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+/* Copyright 2014, Sebastian Reichel <sre@ring0.de>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+public class Code39 {
+ Cairo.Context ctx;
+ double width;
+ double height;
+
+ /* 0 = wide black, 1 = narrow black, 2 = wide white, 3 = narrow white */
+ const uint32[] lookup_table = {
+ 0x1d8cd, 0xd9dc, 0x1c9dc, 0xc9dd, 0x1d8dc, 0xd8dd, 0x1c8dd, 0x1d9cc,
+ 0xd9cd, 0x1c9cd, 0xdd9c, 0x1cd9c, 0xcd9d, 0x1dc9c, 0xdc9d, 0x1cc9d,
+ 0x1dd8c, 0xdd8d, 0x1cd8d, 0x1dc8d, 0xddd8, 0x1cdd8, 0xcdd9, 0x1dcd8,
+ 0xdcd9, 0x1ccd9, 0x1ddc8, 0xddc9, 0x1cdc9, 0x1dcc9, 0x9ddc, 0x18ddc,
+ 0x8ddd, 0x19cdc, 0x9cdd, 0x18cdd, 0x19dcc, 0x9dcd, 0x18dcd, 0x1999d,
+ 0x199d9, 0x19d99, 0x1d999, 0x19ccd
+ };
+
+ public Code39(Cairo.Context ctx, double width, double height) {
+ this.ctx = ctx;
+ this.width = width;
+ this.height = height;
+ }
+
+ private int lookup_index(char c) throws BarcodeError {
+ if(c >= '0' && c <= '9')
+ return c - '0';
+ if(c >= 'A' && c <= 'Z')
+ return c - 'A' + 10;
+ switch (c) {
+ case '-':
+ return 36;
+ case '.':
+ return 37;
+ case ' ':
+ return 38;
+ case '$':
+ return 39;
+ case '/':
+ return 40;
+ case '+':
+ return 41;
+ case '%':
+ return 42;
+ case '*':
+ return 43;
+ default:
+ throw new BarcodeError.UNEXPECTED_CHARACTER("Character '%c' is not allowed in Code 39".printf(c));
+ }
+ }
+
+ private uint32 lookup(char c) throws BarcodeError {
+ return lookup_table[lookup_index(c)];
+ }
+
+ private void draw_line(bool black, double linewidth) {
+ double x,y;
+
+ if(black)
+ ctx.set_source_rgb(0, 0, 0);
+ else
+ ctx.set_source_rgb(1, 1, 1);
+
+ ctx.rel_line_to(0,height);
+ ctx.rel_move_to(linewidth,-height);
+
+ ctx.get_current_point(out x, out y);
+ ctx.stroke();
+ ctx.move_to(x,y);
+ }
+
+ public void draw(string code) throws BarcodeError {
+ string mycode = code;
+
+ if(!mycode.has_prefix("*"))
+ mycode = "*" + mycode;
+ if(!mycode.has_suffix("*"))
+ mycode = mycode + "*";
+
+ double linewidth = width / (mycode.length * 13.0);
+
+ ctx.save();
+ ctx.set_line_width(linewidth);
+ ctx.move_to(0,0);
+ ctx.rel_move_to(0.5*linewidth,0);
+
+ for(int i=0; i<mycode.length; i++) {
+ var format = lookup(mycode[i]);
+
+ for(int j=8; j>=0; j--) {
+ var line = (format >> (2*j)) & 0x3;
+
+ switch(line) {
+ case 0:
+ draw_line(true, linewidth);
+ draw_line(true, linewidth);
+ break;
+ case 1:
+ draw_line(true, linewidth);
+ break;
+ case 2:
+ draw_line(false, linewidth);
+ draw_line(false, linewidth);
+ break;
+ default:
+ draw_line(false, linewidth);
+ break;
+ }
+ }
+
+ draw_line(false, linewidth);
+ }
+
+ ctx.restore();
+ }
+}