svn-gvsig-desktop / tags / v2_0_0_Build_2055 / libraries / libFMap_geometries / src / org / gvsig / fmap / geom / primitive / Arc.java @ 38965
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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/*
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* AUTHORS (In addition to CIT):
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* 2009 {Iver T.I.} {Task}
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*/
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package org.gvsig.fmap.geom.primitive; |
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/**
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* <p>
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* This interface is equivalent to the GM_Arc specified in
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* <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=26012">ISO 19107</a>.
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* A Arc is defined by 3 points, and consists of the arc of the circle determined by the 3 points,
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* starting at the first, passing through the second and terminating at the third.
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* If the 3 points are co-linear, then the arc shall be a 3-point line string, and will
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* not be able to return values for center, radius, start angle and end angle.
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* </p>
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* @see <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=26012">ISO 19107</a>
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* @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>
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*/
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public interface Arc extends Curve { |
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/**
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* Sets the three points to define an arc.
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* These are three ordered points that belong to the arc
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* (none of them is the center of the ellipse/circle). Therefore
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* they must not be aligned.
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*
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* @param startPoint
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* The start point of an arc.
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* @param midPoint
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* The middle point of an arc.
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* @param endPoint
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* The end point of an arc.
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* @exception IllegalArgumentException if the three points are aligned or
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* there is a repeated point.
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*
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*/
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void setPoints(Point startPoint, Point midPoint, Point endPoint); |
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/**
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* Sets the values to define an arc.
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* @param center The center of the arc.
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* @param radius The radius.
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* @param startAngle The start angle of the arc (in radians)
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* @param angleExt The angular extent of the arc (in radians).
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*
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* The sign convention is:
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*
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* startAngle = 0 is "3 o'clock";
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* startAngle = (PI / 3) is "1 o'clock";
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* angleExt > 0 means "advancing clockwise";
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* angleExt < 0 means "advancing counterclockwise".
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*/
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void setPoints (Point center, double radius, double startAngle, double angleExt); |
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/**
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* Sets the values to define an arc.
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* @param center The center of the arc.
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* @param radius The radius.
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* @param startAngle The start angle of the arc (in radians)
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* @param angleExt The angular extent of the arc (in radians).
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*
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* The sign convention is:
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*
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* startAngle = 0 is "3 o'clock";
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* startAngle = (PI / 3) is "1 o'clock";
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* angleExt > 0 means "advancing clockwise";
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* angleExt < 0 means "advancing counterclockwise".
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*/
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void setPointsStartExt (Point center, double radius, double startAngle, double angleExt); |
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/**
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* Sets the values to define an arc. The arc will go from
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* startAngle to endAngle clockwise. Angles will be
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* normalized to ]-PI, PI] (-PI excluded) before creating
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* the arc.
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*
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* @param center The center of the arc.
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* @param radius The radius.
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* @param startAngle The start angle of the arc (in radians)
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* @param endAngle The end angle of the arc (in radians).
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*
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*/
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void setPointsStartEnd (Point center, double radius, double startAngle, double endAngle ); |
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/**
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* Return the first point that has been used to create the arc.
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* @return
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* The first point of the arc.
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*/
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Point getInitPoint();
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/**
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* Return the end point that has been used to create the arc.
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* @return
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* The end point of the arc.
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*/
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Point getEndPoint();
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/**
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* Return the center of the arc, that is, the center of the ellipse/circle
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* in which the arc is based.
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*
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* @return The center of the arc.
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*/
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Point getCenterPoint();
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} |