J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt.geom; |
| 27 | |
| 28 | final 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 | } |