153 lines
3.8 KiB
Java
153 lines
3.8 KiB
Java
//This file is part of SECONDO.
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//Copyright (C) 2004, University in Hagen, Department of Computer Science,
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//Database Systems for New Applications.
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//SECONDO is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//SECONDO 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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//You should have received a copy of the GNU General Public License
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//along with SECONDO; 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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9 Dsplregion2
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9.1 Overview
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This file contains the implementation to add the new type ~Region2~ of the
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~SpatialLRAlgebra~ to the ~HoeseViewer~.
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*/
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package viewer.hoese.algebras;
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import java.awt.geom.*;
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import java.math.*;
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import java.awt.*;
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import sj.lang.ListExpr;
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import java.util.*;
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import viewer.*;
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import viewer.hoese.*;
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import tools.Reporter;
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/*
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9.2 Class ~Dsplregion2
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*/
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public class Dsplregion2 extends DisplayGraph {
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/*
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The internal datastructure of the region2 datatype
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*/
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Area areas;
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/*
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boolean flag indicating the defined state
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*/
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boolean defined;
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/*
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The textual representation of this region2
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*/
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String entry;
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public int numberOfShapes(){
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return 1;
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}
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public Shape getRenderObject(int num,AffineTransform at){
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if(num<1){
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return areas;
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} else{
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return null;
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}
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}
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/*
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Creates an instance of ~Area~ form the ~ListExpr~.
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*/
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public boolean ScanValue (ListExpr expr) {
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if(isUndefined(expr)){
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defined=false;
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areas=null;
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return false;
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}
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if (expr.listLength() != 2) {
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Reporter.writeError("Invalid line2 expression: 4 elements needed");
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err = true;
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return false;
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}
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defined=true;
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GeneralPath gp = new GeneralPath();
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ListExpr types = expr.first();
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ListExpr coords = expr.second();
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int offsetCoords = 0;
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double x1, x2, y1, y2 = 0;
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while(!types.isEmpty()) {
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if(LEUtils.readNumeric(types.first()) == 0) {
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x1 = LEUtils.readNumeric(coords.first());
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coords = coords.rest();
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y1 = LEUtils.readNumeric(coords.first());
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coords = coords.rest();
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gp.moveTo(x1,y1);
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} else if(LEUtils.readNumeric(types.first()) == 1) {
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x1 = LEUtils.readNumeric(coords.first());
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coords = coords.rest();
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y1 = LEUtils.readNumeric(coords.first());
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coords = coords.rest();
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gp.lineTo(x1,y1);
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} else if(LEUtils.readNumeric(types.first()) == 4) {
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gp.closePath();
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}
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types = types.rest();
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}
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gp.closePath();
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areas = new Area(gp);
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return true;
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}
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/*
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Gets called by ~HoeseViewer~ to change a list expr to a java object.
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*/
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public void init (String name, int nameWidth, int indent, ListExpr type, ListExpr value, QueryResult qr) {
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AttrName = extendString(name,nameWidth, indent);
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ScanValue(value);
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if (err) {
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Reporter.writeError("Error in ListExpr :parsing aborted");
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entry = AttrName + " : <error>";
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qr.addEntry(entry);
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areas=null;
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return;
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}
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else if(!defined){
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entry = AttrName+" : undefined";
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qr.addEntry(entry);
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return;
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}
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// normal case-> defined line
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entry = AttrName + " : region";
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defined=areas!=null;
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err=false;
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qr.addEntry(this);
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}
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}
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