114        final int width = getWidth();
115        final int height = getHeight();
116
117        boolean started = false;
118        float firstX = 0;
119        float lastX = 0;
120        float lastY = 0;
121
122        // TODO: count fractional data from first bucket crossing start;
123        // currently it only accepts first full bucket.
124
125        long totalData = 0;
126
127        for (int i = 0; i < mStats.bucketCount; i++) {
128            final float x = mHoriz.convertToPoint(mStats.bucketStart[i]);
129            final float y = mVert.convertToPoint(totalData);
130
131            // skip until we find first stats on screen
132            if (i > 0 && !started && x > 0) {
133                mPathStroke.moveTo(lastX, lastY);
134                mPathFill.moveTo(lastX, lastY);
135                started = true;
136                firstX = x;
137            }
138
139            if (started) {
140                mPathStroke.lineTo(x, y);
141                mPathFill.lineTo(x, y);
142                totalData += mStats.rx[i] + mStats.tx[i];
143            }
144
145            // skip if beyond view
146            if (x > width) break;
147
148            lastX = x;
149            lastY = y;
150        }
151
152        if (LOGD) {
153            final RectF bounds = new RectF();
154            mPathFill.computeBounds(bounds, true);
155            Log.d(TAG, "onLayout() rendered with bounds=" + bounds.toString());
156        }
157
158        // drop to bottom of graph from current location
159        mPathFill.lineTo(lastX, height);
160        mPathFill.lineTo(firstX, height);
161    }
162
163    @Override
164    protected void onDraw(Canvas canvas) {
165
166        // clip to sweep area
167        final float sweep1 = mSweep1.getPoint();
168        final float sweep2 = mSweep2.getPoint();
169        final float sweepLeft = Math.min(sweep1, sweep2);
170        final float sweepRight = Math.max(sweep1, sweep2);
171
172        int save;
173
174        save = canvas.save();
175        canvas.clipRect(0, 0, sweepLeft, getHeight());
176        canvas.drawPath(mPathFill, mPaintFillDisabled);
177        canvas.restoreToCount(save);
178
179        save = canvas.save();
180        canvas.clipRect(sweepRight, 0, getWidth(), getHeight());
181        canvas.drawPath(mPathFill, mPaintFillDisabled);
182        canvas.restoreToCount(save);
183
184        save = canvas.save();
185        canvas.clipRect(sweepLeft, 0, sweepRight, getHeight());
186        canvas.drawPath(mPathFill, mPaintFill);
187        canvas.drawPath(mPathStroke, mPaintStroke);
188        canvas.restoreToCount(save);
189
190    }
191}
192