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:
33: package com.vividsolutions.jump.workbench.ui.cursortool;
34:
35: import java.awt.geom.NoninvertibleTransformException;
36: import java.util.ArrayList;
37:
38: import com.vividsolutions.jts.geom.Coordinate;
39: import com.vividsolutions.jts.geom.GeometryFactory;
40: import com.vividsolutions.jts.geom.Polygon;
41: import com.vividsolutions.jts.operation.valid.IsValidOp;
42: import com.vividsolutions.jump.I18N;
43: import com.vividsolutions.jump.workbench.ui.EditTransaction;
44:
45: public abstract class PolygonTool extends MultiClickTool {
46: public PolygonTool() {
47: setCloseRing(true);
48: setMetricsDisplay(new CoordinateListMetrics());
49: }
50:
51: /**
52: * Callers should check whether the polygon returned is valid.
53: */
54: protected Polygon getPolygon()
55: throws NoninvertibleTransformException {
56: ArrayList closedPoints = new ArrayList(getCoordinates());
57:
58: if (!closedPoints.get(0).equals(
59: closedPoints.get(closedPoints.size() - 1))) {
60: closedPoints.add(new Coordinate((Coordinate) closedPoints
61: .get(0)));
62: }
63:
64: return new GeometryFactory().createPolygon(
65: new GeometryFactory()
66: .createLinearRing(toArray(closedPoints)), null);
67: }
68:
69: protected boolean checkPolygon()
70: throws NoninvertibleTransformException {
71: if (getCoordinates().size() < 3) {
72: getPanel()
73: .getContext()
74: .warnUser(
75: I18N
76: .get("ui.cursortool.PolygonTool.the-polygon-must-have-at-least-3-points"));
77:
78: return false;
79: }
80:
81: IsValidOp isValidOp = new IsValidOp(getPolygon());
82:
83: if (!isValidOp.isValid()) {
84: getPanel().getContext().warnUser(
85: isValidOp.getValidationError().getMessage());
86:
87: if (getWorkbench().getBlackboard().get(
88: EditTransaction.ROLLING_BACK_INVALID_EDITS_KEY,
89: false)) {
90: return false;
91: }
92: }
93:
94: return true;
95: }
96: }
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