source: synfigstudio/trunk/fuentes/.pc/c++11.patch/src/gui/states/state_zoom.cpp @ 481

/* === 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 <sigc++/signal.h>
#include <sigc++/object.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 "app.h"
#include "docks/dock_toolbox.h"
#include <synfigapp/main.h>

#include "general.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;
}