/*   
ArrwDecor.java
 *    
 *    Copyright (c) 2000, Ted Nelson and Tuomas Lukka
 *
 *    You may use and distribute under the terms of either the GNU Lesser
 *    General Public License, either version 2 of the license or,
 *    at your choice, any later version. Alternatively, you may use and
 *    distribute under the terms of the XPL.
 *
 *    See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of 
 *    the licenses.
 *
 *    This software is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the README
 *    file for more details.
 *
 */
/*
 * Written by Tuomas Lukka
 */
 
package org.gzigzag;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

/** Arrows.
 */

public class ArrowDecor extends CoordDecor {
public static final String rcsid = "$Id: ArrowDecor.java,v 1.4 2000/10/26 18:09:29 tjl Exp $";
    public static final boolean dbg = false;
    static final void p(String s) { if(dbg) System.out.println(s); }
    static final void pa(String s) { System.out.println(s); }

    Color color;

    /** A simple class that knows how to efficiently build
     * ArrowDecors.
     */
    static public class Builder extends CoordDecor.Builder {
	Color col;
	public Builder(FlobSet into, Color col) {
	    super(into);
	    this.col = col;
	}
	/** Make a line.
	 */
	public final void ar(int x0, int y0, int x1, int y1) {
	    makeRoom(4);
	    p[curp] = x0;
	    p[curp+1] = y0;
	    p[curp+2] = x1;
	    p[curp+3] = y1;
	    curp += 4;
	}
	protected Renderable create() {
	    return new ArrowDecor(p, np, col, d);
	}

    }

    public ArrowDecor(int[] coords, int n, int d) {
	this(coords, n, null, d);
    }

    /** Usual constructor.
     * @param coords The coordinates for the lines, given as
     *  	     quadruplets x1, y1, x2, y2.
     */
    public ArrowDecor(int[] coords, int n, Color color, int d) {
	super(coords, n, d);
	this.color = color;
    }

    public ArrowDecor(int x1, int y1, int x2, int y2, Color color, int d) {
	super(null, 4, d);
	this.coords = new int[] {
	    x1, y1, x2, y2
	};
	this.color = color;
	this.d = d;
    }

    public void render(Graphics g) {
	Color old = null;
	if(color != null) {
	    old = g.getColor();
	    g.setColor(color);
	}

	for(int i=0; i+3<n; i+=4) {
	    int x1 = coords[i]; int y1=coords[i+1];
	    int x2 = coords[i+2]; int y2=coords[i+3];

	    int dx = x2 - x1;
	    int dy = y2 - y1;
	    int ox = -dy;
	    int oy = dx;
	    int [] x = new int[] {
		x1 + ox/3 - dx/3,
		x1 + ox/6 + (3*dx)/5, 
		x1 + ox/2 + (2*dx)/5, 
		x1 + dx, 
		x1 - ox/2 + (2*dx)/5, 
		x1 - ox/6 + (3*dx)/5, 
		x1 - ox/3 - dx/3,
		x1
	    };
	    int [] y = new int[] {
		y1 + oy/3 - dy/3,
		y1 + oy/6 + (3*dy)/5, 
		y1 + oy/2 + (2*dy)/5, 
		y1 + dy, 
		y1 - oy/2 + (2*dy)/5, 
		y1 - oy/6 + (3*dy)/5, 
		y1 - oy/3 - dy/3,
		y1
	    };
	    Color c = g.getColor();
	    g.setColor(color);
	    g.fillPolygon(x, y, x.length);
	    g.setColor(c);
	    g.drawPolyline(x, y, x.length-1);

	}

	if(old != null)
	    g.setColor(old);
    }

}