001package org.vishia.gral.ifc;
002
003/**This interface is used to free-draw on a canvas area. It is implemented by the 
004 * {@link GralCanvasStorage} and by implementation classes.
005 * @author Hartmut Schorrig
006 *
007 */
008public interface GralCanvas_ifc
009{
010
011  
012  /**Version and history:
013   * <ul>
014   * <li>2011-11-01 Created. It is necessary to build common use-able widgets on gral level,
015   *   it may be usefully to draw and paint on user level. Therefore this universal interface is need.
016   * </ul>
017  /**Version, history and license.
018   * <ul>
019   * <li>2011-06-00 Hartmut created
020   * </ul>
021   * 
022   * <b>Copyright/Copyleft</b>:<br>
023   * For this source the LGPL Lesser General Public License,
024   * published by the Free Software Foundation is valid.
025   * It means:
026   * <ol>
027   * <li> You can use this source without any restriction for any desired purpose.
028   * <li> You can redistribute copies of this source to everybody.
029   * <li> Every user of this source, also the user of redistribute copies
030   *    with or without payment, must accept this license for further using.
031   * <li> But the LPGL is not appropriate for a whole software product,
032   *    if this source is only a part of them. It means, the user
033   *    must publish this part of source,
034   *    but doesn't need to publish the whole source of the own product.
035   * <li> You can study and modify (improve) this source
036   *    for own using or for redistribution, but you have to license the
037   *    modified sources likewise under this LGPL Lesser General Public License.
038   *    You mustn't delete this Copyright/Copyleft inscription in this source file.
039   * </ol>
040   * If you intent to use this source without publishing its usage, you can get
041   * a second license subscribing a special contract with the author. 
042   * 
043   * @author Hartmut Schorrig = hartmut.schorrig@vishia.de
044   */
045  public static final int version = 20111101;
046  
047  
048  /**Accepts a order to draw a line. The coordinates are stored only. 
049   * This method can be called in any thread. It is thread-safe.
050   * @param color
051   * @param x1 TODO yet it is pixel coordinates, use GralGrid coordinates.
052   * @param y1
053   * @param x2
054   * @param y2
055   */
056  public void drawLine(GralColor color, int x1, int y1, int x2, int y2);
057
058  
059  public void drawImage(GralImageBase image, int x, int y, int dx, int dy, GralRectangle imagePixelSize);
060  
061  
062  public void setTextStyle(GralColor color, GralFont font, int origin);
063  
064  public void drawText(String text);
065
066  
067}