Package org.geotools.renderer.lite.gridcoverage2d

Class GridCoverageRenderer

Object

GridCoverageRenderer

public final class GridCoverageRenderer
extends Object

A helper class for rendering GridCoverage objects.

Author:

Simone Giannecchini, GeoSolutions SAS, Andrea Aime, GeoSolutions SAS, Alessio Fabiani, GeoSolutions SAS

Field Summary

Fields

Modifier and Type	Field	Description
static final String	KEY_COMPOSITING
static final Hints.Key	PADDING	Hint's KEY specifying a custom padding
static final String	PARENT_COVERAGE_PROPERTY

Constructor Summary

Constructors

Constructor	Description
GridCoverageRenderer(CoordinateReferenceSystem destinationCRS, Envelope envelope, Rectangle screenSize, AffineTransform worldToScreen)	Creates a new GridCoverageRenderer object.
GridCoverageRenderer(CoordinateReferenceSystem destinationCRS, Envelope envelope, Rectangle screenSize, AffineTransform worldToScreen, RenderingHints newHints)	Creates a new GridCoverageRenderer object.

Method Summary

Modifier and Type	Method	Description
boolean	isAdvancedProjectionHandlingEnabled()	Tests if advanced projection handling is enabled (read all areas needed to make up the requested map, cut them to areas where reprojection makes sense, and so on).
static boolean	isBandsSelectionApplicable(GridCoverageReader reader, RasterSymbolizer symbolizer)	Checks if band selection is present, and can be delegated down to the reader
boolean	isOversample()
boolean	isWrapEnabled()	Returns true if map wrapping is enabled (active only when rendering off a GridCoverage2DReader and when advanced projection handling has been enabled too)
void	paint(Graphics2D graphics, GridCoverage2D gridCoverage, RasterSymbolizer symbolizer)	Paint this grid coverage.
void	paint(Graphics2D graphics, GridCoverage2D gridCoverage, RasterSymbolizer symbolizer, double[] bkgValues)	Paint this grid coverage.
void	paint(Graphics2D graphics, GridCoverage2DReader gridCoverageReader, GeneralParameterValue[] readParams, RasterSymbolizer symbolizer, Interpolation interpolation, Color background)	Paint the coverage read from the reader (using advanced projection handling).
RenderedImage	renderImage(GridCoverage2D gridCoverage, RasterSymbolizer symbolizer, double[] bkgValues)	Turns the coverage into a rendered image applying the necessary transformations and the symbolizer
RenderedImage	renderImage(GridCoverage2D gridCoverage, RasterSymbolizer symbolizer, Interpolation interpolation, Color background, int tileSizeX, int tileSizeY)	Turns the coverage into a rendered image applying the necessary transformations and the symbolizer
RenderedImage	renderImage(GridCoverage2DReader reader, GeneralParameterValue[] readParams, RasterSymbolizer symbolizer, Interpolation interpolation, Color background, int tileSizeX, int tileSizeY)
void	setAdvancedProjectionHandlingEnabled(boolean enabled)	Enables/disables advanced projection handling (read all areas needed to make up the requested map, cut them to areas where reprojection makes sense, and so on).
void	setOversample(boolean oversample)
static RasterSymbolizer	setupSymbolizerForBandsSelection(RasterSymbolizer symbolizer)	Takes into account that the band selection has been delegated down to the reader by producing a new channel selection
void	setWrapEnabled(boolean wrapEnabled)	Enables/disable map wrapping (active only when rendering off a GridCoverage2DReader and when advanced projection handling has been enabled too)

Methods inherited from class Object

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

Field Details

PARENT_COVERAGE_PROPERTY

public static final String PARENT_COVERAGE_PROPERTY

See Also:

• Constant Field Values

PADDING

public static final Hints.Key PADDING

Hint's KEY specifying a custom padding

KEY_COMPOSITING

public static final String KEY_COMPOSITING

See Also:

• Constant Field Values

Constructor Details

GridCoverageRenderer

public GridCoverageRenderer(CoordinateReferenceSystem destinationCRS,
 Envelope envelope,
 Rectangle screenSize,
 AffineTransform worldToScreen)
                     throws TransformException,
NoninvertibleTransformException

Creates a new GridCoverageRenderer object.

Parameters:

destinationCRS - the CRS of the GridCoverage2D to render.

envelope - delineating the area to be rendered.

screenSize - at which we want to render the source GridCoverage2D.

worldToScreen - if not null and if it contains a rotation, this Affine Transform is used directly to convert from world coordinates to screen coordinates. Otherwise, a standard GridToEnvelopeMapper is used to calculate the affine transform.

Throws:

TransformException

NoninvertibleTransformException

GridCoverageRenderer

public GridCoverageRenderer(CoordinateReferenceSystem destinationCRS,
 Envelope envelope,
 Rectangle screenSize,
 AffineTransform worldToScreen,
 RenderingHints newHints)
                     throws TransformException,
NoninvertibleTransformException

Creates a new GridCoverageRenderer object.

Parameters:

destinationCRS - the CRS of the GridCoverage2D to render.

envelope - delineating the area to be rendered.

screenSize - at which we want to render the source GridCoverage2D.

worldToScreen - if not null and if it contains a rotation, this Affine Transform is used directly to convert from world coordinates to screen coordinates. Otherwise, a standard GridToEnvelopeMapper is used to calculate the affine transform.

newHints - RenderingHints to control this rendering process.

Throws:

TransformException

NoninvertibleTransformException

Method Details

isOversample

public boolean isOversample()

setOversample

public void setOversample(boolean oversample)

setWrapEnabled

public void setWrapEnabled(boolean wrapEnabled)

Enables/disable map wrapping (active only when rendering off a GridCoverage2DReader and when advanced projection handling has been enabled too)

isWrapEnabled

public boolean isWrapEnabled()

Returns true if map wrapping is enabled (active only when rendering off a GridCoverage2DReader and when advanced projection handling has been enabled too)

setAdvancedProjectionHandlingEnabled

public void setAdvancedProjectionHandlingEnabled(boolean enabled)

Enables/disables advanced projection handling (read all areas needed to make up the requested map, cut them to areas where reprojection makes sense, and so on). Works only when rendering off a GridCoverage2DReader.

isAdvancedProjectionHandlingEnabled

public boolean isAdvancedProjectionHandlingEnabled()

Tests if advanced projection handling is enabled (read all areas needed to make up the requested map, cut them to areas where reprojection makes sense, and so on). Works only when rendering off a GridCoverage2DReader.

renderImage

public RenderedImage renderImage(GridCoverage2D gridCoverage,
 RasterSymbolizer symbolizer,
 double[] bkgValues)
                          throws Exception

Turns the coverage into a rendered image applying the necessary transformations and the symbolizer

Builds a (RenderedImage, AffineTransform) pair that can be used for rendering onto a Graphics2D or as the basis to build a final image. Will return null if there is nothing to render.

Returns:

The transformed image, or null if the coverage does not lie within the rendering bounds

Throws:

Exception

renderImage

public RenderedImage renderImage(GridCoverage2D gridCoverage,
 RasterSymbolizer symbolizer,
 Interpolation interpolation,
 Color background,
 int tileSizeX,
 int tileSizeY)
                          throws FactoryException,
TransformException,
NoninvertibleTransformException

Turns the coverage into a rendered image applying the necessary transformations and the symbolizer

Returns:

The transformed image, or null if the coverage does not lie within the rendering bounds

Throws:

FactoryException

TransformException

NoninvertibleTransformException

renderImage

public RenderedImage renderImage(GridCoverage2DReader reader,
 GeneralParameterValue[] readParams,
 RasterSymbolizer symbolizer,
 Interpolation interpolation,
 Color background,
 int tileSizeX,
 int tileSizeY)
                          throws FactoryException,
TransformException,
NoninvertibleTransformException,
IOException

Throws:

FactoryException

TransformException

NoninvertibleTransformException

IOException

paint

public void paint(Graphics2D graphics,
 GridCoverage2D gridCoverage,
 RasterSymbolizer symbolizer)
           throws Exception

Paint this grid coverage. The caller must ensure that graphics has an affine transform mapping "real world" coordinates in the coordinate system given by

Parameters:

graphics - the Graphics2D context in which to paint.

Throws:

UnsupportedOperationException - if the transformation from grid to coordinate system in the GridCoverage is not an AffineTransform

Exception

paint

public void paint(Graphics2D graphics,
 GridCoverage2D gridCoverage,
 RasterSymbolizer symbolizer,
 double[] bkgValues)
           throws Exception

Paint this grid coverage. The caller must ensure that graphics has an affine transform mapping "real world" coordinates in the coordinate system given by #getCoordinateSystem.

Parameters:

graphics - the Graphics2D context in which to paint.

Throws:

UnsupportedOperationException - if the transformation from grid to coordinate system in the GridCoverage is not an AffineTransform

Exception

paint

public void paint(Graphics2D graphics,
 GridCoverage2DReader gridCoverageReader,
 GeneralParameterValue[] readParams,
 RasterSymbolizer symbolizer,
 Interpolation interpolation,
 Color background)
           throws Exception

Paint the coverage read from the reader (using advanced projection handling). The caller must ensure that graphics has an affine transform mapping "real world" coordinates in the coordinate system given by #getCoordinateSystem.

Parameters:

graphics - the Graphics2D context in which to paint.

Throws:

UnsupportedOperationException - if the transformation from grid to coordinate system in the GridCoverage is not an AffineTransform

Exception

setupSymbolizerForBandsSelection

public static RasterSymbolizer setupSymbolizerForBandsSelection(RasterSymbolizer symbolizer)

Takes into account that the band selection has been delegated down to the reader by producing a new channel selection

isBandsSelectionApplicable

public static boolean isBandsSelectionApplicable(GridCoverageReader reader,
 RasterSymbolizer symbolizer)

Checks if band selection is present, and can be delegated down to the reader