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+<div class="refentry">
+<a name="libglbarcode-intro"></a><div class="titlepage"></div>
+<div class="refnamediv"><table width="100%"><tr>
+<td valign="top">
+<h2><span class="refentrytitle"><a name="libglbarcode-intro.top_of_page"></a>Introduction</span></h2>
+<p>Introduction —
+Introduction to libglbarcode library
+</p>
+</td>
+<td valign="top" align="right"></td>
+</tr></table></div>
+<div class="refsect1">
+<a name="id2963460"></a><h2>Overview</h2>
+<p>
+Libglbarcode provides the core barcode functionality for <span class="application">glabels</span>. It provides
+an intermediate barcode format, a small set of built-in barcode back-ends, and a cairo renderer. While
+libglbarcode does not currently include a large set of built-in barcode back-ends or renderers, its
+simple architecture would easily support extending its functionality beyond the needs of
+<span class="application">glabels</span>.
+</p>
+</div>
+<div class="refsect1">
+<a name="id2963536"></a><h2>Basic Usage</h2>
+<pre class="programlisting">
+
+#include <libglbarcode/lgl-barcode-create.h>
+#include <libglbarcode/lgl-barcode-render-to-cairo.h>
+
+void
+example (gchar *data,
+ cairo_t *cr)
+{
+ glBarcode *bc;
+
+ bc = lgl_barcode_create (LGL_BARCODE_TYPE_CODE39, TRUE, FALSE, 0, 0, data);
+
+ /* Render to cairo context. Assume context has appropriate scale and translation.
+ * Scale should be such that world units are points (1 point = 1/72 inch) and that
+ * positive y values go downward.
+ */
+ lgl_barcode_render_to_cairo (bc, cr);
+
+ lgl_free (bc);
+}
+
+</pre>
+</div>
+<div class="refsect1">
+<a name="id2963569"></a><h2>Writing Renderers</h2>
+<p>
+The <a class="link" href="libglbarcode-3.0-lgl-barcode.html#lglBarcode" title="lglBarcode">lglBarcode</a> structure is independent of
+barcode type, and consists of a simple list of drawing primitives.
+A renderer simply traverses this list translating these primitives into native
+drawing commands for its target format or device.
+All renderers will follow this simple pattern as illustrated in the example
+below.
+</p>
+<pre class="programlisting">
+
+#include <libglbarcode/lgl-barcode.h>
+#include <xxx.h>
+
+void
+lgl_barcode_render_to_xxx (const lglBarcode *bc)
+{
+ GList *p;
+
+ lglBarcodeShape *shape;
+ lglBarcodeShapeLine *line;
+ lglBarcodeShapeBox *box;
+ lglBarcodeShapeChar *bchar;
+ lglBarcodeShapeString *bstring;
+ lglBarcodeShapeRing *ring;
+ lglBarcodeShapeHexagon *hexagon;
+
+
+ for (p = bc->shapes; p != NULL; p = p->next) {
+
+ shape = (lglBarcodeShape *)p->data;
+
+ switch (shape->type)
+ {
+
+ case LGL_BARCODE_SHAPE_LINE:
+ line = (lglBarcodeShapeLine *) shape;
+
+ xxx_plot_line (line->x, line->y,
+ line->x, line->y + line->length,
+ line->width );
+ break;
+
+ case LGL_BARCODE_SHAPE_BOX:
+ box = (lglBarcodeShapeBox *) shape;
+
+ xxx_plot_rectangle (box->x, box->y,
+ box->width, box->height);
+ break;
+
+ case LGL_BARCODE_SHAPE_CHAR:
+ bchar = (lglBarcodeShapeChar *) shape;
+
+ ...
+ xxx_plot_char (...);
+ break;
+
+ case LGL_BARCODE_SHAPE_STRING:
+ bstring = (lglBarcodeShapeString *) shape;
+
+ ...
+ xxx_plot_string (...);
+ break;
+
+ case LGL_BARCODE_SHAPE_RING:
+ ring = (lglBarcodeShapeRing *) shape;
+
+ ...
+ xxx_plot_circle (...);
+ break;
+
+ case LGL_BARCODE_SHAPE_HEXAGON:
+ hexagon = (lglBarcodeShapeHexagon *) shape;
+
+ ...
+ xxx_plot_polygon (...);
+ break;
+
+ default:
+ g_assert_not_reached ();
+ break;
+
+ }
+
+ }
+
+}
+
+
+</pre>
+</div>
+</div>
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