org.freehep.swing
Class ColorConverter

java.lang.Object
  org.freehep.swing.ColorConverter

public class ColorConverter

extends Object

A utility class for converting strings to color's.

Version:

$Id: ColorConverter.java,v 1.2 2004/07/24 04:04:31 duns Exp $

Author:

Tony Johnson, M.Donszelmann

Source Code:

ColorConverter.java

Nested Class Summary

static class

ColorConverter.ColorConversionException An exception thrown if a given string cannot be converted to a Color

Constructor Summary

ColorConverter()
Creates an instance of ColorConverter with the default color conversions

Method Summary

void	addEntry(Color c, String name) Add an entry to the color converter map
void	clear() Clear all the mappings from the color converter
String	colorToString(Color color) Convert the given color to a string.
protected Color	createColor(float red, float green, float blue, float alpha) Return a color for the given values.
protected Color	createColor(int red, int green, int blue, int alpha) Return a color for the given values.
static String	get(Color color) Convert a color to a string, using the default ColorConverter
static Color	get(String name) Converts a string to a color, using the default ColorConverter
Color	stringToColor(String name) this method returns a Color.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColorConverter

public ColorConverter()

Creates an instance of ColorConverter with the default color conversions

Method Detail

get

public static String get(Color color)

Convert a color to a string, using the default ColorConverter

Parameters:

color - The color to convert

Returns:

The resulting String

get

public static Color get(String name)
                 throws ColorConverter.ColorConversionException

Converts a string to a color, using the default ColorConverter

Parameters:

name - The string to convert

Returns:

The resulting color

Throws:

ColorConverter.ColorConversionException - Thrown if the given string cannot be converted to a color

addEntry

public void addEntry(Color c,
                     String name)

Add an entry to the color converter map

Parameters:

c - The color to add

name - The name corresponding to the color

clear

public void clear()

Clear all the mappings from the color converter

colorToString

public String colorToString(Color color)

Convert the given color to a string.

Parameters:

color - The color to be converted

Returns:

Teh resulting string

stringToColor

public Color stringToColor(String name)
                    throws ColorConverter.ColorConversionException

this method returns a Color. Colors are supposedly immutable and are returned from the same table. The supported formats are:

      by name:          "yellow"                      , where alpha is always 1.0
      by int r,g,b,a:   "128, 255, 64, 255"           , where alpha (a) is optional
      by float r,g,b,a: "0.5, 1.0, 0.25, 1.0"         , where alpha (a) is optional
      by single number: "64637" or "0x0FFF08"         , where alpha is always 1.0
 

Parameters:

name - name/number of the color

Returns:

requested Color or defaulting to white in case of a invalid name (message is printed).

Throws:

ColorConverter.ColorConversionException - Thrown if the given string cannot be converted to a color

createColor

protected Color createColor(int red,
                            int green,
                            int blue,
                            int alpha)

Return a color for the given values. Subclasses may override this to tweak colors.

createColor

protected Color createColor(float red,
                            float green,
                            float blue,
                            float alpha)

Return a color for the given values. Subclasses may override this to tweak colors.