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