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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.fuelgauge;
import com.android.settings.R;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Typeface;
import android.os.BatteryStats;
import android.os.SystemClock;
import android.os.BatteryStats.HistoryItem;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
public class BatteryHistoryChart extends View {
static final int SANS = 1;
static final int SERIF = 2;
static final int MONOSPACE = 3;
static final int BATTERY_WARN = 29;
static final int BATTERY_CRITICAL = 14;
final Paint mBatteryBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final Paint mBatteryGoodPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final Paint mBatteryWarnPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final Paint mBatteryCriticalPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
final TextPaint mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
int mFontSize;
BatteryStats mStats;
long mStatsPeriod;
String mDurationString;
int mTextAscent;
int mTextDescent;
int mDurationStringWidth;
int mNumHist;
long mHistStart;
long mHistEnd;
int mBatLow;
int mBatHigh;
final Path mBatLevelPath = new Path();
int[] mBatLevelX;
int[] mBatLevelY;
byte[] mBatLevelValue;
int mNumBatLevel;
public BatteryHistoryChart(Context context, AttributeSet attrs) {
super(context, attrs);
mBatteryBackgroundPaint.setARGB(255, 128, 128, 128);
mBatteryBackgroundPaint.setStyle(Paint.Style.FILL);
mBatteryGoodPaint.setARGB(128, 0, 255, 0);
int lineWidth = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
2, getResources().getDisplayMetrics());
if (lineWidth <= 0) lineWidth = 1;
mBatteryGoodPaint.setStrokeWidth(lineWidth);
mBatteryWarnPaint.setARGB(128, 255, 255, 0);
mBatteryWarnPaint.setStrokeWidth(lineWidth);
mBatteryCriticalPaint.setARGB(192, 255, 0, 0);
mBatteryCriticalPaint.setStrokeWidth(lineWidth);
mTextPaint.density = getResources().getDisplayMetrics().density;
mTextPaint.setCompatibilityScaling(
getResources().getCompatibilityInfo().applicationScale);
TypedArray a =
context.obtainStyledAttributes(
attrs, R.styleable.BatteryHistoryChart, 0, 0);
ColorStateList textColor = null;
int textSize = 15;
int typefaceIndex = -1;
int styleIndex = -1;
TypedArray appearance = null;
int ap = a.getResourceId(R.styleable.BatteryHistoryChart_android_textAppearance, -1);
if (ap != -1) {
appearance = context.obtainStyledAttributes(ap,
com.android.internal.R.styleable.
TextAppearance);
}
if (appearance != null) {
int n = appearance.getIndexCount();
for (int i = 0; i < n; i++) {
int attr = appearance.getIndex(i);
switch (attr) {
case com.android.internal.R.styleable.TextAppearance_textColor:
textColor = appearance.getColorStateList(attr);
break;
case com.android.internal.R.styleable.TextAppearance_textSize:
textSize = appearance.getDimensionPixelSize(attr, textSize);
break;
case com.android.internal.R.styleable.TextAppearance_typeface:
typefaceIndex = appearance.getInt(attr, -1);
break;
case com.android.internal.R.styleable.TextAppearance_textStyle:
styleIndex = appearance.getInt(attr, -1);
break;
}
}
appearance.recycle();
}
int shadowcolor = 0;
float dx=0, dy=0, r=0;
int n = a.getIndexCount();
for (int i = 0; i < n; i++) {
int attr = a.getIndex(i);
switch (attr) {
case R.styleable.BatteryHistoryChart_android_shadowColor:
shadowcolor = a.getInt(attr, 0);
break;
case R.styleable.BatteryHistoryChart_android_shadowDx:
dx = a.getFloat(attr, 0);
break;
case R.styleable.BatteryHistoryChart_android_shadowDy:
dy = a.getFloat(attr, 0);
break;
case R.styleable.BatteryHistoryChart_android_shadowRadius:
r = a.getFloat(attr, 0);
break;
case R.styleable.BatteryHistoryChart_android_textColor:
textColor = a.getColorStateList(attr);
break;
case R.styleable.BatteryHistoryChart_android_textSize:
textSize = a.getDimensionPixelSize(attr, textSize);
break;
case R.styleable.BatteryHistoryChart_android_typeface:
typefaceIndex = a.getInt(attr, typefaceIndex);
break;
case R.styleable.BatteryHistoryChart_android_textStyle:
styleIndex = a.getInt(attr, styleIndex);
break;
}
}
mTextPaint.setColor(textColor.getDefaultColor());
mTextPaint.setTextSize(textSize);
Typeface tf = null;
switch (typefaceIndex) {
case SANS:
tf = Typeface.SANS_SERIF;
break;
case SERIF:
tf = Typeface.SERIF;
break;
case MONOSPACE:
tf = Typeface.MONOSPACE;
break;
}
setTypeface(tf, styleIndex);
if (shadowcolor != 0) {
mTextPaint.setShadowLayer(r, dx, dy, shadowcolor);
}
}
public void setTypeface(Typeface tf, int style) {
if (style > 0) {
if (tf == null) {
tf = Typeface.defaultFromStyle(style);
} else {
tf = Typeface.create(tf, style);
}
mTextPaint.setTypeface(tf);
// now compute what (if any) algorithmic styling is needed
int typefaceStyle = tf != null ? tf.getStyle() : 0;
int need = style & ~typefaceStyle;
mTextPaint.setFakeBoldText((need & Typeface.BOLD) != 0);
mTextPaint.setTextSkewX((need & Typeface.ITALIC) != 0 ? -0.25f : 0);
} else {
mTextPaint.setFakeBoldText(false);
mTextPaint.setTextSkewX(0);
mTextPaint.setTypeface(tf);
}
}
void setStats(BatteryStats stats) {
mStats = stats;
long uSecTime = mStats.computeBatteryRealtime(SystemClock.elapsedRealtime() * 1000,
BatteryStats.STATS_SINCE_CHARGED);
mStatsPeriod = uSecTime;
String durationString = Utils.formatElapsedTime(getContext(), mStatsPeriod / 1000);
mDurationString = getContext().getString(R.string.battery_stats_on_battery,
durationString);
BatteryStats.HistoryItem rec = stats.getHistory();
if (rec != null) {
mHistStart = rec.time;
mBatLow = mBatHigh = rec.batteryLevel;
}
int pos = 0;
int lastInteresting = 0;
byte lastLevel = -1;
mBatLow = 0;
mBatHigh = 100;
while (rec != null) {
pos++;
if (rec.cmd == HistoryItem.CMD_UPDATE && (rec.batteryLevel != lastLevel
|| pos == 1)) {
lastLevel = rec.batteryLevel;
lastInteresting = pos;
mHistEnd = rec.time;
}
rec = rec.next;
}
mNumHist = lastInteresting;
if (mHistEnd <= mHistStart) mHistEnd = mHistStart+1;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mDurationStringWidth = (int)mTextPaint.measureText(mDurationString);
mTextAscent = (int)mTextPaint.ascent();
mTextDescent = (int)mTextPaint.descent();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBatLevelPath.reset();
mBatLevelX = new int[w+5];
mBatLevelY = new int[w+5];
mBatLevelValue = new byte[w+5];
mNumBatLevel = 0;
final long timeStart = mHistStart;
final long timeChange = mHistEnd-mHistStart;
final int batLow = mBatLow;
final int batChange = mBatHigh-mBatLow;
BatteryStats.HistoryItem rec = mStats.getHistory();
int x = 0, y = 0, lastX = -1, lastY = -1, lastBatX = -1, lastBatY = -1;
byte lastBatValue = 0;
int i = 0, num = 0;
boolean first = true;
final int N = mNumHist;
while (rec != null && i < N) {
if (rec.cmd == BatteryStats.HistoryItem.CMD_UPDATE) {
x = (int)(((rec.time-timeStart)*w)/timeChange);
y = h-1 - ((rec.batteryLevel-batLow)*(h-3))/batChange;
if (first) {
first = false;
mBatLevelPath.moveTo(x, y);
mBatLevelX[mNumBatLevel] = x;
mBatLevelY[mNumBatLevel] = y;
mBatLevelValue[mNumBatLevel] = lastBatValue = rec.batteryLevel;
mNumBatLevel++;
lastX = lastBatX = x;
lastY = lastBatY = y;
} else {
if (lastX != x) {
// We have moved by at least a pixel.
if (lastY == y) {
// Battery level is still the same; don't plot,
// but remember it.
lastBatX = x;
lastBatY = y;
} else {
if (lastBatX >= 0) {
// Level stayed the same up to here; put in line.
mBatLevelPath.lineTo(lastBatX, lastBatY);
mBatLevelX[mNumBatLevel] = lastBatX;
mBatLevelY[mNumBatLevel] = lastBatY;
mBatLevelValue[mNumBatLevel] = lastBatValue;
mNumBatLevel++;
num++;
}
mBatLevelPath.lineTo(x, y);
mBatLevelX[mNumBatLevel] = x;
mBatLevelY[mNumBatLevel] = y;
mBatLevelValue[mNumBatLevel] = lastBatValue = rec.batteryLevel;
mNumBatLevel++;
num++;
lastX = x;
lastY = y;
lastBatX = -1;
}
}
}
}
rec = rec.next;
i++;
}
if (num == 0 || lastBatX >= 0) {
mBatLevelPath.lineTo(w, y);
mBatLevelX[mNumBatLevel] = w;
mBatLevelY[mNumBatLevel] = y;
mBatLevelValue[mNumBatLevel] = lastBatValue;
mNumBatLevel++;
}
mBatLevelPath.lineTo(w, h);
mBatLevelPath.lineTo(0, h);
mBatLevelPath.close();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final int width = getWidth();
final int height = getHeight();
canvas.drawPath(mBatLevelPath, mBatteryBackgroundPaint);
canvas.drawText(mDurationString, (width/2) - (mDurationStringWidth/2),
(height/2) - ((mTextDescent-mTextAscent)/2) - mTextAscent, mTextPaint);
int lastX = mBatLevelX[0];
int lastY = mBatLevelY[0];
for (int i=1; i<mNumBatLevel; i++) {
int x = mBatLevelX[i];
int y = mBatLevelY[i];
Paint paint;
byte value = mBatLevelValue[i];
if (value <= BATTERY_CRITICAL) paint = mBatteryCriticalPaint;
else if (value <= BATTERY_WARN) paint = mBatteryWarnPaint;
else paint = mBatteryGoodPaint;
canvas.drawLine(lastX, lastY, x, y, paint);
lastX = x;
lastY = y;
}
}
}
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