Android Open Source - LogAcceleration Canvas Thread

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
  This file is part of LogAcceleration./*from  w  ww .ja  v a 2  s .  c  om*/

    LogAcceleration 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 3 of the License, or
    (at your option) any later version.

    LogAcceleration 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 LogAcceleration.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.tntexplosivesltd.acceleration;

import android.graphics.Canvas;
import android.view.SurfaceHolder;

/**
 * @brief Handles thread for drawing on the canvas.
 */
public class CanvasThread extends Thread {
  private SurfaceHolder _surface_holder;
  private Panel _panel;
  private boolean _run = false;
  
  /**
   * @brief Constructor for the CanvasThread class.
   * @param holder SurfaceHolder that we can get a canvas from.
   * @param panel Instance of Panel class to pass the canvas to.
   */
  public CanvasThread(SurfaceHolder holder, Panel panel)
  {
    _surface_holder = holder;
    _panel = panel;
  }
  
  /**
   * @brief Sets whether the canvas drawing thread is running or not.
   * @param run Whether the thread is running.
   */
  public void set_running(boolean run)
  {
    _run = run;
  }
  
  /**
   * @brief Retrieves whether or not the drawing thread is running.
   * @return Set whether or not to draw the graphs on the canvas.
   */
  public boolean is_running()
  {
    return _run;
  }
  
  /**
   * @brief Override method that is used my the thread.
   * @details What to do when the thread runs. While the thread is running, it draws on the canvas. Otherwise, it unlocks and tidies up.
   */
  @Override
  public void run()
  {
    Canvas c;
    while (_run)
    {
      c = null;
      try
      {
        c = _surface_holder.lockCanvas(null);
        synchronized (_surface_holder)
        {
          _panel.onDraw(c);
        }
      }
      finally
      {
        if (c != null)
        {
          _surface_holder.unlockCanvasAndPost(c);
        }
      }
    }
  }
}

Java Source Code List

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