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49 package com.lowagie.text.pdf;
50
51 import java.awt.Canvas  ;
52 import java.awt.Color ;
53 import java.awt.Image ;
54 import java.awt.image.MemoryImageSource ;
55
56 import com.lowagie.text.Element;
57 import com.lowagie.text.ExceptionConverter;
58 import com.lowagie.text.Rectangle;
59
60
76 public class BarcodeCodabar extends Barcode{
77
78
80 private static final byte BARS[][] =
81 {
82 {0,0,0,0,0,1,1}, {0,0,0,0,1,1,0}, {0,0,0,1,0,0,1}, {1,1,0,0,0,0,0}, {0,0,1,0,0,1,0}, {1,0,0,0,0,1,0}, {0,1,0,0,0,0,1}, {0,1,0,0,1,0,0}, {0,1,1,0,0,0,0}, {1,0,0,1,0,0,0}, {0,0,0,1,1,0,0}, {0,0,1,1,0,0,0}, {1,0,0,0,1,0,1}, {1,0,1,0,0,0,1}, {1,0,1,0,1,0,0}, {0,0,1,0,1,0,1}, {0,0,1,1,0,1,0}, {0,1,0,1,0,0,1}, {0,0,0,1,0,1,1}, {0,0,0,1,1,1,0} };
103
104
106 private static final String CHARS = "0123456789-$:/.+ABCD";
107
108 private static final int START_STOP_IDX = 16;
109
111 public BarcodeCodabar() {
112 try {
113 x = 0.8f;
114 n = 2;
115 font = BaseFont.createFont("Helvetica", "winansi", false);
116 size = 8;
117 baseline = size;
118 barHeight = size * 3;
119 textAlignment = Element.ALIGN_CENTER;
120 generateChecksum = false;
121 checksumText = false;
122 startStopText = false;
123 codeType = CODABAR;
124 }
125 catch (Exception e) {
126 throw new ExceptionConverter(e);
127 }
128 }
129
130
134 public static byte[] getBarsCodabar(String text) {
135 text = text.toUpperCase();
136 int len = text.length();
137 if (len < 2)
138 throw new IllegalArgumentException ("Codabar must have at least a start and stop character.");
139 if (CHARS.indexOf(text.charAt(0)) < START_STOP_IDX || CHARS.indexOf(text.charAt(len - 1)) < START_STOP_IDX)
140 throw new IllegalArgumentException ("Codabar must have one of 'ABCD' as start/stop character.");
141 byte bars[] = new byte[text.length() * 8 - 1];
142 for (int k = 0; k < len; ++k) {
143 int idx = CHARS.indexOf(text.charAt(k));
144 if (idx >= START_STOP_IDX && k > 0 && k < len - 1)
145 throw new IllegalArgumentException ("In codabar, start/stop characters are only allowed at the extremes.");
146 if (idx < 0)
147 throw new IllegalArgumentException ("The character '" + text.charAt(k) + "' is illegal in codabar.");
148 System.arraycopy(BARS[idx], 0, bars, k * 8, 7);
149 }
150 return bars;
151 }
152
153 public static String calculateChecksum(String code) {
154 if (code.length() < 2)
155 return code;
156 String text = code.toUpperCase();
157 int sum = 0;
158 int len = text.length();
159 for (int k = 0; k < len; ++k)
160 sum += CHARS.indexOf(text.charAt(k));
161 sum = (sum + 15) / 16 * 16 - sum;
162 return code.substring(0, len - 1) + CHARS.charAt(sum) + code.substring(len - 1);
163 }
164
165
169 public Rectangle getBarcodeSize() {
170 float fontX = 0;
171 float fontY = 0;
172 String text = code;
173 if (generateChecksum && checksumText)
174 text = calculateChecksum(code);
175 if (!startStopText)
176 text = text.substring(1, text.length() - 1);
177 if (font != null) {
178 if (baseline > 0)
179 fontY = baseline - font.getFontDescriptor(BaseFont.DESCENT, size);
180 else
181 fontY = -baseline + size;
182 fontX = font.getWidthPoint(altText != null ? altText : text, size);
183 }
184 text = code;
185 if (generateChecksum)
186 text = calculateChecksum(code);
187 byte bars[] = getBarsCodabar(text);
188 int wide = 0;
189 for (int k = 0; k < bars.length; ++k) {
190 wide += (int)bars[k];
191 }
192 int narrow = bars.length - wide;
193 float fullWidth = x * (narrow + wide * n);
194 fullWidth = Math.max(fullWidth, fontX);
195 float fullHeight = barHeight + fontY;
196 return new Rectangle(fullWidth, fullHeight);
197 }
198
199
235 public Rectangle placeBarcode(PdfContentByte cb, Color barColor, Color textColor) {
236 String fullCode = code;
237 if (generateChecksum && checksumText)
238 fullCode = calculateChecksum(code);
239 if (!startStopText)
240 fullCode = fullCode.substring(1, fullCode.length() - 1);
241 float fontX = 0;
242 if (font != null) {
243 fontX = font.getWidthPoint(fullCode = altText != null ? altText : fullCode, size);
244 }
245 byte bars[] = getBarsCodabar(generateChecksum ? calculateChecksum(code) : code);
246 int wide = 0;
247 for (int k = 0; k < bars.length; ++k) {
248 wide += (int)bars[k];
249 }
250 int narrow = bars.length - wide;
251 float fullWidth = x * (narrow + wide * n);
252 float barStartX = 0;
253 float textStartX = 0;
254 switch (textAlignment) {
255 case Element.ALIGN_LEFT:
256 break;
257 case Element.ALIGN_RIGHT:
258 if (fontX > fullWidth)
259 barStartX = fontX - fullWidth;
260 else
261 textStartX = fullWidth - fontX;
262 break;
263 default:
264 if (fontX > fullWidth)
265 barStartX = (fontX - fullWidth) / 2;
266 else
267 textStartX = (fullWidth - fontX) / 2;
268 break;
269 }
270 float barStartY = 0;
271 float textStartY = 0;
272 if (font != null) {
273 if (baseline <= 0)
274 textStartY = barHeight - baseline;
275 else {
276 textStartY = -font.getFontDescriptor(BaseFont.DESCENT, size);
277 barStartY = textStartY + baseline;
278 }
279 }
280 boolean print = true;
281 if (barColor != null)
282 cb.setColorFill(barColor);
283 for (int k = 0; k < bars.length; ++k) {
284 float w = (bars[k] == 0 ? x : x * n);
285 if (print)
286 cb.rectangle(barStartX, barStartY, w - inkSpreading, barHeight);
287 print = !print;
288 barStartX += w;
289 }
290 cb.fill();
291 if (font != null) {
292 if (textColor != null)
293 cb.setColorFill(textColor);
294 cb.beginText();
295 cb.setFontAndSize(font, size);
296 cb.setTextMatrix(textStartX, textStartY);
297 cb.showText(fullCode);
298 cb.endText();
299 }
300 return getBarcodeSize();
301 }
302
303
309 public java.awt.Image createAwtImage(Color foreground, Color background) {
310 int f = foreground.getRGB();
311 int g = background.getRGB();
312 Canvas canvas = new Canvas ();
313
314 String fullCode = code;
315 if (generateChecksum && checksumText)
316 fullCode = calculateChecksum(code);
317 if (!startStopText)
318 fullCode = fullCode.substring(1, fullCode.length() - 1);
319 byte bars[] = getBarsCodabar(generateChecksum ? calculateChecksum(code) : code);
320 int wide = 0;
321 for (int k = 0; k < bars.length; ++k) {
322 wide += (int)bars[k];
323 }
324 int narrow = bars.length - wide;
325 int fullWidth = narrow + wide * (int)n;
326 boolean print = true;
327 int ptr = 0;
328 int height = (int)barHeight;
329 int pix[] = new int[fullWidth * height];
330 for (int k = 0; k < bars.length; ++k) {
331 int w = (bars[k] == 0 ? 1 : (int)n);
332 int c = g;
333 if (print)
334 c = f;
335 print = !print;
336 for (int j = 0; j < w; ++j)
337 pix[ptr++] = c;
338 }
339 for (int k = fullWidth; k < pix.length; k += fullWidth) {
340 System.arraycopy(pix, 0, pix, k, fullWidth);
341 }
342 Image img = canvas.createImage(new MemoryImageSource (fullWidth, height, pix, 0, fullWidth));
343
344 return img;
345 }
346 }
347 |
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