001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.modules.uml.ui.products.ad.viewfactory;
043:
044: import java.awt.geom.GeneralPath;
045:
046: import org.netbeans.modules.uml.ui.support.viewfactorysupport.DrawEngineArrowheadKindEnum;
047: import org.netbeans.modules.uml.ui.support.viewfactorysupport.IDrawInfo; //import com.tomsawyer.util.TSConstPoint;
048: import com.tomsawyer.drawing.geometry.TSConstPoint; //import com.tomsawyer.util.TSTransform;
049: import com.tomsawyer.editor.TSTransform;
050:
051: public class ETUnFilledHalfArrow extends ETArrowHead {
052: public ETUnFilledHalfArrow() {
053: super (DrawEngineArrowheadKindEnum.DEAK_UNFILLEDHALFARROW);
054: }
055:
056: /* (non-Javadoc)
057: * @see org.netbeans.modules.uml.ui.products.ad.viewfactory.ETArrowHead#isOpenRegion()
058: */
059: protected boolean isOpenRegion() {
060: return true;
061: }
062:
063: public GeneralPath getShape(IDrawInfo pInfo, TSConstPoint fromPt,
064: TSConstPoint toPt) {
065: TSTransform transform = pInfo.getTSTransform();
066: double fromX = fromPt.getX();
067: double fromY = fromPt.getY();
068: double toX = toPt.getX();
069: double toY = toPt.getY();
070:
071: float edgeVectorX = transform.widthToDevice(toX - fromX);
072: float edgeVectorY = transform.heightToDevice(toY - fromY);
073: float edgeLength = (float) Math
074: .sqrt((edgeVectorX * edgeVectorX)
075: + (edgeVectorY * edgeVectorY));
076:
077: // avoid divide-by-zero.
078: if (edgeLength == 0.0f)
079: return null;
080:
081: int lineFromX = transform.xToDevice(fromX);
082: int lineFromY = transform.yToDevice(fromY);
083: int lineToX = transform.xToDevice(toX);
084: int lineToY = transform.yToDevice(toY);
085:
086: float halfArrowWidth = transform.widthToDevice(this .getWidth()) / 2;
087: float arrowHeight = transform.heightToDevice(this .getHeight());
088:
089: // normalize the edge vector components.
090: edgeVectorX /= edgeLength;
091: edgeVectorY /= edgeLength;
092:
093: // calculate the vector from the center of the base to
094: // the arrow tip
095: float arrowHeightX = arrowHeight * edgeVectorX;
096: float arrowHeightY = arrowHeight * edgeVectorY;
097:
098: // calculate the vector from the base center point to
099: // the edge of the base
100: float halfBaseVectorX = halfArrowWidth * edgeVectorY;
101: float halfBaseVectorY = halfArrowWidth * edgeVectorX;
102:
103: // draw GeneralPath (polyline)
104: GeneralPath polyline = new GeneralPath(
105: GeneralPath.WIND_EVEN_ODD);
106:
107: polyline.moveTo(lineToX
108: - (int) (arrowHeightX - halfBaseVectorX), lineToY
109: + (int) (arrowHeightY + halfBaseVectorY));
110:
111: polyline.lineTo(lineToX, lineToY);
112:
113: return polyline;
114: }
115: }
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