package com.ximple.io.dgn7;
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//~--- non-JDK imports --------------------------------------------------------
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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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/**
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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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public ArcElement(short[] 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] << 16 & 0xffff0000);
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angle += raw[19] & 0x0000ffff;
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return Utility.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 = Utility.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] << 16 & 0xffff0000);
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angle += raw[21] & 0x0000ffff;
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return Utility.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 = Utility.ConverRotatioToInt(value);
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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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short[] primary = new short[4];
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System.arraycopy(raw, 22, primary, 0, 4);
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return Utility.DGNToIEEEDouble(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 = Utility.IEEEDoubleToDGN(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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short[] secondary = new short[4];
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System.arraycopy(raw, 26, secondary, 0, 4);
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return Utility.DGNToIEEEDouble(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 = Utility.IEEEDoubleToDGN(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 Utility.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 = Utility.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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short[] x = new short[4];
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System.arraycopy(raw, 32, x, 0, 4);
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double dx = Utility.ConverUnitToCoord((int) Utility.DGNToIEEEDouble(x));
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short[] y = new short[4];
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System.arraycopy(raw, 36, y, 0, 4);
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double dy = Utility.ConverUnitToCoord((int) Utility.DGNToIEEEDouble(y));
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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 = Utility.ConverCoordToUnit(value.x);
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short[] x = Utility.IEEEDoubleToDGN(temp);
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System.arraycopy(x, 0, raw, 32, 4);
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temp = Utility.ConverCoordToUnit(value.y);
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short[] y = Utility.IEEEDoubleToDGN(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 temp = Math.abs(getStartAngle() - getSweepAngle());
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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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Coordinate[] result = new Coordinate[pts];
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double beta = -getRotationAngle() / 180 * Math.PI;
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double sinbeta = Math.sin(beta);
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double cosbeta = Math.cos(beta);
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double startAngle = getStartAngle();
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double endAngle = getSweepAngle();
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double steps = Math.abs(startAngle - endAngle) / pts;
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int i = 0;
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for (double current = startAngle; current < endAngle; current += steps)
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{
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if (i < pts)
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{
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Coordinate pt = new Coordinate();
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double alpha = current / 180 * Math.PI;
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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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result[i] = pt;
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i++;
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}
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}
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return result;
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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(short[] 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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