Package org.geotools.renderer.lite

Class RenderingTransformationHelper

Object

RenderingTransformationHelper

public abstract class RenderingTransformationHelper
extends Object

Helper class that transforms the input data via rendering transformations. Rolled out so that it can be shared among StreamingRenderer and grid coverage direct rendering to RenderedImage

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	oversample	If true, the transformation will read the coverage at a higher resolution than the native one, and then scale it down to the desired resolution.
static int	TRANSFORM_READ_BUFFER_PIXELS

Constructor Summary

Constructors

Constructor	Description
RenderingTransformationHelper()

Method Summary

Modifier and Type	Method	Description
Object	applyRenderingTransformation(Expression transformation, FeatureSource featureSource, Query layerQuery, Query renderingQuery, GridGeometry2D gridGeometry, CoordinateReferenceSystem sourceCrs, RenderingHints hints)
protected abstract GridCoverage2D	readCoverage(GridCoverage2DReader reader, Object params, GridGeometry2D readGG)	Subclasses will override and provide means to read the coverage
void	setOversampleEnabled(boolean oversample)

Methods inherited from class Object

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

Field Detail

TRANSFORM_READ_BUFFER_PIXELS

public static final int TRANSFORM_READ_BUFFER_PIXELS

See Also:

Constant Field Values

oversample

protected boolean oversample

If true, the transformation will read the coverage at a higher resolution than the native one, and then scale it down to the desired resolution. This is useful when the transformation can benefit from receiving interpolated data, as it will have more data to interpolate from. If false, the transformation will read the coverage at the native resolution, and then scale it up to the desired resolution.

Constructor Detail

RenderingTransformationHelper

public RenderingTransformationHelper()

Method Detail

applyRenderingTransformation

public Object applyRenderingTransformation(Expression transformation,
                                           FeatureSource featureSource,
                                           Query layerQuery,
                                           Query renderingQuery,
                                           GridGeometry2D gridGeometry,
                                           CoordinateReferenceSystem sourceCrs,
                                           RenderingHints hints)
                                    throws IOException,
                                           SchemaException,
                                           TransformException,
                                           FactoryException

Throws:

IOException

SchemaException

TransformException

FactoryException

readCoverage

protected abstract GridCoverage2D readCoverage(GridCoverage2DReader reader,
                                               Object params,
                                               GridGeometry2D readGG)
                                        throws IOException

Subclasses will override and provide means to read the coverage

Throws:

IOException

setOversampleEnabled

public void setOversampleEnabled(boolean oversample)