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Java/flob/ArrowDecor.java

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+/*   
+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);
+    }
+
+}