package causation.lab;

import javax.swing.*;
import java.awt.*;

/**
 * This class displays an experimental setup.
 *
 * @see	IndepInternalFrame
 * @version	0.9	Aug 18, 1999
 * @author	David Danks
 */

public class ExpSetupDisplay extends JComponent {

/////////////////// Static Class Variables ///////////////////
	private static final String TEXT = "Experimental Setup";
	private static final int LINE_THICKNESS = 3;
	private static final int LINE_SPACING = 5;
	private static final Color LABEL = new Color(102, 102, 102);
	private static final Color BACKGROUND = Color.white;
	private static final Font FONT = new Font("Dialog", Font.BOLD, 14);
	private static final Insets MARGIN = new Insets(10, 10, 10, 10);

/////////////////// Instance Variables ///////////////////
	private Image display;

/////////////////// Constructors ///////////////////
/**
 * This creates an ExpSetupDisplay with the given Image
 * @param	im	The Image to display
 */
	public ExpSetupDisplay(Image im) {
		display = im;
		setFont(FONT);
	}
	
/////////////////// Instance Methods ///////////////////
/**
 * @return	The preferred size of this ExpSetupDisplay
 */
	public Dimension getPreferredSize() {
		FontMetrics fm = getFontMetrics(getFont());
		int width = 0; int height = 0;
		// account for text
		width = Math.max(width, fm.stringWidth(TEXT));
		height += fm.getHeight();
		// account for line
		height += 2*LINE_SPACING+LINE_THICKNESS;
		// account for image
		width = Math.max(width, display.getWidth(this));
		height += display.getHeight(this);
		// account for borders
		width += MARGIN.left+MARGIN.right;
		height += MARGIN.top+MARGIN.bottom;
		return new Dimension(width, height);
	}
/**
 * @return	The minimum size of the ExpSetupDisplay (=preferred size)
 */	
	public Dimension getMinimumSize() { return getPreferredSize(); }

/**
 * @return	<code>true</code>, since we paint the background
 */
	public boolean isOpaque() { return true; }
/**
 * Does the painting of the display.
 * @param	g	The Graphics context in which to paint the ExpSetupDisplay
 */
	public void paintComponent(Graphics g) {
		FontMetrics fm = getFontMetrics(getFont());
		// fill in the background
		g.setColor(BACKGROUND);
		g.fillRect(0, 0, getWidth(), getHeight());
		// draw the label
		g.setColor(LABEL);
		int xInset = (getWidth()-fm.stringWidth(TEXT))/2;
		g.drawString(TEXT, xInset, MARGIN.top+fm.getAscent());
		// draw the line
		int yOffset = MARGIN.top+fm.getHeight()+LINE_SPACING;
		for (int i=0; i<LINE_THICKNESS; i++) {
			g.drawLine(0, yOffset+i, getWidth(), yOffset+i);
		}
		yOffset += LINE_THICKNESS+LINE_SPACING;
		// draw the image
		xInset = (getWidth()-display.getWidth(this))/2;
		g.drawImage(display, xInset, yOffset, this);
	}
}