svn-gvsig-desktop / trunk / libraries / libCq CMS for java.old / src / org / cresques / geo / Mercator.java @ 9
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/*
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* Created on 01-may-2004
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*
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* @author "Luis W. Sevilla" <sevilla_lui@gva.es>
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*/
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package org.cresques.geo; |
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import java.awt.FontMetrics; |
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import java.awt.Graphics2D; |
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import java.awt.geom.AffineTransform; |
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import java.awt.geom.Point2D; |
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import org.cresques.px.Extent; |
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/**
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* Proyeccion Mercator
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* @author "Luis W. Sevilla" <sevilla_lui@gva.es>* @author administrador
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*/
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public class Mercator extends Projection { |
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static String name = "Mercator"; |
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static String abrev = "Mer"; |
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private double a, f, b, Eps2, EE2, EE3, Epps2; |
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public Mercator(Ellipsoid eli) {
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super(eli);
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grid = new Graticule(this); |
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double [] p = eli.getParam(); |
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a =p[1];
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f =1/p[2]; |
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b =p[3];
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Eps2 =p[5];
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EE2 =Eps2*Eps2; |
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EE3 =EE2*Eps2; |
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Epps2 =p[7];
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} |
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public String getAbrev() { return abrev;} |
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public static Mercator getProjection(Ellipsoid eli) { |
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return new Mercator(eli); |
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} |
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/**
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*
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*/
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public static Projection getProjectionByName(Ellipsoid eli, String name) { |
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if (name.indexOf("Me") < 0) |
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return null; |
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return getProjection(eli);
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} |
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/**
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*
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*/
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public Point2D createPoint(double x, double y){ |
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return new ProjPoint(this, x, y); |
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} |
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/**
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*
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* @param uPt
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* @return
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*/
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public GeoPoint toGeo(Point2D mPt) { |
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GeoPoint gPt = new GeoPoint();
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return toGeo((ProjPoint) mPt, gPt);
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} |
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/**
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*
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* @param mPt
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* @param gPt
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* @return
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*/
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public GeoPoint toGeo(ProjPoint mPt, GeoPoint gPt) {
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double t = Math.pow(Math.E,(-mPt.getY()/a)); |
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double x1, x=(Math.PI/2-2*Math.atan(t)); |
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do {
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x1 =x; |
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x = Math.PI/2-2*Math.atan(t*(Math.pow((1-Math.sqrt(Eps2)*Math.sin(x))/ |
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(1+Math.sqrt(Eps2)*Math.sin(x)),(Math.sqrt(Eps2)/2)))); |
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} while ((x-x1)>0.0000000001); |
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double lat = Math.PI / 2-2 * Math.atan(t*(Math.pow((1-Math.sqrt(Eps2)*Math.sin(x))/ |
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(1+Math.sqrt(Eps2)*Math.sin(x)),(Math.sqrt(Eps2)/2)))); |
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double lng = mPt.getX()/a;
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gPt.setLocation(lng*180.0/Math.PI, lat*180.0/Math.PI); |
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gPt.proj = Geodetic.getProjection(mPt.proj.eli); |
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return gPt;
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} |
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/**
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*
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* @param gPt
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* @param uPt
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* @return
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*/
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public Point2D fromGeo(GeoPoint gPt, ProjPoint mPt) { |
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double sl = Math.sin(gPt.Latitude.ToRadians()); |
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double cl = Math.cos(gPt.Latitude.ToRadians()); |
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double tl =(1+sl)/(1-sl); |
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// Calcula Easting
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double x = a * gPt.Longitude.ToRadians();
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// Calcula Northing
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double y=Math.pow(((1-Math.sqrt(Eps2)*sl)/(1+Math.sqrt(Eps2)*sl)),(Math.sqrt(Eps2))); |
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y= a/2 *(Math.log(tl*y)); |
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mPt.setLocation(x, y); |
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mPt.proj = this;
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return mPt;
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} |
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// Calcula el step en funci?n del zoom
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private void generateGrid(Graphics2D g, Extent extent, AffineTransform mat) { |
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// calculo del step en funci?n del zoom
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Point2D pt1 = extent.getMin();
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double step = 3.0, x = pt1.getX(), dist = 0.0; |
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ProjPoint ppt1, ppt2; |
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GeoPoint gp1, gp2; |
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ppt1 = (ProjPoint) createPoint( x, pt1.getY()); |
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ppt2 = (ProjPoint) createPoint(x+100, pt1.getY()-100); |
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gp1 = ppt1.toGeo(); |
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gp2 = ppt2.toGeo(); |
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/* GeoPoint gp1, gp2;
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gp1 = (GeoPoint) createPoint( x, (int) pt1.getY());
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mat.transform(gp1, gp1);
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gp2 = (GeoPoint) createPoint(gp1.getX()+100, gp1.getY()-100);
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try {
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mat.inverseTransform(gp2, gp2);
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} catch (NoninvertibleTransformException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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dist = (gp2.getX()-x);
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System.err.println("distX = " + dist);
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if (dist > 30.0) { step = 30.0;
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} else if (dist > 18.0) { step = 18.0;
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} else if (dist > 12.0) { step = 12.0;
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} else if (dist > 6.0) { step = 6.0;
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} else if (dist > 3.0) { step = 3.0;
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} else if (dist > 2.0) { step = 2.0;
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} else if (dist > 1.0) { step = 1.0;
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} else if (dist > .5) { step =.5;
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} else if (dist > .25) { step =.25;
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} else if (dist > 1.0/60*5.0) { step = 1.0/60*5.0;
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} else { step = 1.0/60*2.0;
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}
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//step = 1.0;
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*/
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generateGrid(g, extent, mat, step); |
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} |
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private void generateGrid(Graphics2D g, Extent extent, AffineTransform mat, double step) { |
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grid = new Graticule(this); |
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Point2D pt1 = extent.getMin(), pt2 = extent.getMax();
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Point2D.Double ptx = new Point2D.Double(0.0, 0.0); |
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GeoPoint gp1, gp2; |
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ProjPoint up1 = (ProjPoint) createPoint(0,0), |
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up2 = (ProjPoint) createPoint(0,0); |
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Geodetic geoProj = Geodetic.getProjection(this.getEllipsoid());
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double xAxis, yAxis;
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// Calculos para el texto
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FontMetrics fm = g.getFontMetrics();
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int fmWidth = 0, fmHeight = fm.getAscent(); |
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String tit = ""; |
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String fmt = "%G?%N"; |
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if (step < 1.0) |
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fmt = "%G?%M'%N";
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// Lineas Horzontales
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gp1 = toGeo(new ProjPoint(pt1));
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gp2 = toGeo(new ProjPoint(pt2));
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xAxis = gp1.getX(); yAxis = gp2.getY(); |
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System.err.println(name+": ViewPort Extent = ("+gp1+","+gp2+")"); |
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double xMin = (int) gp1.getX() - 1.0; |
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xMin -= (xMin % step); |
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double xMax = (int) gp2.getX() + 1.0; |
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double yMin = (int) gp1.getY() - 1.0; |
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yMin -= (yMin % step); |
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double yMax = (int) gp2.getY() + 1.0; |
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if (xMin < -180.0) xMin = -180.0; |
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if (xMax > 180.0) xMax = 180.0; |
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if (yMin < -80.0) yMin = -80.0; |
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if (yMax > 80.0) yMax = 80.0; |
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if (xAxis < -180.0) xAxis = -180.0; |
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if (yAxis > 80.0) yAxis = 80.0; |
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for (double y=yMin; y<=yMax; y+=step) { |
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gp1 = (GeoPoint) geoProj.createPoint(xAxis, y); |
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gp2 = (GeoPoint) geoProj.createPoint(xMax, y); |
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fromGeo(gp1, up1); |
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fromGeo(gp2, up2); |
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mat.transform(up1, up1); |
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mat.transform(up2, up2); |
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grid.addLine(up1, up2); |
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tit = coordToString(y, fmt, true);
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//fmWidth = fm.stringWidth(tit);
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ptx.setLocation(up1.getX()+3, up1.getY()-2); |
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grid.addText(tit, ptx); |
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} |
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// Lineas Verticales
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for (double x=xMin; x<=xMax; x+=step) { |
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gp1 = (GeoPoint) geoProj.createPoint(x, yMin); |
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gp2 = (GeoPoint) geoProj.createPoint(x, yAxis); |
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fromGeo(gp1, up1); |
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fromGeo(gp2, up2); |
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mat.transform(up1, up1); |
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mat.transform(up2, up2); |
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grid.addLine(up1, up2); |
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tit = coordToString(x, fmt, false);
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//fmWidth = fm.stringWidth(tit);
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ptx.setLocation(up2.getX()+3, up2.getY()+fmHeight);
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grid.addText(tit, ptx); |
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} |
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} |
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public void drawGrid(Graphics2D g, ViewPort vp) { |
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generateGrid(g, vp.getExtent(), vp.getMat()); |
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grid.setColor(gridColor); |
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grid.draw(g, vp); |
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} |
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} |