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/*
 * @(#)VertexRenderer.java	1.0 03-JUL-04
 * 
 * Copyright (c) 2001-2004 Gaudenz Alder
 *  
 */
package org.jgraph.graph;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Map;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.UIManager;

import org.jgraph.JGraph;

/**
 * This renderer displays entries that implement the CellView interface and
 * supports the following attributes. If the cell view is not a leaf, this
 * object is only visible if it is selected.
 * GraphConstants.BOUNDS GraphConstants.ICON GraphConstants.FONT
 * GraphConstants.OPAQUE GraphConstants.BORDER GraphConstants.BORDERCOLOR
 * GraphConstants.LINEWIDTH GraphConstants.FOREGROUND GraphConstants.BACKGROUND
 * GraphConstants.VERTICAL_ALIGNMENT GraphConstants.HORIZONTAL_ALIGNMENT
 * GraphConstants.VERTICAL_TEXT_POSITION GraphConstants.HORIZONTAL_TEXT_POSITION
 * 
 * 
 * @version 1.0 1/1/02
 * @author Gaudenz Alder
 */

public class VertexRenderer extends JLabel implements CellViewRenderer,
		Serializable {

	/** Cache the current shape for drawing. */
	transient protected VertexView view;

	/** Cached hasFocus and selected value. */
	transient protected boolean hasFocus, selected, preview, childrenSelected;

	/** Cached default foreground and default background. */
	transient protected Color defaultForeground, defaultBackground,
			bordercolor;

	/** Cached borderwidth. */
	transient protected int borderWidth;

	/** Cached value of the double buffered state */
	transient protected boolean isDoubleBuffered = false;
	
	/** Cached value of whether the label is to be displayed */
	transient protected boolean labelEnabled;

	/**
	 * Caches values of the colors to be used for painting the cell. The
	 * values for gridColor, highlightColor and lockedHandleColor are updated
	 * with the respective values from JGraph in getRendererComponent each
	 * time a vertex is rendered. To render the selection border, the
	 * highlightColor or the lockedHandleColor are used depending on the
	 * focused state of the vertex. The gridColor is used to draw the
	 * selection border if any child cells are selected. To change these
	 * color values, please use the respective setters in JGraph.
	 */
	transient protected Color gradientColor = null, gridColor = Color.black,
			highlightColor = Color.black, lockedHandleColor = Color.black;

	/**
	 * Constructs a renderer that may be used to render vertices.
	 */
	public VertexRenderer() {
		defaultForeground = UIManager.getColor("Tree.textForeground");
		defaultBackground = UIManager.getColor("Tree.textBackground");
	}

	/**
	 * Configure and return the renderer component based on the passed in cell.
	 * The value is typically set from messaging the graph with
	 * convertValueToString. We recommend you check the value's
	 * class and throw an illegal argument exception if it's not correct.
	 * 
	 * @param graph
	 *            the graph that that defines the rendering context.
	 * @param view
	 *            the cell view that should be rendered.
	 * @param sel
	 *            whether the object is selected.
	 * @param focus
	 *            whether the object has the focus.
	 * @param preview
	 *            whether we are drawing a preview.
	 * @return the component used to render the value.
	 */
	public Component getRendererComponent(JGraph graph, CellView view,
			boolean sel, boolean focus, boolean preview) {
		gridColor = graph.getGridColor();
		highlightColor = graph.getHighlightColor();
		lockedHandleColor = graph.getLockedHandleColor();
		isDoubleBuffered = graph.isDoubleBuffered();
		if (view instanceof VertexView) {
			this.view = (VertexView) view;
			setComponentOrientation(graph.getComponentOrientation());
			if (graph.getEditingCell() != view.getCell()) {
				Object label = graph.convertValueToString(view);
				if (label != null)
					setText(label.toString());
				else
					setText(null);
			} else
				setText(null);
			this.hasFocus = focus;
			this.childrenSelected = graph.getSelectionModel()
					.isChildrenSelected(view.getCell());
			this.selected = sel;
			this.preview = preview;
			if (this.view.isLeaf()
					|| GraphConstants.isGroupOpaque(view.getAllAttributes()))
				installAttributes(view);
			else
				resetAttributes();
			return this;
		}
		return null;
	}

	/**
	 * Hook for subclassers that is invoked when the installAttributes is not
	 * called to reset all attributes to the defaults. 

	 * Subclassers must invoke the superclass implementation.
	 * 
	 */
	protected void resetAttributes() {
		setText(null);
		setBorder(null);
		setOpaque(false);
		setGradientColor(null);
		setIcon(null);
	}

	/**
	 * Install the attributes of specified cell in this renderer instance. This
	 * means, retrieve every published key from the cells hashtable and set
	 * global variables or superclass properties accordingly.
	 * 
	 * @param view
	 *            the cell view to retrieve the attribute values from.
	 */
	protected void installAttributes(CellView view) {
		Map map = view.getAllAttributes();
		setIcon(GraphConstants.getIcon(map));
		setOpaque(GraphConstants.isOpaque(map));
		setBorder(GraphConstants.getBorder(map));
		setVerticalAlignment(GraphConstants.getVerticalAlignment(map));
		setHorizontalAlignment(GraphConstants.getHorizontalAlignment(map));
		setVerticalTextPosition(GraphConstants.getVerticalTextPosition(map));
		setHorizontalTextPosition(GraphConstants.getHorizontalTextPosition(map));
		bordercolor = GraphConstants.getBorderColor(map);
		borderWidth = Math.max(1, Math.round(GraphConstants.getLineWidth(map)));
		if (getBorder() == null && bordercolor != null)
			setBorder(BorderFactory.createLineBorder(bordercolor, borderWidth));
		Color foreground = GraphConstants.getForeground(map);
		setForeground((foreground != null) ? foreground : defaultForeground);
		Color gradientColor = GraphConstants.getGradientColor(map);
		setGradientColor(gradientColor);
		Color background = GraphConstants.getBackground(map);
		setBackground((background != null) ? background : defaultBackground);
		setFont(GraphConstants.getFont(map));
		labelEnabled = GraphConstants.isLabelEnabled(map);
	}

	/**
	 * Paint the renderer. Overrides superclass paint to add specific painting.
	 */
	public void paint(Graphics g) {
		try {
			if (gradientColor != null && !preview && isOpaque()) {
				setOpaque(false);
				Graphics2D g2d = (Graphics2D) g;
				g2d.setPaint(new GradientPaint(0, 0, getBackground(),
						getWidth(), getHeight(), gradientColor, true));
				g2d.fillRect(0, 0, getWidth(), getHeight());
			}
			super.paint(g);
			paintSelectionBorder(g);
		} catch (IllegalArgumentException e) {
			// JDK Bug: Zero length string passed to TextLayout constructor
		}
	}

	/**
	 * Provided for subclassers to paint a selection border.
	 */
	protected void paintSelectionBorder(Graphics g) {
		Graphics2D g2 = (Graphics2D) g;
		Stroke previousStroke = g2.getStroke();
		g2.setStroke(GraphConstants.SELECTION_STROKE);
		if (childrenSelected || selected) {
			if (childrenSelected)
				g.setColor(gridColor);
			else if (hasFocus && selected)
				g.setColor(lockedHandleColor);
			else if (selected)
				g.setColor(highlightColor);
			Dimension d = getSize();
			g.drawRect(0, 0, d.width - 1, d.height - 1);
		}
		g2.setStroke(previousStroke);
	}

	/**
	 * Returns the intersection of the bounding rectangle and the straight line
	 * between the source and the specified point p. The specified point is
	 * expected not to intersect the bounds.
	 */
	public Point2D getPerimeterPoint(VertexView view, Point2D source, Point2D p) {
		Rectangle2D bounds = view.getBounds();
		double x = bounds.getX();
		double y = bounds.getY();
		double width = bounds.getWidth();
		double height = bounds.getHeight();
		double xCenter = x + width / 2;
		double yCenter = y + height / 2;
		double dx = p.getX() - xCenter; // Compute Angle
		double dy = p.getY() - yCenter;
		double alpha = Math.atan2(dy, dx);
		double xout = 0, yout = 0;
		double pi = Math.PI;
		double pi2 = Math.PI / 2.0;
		double beta = pi2 - alpha;
		double t = Math.atan2(height, width);
		if (alpha < -pi + t || alpha > pi - t) { // Left edge
			xout = x;
			yout = yCenter - width * Math.tan(alpha) / 2;
		} else if (alpha < -t) { // Top Edge
			yout = y;
			xout = xCenter - height * Math.tan(beta) / 2;
		} else if (alpha < t) { // Right Edge
			xout = x + width;
			yout = yCenter + width * Math.tan(alpha) / 2;
		} else { // Bottom Edge
			yout = y + height;
			xout = xCenter + height * Math.tan(beta) / 2;
		}
		return new Point2D.Double(xout, yout);
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void validate() {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void revalidate() {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void repaint(long tm, int x, int y, int width, int height) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void repaint(Rectangle r) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	protected void firePropertyChange(String propertyName, Object oldValue,
			Object newValue) {
		// Strings get interned...
		if (propertyName == "text")
			super.firePropertyChange(propertyName, oldValue, newValue);
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, byte oldValue,
			byte newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, char oldValue,
			char newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, short oldValue,
			short newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, int oldValue,
			int newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, long oldValue,
			long newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, float oldValue,
			float newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, double oldValue,
			double newValue) {
	}

	/**
	 * Overridden for performance reasons. See the Implementation Note  for more information.
	 */
	public void firePropertyChange(String propertyName, boolean oldValue,
			boolean newValue) {
	}

	/**
	 * @return Returns the gradientColor.
	 */
	public Color getGradientColor() {
		return gradientColor;
	}

	/**
	 * @param gradientColor
	 *            The gradientColor to set.
	 */
	public void setGradientColor(Color gradientColor) {
		this.gradientColor = gradientColor;
	}
}