1/* 2 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package sun.awt.geom; 27 28final class CurveLink { 29 Curve curve; 30 double ytop; 31 double ybot; 32 int etag; 33 34 CurveLink next; 35 36 public CurveLink(Curve curve, double ystart, double yend, int etag) { 37 this.curve = curve; 38 this.ytop = ystart; 39 this.ybot = yend; 40 this.etag = etag; 41 if (ytop < curve.getYTop() || ybot > curve.getYBot()) { 42 throw new InternalError("bad curvelink ["+ytop+"=>"+ybot+"] for "+curve); 43 } 44 } 45 46 public boolean absorb(CurveLink link) { 47 return absorb(link.curve, link.ytop, link.ybot, link.etag); 48 } 49 50 public boolean absorb(Curve curve, double ystart, double yend, int etag) { 51 if (this.curve != curve || this.etag != etag || 52 ybot < ystart || ytop > yend) 53 { 54 return false; 55 } 56 if (ystart < curve.getYTop() || yend > curve.getYBot()) { 57 throw new InternalError("bad curvelink ["+ystart+"=>"+yend+"] for "+curve); 58 } 59 this.ytop = Math.min(ytop, ystart); 60 this.ybot = Math.max(ybot, yend); 61 return true; 62 } 63 64 public boolean isEmpty() { 65 return (ytop == ybot); 66 } 67 68 public Curve getCurve() { 69 return curve; 70 } 71 72 public Curve getSubCurve() { 73 if (ytop == curve.getYTop() && ybot == curve.getYBot()) { 74 return curve.getWithDirection(etag); 75 } 76 return curve.getSubCurve(ytop, ybot, etag); 77 } 78 79 public Curve getMoveto() { 80 return new Order0(getXTop(), getYTop()); 81 } 82 83 public double getXTop() { 84 return curve.XforY(ytop); 85 } 86 87 public double getYTop() { 88 return ytop; 89 } 90 91 public double getXBot() { 92 return curve.XforY(ybot); 93 } 94 95 public double getYBot() { 96 return ybot; 97 } 98 99 public double getX() { 100 return curve.XforY(ytop); 101 } 102 103 public int getEdgeTag() { 104 return etag; 105 } 106 107 public void setNext(CurveLink link) { 108 this.next = link; 109 } 110 111 public CurveLink getNext() { 112 return next; 113 } 114} 115