synfig-studio/src/gui/states/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 "state_normal.h"
  42 #include "event_mouse.h"
  43 #include "canvasview.h"
  44 #include "workarea.h"
  45 #include "app.h"
  46 #include "toolbox.h"
  47 #include <synfigapp/main.h>
  48
  49 #include "general.h"
  50
  51 #endif
  52
  53 /* === U S I N G =========================================================== */
  54
  55 using namespace std;
  56 using namespace etl;
  57 using namespace synfig;
  58 using namespace studio;
  59
  60 /* === M A C R O S ========================================================= */
  61
  62 /* === G L O B A L S ======================================================= */
  63 StateZoom studio::state_zoom;
  64
  65 const float ZOOMFACTOR = 1.25f;
  66
  67 /* === C L A S S E S & S T R U C T S ======================================= */
  68
  69 class studio::StateZoom_Context : public sigc::trackable
  70 {
  71         etl::handle<CanvasView> canvas_view_;
  72         CanvasView::IsWorking is_working;
  73
  74         Point p1,p2;
  75
  76         bool prev_workarea_layer_status_;
  77
  78 public:
  79
  80         //events
  81         Smach::event_result event_stop_handler(const Smach::event& x);
  82         Smach::event_result event_refresh_handler(const Smach::event& x);
  83         Smach::event_result event_mouse_click_handler(const Smach::event& x);
  84
  85         //constructor destructor
  86         StateZoom_Context(CanvasView* canvas_view);
  87         ~StateZoom_Context();
  88
  89         //Canvas interaction
  90         const etl::handle<CanvasView>& get_canvas_view()const{return canvas_view_;}
  91         etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const{return canvas_view_->canvas_interface();}
  92         synfig::Canvas::Handle get_canvas()const{return canvas_view_->get_canvas();}
  93         WorkArea * get_work_area()const{return canvas_view_->get_work_area();}
  94
  95         //void zoom(const Point& p1, const Point& p2);
  96
  97 };      // END of class StateZoom_Context
  98
  99 /* === M E T H O D S ======================================================= */
 100
 101 StateZoom::StateZoom():
 102         Smach::state<StateZoom_Context>("zoom")
 103 {
 104         insert(event_def(EVENT_STOP,&StateZoom_Context::event_stop_handler));
 105         insert(event_def(EVENT_REFRESH,&StateZoom_Context::event_refresh_handler));
 106         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,&StateZoom_Context::event_mouse_click_handler));
 107         //insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,&StateZoom_Context::event_mouse_click_handler));
 108         insert(event_def(EVENT_WORKAREA_BOX,&StateZoom_Context::event_mouse_click_handler));
 109         //insert(event_def(EVENT_WORKAREA_BUTTON_CLICK,&StateZoom_Context::event_mouse_click_handler));
 110         insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_UP,&StateZoom_Context::event_mouse_click_handler));
 111 }
 112
 113 StateZoom::~StateZoom()
 114 {
 115 }
 116
 117 StateZoom_Context::StateZoom_Context(CanvasView* canvas_view):
 118         canvas_view_(canvas_view),
 119         is_working(*canvas_view),
 120         prev_workarea_layer_status_(get_work_area()->get_allow_layer_clicks())
 121 {
 122         // Turn off layer clicking
 123         get_work_area()->set_allow_layer_clicks(false);
 124
 125         // clear out the ducks
 126         get_work_area()->clear_ducks(); //???
 127
 128         // Refresh the work area
 129         get_work_area()->queue_draw();
 130
 131         // Hide the tables if they are showing
 132         //prev_table_status=get_canvas_view()->tables_are_visible();
 133         //if(prev_table_status)get_canvas_view()->hide_tables();
 134
 135         // Disable the time bar
 136         //get_canvas_view()->set_sensitive_timebar(false);
 137
 138         // Connect a signal
 139         //get_work_area()->signal_user_click().connect(sigc::mem_fun(*this,&studio::StateZoom_Context::on_user_click));
 140         get_work_area()->set_cursor(Gdk::CROSSHAIR);
 141
 142         App::toolbox->refresh();
 143 }
 144
 145 StateZoom_Context::~StateZoom_Context()
 146 {
 147         // Restore layer clicking
 148         get_work_area()->set_allow_layer_clicks(prev_workarea_layer_status_);
 149         get_work_area()->reset_cursor();
 150
 151         // Enable the time bar
 152         //get_canvas_view()->set_sensitive_timebar(true);
 153
 154         // Bring back the tables if they were out before
 155         //if(prev_table_status)get_canvas_view()->show_tables();
 156
 157         // Refresh the work area
 158         get_work_area()->queue_draw();
 159
 160         App::toolbox->refresh();
 161
 162         get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
 163 }
 164
 165 Smach::event_result
 166 StateZoom_Context::event_stop_handler(const Smach::event& /*x*/)
 167 {
 168         //throw Smach::egress_exception();
 169         throw &state_normal;
 170         return Smach::RESULT_OK;
 171 }
 172
 173 Smach::event_result
 174 StateZoom_Context::event_refresh_handler(const Smach::event& /*x*/)
 175 {
 176         return Smach::RESULT_ACCEPT;
 177 }
 178
 179 Smach::event_result
 180 StateZoom_Context::event_mouse_click_handler(const Smach::event& x)
 181 {
 182         if(x.key==EVENT_WORKAREA_BOX)
 183         {
 184                 const EventBox& event(*reinterpret_cast<const EventBox*>(&x));
 185
 186                 if(event.button==BUTTON_LEFT)
 187                 {
 188                         Point tl = get_work_area()->get_window_tl();
 189                         Point br = get_work_area()->get_window_br();
 190                         Vector  window_span = br - tl, window_middle = (br+tl)/2;
 191                         Vector  box_span = event.p2 - event.p1, box_middle = (event.p1+event.p2)/2;
 192                         Point newpos;
 193                         float zoom;
 194
 195                         if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
 196                         {
 197                                 if (window_span[0] == 0 || window_span[1] == 0) zoom = 1;
 198                                 else zoom = max(abs(box_span[0]/window_span[0]), abs(box_span[1]/window_span[1]));
 199
 200                                 // focus_point is -1 times the real position for some reason...
 201                                 // center the window so the old contents fill the drawn box
 202                                 newpos = -((window_middle - box_middle)/zoom + window_middle);
 203                         }
 204                         else                            // zoom in
 205                         {
 206                                 if (box_span[0] == 0 || box_span[1] == 0) zoom = 1;
 207                                 else zoom = min(abs(window_span[0]/box_span[0]), abs(window_span[1]/box_span[1]));
 208
 209                                 // center the window at the center of the box
 210                                 newpos = -(-get_work_area()->get_focus_point() + (box_middle - window_middle));
 211                         }
 212
 213                         get_work_area()->set_focus_point(newpos);
 214                         get_work_area()->set_zoom(get_work_area()->get_zoom()*zoom);
 215
 216                         return Smach::RESULT_ACCEPT;
 217                 }
 218         }
 219
 220         if(x.key==EVENT_WORKAREA_MOUSE_BUTTON_UP)
 221         {
 222                 const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
 223
 224                 if(event.button==BUTTON_LEFT)
 225                 {
 226                         Point evpos;
 227
 228                         //make the event pos be in the same space...
 229                         //   The weird ass inverted center normalized space...
 230                         {
 231                                 const Point realcenter = (get_work_area()->get_window_tl() + get_work_area()->get_window_br())/2;
 232                                 evpos = -(event.pos - realcenter) + get_work_area()->get_focus_point();
 233                         }
 234
 235                         /*      Zooming:
 236                                 focus point must zoom about the point evpos...
 237
 238                                 trans about an origin not 0:
 239                                 p' = A(p - o) + o
 240                         */
 241
 242                         Vector v = get_work_area()->get_focus_point() - evpos;
 243
 244                         if(event.modifier & Gdk::CONTROL_MASK) //zoom out...
 245                         {
 246                                 v*=ZOOMFACTOR;
 247                                 //get_work_area()->zoom_out();
 248                                 get_work_area()->set_focus_point(evpos + v);
 249                                 get_work_area()->set_zoom(get_work_area()->get_zoom()/ZOOMFACTOR);
 250                         }else //zoom in
 251                         {
 252                                 v/=ZOOMFACTOR;
 253                                 //get_work_area()->zoom_in();
 254                                 get_work_area()->set_focus_point(evpos + v);
 255                                 get_work_area()->set_zoom(get_work_area()->get_zoom()*ZOOMFACTOR);
 256                         }
 257
 258                         return Smach::RESULT_ACCEPT;
 259                 }
 260         }
 261
 262         return Smach::RESULT_OK;
 263 }