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Java > Open Source Codes > org > antlr > xjlib > appkit > gview > shape > SLinkElbowLeftLeft


1 /*
2
3 [The "BSD licence"]
4 Copyright (c) 2005 Jean Bovet
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
9 are met:
10
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13 2. Redistributions in binary form must reproduce the above copyright
14 notice, this list of conditions and the following disclaimer in the
15 documentation and/or other materials provided with the distribution.
16 3. The name of the author may not be used to endorse or promote products
17 derived from this software without specific prior written permission.
18
19 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 */
31
32 package org.antlr.xjlib.appkit.gview.shape;
33
34 import org.antlr.xjlib.appkit.gview.base.Path2D;
35 import org.antlr.xjlib.appkit.gview.base.Vector2D;
36 import org.antlr.xjlib.appkit.gview.object.GElementRect;
37
38 public class SLinkElbowLeftLeft {
39
40     public static final int LEFT_LEFT = 0;
41     public static final int RIGHT_RIGHT = 1;
42     public static final int LABEL_OFFSET = 10;
43
44     public SLinkElbow link = null;
45     public Path2D path = null;
46
47     public SLinkElbowLeftLeft(SLinkElbow link) {
48         this.link = link;
49     }
50
51     public void updateLeftLeft() {
52         this.path = link.path;
53         if(Math.abs(link.end.y-link.start.y)>=GElementRect.DEFAULT_WIDTH*0.5+10) {
54             buildVerticalPath(LEFT_LEFT);
55         } else {
56             // Objects are too close
57 if(link.start.x<link.end.x)
58                 buildHorizontalRightBelowPath();
59             else
60                 buildHorizontalRightAbovePath();
61         }
62     }
63
64     public void updateRightRight() {
65         this.path = link.path;
66         if(Math.abs(link.end.y-link.start.y)>=GElementRect.DEFAULT_WIDTH*0.5+10) {
67             buildVerticalPath(RIGHT_RIGHT);
68         } else {
69             // Objects are too close
70 if(link.start.x<link.end.x)
71                 buildHorizontalRightAbovePath();
72             else
73                 buildHorizontalRightBelowPath();
74         }
75     }
76
77     public void buildVerticalPath(int direction) {
78         Vector2D start_ = link.getStartWithOffset();
79         Vector2D end_ = link.getEndWithOffset();
80
81         double farest_x = 0;
82         if(direction == LEFT_LEFT)
83             farest_x = Math.min(start_.x, end_.x);
84         else
85             farest_x = Math.max(start_.x, end_.x);
86
87         Vector2D p1 = start_.add(new Vector2D(farest_x-start_.x, 0));
88         Vector2D p2 = end_.add(new Vector2D(farest_x-end_.x, 0));
89
90         path.add(link.start);
91         path.add(start_);
92         path.add(p1);
93         path.add(p2);
94         path.add(end_);
95         path.add(link.end);
96
97         link.label.setPosition(p1.add(p2.sub(p1).stretch(0.5)).shift(-LABEL_OFFSET, 0));
98     }
99
100     public void buildHorizontalRightBelowPath() {
101         Vector2D start_ = link.getStartWithOffset();
102         Vector2D end_ = link.getEndWithOffset();
103
104         Vector2D start = link.start;
105         Vector2D end = link.end;
106
107         double farest_y = start_.y+GElementRect.DEFAULT_WIDTH*0.5+10;
108
109         // Extend the link to the RIGHT
110
111         Vector2D p1 = start_.add(new Vector2D(0, farest_y-start_.y));
112         Vector2D p2 = end_.add(new Vector2D(0, farest_y-end_.y));
113
114         path.add(start);
115         path.add(start_);
116         path.add(p1);
117         path.add(p2);
118         path.add(end_);
119         path.add(end);
120
121         link.label.setPosition(p1.add(p2.sub(p1).stretch(0.5)).shift(-LABEL_OFFSET, 0));
122     }
123
124     public void buildHorizontalRightAbovePath() {
125         Vector2D start_ = link.getStartWithOffset();
126         Vector2D end_ = link.getEndWithOffset();
127
128         Vector2D start = link.start;
129         Vector2D end = link.end;
130
131         double farest_y = end_.y+GElementRect.DEFAULT_WIDTH*0.5+10;
132
133         // Extend the link to the RIGHT
134
135         Vector2D p1 = start_.add(new Vector2D(0, farest_y-start_.y));
136         Vector2D p2 = end_.add(new Vector2D(0, farest_y-end_.y));
137
138         path.add(start);
139         path.add(start_);
140         path.add(p1);
141         path.add(p2);
142         path.add(end_);
143         path.add(end);
144
145         link.label.setPosition(p1.add(p2.sub(p1).stretch(0.5)).shift(-LABEL_OFFSET, 0));
146     }
147
148 }
149
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