package com.ximple.io.dgn7;
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//~--- non-JDK imports --------------------------------------------------------
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import org.apache.log4j.Logger;
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import com.vividsolutions.jts.geom.Coordinate;
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import com.vividsolutions.jts.geom.Geometry;
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import com.vividsolutions.jts.geom.GeometryFactory;
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import com.ximple.util.DgnUtility;
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/**
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* LineElement
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*
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* @author Ulysses
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* @version 0.1
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* @since 2006/5/18 �W�� 11:34:59
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*/
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public class LineElement extends Element implements GeometryConverter {
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private static final Logger logger = Logger.getLogger(LineElement.class);
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LineElement(byte[] raw) {
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super(raw);
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}
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public Coordinate getCentroid(double dTolerance) {
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return null;
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}
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public Coordinate getEndPoint() {
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int endX = ((raw[22] << 16) & 0xffff0000) | (raw[23] & 0x0000ffff);
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int endY = ((raw[24] << 16) & 0xffff0000) | (raw[25] & 0x0000ffff);
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double x = DgnUtility.converUnitToCoord(endX);
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double y = DgnUtility.converUnitToCoord(endY);
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return new Coordinate(x, y);
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}
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public Coordinate getNormal() {
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return null;
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}
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public Coordinate getOrigin() {
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return null;
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}
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public Coordinate getStartPoint() {
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int startX = ((raw[18] << 16) & 0xffff0000);
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startX = startX + (raw[19] & 0x0000ffff);
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double x = DgnUtility.converUnitToCoord(startX);
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int startY = ((raw[20] << 16) & 0xffff0000);
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startY = startY + (raw[21] & 0x0000ffff);
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double y = DgnUtility.converUnitToCoord(startY);
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return new Coordinate(x, y);
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}
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public Coordinate getVertex(int index) {
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return (index == 0)
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? getStartPoint()
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: getEndPoint();
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}
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public double getLength() {
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Coordinate p1 = getStartPoint();
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Coordinate p2 = getEndPoint();
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return DgnUtility.getLength(p1.x, p1.y, p2.x, p2.y);
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}
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public Coordinate pointAtDistance(double dDistance, double dTolerance) {
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return null;
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}
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public Coordinate[] getVertices() {
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Coordinate[] result = new Coordinate[2];
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result[0] = getStartPoint();
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result[1] = getEndPoint();
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return result;
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}
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public Geometry toGeometry(GeometryFactory factory) {
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return factory.createLineString(getVertices());
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}
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public static class ElementHandler extends Element.ElementHandler {
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private static ElementHandler instance = null;
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public ElementHandler() {
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super(ElementType.LINE);
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}
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public static IElementHandler getInstance() {
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if (instance == null) {
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instance = new ElementHandler();
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}
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return instance;
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}
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protected Element createElement(byte[] raw) {
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return new LineElement(raw);
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}
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}
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}
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