root / branches / v2_0_0_prep / applications / appgvSIG / src / org / gvsig / app / project / documents / view / toolListeners / snapping / snappers / PerpendicularPointSnapper.java @ 30349
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package org.gvsig.app.project.documents.view.toolListeners.snapping.snappers; |
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import java.awt.geom.PathIterator; |
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import java.awt.geom.Point2D; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.mapcontrol.PrimitivesDrawer; |
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import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapperVectorial; |
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import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.impl.AbstractSnapper; |
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import com.vividsolutions.jts.geom.Coordinate; |
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import com.vividsolutions.jts.geom.LineSegment; |
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/**
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* Perpendicular point snapper.
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*
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* @author Vicente Caballero Navarro
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*/
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public class PerpendicularPointSnapper extends AbstractSnapper |
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implements ISnapperVectorial {
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/* (non-Javadoc)
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* @see com.iver.cit.gvsig.gui.cad.snapping.ISnapper#getSnapPoint(Point2D point,
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* IGeometry geom,double tolerance, Point2D lastPointEntered)
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*/
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public Point2D getSnapPoint(Point2D point, Geometry geom, |
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double tolerance, Point2D lastPointEntered) { |
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Point2D resul = null; |
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Coordinate c = new Coordinate(point.getX(), point.getY());
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if (lastPointEntered == null) { |
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return null; |
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} |
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Coordinate cLastPoint = new Coordinate(lastPointEntered.getX(),
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lastPointEntered.getY()); |
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PathIterator theIterator = geom.getPathIterator(null, |
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geomManager.getFlatness()); //polyLine.getPathIterator(null, flatness);
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double[] theData = new double[6]; |
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double minDist = tolerance;
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Coordinate from = null;
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Coordinate first = null;
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while (!theIterator.isDone()) {
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//while not done
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int theType = theIterator.currentSegment(theData);
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switch (theType) {
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case PathIterator.SEG_MOVETO: |
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from = new Coordinate(theData[0], theData[1]); |
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first = from; |
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break;
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case PathIterator.SEG_LINETO: |
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// System.out.println("SEG_LINETO");
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Coordinate to = new Coordinate(theData[0], theData[1]); |
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LineSegment line = new LineSegment(from, to);
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Coordinate closestPoint = line.closestPoint(cLastPoint); |
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double dist = c.distance(closestPoint);
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if (!(line.getCoordinate(0).equals2D(closestPoint) || |
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line.getCoordinate(1).equals2D(closestPoint))) {
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if ((dist < minDist)) {
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resul = new Point2D.Double(closestPoint.x, |
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closestPoint.y); |
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minDist = dist; |
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} |
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} |
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from = to; |
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break;
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case PathIterator.SEG_CLOSE: |
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line = new LineSegment(from, first);
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closestPoint = line.closestPoint(cLastPoint); |
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dist = c.distance(closestPoint); |
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if (!(line.getCoordinate(0).equals2D(closestPoint) || |
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line.getCoordinate(1).equals2D(closestPoint))) {
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if ((dist < minDist)) {
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resul = new Point2D.Double(closestPoint.x, |
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closestPoint.y); |
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minDist = dist; |
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} |
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} |
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from = first; |
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break;
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} //end switch
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theIterator.next(); |
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} |
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return resul;
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} |
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/* (non-Javadoc)
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* @see com.iver.cit.gvsig.gui.cad.snapping.ISnapper#getToolTipText()
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*/
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public String getToolTipText() { |
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return "perpendicular_point"; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapper#draw(org.gvsig.fmap.mapcontrol.PrimitivesDrawer, java.awt.geom.Point2D)
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*/
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public void draw(PrimitivesDrawer primitivesDrawer, Point2D pPixels) { |
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primitivesDrawer.setColor(getColor()); |
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int half = getSizePixels() / 2; |
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int x1 = (int) (pPixels.getX() - half); |
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int x2 = (int) (pPixels.getX() + half); |
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int x3 = (int) pPixels.getX(); |
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int y1 = (int) (pPixels.getY() - half); |
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int y2 = (int) (pPixels.getY() + half); |
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int y3 = (int) pPixels.getY(); |
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primitivesDrawer.drawLine(x1, y2, x2, y2); |
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primitivesDrawer.drawLine(x1, y2, x1, y1); |
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primitivesDrawer.drawLine(x1, y3, x3, y3); |
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primitivesDrawer.drawLine(x3, y3, x3, y2); |
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} |
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} |