moving trunk for module inkscape

(bzr r1)

1 files changed, 108 insertions, 0 deletions

diff --git a/src/sp-offset.h b/src/sp-offset.h
new file mode 100644
index 000000000..52c793d0e
--- /dev/null
+++ b/src/sp-offset.h
@@ -0,0 +1,108 @@
+#ifndef __SP_OFFSET_H__
+#define __SP_OFFSET_H__
+
+/** \file
+ * SPOffset class.
+ *
+ * Authors:  
+ *   Mitsuru Oka <oka326@parkcity.ne.jp>
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ * (of the sp-spiral.h upon which this file was created)
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "sp-shape.h"
+
+#include <sigc++/sigc++.h>
+
+#define SP_TYPE_OFFSET            (sp_offset_get_type ())
+#define SP_OFFSET(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), SP_TYPE_OFFSET, SPOffset))
+#define SP_OFFSET_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), SP_TYPE_OFFSET, SPOffsetClass))
+#define SP_IS_OFFSET(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SP_TYPE_OFFSET))
+#define SP_IS_OFFSET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), SP_TYPE_OFFSET))
+
+class SPOffset;
+class SPOffsetClass;
+class SPUseReference;
+
+/**
+ * SPOffset class.
+ *
+ * An offset is defined by curve and radius. The original curve is kept as 
+ * a path in a sodipodi:original attribute. It's not possible to change 
+ * the original curve.
+ *
+ * SPOffset is a derivative of SPShape, much like the SPSpiral or SPRect.
+ * The goal is to have a source shape (= originalPath), an offset (= radius) 
+ * and compute the offset of the source by the radius. To get it to work, 
+ * one needs to know what the source is and what the radius is, and how it's 
+ * stored in the xml representation. The object itself is a "path" element, 
+ * to get lots of shape functionality for free. The source is the easy part: 
+ * it's stored in a "inkscape:original" attribute in the path. In case of 
+ * "linked" offset, as they've been dubbed, there is an additional
+ * "inkscape:href" that contains the id of an element of the svg. 
+ * When built, the object will attach a listener vector to that object and 
+ * rebuild the "inkscape:original" whenever the href'd object changes. This 
+ * is of course grossly inefficient, and also does not react to changes 
+ * to the href'd during context stuff (like changing the shape of a star by 
+ * dragging control points) unless the path of that object is changed during 
+ * the context (seems to be the case for SPEllipse). The computation of the 
+ * offset is done in sp_offset_set_shape(), a function that is called whenever 
+ * a change occurs to the offset (change of source or change of radius).
+ * just like the sp-star and other, this path derivative can make control 
+ * points, or more precisely one control point, that's enough to define the 
+ * radius (look in object-edit).
+ */
+struct SPOffset : public SPShape {
+  void *originalPath; ///< will be a livarot Path, just don't declare it here to please the gcc linker
+  char *original;     ///< SVG description of the source path
+  float rad;          ///< offset radius
+
+  /// for interactive setting of the radius
+  bool knotSet;
+  NR::Point knot;
+	
+	bool           sourceDirty;
+	bool           isUpdating;
+
+	gchar					 *sourceHref;
+	SPUseReference *sourceRef;
+  Inkscape::XML::Node         *sourceRepr; ///< the repr associated with that id
+	SPObject			 *sourceObject;
+	
+	gulong           _modified_connection;
+	sigc::connection _delete_connection;
+	sigc::connection _changed_connection;
+	sigc::connection _transformed_connection;
+};
+
+/// The SPOffset vtable.
+struct SPOffsetClass
+{
+  SPShapeClass parent_class;
+};
+
+
+/* Standard Gtk function */
+GType sp_offset_get_type (void);
+
+double sp_offset_distance_to_original (SPOffset * offset, NR::Point px);
+void sp_offset_top_point (SPOffset * offset, NR::Point *px);
+
+SPItem *sp_offset_get_source (SPOffset *offset);
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :