jvsdfx-mm/src/main/java/com/pivotal/javafx/scene/chart/DateAxis.java - geode - Git at Google

 /*
  * Portions of this source copied with love from https://bitbucket.org/sco0ter/extfx
  * under the following license:
  *
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, Christian Schudt
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 package com.pivotal.javafx.scene.chart;

 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collections;
 import java.util.Date;
 import java.util.List;

 import javafx.animation.KeyFrame;
 import javafx.animation.KeyValue;
 import javafx.beans.property.ReadOnlyDoubleWrapper;
 import javafx.scene.chart.ValueAxis;
 import javafx.util.Duration;
 import javafx.util.StringConverter;

 import com.sun.javafx.charts.ChartLayoutAnimator;

 /**
  * Implemenation of {@link ValueAxis} similar to {@link NumberAxis} but with
  * formatting for date and time.
  *
  * @author jbarrett
  *
  */
 public final class DateAxis extends ValueAxis<Number> {

   private ChartLayoutAnimator animator = new ChartLayoutAnimator(this);

   private Object currentAnimationID;

   private Interval actualInterval = Interval.DECADE;

   /**
    * Default constructor. By default the lower and upper bound are calculated by
    * the data.
    */
   public DateAxis() {
   }

   /**
    * Constructs a date axis with fix lower and upper bounds.
    *
    * @param lowerBound
    *          The lower bound.
    * @param upperBound
    *          The upper bound.
    */
   public DateAxis(Long lowerBound, Long upperBound) {
     this();
     setAutoRanging(false);
     setLowerBound(lowerBound);
     setUpperBound(upperBound);
   }

   /**
    * Constructs a date axis with a label and fix lower and upper bounds.
    *
    * @param axisLabel
    *          The label for the axis.
    * @param lowerBound
    *          The lower bound.
    * @param upperBound
    *          The upper bound.
    */
   public DateAxis(String axisLabel, Long lowerBound, Long upperBound) {
     this(lowerBound, upperBound);
     setLabel(axisLabel);
   }

   @Override
   protected Object autoRange(double minValue, double maxValue, double length, double labelSize) {
     return new Object[] { (long) minValue, (long) maxValue, calculateNewScale(length, (long) minValue, (long) maxValue) };
   }

   @Override
   protected void setRange(Object range, boolean animating) {
     Object[] r = (Object[]) range;
     long oldLowerBound = (long) getLowerBound();
     long lower = (long) r[0];
     long upper = (long) r[1];
     double scale = (double) r[2];
     setLowerBound(lower);
     setUpperBound(upper);

     if (animating) {
       animator.stop(currentAnimationID);
       currentAnimationID = animator.animate(
           new KeyFrame(Duration.ZERO,
               new KeyValue(currentLowerBound, oldLowerBound),
               new KeyValue(scalePropertyImplProtected(), getScale())),
           new KeyFrame(Duration.millis(700),
               new KeyValue(currentLowerBound, lower),
               new KeyValue(scalePropertyImplProtected(), scale)));

     } else {
       currentLowerBound.set(getLowerBound());
       setScale(scale);
     }
   }

   @Override
   protected Object getRange() {
     return new Object[] { (long) getLowerBound(), (long) getUpperBound() };
   }

   @Override
   protected List<Number> calculateTickValues(double v, Object range) {
     Object[] r = (Object[]) range;
     long lower = (long) r[0];
     long upper = (long) r[1];

     List<Date> dateList = new ArrayList<Date>();
     Calendar calendar = Calendar.getInstance();

     // The preferred gap which should be between two tick marks.
     double averageTickGap = 100;
     double averageTicks = v / averageTickGap;

     List<Date> previousDateList = new ArrayList<Date>();

     Interval previousInterval = Interval.values()[0];

     // Starting with the greatest interval, add one of each calendar unit.
     for (Interval interval : Interval.values()) {
       // Reset the calendar.
       calendar.setTime(new Date(lower));
       // Clear the list.
       dateList.clear();
       previousDateList.clear();
       actualInterval = interval;

       // Loop as long we exceeded the upper bound.
       while (calendar.getTime().getTime() <= upper) {
         dateList.add(calendar.getTime());
         calendar.add(interval.interval, interval.amount);
       }
       // Then check the size of the list. If it is greater than the amount of
       // ticks, take that list.
       if (dateList.size() > averageTicks) {
         calendar.setTime(new Date(lower));
         // Recheck if the previous interval is better suited.
         while (calendar.getTime().getTime() <= upper) {
           previousDateList.add(calendar.getTime());
           calendar.add(previousInterval.interval, previousInterval.amount);
         }
         break;
       }

       previousInterval = interval;
     }
     if (previousDateList.size() - averageTicks > averageTicks - dateList.size()) {
       dateList = previousDateList;
       actualInterval = previousInterval;
     }

     // At last add the upper bound.
     dateList.add(new Date(upper));

     List<Number> evenDateList = makeDatesEven(dateList, calendar);
     // If there are at least three dates, check if the gap between the lower
     // date and the second date is at least half the gap of the second and third
     // date.
     // Do the same for the upper bound.
     // If gaps between dates are to small, remove one of them.
     // This can occur, e.g. if the lower bound is 25.12.2013 and years are
     // shown. Then the next year shown would be 2014 (01.01.2014) which would be
     // too narrow to 25.12.2013.
     if (evenDateList.size() > 2) {

       long secondDate = evenDateList.get(1).longValue();
       long thirdDate = evenDateList.get(2).longValue();
       long lastDate = evenDateList.get(dateList.size() - 2).longValue();
       long previousLastDate = evenDateList.get(dateList.size() - 3).longValue();

       // If the second date is too near by the lower bound, remove it.
       if (secondDate - lower < (thirdDate - secondDate) / 2) {
         evenDateList.remove(secondDate);
       }

       // If difference from the upper bound to the last date is less than the
       // half of the difference of the previous two dates,
       // we better remove the last date, as it comes to close to the upper
       // bound.
       if (upper - lastDate < (lastDate - previousLastDate) / 2) {
         evenDateList.remove(lastDate);
       }
     }

     return evenDateList;
   }

   @Override
   protected String getTickMarkLabel(final Number ts) {
     final Date date = new Date(ts.longValue());

     StringConverter<Number> converter = getTickLabelFormatter();
     if (converter != null) {
       return converter.toString(date.getTime());
     }

     DateFormat dateFormat;
     Calendar calendar = Calendar.getInstance();
     calendar.setTime(date);

     if (actualInterval.interval == Calendar.YEAR && calendar.get(Calendar.MONTH) == 0 && calendar.get(Calendar.DATE) == 1) {
       dateFormat = new SimpleDateFormat("yyyy");
     } else if (actualInterval.interval == Calendar.MONTH && calendar.get(Calendar.DATE) == 1) {
       dateFormat = new SimpleDateFormat("MMM yy");
     } else {
       switch (actualInterval.interval) {
       case Calendar.DATE:
       case Calendar.WEEK_OF_YEAR:
       default:
         dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM);
         break;
       case Calendar.HOUR:
       case Calendar.MINUTE:
         dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT);
         break;
       case Calendar.SECOND:
         dateFormat = DateFormat.getTimeInstance(DateFormat.MEDIUM);
         break;
       case Calendar.MILLISECOND:
         dateFormat = DateFormat.getTimeInstance(DateFormat.FULL);
         break;
       }
     }
     return dateFormat.format(date);
   }

   /**
    * Makes dates even, in the sense of that years always begin in January,
    * months always begin on the 1st and days always at midnight.
    *
    * @param dates
    *          The list of dates.
    * @return The new list of dates.
    */
   private List<Number> makeDatesEven(List<Date> dates, Calendar calendar) {
     // If the dates contain more dates than just the lower and upper bounds,
     // make the dates in between even.
     // TODO if (dates.size() > 2) {
     List<Number> evenDates = new ArrayList<Number>();

     // For each interval, modify the date slightly by a few millis, to make sure
     // they are different days.
     // This is because Axis stores each value and won't update the tick labels,
     // if the value is already known.
     // This happens if you display days and then add a date many years in the
     // future the tick label will still be displayed as day.
     for (int i = 0; i < dates.size(); i++) {
       calendar.setTime(dates.get(i));
       switch (actualInterval.interval) {
       case Calendar.YEAR:
         // If its not the first or last date (lower and upper bound), make the
         // year begin with first month and let the months begin with first day.
         if (i != 0 && i != dates.size() - 1) {
           calendar.set(Calendar.MONTH, 0);
           calendar.set(Calendar.DATE, 1);
         }
         calendar.set(Calendar.HOUR_OF_DAY, 0);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MILLISECOND, 6);
         break;
       case Calendar.MONTH:
         // If its not the first or last date (lower and upper bound), make the
         // months begin with first day.
         if (i != 0 && i != dates.size() - 1) {
           calendar.set(Calendar.DATE, 1);
         }
         calendar.set(Calendar.HOUR_OF_DAY, 0);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MILLISECOND, 5);
         break;
       case Calendar.WEEK_OF_YEAR:
         // Make weeks begin with first day of week?
         calendar.set(Calendar.HOUR_OF_DAY, 0);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MILLISECOND, 4);
         break;
       case Calendar.DATE:
         calendar.set(Calendar.HOUR_OF_DAY, 0);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MILLISECOND, 3);
         break;
       case Calendar.HOUR:
         if (i != 0 && i != dates.size() - 1) {
           calendar.set(Calendar.MINUTE, 0);
           calendar.set(Calendar.SECOND, 0);
         }
         calendar.set(Calendar.MILLISECOND, 2);
         break;
       case Calendar.MINUTE:
         if (i != 0 && i != dates.size() - 1) {
           calendar.set(Calendar.SECOND, 0);
         }
         calendar.set(Calendar.MILLISECOND, 1);
         break;
       case Calendar.SECOND:
         calendar.set(Calendar.MILLISECOND, 0);
         break;

       }
       evenDates.add(calendar.getTime().getTime());
     }

     return evenDates;
     // } else {
     // return dates;
     // }
   }

   /**
    * The intervals, which are used for the tick labels. Beginning with the
    * largest interval, the axis tries to calculate the tick values for this
    * interval. If a smaller interval is better suited for, that one is taken.
    */
   private enum Interval {
     DECADE(Calendar.YEAR, 10), YEAR(Calendar.YEAR, 1), MONTH_6(Calendar.MONTH, 6), MONTH_3(Calendar.MONTH, 3), MONTH_1(Calendar.MONTH, 1), WEEK(
         Calendar.WEEK_OF_YEAR, 1), DAY(Calendar.DATE, 1), HOUR_12(Calendar.HOUR, 12), HOUR_6(Calendar.HOUR, 6), HOUR_3(Calendar.HOUR, 3), HOUR_1(Calendar.HOUR,
         1), MINUTE_15(Calendar.MINUTE, 15), MINUTE_5(Calendar.MINUTE, 5), MINUTE_1(Calendar.MINUTE, 1), SECOND_15(Calendar.SECOND, 15), SECOND_5(
         Calendar.SECOND, 5), SECOND_1(Calendar.SECOND, 1), MILLISECOND(Calendar.MILLISECOND, 1);

     private final int amount;

     private final int interval;

     private Interval(int interval, int amount) {
       this.interval = interval;
       this.amount = amount;
     }
   }

   @Override
   protected List<Number> calculateMinorTickMarks() {
     return Collections.<Number>emptyList();
   }

   /* Access to package protected method */
   private static final Method scalePropertyImplMethod;

   static {
     try {
       scalePropertyImplMethod = ValueAxis.class.getDeclaredMethod("scalePropertyImpl");
       scalePropertyImplMethod.setAccessible(true);
     } catch (SecurityException | NoSuchMethodException e) {
       throw new IllegalStateException(e);
     }
   }

   protected ReadOnlyDoubleWrapper scalePropertyImplProtected() {
     try {
       return (ReadOnlyDoubleWrapper) scalePropertyImplMethod.invoke(this);
     } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
       throw new IllegalStateException(e);
     }
   }

 }
	/*
	* Portions of this source copied with love from https://bitbucket.org/sco0ter/extfx
	* under the following license:
	*
	* The MIT License (MIT)
	*
	* Copyright (c) 2013, Christian Schudt
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	package com.pivotal.javafx.scene.chart;

	import java.lang.reflect.InvocationTargetException;
	import java.lang.reflect.Method;
	import java.text.DateFormat;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Calendar;
	import java.util.Collections;
	import java.util.Date;
	import java.util.List;

	import javafx.animation.KeyFrame;
	import javafx.animation.KeyValue;
	import javafx.beans.property.ReadOnlyDoubleWrapper;
	import javafx.scene.chart.ValueAxis;
	import javafx.util.Duration;
	import javafx.util.StringConverter;

	import com.sun.javafx.charts.ChartLayoutAnimator;

	/**
	* Implemenation of {@link ValueAxis} similar to {@link NumberAxis} but with
	* formatting for date and time.
	*
	* @author jbarrett
	*
	*/
	public final class DateAxis extends ValueAxis<Number> {

	private ChartLayoutAnimator animator = new ChartLayoutAnimator(this);

	private Object currentAnimationID;

	private Interval actualInterval = Interval.DECADE;

	/**
	* Default constructor. By default the lower and upper bound are calculated by
	* the data.
	*/
	public DateAxis() {
	}

	/**
	* Constructs a date axis with fix lower and upper bounds.
	*
	* @param lowerBound
	* The lower bound.
	* @param upperBound
	* The upper bound.
	*/
	public DateAxis(Long lowerBound, Long upperBound) {
	this();
	setAutoRanging(false);
	setLowerBound(lowerBound);
	setUpperBound(upperBound);
	}

	/**
	* Constructs a date axis with a label and fix lower and upper bounds.
	*
	* @param axisLabel
	* The label for the axis.
	* @param lowerBound
	* The lower bound.
	* @param upperBound
	* The upper bound.
	*/
	public DateAxis(String axisLabel, Long lowerBound, Long upperBound) {
	this(lowerBound, upperBound);
	setLabel(axisLabel);
	}

	@Override
	protected Object autoRange(double minValue, double maxValue, double length, double labelSize) {
	return new Object[] { (long) minValue, (long) maxValue, calculateNewScale(length, (long) minValue, (long) maxValue) };
	}

	@Override
	protected void setRange(Object range, boolean animating) {
	Object[] r = (Object[]) range;
	long oldLowerBound = (long) getLowerBound();
	long lower = (long) r[0];
	long upper = (long) r[1];
	double scale = (double) r[2];
	setLowerBound(lower);
	setUpperBound(upper);

	if (animating) {
	animator.stop(currentAnimationID);
	currentAnimationID = animator.animate(
	new KeyFrame(Duration.ZERO,
	new KeyValue(currentLowerBound, oldLowerBound),
	new KeyValue(scalePropertyImplProtected(), getScale())),
	new KeyFrame(Duration.millis(700),
	new KeyValue(currentLowerBound, lower),
	new KeyValue(scalePropertyImplProtected(), scale)));

	} else {
	currentLowerBound.set(getLowerBound());
	setScale(scale);
	}
	}

	@Override
	protected Object getRange() {
	return new Object[] { (long) getLowerBound(), (long) getUpperBound() };
	}

	@Override
	protected List<Number> calculateTickValues(double v, Object range) {
	Object[] r = (Object[]) range;
	long lower = (long) r[0];
	long upper = (long) r[1];

	List<Date> dateList = new ArrayList<Date>();
	Calendar calendar = Calendar.getInstance();

	// The preferred gap which should be between two tick marks.
	double averageTickGap = 100;
	double averageTicks = v / averageTickGap;

	List<Date> previousDateList = new ArrayList<Date>();

	Interval previousInterval = Interval.values()[0];

	// Starting with the greatest interval, add one of each calendar unit.
	for (Interval interval : Interval.values()) {
	// Reset the calendar.
	calendar.setTime(new Date(lower));
	// Clear the list.
	dateList.clear();
	previousDateList.clear();
	actualInterval = interval;

	// Loop as long we exceeded the upper bound.
	while (calendar.getTime().getTime() <= upper) {
	dateList.add(calendar.getTime());
	calendar.add(interval.interval, interval.amount);
	}
	// Then check the size of the list. If it is greater than the amount of
	// ticks, take that list.
	if (dateList.size() > averageTicks) {
	calendar.setTime(new Date(lower));
	// Recheck if the previous interval is better suited.
	while (calendar.getTime().getTime() <= upper) {
	previousDateList.add(calendar.getTime());
	calendar.add(previousInterval.interval, previousInterval.amount);
	}
	break;
	}

	previousInterval = interval;
	}
	if (previousDateList.size() - averageTicks > averageTicks - dateList.size()) {
	dateList = previousDateList;
	actualInterval = previousInterval;
	}

	// At last add the upper bound.
	dateList.add(new Date(upper));

	List<Number> evenDateList = makeDatesEven(dateList, calendar);
	// If there are at least three dates, check if the gap between the lower
	// date and the second date is at least half the gap of the second and third
	// date.
	// Do the same for the upper bound.
	// If gaps between dates are to small, remove one of them.
	// This can occur, e.g. if the lower bound is 25.12.2013 and years are
	// shown. Then the next year shown would be 2014 (01.01.2014) which would be
	// too narrow to 25.12.2013.
	if (evenDateList.size() > 2) {

	long secondDate = evenDateList.get(1).longValue();
	long thirdDate = evenDateList.get(2).longValue();
	long lastDate = evenDateList.get(dateList.size() - 2).longValue();
	long previousLastDate = evenDateList.get(dateList.size() - 3).longValue();

	// If the second date is too near by the lower bound, remove it.
	if (secondDate - lower < (thirdDate - secondDate) / 2) {
	evenDateList.remove(secondDate);
	}

	// If difference from the upper bound to the last date is less than the
	// half of the difference of the previous two dates,
	// we better remove the last date, as it comes to close to the upper
	// bound.
	if (upper - lastDate < (lastDate - previousLastDate) / 2) {
	evenDateList.remove(lastDate);
	}
	}

	return evenDateList;
	}

	@Override
	protected String getTickMarkLabel(final Number ts) {
	final Date date = new Date(ts.longValue());

	StringConverter<Number> converter = getTickLabelFormatter();
	if (converter != null) {
	return converter.toString(date.getTime());
	}

	DateFormat dateFormat;
	Calendar calendar = Calendar.getInstance();
	calendar.setTime(date);

	if (actualInterval.interval == Calendar.YEAR && calendar.get(Calendar.MONTH) == 0 && calendar.get(Calendar.DATE) == 1) {
	dateFormat = new SimpleDateFormat("yyyy");
	} else if (actualInterval.interval == Calendar.MONTH && calendar.get(Calendar.DATE) == 1) {
	dateFormat = new SimpleDateFormat("MMM yy");
	} else {
	switch (actualInterval.interval) {
	case Calendar.DATE:
	case Calendar.WEEK_OF_YEAR:
	default:
	dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM);
	break;
	case Calendar.HOUR:
	case Calendar.MINUTE:
	dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT);
	break;
	case Calendar.SECOND:
	dateFormat = DateFormat.getTimeInstance(DateFormat.MEDIUM);
	break;
	case Calendar.MILLISECOND:
	dateFormat = DateFormat.getTimeInstance(DateFormat.FULL);
	break;
	}
	}
	return dateFormat.format(date);
	}

	/**
	* Makes dates even, in the sense of that years always begin in January,
	* months always begin on the 1st and days always at midnight.
	*
	* @param dates
	* The list of dates.
	* @return The new list of dates.
	*/
	private List<Number> makeDatesEven(List<Date> dates, Calendar calendar) {
	// If the dates contain more dates than just the lower and upper bounds,
	// make the dates in between even.
	// TODO if (dates.size() > 2) {
	List<Number> evenDates = new ArrayList<Number>();

	// For each interval, modify the date slightly by a few millis, to make sure
	// they are different days.
	// This is because Axis stores each value and won't update the tick labels,
	// if the value is already known.
	// This happens if you display days and then add a date many years in the
	// future the tick label will still be displayed as day.
	for (int i = 0; i < dates.size(); i++) {
	calendar.setTime(dates.get(i));
	switch (actualInterval.interval) {
	case Calendar.YEAR:
	// If its not the first or last date (lower and upper bound), make the
	// year begin with first month and let the months begin with first day.
	if (i != 0 && i != dates.size() - 1) {
	calendar.set(Calendar.MONTH, 0);
	calendar.set(Calendar.DATE, 1);
	}
	calendar.set(Calendar.HOUR_OF_DAY, 0);
	calendar.set(Calendar.MINUTE, 0);
	calendar.set(Calendar.SECOND, 0);
	calendar.set(Calendar.MILLISECOND, 6);
	break;
	case Calendar.MONTH:
	// If its not the first or last date (lower and upper bound), make the
	// months begin with first day.
	if (i != 0 && i != dates.size() - 1) {
	calendar.set(Calendar.DATE, 1);
	}
	calendar.set(Calendar.HOUR_OF_DAY, 0);
	calendar.set(Calendar.MINUTE, 0);
	calendar.set(Calendar.SECOND, 0);
	calendar.set(Calendar.MILLISECOND, 5);
	break;
	case Calendar.WEEK_OF_YEAR:
	// Make weeks begin with first day of week?
	calendar.set(Calendar.HOUR_OF_DAY, 0);
	calendar.set(Calendar.MINUTE, 0);
	calendar.set(Calendar.SECOND, 0);
	calendar.set(Calendar.MILLISECOND, 4);
	break;
	case Calendar.DATE:
	calendar.set(Calendar.HOUR_OF_DAY, 0);
	calendar.set(Calendar.MINUTE, 0);
	calendar.set(Calendar.SECOND, 0);
	calendar.set(Calendar.MILLISECOND, 3);
	break;
	case Calendar.HOUR:
	if (i != 0 && i != dates.size() - 1) {
	calendar.set(Calendar.MINUTE, 0);
	calendar.set(Calendar.SECOND, 0);
	}
	calendar.set(Calendar.MILLISECOND, 2);
	break;
	case Calendar.MINUTE:
	if (i != 0 && i != dates.size() - 1) {
	calendar.set(Calendar.SECOND, 0);
	}
	calendar.set(Calendar.MILLISECOND, 1);
	break;
	case Calendar.SECOND:
	calendar.set(Calendar.MILLISECOND, 0);
	break;

	}
	evenDates.add(calendar.getTime().getTime());
	}

	return evenDates;
	// } else {
	// return dates;
	// }
	}

	/**
	* The intervals, which are used for the tick labels. Beginning with the
	* largest interval, the axis tries to calculate the tick values for this
	* interval. If a smaller interval is better suited for, that one is taken.
	*/
	private enum Interval {
	DECADE(Calendar.YEAR, 10), YEAR(Calendar.YEAR, 1), MONTH_6(Calendar.MONTH, 6), MONTH_3(Calendar.MONTH, 3), MONTH_1(Calendar.MONTH, 1), WEEK(
	Calendar.WEEK_OF_YEAR, 1), DAY(Calendar.DATE, 1), HOUR_12(Calendar.HOUR, 12), HOUR_6(Calendar.HOUR, 6), HOUR_3(Calendar.HOUR, 3), HOUR_1(Calendar.HOUR,
	1), MINUTE_15(Calendar.MINUTE, 15), MINUTE_5(Calendar.MINUTE, 5), MINUTE_1(Calendar.MINUTE, 1), SECOND_15(Calendar.SECOND, 15), SECOND_5(
	Calendar.SECOND, 5), SECOND_1(Calendar.SECOND, 1), MILLISECOND(Calendar.MILLISECOND, 1);

	private final int amount;

	private final int interval;

	private Interval(int interval, int amount) {
	this.interval = interval;
	this.amount = amount;
	}
	}

	@Override
	protected List<Number> calculateMinorTickMarks() {
	return Collections.<Number>emptyList();
	}

	/* Access to package protected method */
	private static final Method scalePropertyImplMethod;

	static {
	try {
	scalePropertyImplMethod = ValueAxis.class.getDeclaredMethod("scalePropertyImpl");
	scalePropertyImplMethod.setAccessible(true);
	} catch (SecurityException \| NoSuchMethodException e) {
	throw new IllegalStateException(e);
	}
	}

	protected ReadOnlyDoubleWrapper scalePropertyImplProtected() {
	try {
	return (ReadOnlyDoubleWrapper) scalePropertyImplMethod.invoke(this);
	} catch (IllegalAccessException \| IllegalArgumentException \| InvocationTargetException e) {
	throw new IllegalStateException(e);
	}
	}

	}