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


1 /*
2  * $Id: DefaultHeightVariableLogicHandler.java,v 1.1 2003/08/18 19:15:33 jmaerki Exp $
3  * ============================================================================
4  * The Krysalis Patchy Software License, Version 1.1_01
5  * Copyright (c) 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.BaselineAlignment;
63 import org.krysalis.barcode.ClassicBarcodeLogicHandler;
64 import org.krysalis.barcode.HumanReadablePlacement;
65 import org.krysalis.barcode.output.Canvas;
66
67 /**
68  * Logic Handler to be used by subclasses of HeightVariableBarcodeImpl
69  * for painting on a Canvas.
70  *
71  * @author Chris Dolphy
72  */
73 public class DefaultHeightVariableLogicHandler
74             implements ClassicBarcodeLogicHandler {
75
76
77     private HeightVariableBarcodeImpl bcImpl;
78     private Canvas canvas;
79     private double x = 0.0;
80     //private int baselinePos;
81 private String JavaDoc msg;
82
83     /**
84      * Constructor
85      * @param bcImpl the barcode implementation class
86      * @param canvas the canvas to paint to
87      */
88     public DefaultHeightVariableLogicHandler(HeightVariableBarcodeImpl bcImpl, Canvas canvas) {
89         this.bcImpl = bcImpl;
90         this.canvas = canvas;
91     }
92
93     private double getStartX() {
94         if (bcImpl.hasQuietZone()) {
95             return bcImpl.getQuietZone();
96         } else {
97             return 0.0;
98         }
99     }
100
101     /**
102      * @see org.krysalis.barcode.BarcodeLogicHandler#startBarcode(String)
103      */
104     public void startBarcode(String JavaDoc msg) {
105         this.msg = msg;
106         //Calculate extents
107 BarcodeDimension dim = bcImpl.calcDimensions(msg);
108         canvas.establishDimensions(dim);
109         x = getStartX();
110     }
111
112     /**
113      * @see org.krysalis.barcode.HeightVariableLogicHandler#addBar(boolean, int)
114      */
115     public void addBar(boolean black, int height) {
116         final double w = black ? bcImpl.getBarWidth(1) : bcImpl.getBarWidth(-1);
117         final double h = bcImpl.getBarHeight(height);
118         final BaselineAlignment baselinePosition = bcImpl.getBaselinePosition();
119         
120         if (black) {
121             if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
122                 if (baselinePosition == BaselineAlignment.ALIGN_TOP) {
123                     canvas.drawRectWH(x, bcImpl.getHumanReadableHeight(), w, h);
124                 } else if (baselinePosition == BaselineAlignment.ALIGN_BOTTOM) {
125                     canvas.drawRectWH(x, bcImpl.getHeight() - h, w, h);
126                 }
127             } else {
128                 if (baselinePosition == BaselineAlignment.ALIGN_TOP) {
129                     canvas.drawRectWH(x, 0, w, h);
130                 } else if (baselinePosition == BaselineAlignment.ALIGN_BOTTOM) {
131                     canvas.drawRectWH(x, bcImpl.getBarHeight() - h, w, h);
132                 }
133             }
134         }
135         x += w;
136     }
137
138     /**
139      * @see org.krysalis.barcode.BarcodeLogicHandler#endBarcode()
140      */
141     public void endBarcode() {
142         if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
143             //nop
144 } else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
145             bcImpl.drawCenteredText(canvas, msg, getStartX(), x, bcImpl.getHumanReadableHeight());
146         } else if (bcImpl.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
147             bcImpl.drawCenteredText(canvas, msg, getStartX(), x, bcImpl.getHeight());
148         }
149     }
150
151     /**
152      * @see org.krysalis.barcode.HeightVariableLogicHandler#startBarGroup(BarGroup, String)
153      */
154     public void startBarGroup(BarGroup barGroup, String JavaDoc string) {
155     }
156
157     /**
158      * @see org.krysalis.barcode.HeightVariableLogicHandler#endBarGroup()
159      */
160     public void endBarGroup() {
161     }
162
163 }
164
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