--- /dev/null
+/* === S I N F G =========================================================== */
+/*! \file zoom.cpp
+** \brief writeme
+**
+** $Id: zoom.cpp,v 1.2 2005/01/24 03:08:17 darco Exp $
+**
+** \legal
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This software and associated documentation
+** are CONFIDENTIAL and PROPRIETARY property of
+** the above-mentioned copyright holder.
+**
+** You may not copy, print, publish, or in any
+** other way distribute this software without
+** a prior written agreement with
+** the copyright holder.
+** \endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "zoom.h"
+#include <sinfg/string.h>
+#include <sinfg/time.h>
+#include <sinfg/context.h>
+#include <sinfg/paramdesc.h>
+#include <sinfg/renddesc.h>
+#include <sinfg/surface.h>
+#include <sinfg/value.h>
+#include <sinfg/valuenode.h>
+#include <sinfg/transform.h>
+
+#endif
+
+/* === M A C R O S ========================================================= */
+
+/* === G L O B A L S ======================================================= */
+
+SINFG_LAYER_INIT(Zoom);
+SINFG_LAYER_SET_NAME(Zoom,"zoom");
+SINFG_LAYER_SET_LOCAL_NAME(Zoom,_("Zoom"));
+SINFG_LAYER_SET_CATEGORY(Zoom,_("Transform"));
+SINFG_LAYER_SET_VERSION(Zoom,"0.1");
+SINFG_LAYER_SET_CVS_ID(Zoom,"$Id: zoom.cpp,v 1.2 2005/01/24 03:08:17 darco Exp $");
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+/* === E N T R Y P O I N T ================================================= */
+
+Zoom::Zoom():
+ center(0,0),
+ amount(0)
+{
+}
+
+bool
+Zoom::set_param(const String & param, const ValueBase &value)
+{
+
+ IMPORT(center);
+ IMPORT(amount);
+
+ return false;
+}
+
+ValueBase
+Zoom::get_param(const String ¶m)const
+{
+ EXPORT(center);
+ EXPORT(amount);
+
+ EXPORT_NAME();
+ EXPORT_VERSION();
+
+ return ValueBase();
+}
+
+Layer::Vocab
+Zoom::get_param_vocab()const
+{
+ Layer::Vocab ret;
+
+ ret.push_back(ParamDesc("amount")
+ .set_local_name(_("Amount"))
+ .set_description(_("Amount to zoom in"))
+ );
+
+ ret.push_back(ParamDesc("center")
+ .set_local_name(_("Center"))
+ .set_description(_("Point to zoom in to"))
+ );
+
+ return ret;
+}
+
+sinfg::Layer::Handle
+Zoom::hit_check(sinfg::Context context, const sinfg::Point &pos)const
+{
+ return context.hit_check((pos-center)/exp(amount)+center);
+}
+
+Color
+Zoom::get_color(Context context, const Point &pos)const
+{
+ return context.get_color((pos-center)/exp(amount)+center);
+}
+
+class Zoom_Trans : public Transform
+{
+ etl::handle<const Zoom> layer;
+public:
+ Zoom_Trans(const Zoom* x):Transform(x->get_guid()),layer(x) { }
+
+ sinfg::Vector perform(const sinfg::Vector& x)const
+ {
+ return (x-layer->center)*exp(layer->amount)+layer->center;
+ }
+
+ sinfg::Vector unperform(const sinfg::Vector& x)const
+ {
+ return (x-layer->center)/exp(layer->amount)+layer->center;
+ }
+};
+etl::handle<Transform>
+Zoom::get_transform()const
+{
+ return new Zoom_Trans(this);
+}
+
+bool
+Zoom::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
+{
+ Vector::value_type zoomfactor=1.0/exp(amount);
+ RendDesc desc(renddesc);
+ desc.clear_flags();
+
+ // Adjust the top_left and bottom_right points
+ // for our zoom amount
+ desc.set_tl((desc.get_tl()-center)*zoomfactor+center);
+ desc.set_br((desc.get_br()-center)*zoomfactor+center);
+
+ // Render the scene
+ return context.accelerated_render(surface,quality,desc,cb);
+}
+
+sinfg::Rect
+Zoom::get_full_bounding_rect(sinfg::Context context)const
+{
+ return context.get_full_bounding_rect();
+}
+