| /* |
| * 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 ChainEnd { |
| CurveLink head; |
| CurveLink tail; |
| ChainEnd partner; |
| int etag; |
| |
| public ChainEnd(CurveLink first, ChainEnd partner) { |
| this.head = first; |
| this.tail = first; |
| this.partner = partner; |
| this.etag = first.getEdgeTag(); |
| } |
| |
| public CurveLink getChain() { |
| return head; |
| } |
| |
| public void setOtherEnd(ChainEnd partner) { |
| this.partner = partner; |
| } |
| |
| public ChainEnd getPartner() { |
| return partner; |
| } |
| |
| /* |
| * Returns head of a complete chain to be added to subcurves |
| * or null if the links did not complete such a chain. |
| */ |
| public CurveLink linkTo(ChainEnd that) { |
| if (etag == AreaOp.ETAG_IGNORE || |
| that.etag == AreaOp.ETAG_IGNORE) |
| { |
| throw new InternalError("ChainEnd linked more than once!"); |
| } |
| if (etag == that.etag) { |
| throw new InternalError("Linking chains of the same type!"); |
| } |
| ChainEnd enter, exit; |
| // assert(partner.etag != that.partner.etag); |
| if (etag == AreaOp.ETAG_ENTER) { |
| enter = this; |
| exit = that; |
| } else { |
| enter = that; |
| exit = this; |
| } |
| // Now make sure these ChainEnds are not linked to any others... |
| etag = AreaOp.ETAG_IGNORE; |
| that.etag = AreaOp.ETAG_IGNORE; |
| // Now link everything up... |
| enter.tail.setNext(exit.head); |
| enter.tail = exit.tail; |
| if (partner == that) { |
| // Curve has closed on itself... |
| return enter.head; |
| } |
| // Link this chain into one end of the chain formed by the partners |
| ChainEnd otherenter = exit.partner; |
| ChainEnd otherexit = enter.partner; |
| otherenter.partner = otherexit; |
| otherexit.partner = otherenter; |
| if (enter.head.getYTop() < otherenter.head.getYTop()) { |
| enter.tail.setNext(otherenter.head); |
| otherenter.head = enter.head; |
| } else { |
| otherexit.tail.setNext(enter.head); |
| otherexit.tail = enter.tail; |
| } |
| return null; |
| } |
| |
| public void addLink(CurveLink newlink) { |
| if (etag == AreaOp.ETAG_ENTER) { |
| tail.setNext(newlink); |
| tail = newlink; |
| } else { |
| newlink.setNext(head); |
| head = newlink; |
| } |
| } |
| |
| public double getX() { |
| if (etag == AreaOp.ETAG_ENTER) { |
| return tail.getXBot(); |
| } else { |
| return head.getXBot(); |
| } |
| } |
| } |