synfig-studio/trunk/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 **
  10 **      This package is free software; you can redistribute it and/or
  11 **      modify it under the terms of the GNU General Public License as
  12 **      published by the Free Software Foundation; either version 2 of
  13 **      the License, or (at your option) any later version.
  14 **
  15 **      This package is distributed in the hope that it will be useful,
  16 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18 **      General Public License for more details.
  19 **      \endlegal
  20 */
  21 /* ========================================================================= */
  22
  23 /* === H E A D E R S ======================================================= */
  24
  25 #ifdef USING_PCH
  26 #       include "pch.h"
  27 #else
  28 #ifdef HAVE_CONFIG_H
  29 #       include <config.h>
  30 #endif
  31
  32 #include <sigc++/signal.h>
  33 #include <sigc++/object.h>
  34
  35 #include <ETL/handle>
  36 #include <synfig/vector.h>
  37
  38
  39 #include "state_zoom.h"
  40 #include "event_mouse.h"
  41 #include "canvasview.h"
  42 #include "workarea.h"
  43 #include "app.h"
  44 #include "toolbox.h"
  45 #include <synfigapp/main.h>
  46
  47 #include "general.h"
  48
  49 #endif
  50
  51 /* === U S I N G =========================================================== */
  52
  53 using namespace std;
  54 using namespace etl;
  55 using namespace synfig;
  56 using namespace studio;
  57
  58 /* === M A C R O S ========================================================= */
  59
  60 /* === G L O B A L S ======================================================= */
  61 StateZoom studio::state_zoom;
  62
  63 const float ZOOMFACTOR = 1.25f;
  64
  65 /* === C L A S S E S & S T R U C T S ======================================= */
  66
  67 class studio::StateZoom_Context : public sigc::trackable
  68 {
  69         etl::handle<CanvasView> canvas_view_;
  70         CanvasView::IsWorking is_working;
  71
  72         Point p1,p2;
  73
  74         bool prev_workarea_layer_status_;
  75
  76 public:
  77
  78         //events
  79         Smach::event_result event_stop_handler(const Smach::event& x);
  80         Smach::event_result event_refresh_handler(const Smach::event& x);
  81         Smach::event_result event_mouse_click_handler(const Smach::event& x);
  82
  83         //constructor destructor
  84         StateZoom_Context(CanvasView* canvas_view);
  85         ~StateZoom_Context();
  86
  87         //Canvas interaction
  88         const etl::handle<CanvasView>& get_canvas_view()const{return canvas_view_;}
  89         etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const{return canvas_view_->canvas_interface();}
  90         synfig::Canvas::Handle get_canvas()const{return canvas_view_->get_canvas();}
  91         WorkArea * get_work_area()const{return canvas_view_->get_work_area();}
  92
  93         //void zoom(const Point& p1, const Point& p2);
  94
  95 };      // END of class StateZoom_Context
  96
  97 /* === M E T H O D S ======================================================= */
  98
  99 StateZoom::StateZoom():
 100         Smach::state<StateZoom_Context>("zoom")
 101 {
 102         insert(event_def(EVENT_STOP,&StateZoom_Context::event_stop_handler));
 103         insert(event_def(EVENT_REFRESH,&StateZoom_Context::event_refresh_handler));
 104         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,&StateZoom_Context::event_mouse_click_handler));
 105         //insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,&StateZoom_Context::event_mouse_click_handler));
 106         insert(event_def(EVENT_WORKAREA_BOX,&StateZoom_Context::event_mouse_click_handler));
 107         //insert(event_def(EVENT_WORKAREA_BUTTON_CLICK,&StateZoom_Context::event_mouse_click_handler));
 108         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_UP,&StateZoom_Context::event_mouse_click_handler));
 109 }
 110
 111 StateZoom::~StateZoom()
 112 {
 113 }
 114
 115 StateZoom_Context::StateZoom_Context(CanvasView* canvas_view):
 116         canvas_view_(canvas_view),
 117         is_working(*canvas_view),
 118         prev_workarea_layer_status_(get_work_area()->get_allow_layer_clicks())
 119 {
 120         // Turn off layer clicking
 121         get_work_area()->set_allow_layer_clicks(false);
 122
 123         // clear out the ducks
 124         get_work_area()->clear_ducks(); //???
 125
 126         // Refresh the work area
 127         get_work_area()->queue_draw();
 128
 129         // Hide the tables if they are showing
 130         //prev_table_status=get_canvas_view()->tables_are_visible();
 131         //if(prev_table_status)get_canvas_view()->hide_tables();
 132
 133         // Disable the time bar
 134         //get_canvas_view()->set_sensitive_timebar(false);
 135
 136         // Connect a signal
 137         //get_work_area()->signal_user_click().connect(sigc::mem_fun(*this,&studio::StateZoom_Context::on_user_click));
 138         get_canvas_view()->work_area->set_cursor(Gdk::CROSSHAIR);
 139
 140         App::toolbox->refresh();
 141 }
 142
 143 StateZoom_Context::~StateZoom_Context()
 144 {
 145         // Restore layer clicking
 146         get_work_area()->set_allow_layer_clicks(prev_workarea_layer_status_);
 147         get_canvas_view()->work_area->reset_cursor();
 148
 149         // Enable the time bar
 150         //get_canvas_view()->set_sensitive_timebar(true);
 151
 152         // Bring back the tables if they were out before
 153         //if(prev_table_status)get_canvas_view()->show_tables();
 154
 155         // Refresh the work area
 156         get_work_area()->queue_draw();
 157
 158         App::toolbox->refresh();
 159
 160         get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
 161 }
 162
 163 Smach::event_result
 164 StateZoom_Context::event_stop_handler(const Smach::event& /*x*/)
 165 {
 166         throw Smach::egress_exception();
 167 }
 168
 169 Smach::event_result
 170 StateZoom_Context::event_refresh_handler(const Smach::event& /*x*/)
 171 {
 172         return Smach::RESULT_ACCEPT;
 173 }
 174
 175 Smach::event_result
 176 StateZoom_Context::event_mouse_click_handler(const Smach::event& x)
 177 {
 178         if(x.key==EVENT_WORKAREA_BOX)
 179         {
 180                 const EventBox& event(*reinterpret_cast<const EventBox*>(&x));
 181
 182                 if(event.button==BUTTON_LEFT)
 183                 {
 184                         //respond to event box...
 185
 186
 187                         //Center the new position at the center of the box
 188
 189                         //OH MY GOD HACK - the space is -1* and offset (by the value of the center of the canvas)...
 190                         Point newpos;
 191                         {
 192                                 const Point evcenter = (event.p1+event.p2)/2;
 193                                 const Point realcenter = (get_work_area()->get_window_tl() + get_work_area()->get_window_br())/2;
 194                                 newpos = -(evcenter - realcenter) + get_work_area()->get_focus_point();
 195                         }
 196
 197                         //The zoom will be whatever the required factor to convert current box size to desired box size
 198                         Point tl = get_work_area()->get_window_tl();
 199                         Point br = get_work_area()->get_window_br();
 200
 201                         Vector  span = br - tl;
 202                         Vector  v = event.p2 - event.p1;
 203
 204                         //get the minimum zoom as long as it's greater than 1...
 205                         v[0] = abs(v[0])/abs(span[0]);
 206                         v[1] = abs(v[1])/abs(span[1]);
 207
 208                         float zdiv = max(v[0],v[1]);
 209                         if(zdiv < 1 && zdiv > 0) //must be zoomable
 210                         {
 211                                 get_work_area()->set_focus_point(newpos);
 212                                 get_work_area()->set_zoom(get_work_area()->get_zoom()/zdiv);
 213                         }
 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 }