| gvSIG desktop 1

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<artifactId>org.gvsig.dwg</artifactId>

	<packaging>jar</packaging>

	<version>2.0-SNAPSHOT</version>

	<name>libDwg</name>

	<parent>

		<groupId>org.gvsig</groupId>

		<artifactId>gvsig-base-library-pom</artifactId>

		<version>2.0-SNAPSHOT</version>

	</parent>	

	<properties>

		<build-dir>${basedir}/../build</build-dir>

        <eclipse.project.name>libDwg</eclipse.project.name>

	</properties>

	<dependencies>

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <scope>compile</scope>

        </dependency>

		<dependency>

			<groupId>org.gvsig</groupId>

	        <artifactId>org.gvsig.tools.lib</artifactId>

            <scope>compile</scope>

      	</dependency>

      	<dependency>

      		<groupId>org.gvsig</groupId>

      		<artifactId>org.gvsig.projection</artifactId>

      	</dependency>

      	<dependency>

			<groupId>org.gvsig</groupId>

			<artifactId>org.gvsig.fmap.geometry</artifactId>

            <scope>compile</scope>

		</dependency>

	</dependencies>

	<build>

		<sourceDirectory>src</sourceDirectory>

		<testSourceDirectory>src-test</testSourceDirectory>

		<testResources>

			<testResource>

				<directory>src-test</directory>

			</testResource>

		</testResources>

        <plugins>

            <!-- TODO: MAKE TESTS WORK AND REMOVE THIS OPTION -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-surefire-plugin</artifactId>

                <configuration>

                    <skipTests>true</skipTests>

                </configuration>

            </plugin>       

        </plugins>

	</build>

</project>

/*

 * Created on 08-feb-2007

 *

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id$

* $Log$

* Revision 1.1.2.1  2007-02-28 07:35:10  jmvivo

* Actualizado desde el HEAD.

*

* Revision 1.1  2007/02/08 20:27:57  azabala

* *** empty log message ***

*

*

*/

package org.gvsig.dwg.lib;

import junit.framework.Test;

import junit.framework.TestSuite;

public class DwgTestSuite {

	public static Test suite() {

		TestSuite suite = new TestSuite("Test for com.iver.cit.jdwglib.dwg");

		//$JUnit-BEGIN$

		suite.addTestSuite(DwgFileTest.class);

		//$JUnit-END$

		return suite;

	}

}

package org.gvsig.dwg.lib;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import junit.framework.TestCase;

public class DwgFileTest extends TestCase {

	private File baseDataPath;

	protected void setUp() throws Exception {

		super.setUp();

		URL url = this.getClass().getResource("data");

		if (url == null) {

			throw new Exception("Can't find 'data' dir");

		}

		baseDataPath = new File(url.getFile());

		if (!baseDataPath.exists()) {

			throw new Exception("Can't find 'data' dir");

		}

	}

	protected void tearDown() throws Exception {

		super.tearDown();

	}

	public void test1() throws IOException, DwgVersionNotSupportedException {

//		String fileName = baseDataPath.getAbsolutePath()+"/Un punto.dwg";

//		DwgFile dwg = new DwgFile(fileName);

//

//		dwg.read();

//		dwg.calculateGisModelDwgPolylines();

//		dwg.blockManagement();

//		LinkedList dwgObjects = dwg.getDwgObjects();

	}

	public void test2() throws RuntimeException, CorruptedDwgEntityException{

        //Dwg Object that is supposed to be

        //an LWPOLYLINE in V14 version

		/*

        int[] data = new int[]{61,64,64,183,19,227,104,16

                            ,0,5,8,59,72,32,252,47,90,142,

                            234,145,50,10,71,11,213,36,229,

                            162,130,10,228,126,23,174,130,

                            145,50,15,98,141,196,244,229,

                            162,130,12,126,23,169,66,58,

                            145,50,12,47,90,138,68,229,

                            162,130,8,0,0,4,7,74,137,50,

                            15,177,66,231,252,221,162,130,

                            9,130,151,21,242,151,21,190,

                            8,21,8,56};

         */

//		int[] data = new int[]{62,128,64,71,99,

//							   40,48,0,5,8,27,72,

//							   100,126,23,169,68,

//							   178,105,50,13,114,

//							   63,11,82,165,162,130,

//							   13,114,63,11,210,138,

//							   105,50,8,173,114,59,

//							   138,205,162,130,15,98,

//							   141,192,241,58,105,50,

//							   11,51,51,52,178,229,162,

//							   130,14,110,102,98,97,234,

//							   105,50,11,51,51,52,179,21,

//							   162,130,10,149,192,240,42,

//							   162,105,50,14,189,27,131,

//							   107,69,162,130,14,31,169,

//							   66,227,74,105,50,9,240,86,

//							   185,27,117,162,130,11,59,

//							   51,51,52,234,105,50,13,114,

//							   63,11,83,85,162,130,9,74,228,

//							   126,22,186,105,50,11,51,51,50,

//							   51,53,162,130,11,137,232,82,190,

//							   58,105,50,9,74,228,122,147,13,162,

//							   130,11,137,232,82,189,106,105,50,9,

//							   74,228,122,146,213,162,130,9,74,228,122,20,202,105,50,12,126,23,171,194,173,162,130,12,126,23,169,68,178,105,50,13,114,63,11,82,165,162,130,9,130,151,22,10,136,182,8,21,8,120};

//        //1er intento: suponemos que la LWPOLYLINE cumple la especificaci?n

//        //a rajatabla

//        int bitPos = 0;

//        List val = DwgUtil.getBitShort(data, bitPos);

//        bitPos = ((Integer) val.get(0)).intValue();

//        int type = ((Integer) val.get(1)).intValue();

//        System.out.println("type = " + type);

//

//        DwgHandleReference hr = new DwgHandleReference();

//        bitPos = hr.read(data, bitPos);

//        System.out.println("handle, code="+

//                    hr.getCode()+

//                    " ,offset="+

//                    hr.getOffset());

//

//        //Ahora pasamos a la extended data

//        val = DwgUtil.getBitShort(data, bitPos);

//        bitPos = ((Integer) val.get(0)).intValue();

//        int extendedDataSize = ((Integer) val.get(1)).intValue();

//        System.out.println("EED size="+extendedDataSize);

//        //como el size es 0, me lo salto

//

//        //ver si tiene datos graficos

//        val = DwgUtil.testBit(data, bitPos);

//        bitPos = ((Integer) val.get(0)).intValue();

//        boolean hasGraphicsData = ((Boolean) val.get(1))

//                .booleanValue();

//        System.out.println("graphics = "+hasGraphicsData);

//

//        //como se que no hay graphics me lo salto

//        //tama?o en bits

//        val = DwgUtil.getRawLong(data, bitPos);

//        bitPos = ((Integer) val.get(0)).intValue();

//        int sizeInBits = ((Integer) val.get(1)).intValue();

//        System.out.println("sizeInBits = "+sizeInBits);

//

//        /*

//         * Ahora, lo que viene es lo que en la spec se dice

//         * "Common entity data". Revisar bien pues PythonCAD no lo lee

//         * como en la spec.

//         *

//         * pag 42.

//          R13-R14 Only:

//          	RL	:	Size of object data in bits

//          	6B	:	Flags (FEDCBA)

//          	6B	:	Common parameters (CCSSII)

//          	Segun esto, deberia leer 6 bits y 6 bits

//

//          	FLAGS

//	      	Mas adelante (pag 43), dice:

//	      	DC	:	This is the number of reactors attached to an

//	      	entity as a bitshort.

//	      	This feature may have been dormant in R13,

//	      	but it appears in R14, and in files saved as R13 by R14.

//

//	      	Ahora bien, pythoncad las est? leyendo como bitLong

//          	?En que quedamos, son 2 bits, 1 bitLong o 1 bitShort?

//          	TODO REVISAR

//

//          	COMMON PARAMETERS

//          	Al principio, dice que son 6 bits (CC, SS, II)

//          	pero luego dice (pag 43):

//          	CC	:	Color bitshort

//          	SS	:	Linetype scale bitdouble

//          	II	:	"Invisible" flag bitshort

//

//			Pythoncad, en vez de como 2 bits, los est? leyendo

//			como BitShort, BitDouble y BitShort

//

//         * */

//

//        Integer mode = (Integer) DwgUtil.getBits(data, 2, bitPos);

//		bitPos += 2;

//		System.out.println("mode = "+mode);

//

//	/*

//		val = DwgUtil.getBitLong(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int rnum = ((Integer) val.get(1)).intValue();

//		System.out.println("numReactors = "+rnum);

//*/

//		val = DwgUtil.getBitShort(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int rnum = ((Integer) val.get(1)).intValue();

//		System.out.println("numReactors = "+rnum);

//

//

//		val = DwgUtil.testBit(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		boolean isLyrByLineType = ((Boolean) val.get(1)).booleanValue();

//		System.out.println("isLyrByLineType="+isLyrByLineType);

//

//		val = DwgUtil.testBit(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		boolean noLinks = ((Boolean) val.get(1)).booleanValue();

//		System.out.println("noLinks="+noLinks);

//

//

//		val = DwgUtil.getBitShort(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int color = ((Integer) val.get(1)).intValue();

//		System.out.println("color="+color);

//

//

//		val = DwgUtil.getBitDouble(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		float ltscale = ((Double) val.get(1)).floatValue();

//		System.out.println("ltscale="+ltscale);

//

//		val = DwgUtil.getBitShort(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int invis = ((Integer) val.get(1)).intValue();

//		System.out.println("invis="+invis);

//

//		val = DwgUtil.getBitShort(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int flag = ((Integer) val.get(1)).intValue();

//		System.out.println("flag="+flag);

//

//		double dVal = 0d;

//		if((flag & 0x4) > 0){

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			dVal = ((Double) val.get(1)).doubleValue();

//		}

//		System.out.println("constWidth="+dVal);

//

//		dVal = 0d;

//		if((flag & 0x8) > 0){

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			dVal = ((Double) val.get(1)).doubleValue();

//		}

//		System.out.println("elevation="+dVal);

//

//		dVal = 0d;

//		if ((flag & 0x2) > 0){

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			dVal = ((Double) val.get(1)).doubleValue();

//		}

//		System.out.println("thickness="+dVal);

//

//		double x, y, z ;

//		x = 0d;

//		y = 0d;

//		z = 0d;

//

//		if ((flag & 0x1) > 0){

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			x = ((Double) val.get(1)).doubleValue();

//

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			y = ((Double) val.get(1)).doubleValue();

//

//			val = DwgUtil.getBitDouble(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			z = ((Double) val.get(1)).doubleValue();

//		}

//		System.out.println("normal="+x+","+y+","+z);

//

//		val = DwgUtil.getBitLong(data, bitPos);

//		bitPos = ((Integer) val.get(0)).intValue();

//		int np = ((Integer) val.get(1)).intValue();

//		System.out.println("numPoints="+np);

//

//		int nb = 0;

//		if((flag & 0x10) > 0){

//			val = DwgUtil.getBitLong(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			nb = ((Integer) val.get(1)).intValue();

//		}

//		System.out.println("numBulges="+nb);

//		int nw = 0;

//		if((flag & 0x20) > 0){

//			val = DwgUtil.getBitLong(data, bitPos);

//			bitPos = ((Integer) val.get(0)).intValue();

//			nw = ((Integer) val.get(1)).intValue();

//		}

//		System.out.println("numWidths="+nw);

//		if(np > 0){

//			Point2D[] points = new Point2D[np];

//			for(int i = 0; i < np; i++){

//				val = DwgUtil.getRawDouble(data, bitPos);

//				bitPos = ((Integer) val.get(0)).intValue();

//				x = ((Double) val.get(1)).doubleValue();

//

//				val = DwgUtil.getRawDouble(data, bitPos);

//				bitPos = ((Integer) val.get(0)).intValue();

//				y = ((Double) val.get(1)).doubleValue();

//

//				points[i] = new Point2D.Double(x, y);

//				System.out.println("Punto"+i+"="+x+","+y);

//			}//for

//		}//if np

//

//		if(nb > 0){

//			double[] bulges = new double[nb];

//			for(int i = 0; i < nb; i++){

//				val = DwgUtil.getRawDouble(data, bitPos);

//				bitPos = ((Integer) val.get(0)).intValue();

//				bulges[i] = ((Double) val.get(1)).doubleValue();

//				System.out.println("Bulge"+i+"="+bulges[i]);

//			}//for

//

//		}//if nb

//

//		if(nw > 0){

//			double[][] widths = new double[nw][2];

//			for(int i = 0; i < nw; i++){

//				val = DwgUtil.getBitDouble(data, bitPos);

//				bitPos = ((Integer) val.get(0)).intValue();

//				double sw = ((Double) val.get(1)).doubleValue();

//

//				val = DwgUtil.getBitDouble(data, bitPos);

//				bitPos = ((Integer) val.get(0)).intValue();

//				double ew = ((Double) val.get(1)).doubleValue();

//

//				widths[i][0] = sw;

//				widths[i][1] = ew;

//				System.out.println("Width"+i+"="+sw+","+ew);

//			}//for

//		}

     }

	public void test3(){

		//test of extrusion

		double[] coord = null;

		double[] extrusion = null;

		double[] extrusion2 = new double[]{0, 0, 1};

		coord = new double[]{790089.65, 4477974.75, 9.560000000114087};

		extrusion = new double[]{-0.5037965987025721, 0.07005064807841195, 0.8609772899673451};

		//1. algoritmo original, vector normal distinto

//		double[] newCoord = AcadExtrusionCalculator.extrude(coord, extrusion);

//		newCoord = AcadExtrusionCalculator.extrude3(coord, extrusion);

//

		//2? ahora con vector normal coincidente con eje Z

//		newCoord = AcadExtrusionCalculator.extrude(coord, extrusion2);

//		newCoord = AcadExtrusionCalculator.extrude3(coord, extrusion2);

	}

}

		    GNU GENERAL PUBLIC LICENSE

		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.

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jdwglib Development Notes

Objetivos

- gvSIG debe leer ficheros en formato DWG

Alternativas

	Librer?as OpenDWG

		Ventajas

		- Soporte del formato DWG de la m?s alta calidad garantizado

		- Permite tanto lectura como escritura

		- Todas las versiones est?n soportadas

		- OpenDWG tiene gran capacidad de desarrollo

		Inconvenientes

		- Est? en C y es necesario un acceso JNI

		- Una empresa que de un uso comercial a gvSIG debe pagar a OpenDWG por sus

		  librer?as

		- Un usuario que no de un uso comercial a gvSIG debe mandar un contrato

		  firmado a la OpenDWG

		- OpenDWG puede decidir no facilitar sus librer?as

		- OpenDWG en la pr?ctica no tiene ninguna obligaci?n para con sus

		  usuarios

	Acceso v?a jython a la librer?a de DWG en Python de Art Haas

		Ventajas

		- M?xima reutilizaci?n de la librer?a original de Art Haas

		- Facilidad a la hora de incorporar nuevas versiones de la librer?a original

		Inconvenientes

		- Incremento muy muy considerable de la complejidad del c?digo

		- Ralentizaci?n de la librer?a

		- Grandes dificultades para realizar cambios en el c?digo

		- Es posible que Art no vaya a sacar nuevas versiones de esta librer?a

		- La librer?a de Art no est? orientada a objetos. La propia opini?n de Art es

		  que la mejor opci?n es el porting dotando a la nueva librer?a de orientaci?n

		  a objetos

	Port a Java de la librer?a de DWG en Python de Art Haas

		Ventajas

		- Desarrollo completo GPL

		- Lectura completa de ficheros DWG hasta la versi?n 2000

		- Si se publica la librer?a quiz? se logre la colaboraci?n de otros

		  desarrolladores

		- Art Haas no descarta la posibilidad de implementar la escritura de DWG

		Inconvenientes

		- Hoy por hoy no existe colaboraci?n en este sentido por parte de la

		  OpenDWG, ni por parte de Art Haas (desarrollador de la librer?a en python

		  de lectura de DWG)

		- La especificaci?n de la OpenDWG tiene errores que no piensan resolver

Cronolog?a

050308 - 050520 = 2 meses. Menos el tiempo empleado en el Proyecto del CAD y en

el de Felipe ... mes y medio.

050308 - 050316 --> Reparando bugs del modulo de CAD e investigando las

					alternativas para la lectura de DWG

050316 - 050321 --> Investigando las alternativas para la lectura de DWG. Intento

					de desarrollo seg?n la especificaci?n. Descubrimiento de la

					librer?a de Art

050321 - 050331 --> Probando la librer?a de Art. Probando el acceso v?a jython

050331 - 050408 --> Probando el acceso v?a jython y portando la librer?a a Java

					paralelamente. Correcci?n de bugs del CAD

050408 - 050425 --> Portando la librer?a a java y dotarla de orientaci?n a objectos.

					Correcci?n de bugs

050425 - 050510 --> Correcci?n de bugs. Gesti?n de polil?neas y bloques en el driver.

					Obtenci?n de nombres de capa y colores por capa

050510 - 050515 --> Corrigiendo bugs. Reestructurando la librer?a para que soporte

					la gesti?n que antes se hac?a en el driver

050515 - 050520 --> Corrigiendo bugs. Buscando ayuda para resolver estos bugs.

					Maqueando jdwglib v0.1 y su driver para gvSIG

Perspectivas

Mientras no cambie la pol?tica (y no creo que eso suceda) de la OpenDWG, la gesti?n de

informaci?n contenida en ficheros DWG a trav?s de su librer?a ser? propietaria y de

pago. La ventaja de su utilizaci?n es su potencia. Representa el camino r?pido y

sencillo

jdwglib se ajusta a los requisitos exijidos en el pliego para gvSIG y adem?s constituye

la primera librer?a libre de lectura de ficheros DWG en Java. Para lograr que la

lectura de DWG a trav?s de esta librer?a sea tan efectiva como la de DXF, tan solo

hay que solucionar los bugs conocidos. Para ello ser?a de gran ayuda la publicaci?n de

la librer?a y la colaboraci?n de la comunidad en el desarrollo. Sobre este tema habr?a

que discutir cuando es buen momento para la publicaci?n, puesto que esta librer?a podr?a

ser aprovechada por ProDevelop para mejorar su oferta de CAD

Con ayuda de la comunidad los objetivos pueden cumplirse en un plazo breve, quiz? un

mes. Sin ayuda, el proceso de depuraci?n de la librer?a puede prolongarse m?s y hasta

es posible que no se consigan eliminar todos los bugs

Supported features

Fomatos gr?ficos soportados

- Lectura del formato DWG de Autodesk

Versiones soportadas

- Versi?n 15 del formato DWG

Objectos gr?ficos soportados

- Arc

- Block

- Block Control

- Block Header

- Circle

- Endblk

- Insert

- Layer

- Layer Control

- Line

- Linear Dimension

- MText

- Point

- Polyline2D

- LwPolyline

- Seqend

- Solid

- Spline

- Text

- Vertex2D

- Ellipse

- Polyline3D

- Vertex3D

Otros elementos implementados

- bulges

- 3D

- Extrusiones

TODO List

- Inserci?n de bloques en 3D

- Completar la implementaci?n de todos los elementos dentro de bloques

- Attdef

- Attrib

- Thickness

- Aceleraci?n de la lectura

- Aceleraci?n de la gesti?n de elementos complejos

Known bugs

- Bugs concretos en el manejo de bloques

- LwPolylines  <-- FIXED 050524

- Layer handle "4 0" --> layer names, color by layer y bloques

- leve inclinaci?n an?mala y homogenea de los textos (quiz? relacionada con el ?ngulo

  de convergencia de las hojas) <-- FIXED 050527

- Bugs relacionados con polil?neas sin v?rtices

- Elementos fuera de sitio

- Elipses completas dentro de bloques

- Arcos de elipse

- Peque?os errores en arcos o polil?neas con bulges

Feature Request

- Lectura del formato DWG versi?n 13 y 14

- Lectura y escritura del formato DXF de Autodesk

- Escritura del formato DWG

jdwglib version history

This document lists the Change History of release versions of jdwglib

Version 0.1

Release Date: 20-05-2005

- Baseline version

Version 0.2

Release Date: 20-06-2005

- Block management (at Driver)

- 3D support

- Ellipse support

- Some bugs fixed

Version 0.3

Release Date: 06-09-2005

- Block management

- Some bugs fixed

jdwglib Technical Specifications

Overview

The Java DWG Library (jdwglib) is a Java libray designed for reading, handling and

writing drawing files in the Autodesk DWG format. This document is the design

specification for the classes, methods and algorithms implemented in the Java DWG

Library.

jdwglib has two different parts, first for DWG file accesing, and second for DWG file

handling. The part for accesing DWG files support the reading of DWG files and in

future versions we hope that writing of DWG files will be supported too. The part for

handling DWG files is designed for managing DWG complex objects like polylines or

blocks with the objective that the spatial position and the attributes of DWG objects

will be definitive and no one operation is required for obtaining the same results

that Autocad.

The detailed documentation of the class hierarchy and methods will be presented in the

form of JavaDoc for the source code.

Other resources

- Pythoncad DWG Library by Art Haas (www.pythoncad.org). The part of jdwglib that reads

  DWG files is a port of this library with an object oriented model added.

- The AutoCAD R13/R14/R2000 DWG File Specification by the OpenDWG Alliance. This is the

  public specification of the DWG format obtained using reverse engineering methods by

  the OpenDWG Alliance (www.opendwg.org).

Design goals

The design of jdwglib is intended to fulfil the following goals:

- jdwglib must return the definitive set of DWG objects. Geometric and

  non geometric attributes of these objects will be enough for its correct and complete

  representation.

- The jdwglib interface must be easy to use, even by someone that hasn't advanced

  CAD knowledge.

- jdwglib will be fast enough to be used in a production environment.

- The algorithms and code used in jdwglib will be clear and well-structured, to

  facilitate understanding by other developers.

Object model

The package javacad.util contains some general classes that are useful for handling

DWG objects and other objects in a GIS environment. Their use is described in the

JavaDoc documentation.

The package jdwglib contains the classes for reading and managing DWG files and its

objects. Their use is described in the JavaDoc documentation.

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