package com.ximple.io.dgn7;
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import java.nio.ByteOrder;
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import java.util.ArrayList;
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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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* ArcElement
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*
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* @author Ulysses
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* @version 0.1
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* @since 2006/5/26 下午 06:41:45
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*/
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public class ArcElement extends Element implements GeometryConverter
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{
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private static final Logger logger = Logger.getLogger(ArcElement.class);
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public ArcElement(byte[] raw)
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{
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super(raw);
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}
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public double getStartAngle()
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{
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int angle = (raw[18] & 0x0000ffff) << 16 | (raw[19] & 0x0000ffff);
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return DgnUtility.converIntToRotation(angle);
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}
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public void setStartAngle(double value)
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{
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int angle = DgnUtility.converRotatioToInt(value);
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raw[18] = (short) (angle >>> 16 & 0x0000ffff);
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raw[19] = (short) (angle & 0x0000ffff);
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}
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public double getSweepAngle()
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{
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int angle = (raw[20] & 0x0000ffff) << 16 | (raw[21] & 0x0000ffff);
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if (angle < 0)
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angle = -1 * (angle & 0x7fffffff);
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return DgnUtility.converIntToRotation(angle);
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}
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public void setSweepAngle(double value)
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{
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int angle = DgnUtility.converRotatioToInt(value);
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if (angle < 0)
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{
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angle &= 0x7fffffff;
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angle |= 0x80000000;
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}
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raw[20] = (short) (angle >> 16 & 0x0000ffff);
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raw[21] = (short) (angle & 0x0000ffff);
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}
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public double getPrimary()
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{
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rawBuffer.position(22 * 2);
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ByteOrder bo = rawBuffer.order();
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rawBuffer.order(ByteOrder.BIG_ENDIAN);
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byte[] primary = new byte[8];
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rawBuffer.get(primary);
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rawBuffer.order(bo);
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return DgnUtility.convertDGNToIEEEDouble(primary) / 1000.0;
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}
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public void setPrimary(double value)
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{
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double temp = value * 1000.0;
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short[] primary = DgnUtility.convertIEEEDoubleToDGN(temp);
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System.arraycopy(primary, 0, raw, 22, 4);
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}
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public double getSecondary()
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{
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rawBuffer.position(26 * 2);
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ByteOrder bo = rawBuffer.order();
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rawBuffer.order(ByteOrder.BIG_ENDIAN);
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byte[] secondary = new byte[8];
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rawBuffer.get(secondary);
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rawBuffer.order(bo);
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return DgnUtility.convertDGNToIEEEDouble(secondary) / 1000.0;
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}
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public void setSecondary(double value)
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{
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double temp = value * 1000.0;
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short[] secondary = DgnUtility.convertIEEEDoubleToDGN(temp);
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System.arraycopy(secondary, 0, raw, 26, 4);
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}
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public double getRotationAngle()
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{
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int rotation = (raw[30] << 16 & 0xffff0000);
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rotation |= raw[31] & 0x0000ffff;
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return DgnUtility.converIntToRotation(rotation);
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}
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public void setRotationAngle(double value)
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{
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int angle = DgnUtility.converRotatioToInt(value);
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raw[30] = (short) (angle >> 16 & 0x0000ffff);
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raw[31] = (short) (angle & 0x0000ffff);
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}
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public Coordinate getOrigin()
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{
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rawBuffer.position(32 * 2);
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ByteOrder bo = rawBuffer.order();
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rawBuffer.order(ByteOrder.BIG_ENDIAN);
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byte[] rawValue = new byte[8];
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rawBuffer.get(rawValue); // x
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double dx = DgnUtility.converUnitToCoord(DgnUtility.convertDGNToIEEEDouble(rawValue));
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rawBuffer.get(rawValue); // y
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double dy = DgnUtility.converUnitToCoord(DgnUtility.convertDGNToIEEEDouble(rawValue));
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rawBuffer.order(bo);
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return new Coordinate(dx, dy);
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}
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public void setOrigin(Coordinate value)
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{
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double temp = DgnUtility.converCoordToUnit(value.x);
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short[] x = DgnUtility.convertIEEEDoubleToDGN(temp);
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System.arraycopy(x, 0, raw, 32, 4);
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temp = DgnUtility.converCoordToUnit(value.y);
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short[] y = DgnUtility.convertIEEEDoubleToDGN(temp);
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System.arraycopy(y, 0, raw, 36, 4);
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}
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public Geometry toGeometry(GeometryFactory factory)
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{
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double sweep = getSweepAngle();
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double temp = Math.abs(sweep);
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temp /= 4;
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int pts = (temp < 3) ? 3 : (int) temp;
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return factory.createLineString(convertToLineString(pts));
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}
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private Coordinate[] convertToLineString(int pts)
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{
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ArrayList<Coordinate> result = new ArrayList<Coordinate>();
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double beta = DgnUtility.converRotationToRadian(-getRotationAngle());
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double startAngle = getStartAngle();
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double sweepAngle = getSweepAngle();
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double endAngle = startAngle + sweepAngle;
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double steps = sweepAngle / pts;
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double current;
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if (sweepAngle < 0)
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{
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for (current = startAngle; current > endAngle; current += steps)
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{
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Coordinate pt = computePointOnArcByAngle(beta, current);
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result.add(pt);
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}
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} else
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{
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for (current = startAngle; current < endAngle; current += steps)
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{
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Coordinate pt = computePointOnArcByAngle(beta, current);
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result.add(pt);
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}
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}
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Coordinate pt = computePointOnArcByAngle(beta, endAngle);
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result.add(pt);
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return result.toArray(new Coordinate[result.size()]);
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}
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private Coordinate computePointOnArcByAngle(double beta, double current)
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{
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double sinbeta = Math.sin(beta);
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double cosbeta = Math.cos(beta);
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Coordinate pt = new Coordinate();
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double alpha = DgnUtility.converRotationToRadian(current);
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double sinalpha = Math.sin(alpha);
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double cosalpha = Math.cos(alpha);
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pt.x = getOrigin().x + (getPrimary() * cosalpha * cosbeta -
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getSecondary() * sinalpha * sinbeta);
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pt.y = getOrigin().y + (getPrimary() * cosalpha * sinbeta +
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getSecondary() * sinalpha * cosbeta);
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return pt;
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}
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public static class ElementHandler extends Element.ElementHandler
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{
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private static ElementHandler instance = null;
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public ElementHandler()
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{
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super(ElementType.ARC);
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}
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public static IElementHandler getInstance()
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{
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if (instance == null)
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{
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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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{
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return new ArcElement(raw);
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}
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}
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}
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