synfig-studio/src/gtkmm/state_zoom.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file state_zoom.cpp
   3 **      \brief Zoom Tool Implementation File
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **  Copyright (c) 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #include <sigc++/signal.h>
  34 #include <sigc++/object.h>
  35
  36 #include <ETL/handle>
  37 #include <synfig/vector.h>
  38
  39
  40 #include "state_zoom.h"
  41 #include "event_mouse.h"
  42 #include "canvasview.h"
  43 #include "workarea.h"
  44 #include "app.h"
  45 #include "toolbox.h"
  46 #include <synfigapp/main.h>
  47
  48 #include "general.h"
  49
  50 #endif
  51
  52 /* === U S I N G =========================================================== */
  53
  54 using namespace std;
  55 using namespace etl;
  56 using namespace synfig;
  57 using namespace studio;
  58
  59 /* === M A C R O S ========================================================= */
  60
  61 /* === G L O B A L S ======================================================= */
  62 StateZoom studio::state_zoom;
  63
  64 const float ZOOMFACTOR = 1.25f;
  65
  66 /* === C L A S S E S & S T R U C T S ======================================= */
  67
  68 class studio::StateZoom_Context : public sigc::trackable
  69 {
  70         etl::handle<CanvasView> canvas_view_;
  71         CanvasView::IsWorking is_working;
  72
  73         Point p1,p2;
  74
  75         bool prev_workarea_layer_status_;
  76
  77 public:
  78
  79         //events
  80         Smach::event_result event_stop_handler(const Smach::event& x);
  81         Smach::event_result event_refresh_handler(const Smach::event& x);
  82         Smach::event_result event_mouse_click_handler(const Smach::event& x);
  83
  84         //constructor destructor
  85         StateZoom_Context(CanvasView* canvas_view);
  86         ~StateZoom_Context();
  87
  88         //Canvas interaction
  89         const etl::handle<CanvasView>& get_canvas_view()const{return canvas_view_;}
  90         etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const{return canvas_view_->canvas_interface();}
  91         synfig::Canvas::Handle get_canvas()const{return canvas_view_->get_canvas();}
  92         WorkArea * get_work_area()const{return canvas_view_->get_work_area();}
  93
  94         //void zoom(const Point& p1, const Point& p2);
  95
  96 };      // END of class StateZoom_Context
  97
  98 /* === M E T H O D S ======================================================= */
  99
 100 StateZoom::StateZoom():
 101         Smach::state<StateZoom_Context>("zoom")
 102 {
 103         insert(event_def(EVENT_STOP,&StateZoom_Context::event_stop_handler));
 104         insert(event_def(EVENT_REFRESH,&StateZoom_Context::event_refresh_handler));
 105         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,&StateZoom_Context::event_mouse_click_handler));
 106         //insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,&StateZoom_Context::event_mouse_click_handler));
 107         insert(event_def(EVENT_WORKAREA_BOX,&StateZoom_Context::event_mouse_click_handler));
 108         //insert(event_def(EVENT_WORKAREA_BUTTON_CLICK,&StateZoom_Context::event_mouse_click_handler));
 109         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_UP,&StateZoom_Context::event_mouse_click_handler));
 110 }
 111
 112 StateZoom::~StateZoom()
 113 {
 114 }
 115
 116 StateZoom_Context::StateZoom_Context(CanvasView* canvas_view):
 117         canvas_view_(canvas_view),
 118         is_working(*canvas_view),
 119         prev_workarea_layer_status_(get_work_area()->get_allow_layer_clicks())
 120 {
 121         // Turn off layer clicking
 122         get_work_area()->set_allow_layer_clicks(false);
 123
 124         // clear out the ducks
 125         get_work_area()->clear_ducks(); //???
 126
 127         // Refresh the work area
 128         get_work_area()->queue_draw();
 129
 130         // Hide the tables if they are showing
 131         //prev_table_status=get_canvas_view()->tables_are_visible();
 132         //if(prev_table_status)get_canvas_view()->hide_tables();
 133
 134         // Disable the time bar
 135         //get_canvas_view()->set_sensitive_timebar(false);
 136
 137         // Connect a signal
 138         //get_work_area()->signal_user_click().connect(sigc::mem_fun(*this,&studio::StateZoom_Context::on_user_click));
 139         get_canvas_view()->work_area->set_cursor(Gdk::CROSSHAIR);
 140
 141         App::toolbox->refresh();
 142 }
 143
 144 StateZoom_Context::~StateZoom_Context()
 145 {
 146         // Restore layer clicking
 147         get_work_area()->set_allow_layer_clicks(prev_workarea_layer_status_);
 148         get_canvas_view()->work_area->reset_cursor();
 149
 150         // Enable the time bar
 151         //get_canvas_view()->set_sensitive_timebar(true);
 152
 153         // Bring back the tables if they were out before
 154         //if(prev_table_status)get_canvas_view()->show_tables();
 155
 156         // Refresh the work area
 157         get_work_area()->queue_draw();
 158
 159         App::toolbox->refresh();
 160
 161         get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
 162 }
 163
 164 Smach::event_result
 165 StateZoom_Context::event_stop_handler(const Smach::event& /*x*/)
 166 {
 167         //throw Smach::egress_exception();
 168         throw &state_normal;
 169         return Smach::RESULT_OK;
 170 }
 171
 172 Smach::event_result
 173 StateZoom_Context::event_refresh_handler(const Smach::event& /*x*/)
 174 {
 175         return Smach::RESULT_ACCEPT;
 176 }
 177
 178 Smach::event_result
 179 StateZoom_Context::event_mouse_click_handler(const Smach::event& x)
 180 {
 181         if(x.key==EVENT_WORKAREA_BOX)
 182         {
 183                 const EventBox& event(*reinterpret_cast<const EventBox*>(&x));
 184
 185                 if(event.button==BUTTON_LEFT)
 186                 {
 187                         Point tl = get_work_area()->get_window_tl();
 188                         Point br = get_work_area()->get_window_br();
 189                         Vector  window_span = br - tl, window_middle = (br+tl)/2;
 190                         Vector  box_span = event.p2 - event.p1, box_middle = (event.p1+event.p2)/2;
 191                         Point newpos;
 192                         float zoom;
 193
 194                         if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
 195                         {
 196                                 if (window_span[0] == 0 || window_span[1] == 0) zoom = 1;
 197                                 else zoom = max(abs(box_span[0]/window_span[0]), abs(box_span[1]/window_span[1]));
 198
 199                                 // focus_point is -1 times the real position for some reason...
 200                                 // center the window so the old contents fill the drawn box
 201                                 newpos = -((window_middle - box_middle)/zoom + window_middle);
 202                         }
 203                         else                            // zoom in
 204                         {
 205                                 if (box_span[0] == 0 || box_span[1] == 0) zoom = 1;
 206                                 else zoom = min(abs(window_span[0]/box_span[0]), abs(window_span[1]/box_span[1]));
 207
 208                                 // center the window at the center of the box
 209                                 newpos = -(-get_work_area()->get_focus_point() + (box_middle - window_middle));
 210                         }
 211
 212                         get_work_area()->set_focus_point(newpos);
 213                         get_work_area()->set_zoom(get_work_area()->get_zoom()*zoom);
 214
 215                         return Smach::RESULT_ACCEPT;
 216                 }
 217         }
 218
 219         if(x.key==EVENT_WORKAREA_MOUSE_BUTTON_UP)
 220         {
 221                 const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
 222
 223                 if(event.button==BUTTON_LEFT)
 224                 {
 225                         Point evpos;
 226
 227                         //make the event pos be in the same space...
 228                         //   The weird ass inverted center normalized space...
 229                         {
 230                                 const Point realcenter = (get_work_area()->get_window_tl() + get_work_area()->get_window_br())/2;
 231                                 evpos = -(event.pos - realcenter) + get_work_area()->get_focus_point();
 232                         }
 233
 234                         /*      Zooming:
 235                                 focus point must zoom about the point evpos...
 236
 237                                 trans about an origin not 0:
 238                                 p' = A(p - o) + o
 239                         */
 240
 241                         Vector v = get_work_area()->get_focus_point() - evpos;
 242
 243                         if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
 244                         {
 245                                 v*=ZOOMFACTOR;
 246                                 //get_work_area()->zoom_out();
 247                                 get_work_area()->set_focus_point(evpos + v);
 248                                 get_work_area()->set_zoom(get_work_area()->get_zoom()/ZOOMFACTOR);
 249                         }else //zoom in
 250                         {
 251                                 v/=ZOOMFACTOR;
 252                                 //get_work_area()->zoom_in();
 253                                 get_work_area()->set_focus_point(evpos + v);
 254                                 get_work_area()->set_zoom(get_work_area()->get_zoom()*ZOOMFACTOR);
 255                         }
 256
 257                         return Smach::RESULT_ACCEPT;
 258                 }
 259         }
 260
 261         return Smach::RESULT_OK;
 262 }