01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: *
21: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32: package com.vividsolutions.jump.workbench.ui.snap;
33:
34: import com.vividsolutions.jts.geom.Coordinate;
35:
36: import com.vividsolutions.jump.util.Blackboard;
37: import com.vividsolutions.jump.workbench.ui.LayerViewPanel;
38:
39: import java.util.ArrayList;
40: import java.util.Collection;
41: import java.util.Iterator;
42:
43: /**
44: * Inputs and outputs are in model space, not view space.
45: */
46: public class SnapManager {
47: private static final String TOLERANCE_IN_PIXELS_KEY = SnapManager.class
48: .getName()
49: + " - TOLERANCE IN PIXELS";
50: private ArrayList policies = new ArrayList();
51: private boolean snapCoordinateFound;
52:
53: public SnapManager() {
54: }
55:
56: public Coordinate snap(LayerViewPanel panel,
57: Coordinate originalCoordinate) {
58: for (Iterator i = policies.iterator(); i.hasNext();) {
59: SnapPolicy policy = (SnapPolicy) i.next();
60: Coordinate snapCoordinate = policy.snap(panel,
61: originalCoordinate);
62:
63: if (snapCoordinate != null) {
64: snapCoordinateFound = true;
65:
66: return snapCoordinate;
67: }
68: }
69:
70: snapCoordinateFound = false;
71:
72: return originalCoordinate;
73: }
74:
75: public void addPolicies(Collection policies) {
76: this .policies.addAll(policies);
77: }
78:
79: public boolean wasSnapCoordinateFound() {
80: return snapCoordinateFound;
81: }
82:
83: public static int getToleranceInPixels(Blackboard blackboard) {
84: return blackboard.get(TOLERANCE_IN_PIXELS_KEY, 10);
85: }
86:
87: public static void setToleranceInPixels(int toleranceInPixels,
88: Blackboard blackboard) {
89: blackboard.put(TOLERANCE_IN_PIXELS_KEY, toleranceInPixels);
90: }
91: }
|