/* === S Y N F I G ========================================================= */
/*! \file state_zoom.cpp
** \brief Zoom Tool Implementation File
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2008 Chris Moore
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
** \endlegal
*/
/* ========================================================================= */
/* === H E A D E R S ======================================================= */
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "app.h"
#include <synfig/general.h>
#include <ETL/handle>
#include <synfig/vector.h>
#include "state_zoom.h"
#include "state_normal.h"
#include "event_mouse.h"
#include "canvasview.h"
#include "workarea.h"
#include "docks/dock_toolbox.h"
#include <synfigapp/main.h>
#include <gui/localization.h>
#endif
/* === U S I N G =========================================================== */
using namespace std;
using namespace etl;
using namespace synfig;
using namespace studio;
/* === M A C R O S ========================================================= */
/* === G L O B A L S ======================================================= */
StateZoom studio::state_zoom;
const float ZOOMFACTOR = 1.25f;
/* === C L A S S E S & S T R U C T S ======================================= */
class studio::StateZoom_Context : public sigc::trackable
{
etl::handle<CanvasView> canvas_view_;
CanvasView::IsWorking is_working;
WorkArea::PushState push_state;
Point p1,p2;
public:
//events
Smach::event_result event_stop_handler(const Smach::event& x);
Smach::event_result event_refresh_handler(const Smach::event& x);
Smach::event_result event_mouse_click_handler(const Smach::event& x);
//constructor destructor
StateZoom_Context(CanvasView* canvas_view);
~StateZoom_Context();
//Canvas interaction
const etl::handle<CanvasView>& get_canvas_view()const{return canvas_view_;}
etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const{return canvas_view_->canvas_interface();}
synfig::Canvas::Handle get_canvas()const{return canvas_view_->get_canvas();}
WorkArea * get_work_area()const{return canvas_view_->get_work_area();}
//void zoom(const Point& p1, const Point& p2);
}; // END of class StateZoom_Context
/* === M E T H O D S ======================================================= */
StateZoom::StateZoom():
Smach::state<StateZoom_Context>("zoom")
{
insert(event_def(EVENT_STOP,&StateZoom_Context::event_stop_handler));
insert(event_def(EVENT_REFRESH,&StateZoom_Context::event_refresh_handler));
insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,&StateZoom_Context::event_mouse_click_handler));
//insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,&StateZoom_Context::event_mouse_click_handler));
insert(event_def(EVENT_WORKAREA_BOX,&StateZoom_Context::event_mouse_click_handler));
//insert(event_def(EVENT_WORKAREA_BUTTON_CLICK,&StateZoom_Context::event_mouse_click_handler));
insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_UP,&StateZoom_Context::event_mouse_click_handler));
}
StateZoom::~StateZoom()
{
}
StateZoom_Context::StateZoom_Context(CanvasView* canvas_view):
canvas_view_(canvas_view),
is_working(*canvas_view),
push_state(*get_work_area())
{
// Turn off layer clicking
get_work_area()->set_allow_layer_clicks(false);
// Hide all ducks
get_work_area()->set_type_mask(Duck::TYPE_NONE);
get_canvas_view()->toggle_duck_mask(Duck::TYPE_NONE);
get_work_area()->set_cursor(Gdk::CROSSHAIR);
App::dock_toolbox->refresh();
}
StateZoom_Context::~StateZoom_Context()
{
// Refresh the work area
get_work_area()->queue_draw();
App::dock_toolbox->refresh();
}
Smach::event_result
StateZoom_Context::event_stop_handler(const Smach::event& /*x*/)
{
//throw Smach::egress_exception();
throw &state_normal;
return Smach::RESULT_OK;
}
Smach::event_result
StateZoom_Context::event_refresh_handler(const Smach::event& /*x*/)
{
return Smach::RESULT_ACCEPT;
}
Smach::event_result
StateZoom_Context::event_mouse_click_handler(const Smach::event& x)
{
if(x.key==EVENT_WORKAREA_BOX)
{
const EventBox& event(*reinterpret_cast<const EventBox*>(&x));
if(event.button==BUTTON_LEFT)
{
Point tl = get_work_area()->get_window_tl();
Point br = get_work_area()->get_window_br();
Vector window_span = br - tl, window_middle = (br+tl)/2;
Vector box_span = event.p2 - event.p1, box_middle = (event.p1+event.p2)/2;
Point newpos;
float zoom;
if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
{
if (window_span[0] == 0 || window_span[1] == 0) zoom = 1;
else zoom = max(abs(box_span[0]/window_span[0]), abs(box_span[1]/window_span[1]));
// focus_point is -1 times the real position for some reason...
// center the window so the old contents fill the drawn box
newpos = -((window_middle - box_middle)/zoom + window_middle);
}
else // zoom in
{
if (box_span[0] == 0 || box_span[1] == 0) zoom = 1;
else zoom = min(abs(window_span[0]/box_span[0]), abs(window_span[1]/box_span[1]));
// center the window at the center of the box
newpos = -(-get_work_area()->get_focus_point() + (box_middle - window_middle));
}
get_work_area()->set_focus_point(newpos);
get_work_area()->set_zoom(get_work_area()->get_zoom()*zoom);
return Smach::RESULT_ACCEPT;
}
}
if(x.key==EVENT_WORKAREA_MOUSE_BUTTON_UP)
{
const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
if(event.button==BUTTON_LEFT)
{
Point evpos;
//make the event pos be in the same space...
// The weird ass inverted center normalized space...
{
const Point realcenter = (get_work_area()->get_window_tl() + get_work_area()->get_window_br())/2;
evpos = -(event.pos - realcenter) + get_work_area()->get_focus_point();
}
/* Zooming:
focus point must zoom about the point evpos...
trans about an origin not 0:
p' = A(p - o) + o
*/
Vector v = get_work_area()->get_focus_point() - evpos;
if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
{
v*=ZOOMFACTOR;
//get_work_area()->zoom_out();
get_work_area()->set_focus_point(evpos + v);
get_work_area()->set_zoom(get_work_area()->get_zoom()/ZOOMFACTOR);
}else //zoom in
{
v/=ZOOMFACTOR;
//get_work_area()->zoom_in();
get_work_area()->set_focus_point(evpos + v);
get_work_area()->set_zoom(get_work_area()->get_zoom()*ZOOMFACTOR);
}
return Smach::RESULT_ACCEPT;
}
}
return Smach::RESULT_OK;
}