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/**
* Copyright (C) 2009 - 2013 SC 4ViewSoft SRL
*
* 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.codename1.charts.views;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.codename1.charts.compat.Canvas;
import com.codename1.charts.compat.Paint;
import com.codename1.charts.models.XYMultipleSeriesDataset;
import com.codename1.charts.models.XYSeries;
import com.codename1.charts.renderers.XYMultipleSeriesRenderer;
import java.util.Calendar;
import java.util.TimeZone;
/**
* The time chart rendering class.
*/
public class TimeChart extends LineChart {
/**
* The number of milliseconds in a minute.
*/
private static final int MILLIS_TO_MINUTES = 60000;
/**
* This is missing from the Codename One Calendar object, but required by
* TimeZone.getOffset()
*/
private static final int ERA = 0;
/**
/** The constant to identify this chart type. */
public static final String TYPE = "Time";
/** The number of milliseconds in a day. */
public static final long DAY = 24 * 60 * 60 * 1000;
/** The date format pattern to be used in formatting the X axis labels. */
private String mDateFormat;
/** The starting point for labels. */
private Double mStartPoint;
TimeChart() {
}
/**
* Builds a new time chart instance.
*
* @param dataset the multiple series dataset
* @param renderer the multiple series renderer
*/
public TimeChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer) {
super(dataset, renderer);
}
/**
* Returns the date format pattern to be used for formatting the X axis
* labels.
*
* @return the date format pattern for the X axis labels
*/
public String getDateFormat() {
return mDateFormat;
}
/**
* Sets the date format pattern to be used for formatting the X axis labels.
*
* @param format the date format pattern for the X axis labels. If null, an
* appropriate default format will be used.
*/
public void setDateFormat(String format) {
mDateFormat = format;
}
/**
* The graphical representation of the labels on the X axis.
*
* @param xLabels the X labels values
* @param xTextLabelLocations the X text label locations
* @param canvas the canvas to paint to
* @param paint the paint to be used for drawing
* @param left the left value of the labels area
* @param top the top value of the labels area
* @param bottom the bottom value of the labels area
* @param xPixelsPerUnit the amount of pixels per one unit in the chart labels
* @param minX the minimum value on the X axis in the chart
* @param maxX the maximum value on the X axis in the chart
*/
@Override
protected void drawXLabels(List xLabels, Double[] xTextLabelLocations, Canvas canvas,
Paint paint, int left, int top, int bottom, double xPixelsPerUnit, double minX, double maxX) {
int length = xLabels.size();
if (length > 0) {
boolean showLabels = mRenderer.isShowLabels();
boolean showGridY = mRenderer.isShowGridY();
boolean showTickMarks = mRenderer.isShowTickMarks();
DateFormat format = getDateFormat(xLabels.get(0), xLabels.get(length - 1));
for (int i = 0; i < length; i++) {
long label = Math.round(xLabels.get(i));
float xLabel = (float) (left + xPixelsPerUnit * (label - minX));
if (showLabels) {
paint.setColor(mRenderer.getXLabelsColor());
if (showTickMarks) {
canvas.drawLine(xLabel, bottom, xLabel, bottom + mRenderer.getLabelsTextSize() / 3,
paint);
}
drawText(canvas, format.format(new Date(label)), xLabel,
bottom + mRenderer.getLabelsTextSize() * 4 / 3 + mRenderer.getXLabelsPadding(),
paint, mRenderer.getXLabelsAngle());
}
if (showGridY) {
paint.setColor(mRenderer.getGridColor(0));
canvas.drawLine(xLabel, bottom, xLabel, top, paint);
}
}
}
drawXTextLabels(xTextLabelLocations, canvas, paint, true, left, top, bottom, xPixelsPerUnit,
minX, maxX);
}
/**
* Returns the date format pattern to be used, based on the date range.
*
* @param start the start date in milliseconds
* @param end the end date in milliseconds
* @return the date format
*/
private DateFormat getDateFormat(double start, double end) {
if (mDateFormat != null) {
SimpleDateFormat format = null;
try {
format = new SimpleDateFormat(mDateFormat);
return format;
} catch (Exception e) {
// do nothing here
}
}
DateFormat format = SimpleDateFormat.getDateInstance(SimpleDateFormat.MEDIUM);
double diff = end - start;
if (diff > DAY && diff < 5 * DAY) {
format = SimpleDateFormat.getDateTimeInstance(SimpleDateFormat.SHORT, SimpleDateFormat.SHORT);
} else if (diff < DAY) {
format = SimpleDateFormat.getTimeInstance(SimpleDateFormat.MEDIUM);
}
return format;
}
/**
* Returns the chart type identifier.
*
* @return the chart type
*/
public String getChartType() {
return TYPE;
}
@Override
protected List getXLabels(double min, double max, int count) {
final List result = new ArrayList();
if (!mRenderer.isXRoundedLabels()) {
if (mDataset.getSeriesCount() > 0) {
XYSeries series = mDataset.getSeriesAt(0);
int length = series.getItemCount();
int intervalLength = 0;
int startIndex = -1;
for (int i = 0; i < length; i++) {
double value = series.getX(i);
if (min <= value && value <= max) {
intervalLength++;
if (startIndex < 0) {
startIndex = i;
}
}
}
if (intervalLength < count) {
for (int i = startIndex; i < startIndex + intervalLength; i++) {
result.add(series.getX(i));
}
} else {
float step = (float) intervalLength / count;
int intervalCount = 0;
for (int i = 0; i < length && intervalCount < count; i++) {
double value = series.getX(Math.round(i * step));
if (min <= value && value <= max) {
result.add(value);
intervalCount++;
}
}
}
return result;
} else {
return super.getXLabels(min, max, count);
}
}
if (mStartPoint == null) {
TimeZone tz = TimeZone.getDefault();
Calendar cal = Calendar.getInstance(tz);
cal.setTime(new Date(Math.round(min)));
int offset = getDSTOffset(cal);
mStartPoint = min - (min % DAY) + DAY + offset * 60 * 60 * 1000;
}
if (count > 25) {
count = 25;
}
final double cycleMath = (max - min) / count;
if (cycleMath <= 0) {
return result;
}
double cycle = DAY;
if (cycleMath <= DAY) {
while (cycleMath < cycle / 2) {
cycle = cycle / 2;
}
} else {
while (cycleMath > cycle) {
cycle = cycle * 2;
}
}
double val = mStartPoint - Math.floor((mStartPoint - min) / cycle) * cycle;
int i = 0;
while (val < max && i++ <= count) {
result.add(val);
val += cycle;
}
return result;
}
/**
* Determine the number of minutes to adjust the date for local DST. This
* should provide a historically correct value, also accounting for changes
* in GMT offset. See TimeZone javadoc for more details.
*
* @param source
* @return
*/
int getDSTOffset(Calendar source) {
TimeZone localTimezone = Calendar.getInstance().getTimeZone();
int rawOffset = localTimezone.getRawOffset() / MILLIS_TO_MINUTES;
return getOffsetInMinutes(source, localTimezone) - rawOffset;
}
/**
* Get the offset from GMT for a given timezone.
*
* @param source
* @param timezone
* @return
*/
int getOffsetInMinutes(Calendar source, TimeZone timezone) {
return timezone.getOffset(source.get(ERA), source.get(Calendar.YEAR), source.get(Calendar.MONTH),
source.get(Calendar.DAY_OF_MONTH), source.get(Calendar.DAY_OF_WEEK), source.get(Calendar.MILLISECOND))
/ MILLIS_TO_MINUTES;
}
}
