lecho.lib.hellocharts.util

Class FloatUtils

java.lang.Object

lecho.lib.hellocharts.util.FloatUtils

public class FloatUtils
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int[]	POW10

Constructor Summary

Constructors

Constructor and Description
FloatUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	almostEqual(float a, float b, float absoluteDiff, float relativeDiff) Method checks if two float numbers are similar.
static void	computeAutoGeneratedAxisValues(float start, float stop, int steps, AxisAutoValues outValues) Computes the set of axis labels to show given start and stop boundaries and an ideal number of stops between these boundaries.
static int	formatFloat(char[] formattedValue, float value, int endIndex, int digits, char separator) Formats a float value to the given number of decimals.
static double	nextDown(double d) Returns next smaller float value considering precision of the argument.
static float	nextDownF(float f) Returns next smaller float value considering precision of the argument.
static double	nextUp(double d) Returns next bigger double value considering precision of the argument.
static float	nextUpF(float f) Returns next bigger float value considering precision of the argument.
static float	roundToOneSignificantFigure(double num) Rounds the given number to the given number of significant digits.

Methods inherited from class java.lang.Object

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

Field Detail

POW10

public static final int[] POW10

Constructor Detail

FloatUtils

public FloatUtils()

Method Detail

nextUpF

public static float nextUpF(float f)

Returns next bigger float value considering precision of the argument.

nextDownF

public static float nextDownF(float f)

Returns next smaller float value considering precision of the argument.

nextUp

public static double nextUp(double d)

Returns next bigger double value considering precision of the argument.

nextDown

public static double nextDown(double d)

Returns next smaller float value considering precision of the argument.

almostEqual

public static boolean almostEqual(float a,
                                  float b,
                                  float absoluteDiff,
                                  float relativeDiff)

Method checks if two float numbers are similar.

roundToOneSignificantFigure

public static float roundToOneSignificantFigure(double num)

Rounds the given number to the given number of significant digits. Based on an answer on Stack Overflow.

formatFloat

public static int formatFloat(char[] formattedValue,
                              float value,
                              int endIndex,
                              int digits,
                              char separator)

Formats a float value to the given number of decimals. Returns the length of the string. The string begins at [endIndex] - [return value] and ends at [endIndex]. It's up to you to check indexes correctness. Parameter [endIndex] can be helpful when you want to append some text to formatted value.

Returns:

number of characters of formatted value

computeAutoGeneratedAxisValues

public static void computeAutoGeneratedAxisValues(float start,
                                                  float stop,
                                                  int steps,
                                                  AxisAutoValues outValues)

Computes the set of axis labels to show given start and stop boundaries and an ideal number of stops between these boundaries.

Parameters:

start - The minimum extreme (e.g. the left edge) for the axis.

stop - The maximum extreme (e.g. the right edge) for the axis.

steps - The ideal number of stops to create. This should be based on available screen space; the more space there is, the more stops should be shown.

outValues - The destination AxisAutoValues object to populate.