Screen.java

/*******************************************************************************
 * Copyright (c) 2012-present Jakub Kováč, Jozef Brandýs, Katarína Kotrlová,
 * Pavol Lukča, Ladislav Pápay, Viktor Tomkovič, Tatiana Tóthová
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package algvis.ui;

import algvis.core.DataStructure;
import algvis.ui.view.View;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ConcurrentModificationException;

import javax.swing.JPanel;
import javax.swing.Timer;

public class Screen extends JPanel {
    private static final long serialVersionUID = -8279768206774288161L;
    // obrazovka (ak nie je suspendnuta) neustale vykresluje poziciu
    private final Timer timer;
    private DataStructure D = null;
    private final VisPanel panel;

    private Image I;
    private Graphics G;
    private Dimension size = new Dimension(0, 0);

    public final View V;

    public Screen(VisPanel panel) {
        this.panel = panel;
        V = new View(this);
        timer = new Timer(50, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent evt) {
                repaint();
            }
        });
    }

    public void setDS(DataStructure D) {
        this.D = D;
    }

    void check_size() {
        final Dimension d = getSize();
        if (I == null || d.width != size.width || d.height != size.height) {
            I = createImage(d.width, d.height);
            G = I.getGraphics();
            V.setGraphics((Graphics2D) G, d.width, d.height);
            size = d;
        }
    }

    void clear() {
        G.setColor(Color.white);
        G.fillRect(0, 0, size.width, size.height);
    }

    @Override
    public void paintComponent(Graphics g) {
        check_size();
        clear();
        if (D != null) {
            V.startDrawing();
            try {
                panel.scene.move();
                panel.scene.draw(V);
            } catch (final ConcurrentModificationException ignored) {
            }
            V.endDrawing();
            // V.resetView();
        } else {
            System.err.println("[DS null !]");
        }
        g.drawImage(I, 0, 0, null);
    }

    public void suspend() {
        timer.stop();
    }

    public void resume() {
        timer.start();
    }

    public void start() {
        timer.start();
    }
}