package cytoscape.visual.ui.editors.continuous;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;

import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import cytoscape.visual.VisualPropertyType;


/**
 * DOCUMENT ME!
 *
 * @author $author$
  */
public class YValueLegendPanel extends JPanel {
    private VisualPropertyType type;

    /**
     * Creates a new IconPanel object.
     *
     * @param type DOCUMENT ME!
     */
    public YValueLegendPanel(VisualPropertyType type) {
        this.type = type;
        this.setPreferredSize(new Dimension());
    }

    /**
     * DOCUMENT ME!
     *
     * @param g DOCUMENT ME!
     */
    public void paintComponent(Graphics g) {
        clear(g);

        Graphics2D g2d = (Graphics2D) g;

        //this.setPreferredSize(new Dimension(strW + 6, 1));
        int panelHeight = this.getHeight() - 30;

        Polygon poly = new Polygon();
        int top = 10;

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setStroke(new BasicStroke(1.0f));

        int center = this.getWidth() / 2 +4;

        poly.addPoint(center, top);
        poly.addPoint(center - 6, top + 15);
        poly.addPoint(center, top + 15);
        g.fillPolygon(poly);

        g2d.drawLine(center, top, center, panelHeight);
        g2d.setColor(Color.DARK_GRAY);
        g2d.setFont(new Font("SansSerif", Font.BOLD, 10));

        final String label = type.getName();
        final int width = SwingUtilities.computeStringWidth(
                g2d.getFontMetrics(),
                label);
        AffineTransform af = new AffineTransform();
        af.rotate(Math.PI + (Math.PI / 2));
        g2d.setTransform(af);
       
        g2d.setColor(Color.black);
        g2d.drawString(
            type.getName(),
            (-this.getHeight() / 2) - (width / 2),
            (this.getWidth() / 2)+5);

    }

    // super.paintComponent clears offscreen pixmap,
    // since we're using double buffering by default.
    protected void clear(Graphics g) {
        super.paintComponent(g);
    }
}