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Java > Open Source Codes > org > krysalis > barcode > impl > DefaultCanvasLogicHandler


1 /*
2  * $Id: DefaultCanvasLogicHandler.java,v 1.6 2003/06/11 09:25:12 jmaerki Exp $
3  * ============================================================================
4  * The Krysalis Patchy Software License, Version 1.1_01
5  * Copyright (c) 2002-2003 Nicola Ken Barozzi. All rights reserved.
6  *
7  * This Licence is compatible with the BSD licence as described and
8  * approved by http://www.opensource.org/, and is based on the
9  * Apache Software Licence Version 1.1.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  *
15  * 1. Redistributions of source code must retain the above copyright
16  * notice, this list of conditions and the following disclaimer.
17  *
18  * 2. Redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions and the following disclaimer in
20  * the documentation and/or other materials provided with the
21  * distribution.
22  *
23  * 3. The end-user documentation included with the redistribution,
24  * if any, must include the following acknowledgment:
25  * "This product includes software developed for project
26  * Krysalis (http://www.krysalis.org/)."
27  * Alternately, this acknowledgment may appear in the software itself,
28  * if and wherever such third-party acknowledgments normally appear.
29  *
30  * 4. The names "Krysalis" and "Nicola Ken Barozzi" and
31  * "Krysalis Barcode" must not be used to endorse or promote products
32  * derived from this software without prior written permission. For
33  * written permission, please contact nicolaken@krysalis.org.
34  *
35  * 5. Products derived from this software may not be called "Krysalis",
36  * "Krysalis Barcode", nor may "Krysalis" appear in their name,
37  * without prior written permission of Nicola Ken Barozzi.
38  *
39  * 6. This software may contain voluntary contributions made by many
40  * individuals, who decided to donate the code to this project in
41  * respect of this licence, and was originally created by
42  * Jeremias Maerki <jeremias@maerki.org>.
43  *
44  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
45  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
47  * DISCLAIMED. IN NO EVENT SHALL THE KRYSALIS PROJECT OR
48  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
49  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
50  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
51  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
52  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
53  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
54  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55  * SUCH DAMAGE.
56  * ====================================================================
57  */

58 package org.krysalis.barcode.impl;
59
60 import org.krysalis.barcode.BarGroup;
61 import org.krysalis.barcode.BarcodeDimension;
62 import org.krysalis.barcode.ClassicBarcodeLogicHandler;
63 import org.krysalis.barcode.HumanReadablePlacement;
64 import org.krysalis.barcode.output.Canvas;
65
66 /**
67  * Default Logic Handler implementation for painting on a Canvas.
68  *
69  * @author Jeremias Maerki
70  */

71 public class DefaultCanvasLogicHandler implements ClassicBarcodeLogicHandler {
72     
73     private GenericBarcodeImpl bcImpl;
74     private Canvas canvas;
75     private double x = 0.0;
76     private String JavaDoc msg;
77     private String JavaDoc lastgroup;
78     
79     /**
80      * Main constructor.
81      * @param bcImpl the barcode implementation class
82      * @param canvas the canvas to paint to
83      */

84     public DefaultCanvasLogicHandler(GenericBarcodeImpl bcImpl, Canvas canvas) {
85         this.bcImpl = bcImpl;
86         this.canvas = canvas;
87     }
88     
89     private double getStartX() {
90         if (bcImpl.hasQuietZone()) {
91             return bcImpl.getQuietZone();
92         } else {
93             return 0.0;
94         }
95     }
96
97     /** @see org.krysalis.barcode.ClassicBarcodeLogicHandler */
98     public void startBarcode(String JavaDoc msg) {
99         this.msg = msg;
100         //Calculate extents
101
BarcodeDimension dim = bcImpl.calcDimensions(msg);
102         
103         canvas.establishDimensions(dim);
104         x = getStartX();
105     }
106
107     /** @see org.krysalis.barcode.ClassicBarcodeLogicHandler */
108     public void startBarGroup(BarGroup type, String JavaDoc submsg) {
109         this.lastgroup = submsg;
110     }
111
112     /** @see org.krysalis.barcode.ClassicBarcodeLogicHandler */
113     public void addBar(boolean black, int width) {
114         final double w = bcImpl.getBarWidth(width);
115         if (black) {
116             if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
117                 canvas.drawRectWH(x, 0, w, bcImpl.getHeight());
118             } else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
119                 canvas.drawRectWH(x, bcImpl.getHumanReadableHeight(), w, bcImpl.getBarHeight());
120             } else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
121                 canvas.drawRectWH(x, 0, w, bcImpl.getBarHeight());
122             }
123         }
124         x += w;
125     }
126
127     /** @see org.krysalis.barcode.ClassicBarcodeLogicHandler */
128     public void endBarGroup() {
129     }
130
131     /** @see org.krysalis.barcode.ClassicBarcodeLogicHandler */
132     public void endBarcode() {
133         if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
134             //nop
135
} else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
136             bcImpl.drawCenteredText(canvas, msg, getStartX(), x, bcImpl.getHumanReadableHeight());
137         } else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
138             bcImpl.drawCenteredText(canvas, msg, getStartX(), x, bcImpl.getHeight());
139         }
140     }
141
142 }
143
144
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