1 /*
   2  * Copyright (c) 1998, 2018, 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 
  26 package sun.awt.geom;
  27 
  28 final class Edge {
  29     static final int INIT_PARTS = 4;
  30     static final int GROW_PARTS = 10;
  31 
  32     Curve curve;
  33     int ctag;
  34     int etag;
  35     double activey;
  36     int equivalence;
  37 
  38     public Edge(Curve c, int ctag) {
  39         this(c, ctag, AreaOp.ETAG_IGNORE);
  40     }
  41 
  42     public Edge(Curve c, int ctag, int etag) {
  43         this.curve = c;
  44         this.ctag = ctag;
  45         this.etag = etag;
  46     }
  47 
  48     public Curve getCurve() {
  49         return curve;
  50     }
  51 
  52     public int getCurveTag() {
  53         return ctag;
  54     }
  55 
  56     public int getEdgeTag() {
  57         return etag;
  58     }
  59 
  60     public void setEdgeTag(int etag) {
  61         this.etag = etag;
  62     }
  63 
  64     public int getEquivalence() {
  65         return equivalence;
  66     }
  67 
  68     public void setEquivalence(int eq) {
  69         equivalence = eq;
  70     }
  71 
  72     private Edge lastEdge;
  73     private int lastResult;
  74     private double lastLimit;
  75 
  76     public int compareTo(Edge other, double[] yrange) {
  77         if (other == lastEdge && yrange[0] < lastLimit) {
  78             if (yrange[1] > lastLimit) {
  79                 yrange[1] = lastLimit;
  80             }
  81             return lastResult;
  82         }
  83         if (this == other.lastEdge && yrange[0] < other.lastLimit) {
  84             if (yrange[1] > other.lastLimit) {
  85                 yrange[1] = other.lastLimit;
  86             }
  87             return 0-other.lastResult;
  88         }
  89         //long start = System.currentTimeMillis();
  90         int ret = curve.compareTo(other.curve, yrange);
  91         //long end = System.currentTimeMillis();
  92         /*
  93         System.out.println("compare: "+
  94                            ((System.identityHashCode(this) <
  95                              System.identityHashCode(other))
  96                             ? this+" to "+other
  97                             : other+" to "+this)+
  98                            " == "+ret+" at "+yrange[1]+
  99                            " in "+(end-start)+"ms");
 100          */
 101         lastEdge = other;
 102         lastLimit = yrange[1];
 103         lastResult = ret;
 104         return ret;
 105     }
 106 
 107     public void record(double yend, int etag) {
 108         this.activey = yend;
 109         this.etag = etag;
 110     }
 111 
 112     public boolean isActiveFor(double y, int etag) {
 113         return (this.etag == etag && this.activey >= y);
 114     }
 115 
 116     public String toString() {
 117         return ("Edge["+curve+
 118                 ", "+
 119                 (ctag == AreaOp.CTAG_LEFT ? "L" : "R")+
 120                 ", "+
 121                 (etag == AreaOp.ETAG_ENTER ? "I" :
 122                  (etag == AreaOp.ETAG_EXIT ? "O" : "N"))+
 123                 "]");
 124     }
 125 }