org.geotools.gce.grassraster.core.color
Class JGrassColorTable

Object
  extended by JGrassColorTable

public class JGrassColorTable
extends Object

Represents a GRASS rastermap color table.

Colortables for GRASS 5 and greater are supported.

Format of the color file, which is located in location/mapset/colr/mapname:

The first line is a % character and two numbers indicating the minimum and maximum data values which have colors. Note that in JGrass after the range values we add a third value for alpha support.

After the first line, the list of color rules appears, that can be of the following formats:

Since:
3.0
Author:
Andrea Antonello (www.hydrologis.com)

Constructor Summary
JGrassColorTable(JGrassMapEnvironment readerGrassEnv, double[] dataRange)
          Creates a new instance of ColorTable
 
Method Summary
static List<String> createDefaultColorTable(double[] dataRange, int alpha)
          Creates a default rainbow color table given a data range.
 int getAlpha()
          Getter for the alpha value.
 List<String> getColorRules()
          Getter for the color rules.
static void parseColorRule(String rule, double[] values, Color[] colors)
          parses a color rule.
 
Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

JGrassColorTable

public JGrassColorTable(JGrassMapEnvironment readerGrassEnv,
                        double[] dataRange)
                 throws IOException
Creates a new instance of ColorTable

Parameters:
readerGrassEnv - the grass environment used to identify paths.
dataRange - the datarange to be used if the native one is missing.
Throws:
IOException
Method Detail

createDefaultColorTable

public static List<String> createDefaultColorTable(double[] dataRange,
                                                   int alpha)
Creates a default rainbow color table given a data range.

Parameters:
dataRange - the data range for which the color table is created
Returns:
the list of color rules as value1:r:g:b value2:r:g:b alpha

getColorRules

public List<String> getColorRules()
Getter for the color rules.

Returns:
the list of color rules.

getAlpha

public int getAlpha()
Getter for the alpha value.

Returns:
the alpha value.

parseColorRule

public static void parseColorRule(String rule,
                                  double[] values,
                                  Color[] colors)
parses a color rule.

Arrays of doubles and colors have to be passed, that will be filled with the values of the color rule.

Parameters:
rule - the color rule as taken from the list returned by getColorRules()
values - the array of doubles to be filled with the values.
colors - the array of Color to be filled with the colors (can be null).


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