org.eclipse.scada.chart.swt

Class Helper

java.lang.Object

org.eclipse.scada.chart.swt.Helper

public class Helper
extends Object

This is a helper class implementing the "nice axis number" according to Paul S. Heckbert and Edward Tufte. Also see Graphics gems, Page 61 and The visual display of quantitative information.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Helper.Entry<T>

Constructor Summary

Constructors

Constructor and Description
Helper()

Method Summary

Modifier and Type	Method and Description
static List<Helper.Entry<Long>>	chartTimes(long min, long max, int pixels, int labelWidth, DateFormat format)
static List<Helper.Entry<Double>>	chartValues(double min, double max, int pixels, int labelHeight)
static DateFormat	makeFormat(long range)
static double	niceNum(double value, boolean round)
static long	niceTimeRounded(long value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Helper

public Helper()

Method Detail

niceNum

public static double niceNum(double value,
                             boolean round)

chartValues

public static List<Helper.Entry<Double>> chartValues(double min,
                                                     double max,
                                                     int pixels,
                                                     int labelHeight)

niceTimeRounded

public static long niceTimeRounded(long value)

chartTimes

public static List<Helper.Entry<Long>> chartTimes(long min,
                                                  long max,
                                                  int pixels,
                                                  int labelWidth,
                                                  DateFormat format)

makeFormat

public static DateFormat makeFormat(long range)