package com.webfoot.prefuse;



import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import prefuse.Constants;
import prefuse.render.AbstractShapeRenderer;
import prefuse.visual.VisualItem;

/*
 * This class renders bars like those you'd use in a bar chart.
 * Some code was borrowed from StackedAreaChart; some from ShapeRenderer.
 * 
 * @author <a href="http://webfoot.com/ducky.home.html">Kaitlin Duck Sherwood</a>
 * @author <a href="http://jheer.org">jeffrey heer</a>
 */
public class BarRenderer extends AbstractShapeRenderer {
	private Rectangle2D m_bounds;
	private boolean m_isVertical;
	private int m_orientation = Constants.ORIENT_BOTTOM_TOP;
	protected int m_barWidth = 10;
	protected Rectangle2D m_rect = new Rectangle2D.Double();

	public BarRenderer(int aWidth) {
		// super(barWidth);
		m_barWidth = aWidth;
		setOrientation(m_orientation);
	}

	public void setBounds(Rectangle2D bounds) {
		m_bounds = bounds;
	}

	/**
	 * Sets the orientation of this layout. Must be one of
	 * {@link Constants#ORIENT_BOTTOM_TOP} (to grow bottom-up),
	 * {@link Constants#ORIENT_TOP_BOTTOM} (to grow top-down),
	 * {@link Constants#ORIENT_LEFT_RIGHT} (to grow left-right), or
	 * {@link Constants#ORIENT_RIGHT_LEFT} (to grow right-left).
	 * @param orient the desired orientation of this layout
	 * @throws IllegalArgumentException if the orientation value
	 * is not a valid value
	 */

	public void setOrientation(int orient) {

		if ( orient != Constants.ORIENT_TOP_BOTTOM &&
				orient != Constants.ORIENT_BOTTOM_TOP &&
				orient != Constants.ORIENT_LEFT_RIGHT &&
				orient != Constants.ORIENT_RIGHT_LEFT) {
			throw new IllegalArgumentException(
					"Invalid orientation value: "+orient);
		}
		m_orientation = orient;
		m_isVertical   = (m_orientation == Constants.ORIENT_TOP_BOTTOM ||
				m_orientation == Constants.ORIENT_BOTTOM_TOP);
	}


	protected Shape getRawShape(VisualItem item) {
		double width, height;

		double x = item.getX();
		if ( Double.isNaN(x) || Double.isInfinite(x) )
			x = 0;
		double y = item.getY();
		if ( Double.isNaN(y) || Double.isInfinite(y) )
			y = 0;


		if(m_isVertical)
		{
			// @@@ what is the getSize for?
			width = m_barWidth*item.getSize();
			if(m_orientation == Constants.ORIENT_BOTTOM_TOP)
			{
				height = m_bounds.getMaxY() - y;
			} else {
				height = y;
				y = m_bounds.getMinY();
			}

			// Center the bar around the x-location
			if ( width > 1 ) {
				x = x-width/2;

			}
		} else {
			height = m_barWidth*item.getSize();
			if(m_orientation == Constants.ORIENT_LEFT_RIGHT)
			{
				width = x;
				x = m_bounds.getMinX();
			} else {
				width = m_bounds.getMaxX() - x;
			}

			// Center the bar around the y-location
			if ( height > 1 ) {
				y = y-height/2;
			}

		}

		m_rect.setFrame(x, y, width, height);
        return m_rect;

	}
	

    
}