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/* 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

 */

package com.iver.cit.gvsig.fmap.core.symbols;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.awt.geom.AffineTransform;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.core.FShape;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.core.IPrintable;

import com.iver.utiles.IPersistence;

import com.iver.utiles.XMLEntity;

import com.iver.utiles.swing.threads.Cancellable;

/**

 *

 * Interface for symbols.It is the most general one which is implemented by other

 * specific symbols.For this reason this interface has a method to obtain the derived

 * version of a common symbol(apart from others). The main purpose is to offer a set of

 * symbols that will be part of the FMap kernel and allow the developer to add new symbols

 * without changes in the initial implementation.

 *

 *

 * @author   jaume dominguez faus - jaume.dominguez@iver.es

 */

public interface ISymbol extends IPersistence, IPrintable {

        public static Color SELECTION_COLOR = Color.YELLOW;

        /**

         * Returns the derived version of the symbol that will be used to draw the

         * feature when it is selected.

         * @return <b>ISymbol</b> applied to a feature when it has been selected.

         */

        public ISymbol getSymbolForSelection();

        /**

         * Used when a symbol is going to be drawn.The method to do

         * it will depend on the derived version of the symbol.

         * @param g

         * @param affineTransform

         * @param shp

         * @param cancel TODO

         */

        public void draw(Graphics2D g, AffineTransform affineTransform, FShape shp, Cancellable cancel);

        /**

         * <p>

         * Returns <b>the distance between the shape's bounding box and the 

         * symbol-that-represents-this-shape's bounding box</b> in a two-length-float

         * array passed as parameter.<br>

         * </p>

         * <p>

         * After this method returns, the float array passed will contain two values

         * representing <b>the amount of pixels</b> separating each of the X (first element)

         * and Y (second element) axes.<br>

         * </p>

         * <p>

         * This distance maybe dependent on:

         *         <ol>

         *                 <li>

         *                         <b>The ViewPort</b>: if the symbol is an instance of CartographicSupport

         *                         the units it uses are not pixels and the reference system is 

         *                         CarthographicSupport.WORLD.

         *                 </li>

         *                 <li>

         *                         <b>The target rendering context's dpi (dots-per-inch)</b>: if the symbol

         *                         is an instance of CartographicSupport the units it uses are not pixels and

         *                         CarthographicSupport.PAPER.

         *                 </li>

         *         </ol>

         * <br>

         * </p>

         * <p>

         * And in any other case, if the unit of the symbol is pixels or the symbol is not

         * even an instance of CartographicSupport, the returning values are only

         * defined by the symbol and are not calculated.

         * </p>

         * @param ViewPort viewPort

         * @param Shape shp

         * @param int dpi

         * @param float[] distances, the array of floats where to store the distances in x and y axis

         */

        public void getPixExtentPlus(FShape shp, float[] distances, ViewPort viewPort, int dpi);

        /**

         * Returns the rgb of the symbol when it is drawn like a point.

         *

         * @return rgb of the symbol.

         */

        public int getOnePointRgb();

        /**

         * Allows the symbol to be persisted during sessions.With this method, the symbol is

         * automatically described to be integrated as a part of the project file.Use it to

         * specify how do you want to write the symbol in .gvp project

         * @return

         */

        public XMLEntity getXMLEntity();

        /**

         * Called by the factory, this method will set up the symbol and after call it, the

         * symbol must be fully functional and ready to be used.

         */

        public void setXMLEntity(XMLEntity xml);

        /**

         * The description is a human-readable text used to label it when show in a symbol menu or something like that.

         * @return   description of this symbol.

         * @uml.property  name="description"

         */

        public String getDescription();

        /**

         * Tells whether the shape of the symbol will be drawn or not.

         *

         * @return <b>true</b> if Shape must be drawn. Useful if you are labelling

         */

        public boolean isShapeVisible();

        /**

         * Sets the description of this symbol

         * @param   desc, a string with the description

         * @see   ISymbol.getDescription();

         * @uml.property  name="description"

         */

        public void setDescription(String desc);

        /**

         * The use of this method -and its mechanism- is being valorated. It probably

         * will be <b>deprecated</b>.

         * @return FSymbol constants. I think it is better to use isSuitableFor

         *

         */

        public int getSymbolType();

        /**

         * True if this symbol is ok for the geometry. For example, a FillSymbol will

         * be suitable for a Polygon.

         * @param geom

         * @return

         */

        public boolean isSuitableFor(IGeometry geom);

        /**

         * Useful to render the symbol inside the TOC, or inside little

         * rectangles. For example, think about rendering a Label with size

         * in meters => You will need to specify a size in pixels.

         * Of course, you can also to choose to render a prepared image, etc.

         * @param g2

         * @param scaleInstance

         * @param r

         * @throws SymbolDrawingException TODO

         */

        public void drawInsideRectangle(Graphics2D g, AffineTransform scaleInstance, Rectangle r) throws SymbolDrawingException;

}