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	/*
	* Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.awt.geom;

	final class CurveLink {
	Curve curve;
	double ytop;
	double ybot;
	int etag;

	CurveLink next;

	public CurveLink(Curve curve, double ystart, double yend, int etag) {
	this.curve = curve;
	this.ytop = ystart;
	this.ybot = yend;
	this.etag = etag;
	if (ytop < curve.getYTop() \|\| ybot > curve.getYBot()) {
	throw new InternalError("bad curvelink ["+ytop+"=>"+ybot+"] for "+curve);
	}
	}

	public boolean absorb(CurveLink link) {
	return absorb(link.curve, link.ytop, link.ybot, link.etag);
	}

	public boolean absorb(Curve curve, double ystart, double yend, int etag) {
	if (this.curve != curve \|\| this.etag != etag \|\|
	ybot < ystart \|\| ytop > yend)
	{
	return false;
	}
	if (ystart < curve.getYTop() \|\| yend > curve.getYBot()) {
	throw new InternalError("bad curvelink ["+ystart+"=>"+yend+"] for "+curve);
	}
	this.ytop = Math.min(ytop, ystart);
	this.ybot = Math.max(ybot, yend);
	return true;
	}

	public boolean isEmpty() {
	return (ytop == ybot);
	}

	public Curve getCurve() {
	return curve;
	}

	public Curve getSubCurve() {
	if (ytop == curve.getYTop() && ybot == curve.getYBot()) {
	return curve.getWithDirection(etag);
	}
	return curve.getSubCurve(ytop, ybot, etag);
	}

	public Curve getMoveto() {
	return new Order0(getXTop(), getYTop());
	}

	public double getXTop() {
	return curve.XforY(ytop);
	}

	public double getYTop() {
	return ytop;
	}

	public double getXBot() {
	return curve.XforY(ybot);
	}

	public double getYBot() {
	return ybot;
	}

	public double getX() {
	return curve.XforY(ytop);
	}

	public int getEdgeTag() {
	return etag;
	}

	public void setNext(CurveLink link) {
	this.next = link;
	}

	public CurveLink getNext() {
	return next;
	}
	}

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