ini/trakem2/display/AbstractOffscreenThread.java

   1 /**
   2
   3 TrakEM2 plugin for ImageJ(C).
   4 Copyright (C) 2007 Albert Cardona and Rodney Douglas.
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation (http://www.gnu.org/licenses/gpl.txt )
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 You may contact Albert Cardona at acardona at ini.phys.ethz.ch
  20 Institute of Neuroinformatics, University of Zurich / ETH, Switzerland.
  21 **/
  22
  23 package ini.trakem2.display;
  24
  25 import java.util.concurrent.atomic.AtomicBoolean;
  26 import ini.trakem2.utils.IJError;
  27
  28 /** To be used in combination with the AbstractRepaintThread, as a thread to create graphics offscreen.*/
  29 public abstract class AbstractOffscreenThread extends Thread {
  30
  31         protected RepaintProperties rp = null;
  32         private AtomicBoolean mustRepaint = new AtomicBoolean(false);
  33
  34         AbstractOffscreenThread(String name) {
  35                 super(name);
  36                 setPriority(Thread.NORM_PRIORITY);
  37                 try { setDaemon(true); } catch (Exception e) { e.printStackTrace(); }
  38                 start();
  39         }
  40
  41         public void setProperties(final RepaintProperties rp) {
  42                 synchronized (this) {
  43                         this.rp = rp;
  44                         this.mustRepaint.set(true);
  45                         notify();
  46                 }
  47         }
  48
  49         public void run() {
  50                 while (!isInterrupted()) {
  51                         try {
  52                                 if (mustRepaint.getAndSet(false)) {
  53                                         paint();
  54                                 } else {
  55                                         synchronized (this) {
  56                                                 try { wait(); } catch (InterruptedException ie) {}
  57                                         }
  58                                 }
  59                         } catch (Exception e) {
  60                                 IJError.print(e);
  61                         }
  62                 }
  63         }
  64
  65         public void waitOnRepaintCycle() {
  66                 while (mustRepaint.get()) {
  67                         try { Thread.sleep(500); } catch (InterruptedException ie) {}
  68                 }
  69         }
  70
  71         public abstract void paint();
  72
  73         protected interface RepaintProperties {}
  74
  75 }