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A GWT library to access the SVG functionalities of web browsers
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/**********************************************
 * Copyright (C) 2010 Lukas Laag
 * This file is part of lib-gwt-svg.
 * 
 * libgwtsvg is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * libgwtsvg 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with libgwtsvg.  If not, see http://www.gnu.org/licenses/
 **********************************************/
/*
 * Copyright (c) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] 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.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.vectomatic.dom.svg.itf;

import org.vectomatic.dom.svg.OMSVGElement;
import org.vectomatic.dom.svg.OMSVGMatrix;
import org.vectomatic.dom.svg.OMSVGRect;

import com.google.gwt.core.client.JavaScriptException;

  /**
   * Interface {@link org.vectomatic.dom.svg.itf.ISVGLocatable} is for all elements
   * which either have a transform attribute or don't have a transform
   * attribute but whose content can have a bounding box in current user space.
   */
public interface ISVGLocatable {
  /**
   * The element which established the current viewport. Often, the nearest
   * ancestor svg element. Null if the current element is
   * the outermost svg element.
   */
  public OMSVGElement getNearestViewportElement();
  /**
   * The farthest ancestor svg element. Null if the current
   * element is the outermost svg element.
   */
  public OMSVGElement getFarthestViewportElement();
  /**
   * Returns the tight bounding box in current user space (i.e., after application
   * of the transform attribute, if any) on the geometry of all
   * contained graphics elements, exclusive of stroking, clipping, masking and
   * filter effects). Note that getBBox must return the actual bounding box
   * at the time the method was called, even in case the element has not yet
   * been rendered.
   * @return An {@link org.vectomatic.dom.svg.OMSVGRect} object that defines
   * the bounding box.
   */
  public OMSVGRect getBBox();
  /**
   * Returns the transformation matrix from current user units (i.e., after
   * application of the transform attribute, if any) to the viewport
   * coordinate system for the {@link org.vectomatic.dom.svg.itf.ISVGLocatable#getNearestViewportElement()}.
   * @return An {@link org.vectomatic.dom.svg.OMSVGMatrix} object that defines
   * the CTM.
   */
  public OMSVGMatrix getCTM();
  /**
   * Returns the transformation matrix from current user units (i.e., after
   * application of the transform attribute, if any) to the parent
   * user agent's notice of a "pixel". For display devices, ideally this represents
   * a physical screen pixel. For other devices or environments where physical
   * pixel sizes are not known, then an algorithm similar to the CSS2 definition
   * of a "pixel" can be used instead.  Note that null is returned if this element
   * is not hooked into the document tree. This method would have been more
   * aptly named as getClientCTM, but the name getScreenCTM
   * is kept for historical reasons.
   * @return An {@link org.vectomatic.dom.svg.OMSVGMatrix} object that defines
   * the given   transformation matrix.
   */
  public OMSVGMatrix getScreenCTM();
  /**
   * Returns the transformation matrix from the user coordinate system on the
   * current element (after application of the transform attribute,
   * if any) to the user coordinate system on parameter element (after
   * application of its transform attribute, if any).
   * @param element The target element.
   * @return An {@link org.vectomatic.dom.svg.OMSVGMatrix} object that defines
   * the transformation.
   * @throws SVGException(SVG_MATRIX_NOT_INVERTABLE) Raised if the currently
   * defined transformation matrices make it impossible to compute the   given
   * matrix (e.g., because one of the transformations is singular).
   */
  public OMSVGMatrix getTransformToElement(OMSVGElement element) throws JavaScriptException;
}