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QuadIterator.java
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/*
* Copyright (c) 1997, 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 quadratic curve
* segment through the PathIterator interface.
*
* @author Jim Graham
*/
class QuadIterator implements PathIterator {
QuadCurve2D quad;
AffineTransform affine;
int index;
QuadIterator(QuadCurve2D q, AffineTransform at) {
this.quad = q;
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("quad iterator iterator out of bounds");
}
int type;
if (index == 0) {
coords[0] = (float) quad.getX1();
coords[1] = (float) quad.getY1();
type = SEG_MOVETO;
} else {
coords[0] = (float) quad.getCtrlX();
coords[1] = (float) quad.getCtrlY();
coords[2] = (float) quad.getX2();
coords[3] = (float) quad.getY2();
type = SEG_QUADTO;
}
if (affine != null) {
affine.transform(coords, 0, coords, 0, index == 0 ? 1 : 2);
}
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("quad iterator iterator out of bounds");
}
int type;
if (index == 0) {
coords[0] = quad.getX1();
coords[1] = quad.getY1();
type = SEG_MOVETO;
} else {
coords[0] = quad.getCtrlX();
coords[1] = quad.getCtrlY();
coords[2] = quad.getX2();
coords[3] = quad.getY2();
type = SEG_QUADTO;
}
if (affine != null) {
affine.transform(coords, 0, coords, 0, index == 0 ? 1 : 2);
}
return type;
}
}