Package org.apache.sis.internal.feature.j2d

Class DecimatedPathIterator

java.lang.Object

org.apache.sis.internal.feature.j2d.DecimatedPathIterator

All Implemented Interfaces:

PathIterator

final class DecimatedPathIterator
extends Object
implements PathIterator

A path iterator with applies on-the-fly decimation for faster drawing. The decimation algorithm is based on a simple distance calculation on each axis (this is not a Douglas-Peucker algorithm).

Since:

1.2

Version:

1.2

Field Summary

Fields

Modifier and Type	Field	Description
private double	px	Previous coordinates, or NaN if none.
private double	py	Previous coordinates, or NaN if none.
private final PathIterator	source	The source of line segments.
private final double	xRes	The desired resolution on each axis.
private final double	yRes	The desired resolution on each axis.

Fields inherited from interface java.awt.geom.PathIterator

SEG_CLOSE, SEG_CUBICTO, SEG_LINETO, SEG_MOVETO, SEG_QUADTO, WIND_EVEN_ODD, WIND_NON_ZERO

Constructor Summary

Constructors

Constructor	Description
DecimatedPathIterator(PathIterator source, double xRes, double yRes)	Creates a new iterator.

Method Summary

Modifier and Type	Method	Description
int	currentSegment(double[] coords)	Returns the coordinates and type of the current path segment in the iteration.
int	currentSegment(float[] coords)	Returns the coordinates and type of the current path segment in the iteration.
int	getWindingRule()	Returns the winding rule for determining the interior of the path.
private boolean	include(double x, double y)	Returns whether the given point should be returned in a PathIterator.SEG_LINETO segment.
boolean	isDone()	Returns true if iteration is finished.
void	next()	Moves the iterator to the next segment.

Methods inherited from class java.lang.Object

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

Field Details

source

private final PathIterator source

The source of line segments.

xRes

private final double xRes

The desired resolution on each axis.

yRes

private final double yRes

The desired resolution on each axis.

px

private double px

Previous coordinates, or NaN if none.

py

private double py

Previous coordinates, or NaN if none.

Constructor Details

DecimatedPathIterator

DecimatedPathIterator(PathIterator source,
 double xRes,
 double yRes)

Creates a new iterator.

Method Details

next

public void next()

Moves the iterator to the next segment.

Specified by:

next in interface PathIterator

isDone

public boolean isDone()

Returns true if iteration is finished.

Specified by:

isDone in interface PathIterator

getWindingRule

public int getWindingRule()

Returns the winding rule for determining the interior of the path.

Specified by:

getWindingRule in interface PathIterator

currentSegment

public int currentSegment(double[] coords)

Returns the coordinates and type of the current path segment in the iteration. This method has a fallback for quadratic and cubic curves, but this fallback is not very good. This iterator should be used for flat shapes only.

Specified by:

currentSegment in interface PathIterator

Parameters:

coords - an array where to store the data returned from this method.

Returns:

the path-segment type of the current path segment.

currentSegment

public int currentSegment(float[] coords)

Returns the coordinates and type of the current path segment in the iteration. This is a copy of currentSegment(double[]) with only the type changed.

Specified by:

currentSegment in interface PathIterator

Parameters:

coords - an array where to store the data returned from this method.

Returns:

the path-segment type of the current path segment.

include

private boolean include(double x,
 double y)

Returns whether the given point should be returned in a PathIterator.SEG_LINETO segment.