TestPanelJ2D.java

/*******************************************************************************
 * Copyright (c) 2013, Daniel Murphy All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met: * Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following disclaimer. * Redistributions
 * in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
package org.jbox2d.testbed.framework.j2d;

import java.awt.AWTError;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JPanel;

import org.jbox2d.testbed.framework.AbstractTestbedController;
import org.jbox2d.testbed.framework.TestbedModel;
import org.jbox2d.testbed.framework.TestbedPanel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Daniel Murphy
 */
@SuppressWarnings("serial")
public class TestPanelJ2D extends JPanel implements TestbedPanel {
  private static final Logger log = LoggerFactory.getLogger(TestPanelJ2D.class);

  public static final int SCREEN_DRAG_BUTTON = 3;

  public static final int INIT_WIDTH = 600;
  public static final int INIT_HEIGHT = 600;

  private Graphics2D dbg = null;
  private Image dbImage = null;

  private int panelWidth;
  private int panelHeight;

  private final AbstractTestbedController controller;

  public TestPanelJ2D(final TestbedModel model, final AbstractTestbedController controller) {
    this.controller = controller;
    setBackground(Color.black);
    setPreferredSize(new Dimension(INIT_WIDTH, INIT_HEIGHT));
    updateSize(INIT_WIDTH, INIT_HEIGHT);

    AWTPanelHelper.addHelpAndPanelListeners(this, model, controller, SCREEN_DRAG_BUTTON);
    addComponentListener(new ComponentAdapter() {
      @Override
      public void componentResized(ComponentEvent e) {
        updateSize(getWidth(), getHeight());
        dbImage = null;
      }
    });
  }

  public Graphics2D getDBGraphics() {
    return dbg;
  }

  private void updateSize(int width, int height) {
    panelWidth = width;
    panelHeight = height;
    controller.updateExtents(width / 2, height / 2);
  }

  public boolean render() {
    if (dbImage == null) {
      log.debug("dbImage is null, creating a new one");
      if (panelWidth <= 0 || panelHeight <= 0) {
        return false;
      }
      dbImage = createImage(panelWidth, panelHeight);
      if (dbImage == null) {
        log.error("dbImage is still null, ignoring render call");
        return false;
      }
      dbg = (Graphics2D) dbImage.getGraphics();
      dbg.setFont(new Font("Courier New", Font.PLAIN, 12));
    }
    dbg.setColor(Color.black);
    dbg.fillRect(0, 0, panelWidth, panelHeight);
    return true;
  }

  public void paintScreen() {
    try {
      Graphics g = this.getGraphics();
      if ((g != null) && dbImage != null) {
        g.drawImage(dbImage, 0, 0, null);
        Toolkit.getDefaultToolkit().sync();
        g.dispose();
      }
    } catch (AWTError e) {
      log.error("Graphics context error", e);
    }
  }
}