uk.ac.starlink.ttools.plot2.layer

Class GraphicsGlyph

java.lang.Object

uk.ac.starlink.ttools.plot2.layer.GraphicsGlyph

All Implemented Interfaces:

Glyph

public abstract class GraphicsGlyph
extends Object
implements Glyph

Glyph implementation whose Pixer is generated by drawing onto a bitmap. This provides an easy way to generate a Glyph, but the Pixer implementation is typically inefficient, since it needs first to paint to, and then to interrogate, a BufferedImage (GreyImage).

Since:

27 Jan 2021

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
GraphicsGlyph(Rectangle bounds) Constructs a GraphicsGlyph that may cover pixels within a given bounding rectangle.

Method Summary

Modifier and Type	Method and Description
Pixer	createPixer(Rectangle clip) Returns an iterator over pixel offsets for this glyph's shape, considered to be at the origin.

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.ac.starlink.ttools.plot2.Glyph

paintGlyph

Constructor Detail

GraphicsGlyph

public GraphicsGlyph(Rectangle bounds)

Constructs a GraphicsGlyph that may cover pixels within a given bounding rectangle. For reasons of efficiency, the extent of this rectangle should be kept as small as possible based on knowledge of the size of the output painting and the eventual visible region.

Parameters:

bounds - maximum extent of the image that this glyph covers

Method Detail

createPixer

public Pixer createPixer(Rectangle clip)

Description copied from interface: Glyph

Returns an iterator over pixel offsets for this glyph's shape, considered to be at the origin. Typically this means the pixel collection is centred at that point. The returned iterator must not include any points outside of the given clip rectangle. A null return indicates that no pixels fall within the given clip.

Specified by:

createPixer in interface Glyph

Parameters:

clip - clip rectangle

Returns:

pixel iterator for the intersection of this glyph's shape and the given clip, or null for no pixels