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