Package uk.ac.rdg.resc.edal.graphics.style

Class OpacityTransform

java.lang.Object

uk.ac.rdg.resc.edal.graphics.style.Drawable

uk.ac.rdg.resc.edal.graphics.style.ImageLayer

uk.ac.rdg.resc.edal.graphics.style.GriddedImageLayer

uk.ac.rdg.resc.edal.graphics.style.OpacityTransform

Direct Known Subclasses:

FlatOpacity, OpacityMap

public abstract class OpacityTransform
extends GriddedImageLayer

Nested Class Summary

Nested classes/interfaces inherited from class uk.ac.rdg.resc.edal.graphics.style.GriddedImageLayer

GriddedImageLayer.MapFeatureDataReader

Nested classes/interfaces inherited from class uk.ac.rdg.resc.edal.graphics.style.ImageLayer

ImageLayer.MetadataFilter

Nested classes/interfaces inherited from class uk.ac.rdg.resc.edal.graphics.style.Drawable

Drawable.NameAndRange

Constructor Summary

Constructors

Constructor	Description
OpacityTransform()

Method Summary

Modifier and Type	Method	Description
protected abstract void	applyOpacityToImage(BufferedImage image, GriddedImageLayer.MapFeatureDataReader dataReader)
protected int	blendPixel(int original, int alpha)	Applies an alpha value to a pixel.
protected void	drawIntoImage(BufferedImage image, GriddedImageLayer.MapFeatureDataReader dataReader)	Draws the data into the supplied image.

Methods inherited from class uk.ac.rdg.resc.edal.graphics.style.GriddedImageLayer

drawIntoImage, supportedFeatureTypes

Methods inherited from class uk.ac.rdg.resc.edal.graphics.style.ImageLayer

drawImage, getMetadataFilter

Methods inherited from class uk.ac.rdg.resc.edal.graphics.style.Drawable

getFieldsWithScales, getOpacityTransform, setOpacityTransform

Methods inherited from class java.lang.Object

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

Constructor Detail

OpacityTransform

public OpacityTransform()

Method Detail

applyOpacityToImage

protected abstract void applyOpacityToImage(BufferedImage image,
                                            GriddedImageLayer.MapFeatureDataReader dataReader)
                                     throws EdalException

Throws:

EdalException

drawIntoImage

protected final void drawIntoImage(BufferedImage image,
                                   GriddedImageLayer.MapFeatureDataReader dataReader)
                            throws EdalException

Description copied from class: GriddedImageLayer

Draws the data into the supplied image.

Specified by:

drawIntoImage in class GriddedImageLayer

Parameters:

image - A BufferedImage to draw into

dataReader - A GriddedImageLayer.MapFeatureDataReader which is used to obtain the actual data values and domain. The MapDomain returned will match the size of the image, and pixels are georeferenced to the GridCell2Ds which comprise the domain

Throws:

EdalException - If there is a problem reading the data or drawing into the image

blendPixel

protected int blendPixel(int original,
                         int alpha)

Applies an alpha value to a pixel.

Parameters:

original - The original pixel value

alpha - An alpha value (0-255)

Returns:

The alpha-blended pixel