root / trunk / extensions / extSymbology / src / org / gvsig / symbology / fmap / labeling / placements / LinePlacementInTheMiddle.java @ 20768
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package org.gvsig.symbology.fmap.labeling.placements; |
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import java.awt.geom.Point2D; |
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import org.apache.batik.ext.awt.geom.PathLength; |
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import com.iver.cit.gvsig.fmap.core.FShape; |
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import com.iver.cit.gvsig.fmap.rendering.styling.labeling.IPlacementConstraints; |
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import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelClass; |
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import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelLocationMetrics; |
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import com.iver.utiles.swing.threads.Cancellable; |
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/**
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*
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* LinePlacementInTheMiddle.java
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*
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*
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* @author jaume dominguez faus - jaume.dominguez@iver.es Dec 17, 2007
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*
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*/
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public class LinePlacementInTheMiddle extends AbstractLinePlacement { |
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public boolean isSuitableFor(IPlacementConstraints placementConstraints, |
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int shapeType) {
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if (shapeType == FShape.LINE) {
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return placementConstraints != null && |
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placementConstraints.isInTheMiddleOfLine() |
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&& !placementConstraints.isFollowingLine(); |
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} |
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return false; |
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} |
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@Override
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LabelLocationMetrics initialLocation(LabelClass lc, |
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IPlacementConstraints pc, PathLength pathLen, Cancellable cancel) { |
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if (cancel.isCanceled()) return null; |
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float length = pathLen.lengthOfPath();
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float distance = (float) (length * 0.5); |
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double theta = 0; |
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if (pc.isParallel()) {
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// get the line theta and apply it
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theta = pathLen.angleAtLength(distance); |
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} else if (pc.isPerpendicular()) { |
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// get the line theta with 90 degrees
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theta = pathLen.angleAtLength(distance) + AbstractLinePlacement.HALF_PI; |
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} |
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Point2D p = pathLen.pointAtLength(distance);
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/*
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* Offset the point to a distance of the height of the
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* label class's height to make the label appear to
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* be on the line.
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*
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*/
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double x = p.getX();
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double y = p.getY();
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double halfHeight = lc.getBounds().getHeight()*.5; |
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double halfWidth = lc.getBounds().getWidth()*.5; |
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double sinTheta = Math.sin(theta); |
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double cosTheta = Math.cos(theta); |
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double xOffset = halfHeight * sinTheta;
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double yOffset = halfHeight * cosTheta;
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/*
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* now, offset the anchor point as much as need to
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* make the center of the label be the middle of the
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* line
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*/
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xOffset -= halfWidth * cosTheta; |
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yOffset += halfWidth * sinTheta; |
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p.setLocation(x + xOffset, y - yOffset); |
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return new LabelLocationMetrics( |
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p, |
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theta, |
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true);
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} |
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} |
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