blob: 5b4ffa427df3e4cd4d673e3747051a949ab46a8e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.diagram.layout;
import java.util.ArrayList;
import java.util.List;
public class LayoutBuilder {
private Entity[] elts = null;
private int[][] conns = null;
private int maxLevels = 8;
/**
* Constructor which takes set of entities and their connection matrix
* @param maxLevels TODO
*/
public LayoutBuilder(Entity[] entities, int[][] connections, int maxLevels) {
elts = entities;
conns = connections.clone();
this.maxLevels = maxLevels;
}
/**
* Layout Building Algorithm
* ~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Here we position (i.e. assigning a level and a lane) all Entities
* in a unique cell of a grid.
*
* lane0 lane1 lane2 lane3 ....
* _______________________________
* level0 | | | | |
* |_______|_______|_______|_______|
* level1 | | | | |
* |_______|_______|_______|_______|
* level2 | | | | |
*
* 1) Determining the Entity at level0, lane0 (starting entity)
* -First Entity in the list of Entities which has one or more adjacent Entities
* -If there is only one Entity it will eventually chosen
*
* 2) Get connected Entities of starting Entity.
* * If there are connected entities;
* *For each connected Entity;
* *We assign a corresponding level and a lane
* *Then recurse the procedure for connections of the assigned Entity
*
*
*/
public Entity[] placeEntities() {
sortEntities();
assignCoordinates();
return elts;
}
private void assignCoordinates() {
for (Entity ent : elts) {
ent.setX(ent.getParent().getX() + ent.getStartPosition());
ent.setY(ent.getParent().getY() + ent.getStartPosition() / 2);
}
}
private Entity findEntity(int i) {
for (Entity ent : elts) {
if (ent.getId() == i) {
return ent;
}
}
return null;
}
private void setPosition(Entity ent, int level, int lane) {
ent.setLevel(level);
ent.setLane(lane);
ent.setPositionSet(true);
}
/**
* Perform a topological sort on the graph so that we can place the entities into level/lane grids
*/
private void sortEntities() {
int lane = 0;
while (true) {
List<Integer> ids = new ArrayList<Integer>();
for (int i = 0; i < conns.length; i++) {
Entity ent = findEntity(i);
if (ent.isPositionSet()) {
continue;
}
boolean beingConnected = false;
for (int j = 0; j < conns.length; j++) {
if (conns[j][i] == 1) {
beingConnected = true;
break;
}
}
if (!beingConnected) {
ids.add(i);
}
}
if (ids.isEmpty()) {
boolean end = true;
// There might be circular dependencies
for (Entity e : elts) {
if (!e.isPositionSet()) {
// Pick the first one
ids.add(e.getId());
end = false;
break;
}
}
if (end) {
return;
}
}
int level = 0;
for (int i : ids) {
setPosition(findEntity(i), level++, lane);
if (maxLevels > 0 && (level % maxLevels == 0)) {
level = 0;
lane++;
}
for (int j = 0; j < conns.length; j++) {
// Remove the connections from i
conns[i][j] = 0;
}
}
lane++;
}
}
}
|