IsTransparentPixel Class Reference

Inheritance diagram for IsTransparentPixel:

Collaboration diagram for IsTransparentPixel:

Public Member Functions
String	getURI ()
Boolean	attribute (GridCoverage coverage, Integer noband, Integer x, Integer y)
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Member Function Documentation

attribute()

Boolean attribute	(	GridCoverage	coverage,
		Integer	noband,
		Integer	x,
		Integer	y
	)

Reimplemented from RasterAttributeIntIntIntBooleanFunction.

                                                                                              {
                int[] valuess=new int[coverage.getSampleDimensions().size()];
                int pixel;
                        pixel = coverage.render(null).getTile(x, y).getPixel(x, y, valuess)[noband];
                        if((pixel>>24) == 0x00 ) {
                              return true;
                        }
                return false;
        }

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

                                                                                                            {
                if (args.length != 3) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 4 arguments, got " + args.length);
                }
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof RasterLiteral) {
                        GridCoverage geom=((RasterLiteral)l).read(args[0].stringValue());
                        Integer noband = Integer.valueOf(args[1].stringValue());
                        Integer x = Integer.valueOf(args[2].stringValue());
                        Integer y = Integer.valueOf(args[2].stringValue());
                        Boolean result = attribute(geom,noband,x,y);
                        return valueFactory.createLiteral(result);
                }
                return null;
        }

References RasterAttributeIntIntIntBooleanFunction.attribute(), and LiteralRegistry.getLiteral().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_isTransparentPixel.stringValue();
        }

References POSTGIS.st_isTransparentPixel.