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ObjectJGrassColorTable
public class JGrassColorTable
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:
value1:r:g:b value2:r:g:b
interpolation of colors between
the two values with the two colorsvalue1:grey value2:grey
value1:r:g:b
assumption that it means that value1 ==
value2nv:r:g:b
novalues could also have color with such a rule.
Constructor Summary | |
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JGrassColorTable(JGrassMapEnvironment readerGrassEnv,
double[] dataRange)
Creates a new instance of ColorTable |
Method Summary | |
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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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public JGrassColorTable(JGrassMapEnvironment readerGrassEnv, double[] dataRange) throws IOException
readerGrassEnv
- the grass environment used to identify paths.dataRange
- the datarange to be used if the native one is missing.
IOException
Method Detail |
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public static List<String> createDefaultColorTable(double[] dataRange, int alpha)
dataRange
- the data range for which the color table is created
value1:r:g:b value2:r:g:b alpha
public List<String> getColorRules()
public int getAlpha()
public static void parseColorRule(String rule, double[] values, Color[] colors)
Arrays of doubles and colors have to be passed, that will be filled with the values of the color rule.
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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