LayerPanel.java

/*
 * Copyright 2013 Serdar.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.fub.agg2graphui;

import de.fub.agg2graphui.controller.AbstractLayer;
import de.fub.agg2graphui.layers.LayerEvent;
import de.fub.agg2graphui.layers.LayerListener;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;

/**
 *
 * @author Serdar
 */
public class LayerPanel extends javax.swing.JPanel implements LayerListener {

    private static final long serialVersionUID = 1L;
    private transient AbstractLayer<?> layer;

    /**
     * Creates new form LayerPanel
     */
    public LayerPanel() {
        initComponents();
        super.setOpaque(false);
    }

    public LayerPanel(AbstractLayer<?> layer) {
        this();
        setLayer(layer);
    }

    public final void setLayer(AbstractLayer<?> layer) {
        this.layer = layer;
        layer.addLayerListener(LayerPanel.this);
    }

    @Override
    public void setOpaque(boolean isOpaque) {
        super.setOpaque(false);
    }

    public BufferedImage getImage() {
        return (BufferedImage) (layer != null
                ? layer.getImage()
                : ((getWidth() > 0 && getHeight() > 0)
                ? createImage(getWidth(), getHeight()) : null));
    }

    public String getDescription() {
        return layer != null ? layer.getDescription() : null;
    }

    @Override
    public String getName() {
        return layer != null ? layer.getName() : super.getName();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        setPreferredSize(new java.awt.Dimension(0, 258));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 302, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 119, Short.MAX_VALUE)
        );
    }// </editor-fold>//GEN-END:initComponents

    // Variables declaration - do not modify//GEN-BEGIN:variables
    // End of variables declaration//GEN-END:variables
    @Override
    protected void paintComponent(Graphics g) {
        synchronized (getTreeLock()) {
            super.paintComponent(g); //To change body of generated methods, choose Tools | Templates.
            if (layer != null) {
                Graphics2D g2d = (Graphics2D) g;
                Dimension size = layer.getLayerManager().getSize();
                double scaleFactor = getWidth() / size.getWidth();
                g2d.scale(scaleFactor, scaleFactor);
                layer.paintLayer(g, new Rectangle(getSize()));
            }
        }
    }

    @Override
    public void requestRender(LayerEvent event) {
        if (layer == event.getSource()) {
            repaint();
        }
    }
}