/*
* Copyright (c) 1997, 1999, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
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*/
package java.awt.geom;
import java.util.*;
/**
* A utility class to iterate over the path segments of a line segment
* through the PathIterator interface.
*
* @author Jim Graham
*/
class
LineIterator implements
PathIterator {
Line2D line;
AffineTransform affine;
int
index;
LineIterator(
Line2D l,
AffineTransform at) {
this.
line =
l;
this.
affine =
at;
}
/**
* Return the winding rule for determining the insideness of the
* path.
* @see #WIND_EVEN_ODD
* @see #WIND_NON_ZERO
*/
public int
getWindingRule() {
return
WIND_NON_ZERO;
}
/**
* Tests if there are more points to read.
* @return true if there are more points to read
*/
public boolean
isDone() {
return (
index > 1);
}
/**
* Moves the iterator to the next segment of the path forwards
* along the primary direction of traversal as long as there are
* more points in that direction.
*/
public void
next() {
index++;
}
/**
* Returns the coordinates and type of the current path segment in
* the iteration.
* The return value is the path segment type:
* SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
* A float array of length 6 must be passed in and may be used to
* store the coordinates of the point(s).
* Each point is stored as a pair of float x,y coordinates.
* SEG_MOVETO and SEG_LINETO types will return one point,
* SEG_QUADTO will return two points,
* SEG_CUBICTO will return 3 points
* and SEG_CLOSE will not return any points.
* @see #SEG_MOVETO
* @see #SEG_LINETO
* @see #SEG_QUADTO
* @see #SEG_CUBICTO
* @see #SEG_CLOSE
*/
public int
currentSegment(float[]
coords) {
if (
isDone()) {
throw new
NoSuchElementException("line iterator out of bounds");
}
int
type;
if (
index == 0) {
coords[0] = (float)
line.
getX1();
coords[1] = (float)
line.
getY1();
type =
SEG_MOVETO;
} else {
coords[0] = (float)
line.
getX2();
coords[1] = (float)
line.
getY2();
type =
SEG_LINETO;
}
if (
affine != null) {
affine.
transform(
coords, 0,
coords, 0, 1);
}
return
type;
}
/**
* Returns the coordinates and type of the current path segment in
* the iteration.
* The return value is the path segment type:
* SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
* A double array of length 6 must be passed in and may be used to
* store the coordinates of the point(s).
* Each point is stored as a pair of double x,y coordinates.
* SEG_MOVETO and SEG_LINETO types will return one point,
* SEG_QUADTO will return two points,
* SEG_CUBICTO will return 3 points
* and SEG_CLOSE will not return any points.
* @see #SEG_MOVETO
* @see #SEG_LINETO
* @see #SEG_QUADTO
* @see #SEG_CUBICTO
* @see #SEG_CLOSE
*/
public int
currentSegment(double[]
coords) {
if (
isDone()) {
throw new
NoSuchElementException("line iterator out of bounds");
}
int
type;
if (
index == 0) {
coords[0] =
line.
getX1();
coords[1] =
line.
getY1();
type =
SEG_MOVETO;
} else {
coords[0] =
line.
getX2();
coords[1] =
line.
getY2();
type =
SEG_LINETO;
}
if (
affine != null) {
affine.
transform(
coords, 0,
coords, 0, 1);
}
return
type;
}
}