gzv.py

   1 # gzv.py - an user interface to generate-zooming-video
   2 #
   3 # Copyright (C) 2008  Lincoln de Sousa <lincoln@minaslivre.org>
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14
  15 import os
  16 import gtk
  17 import gtk.glade
  18 import gobject
  19 import math
  20 import cairo
  21 from ConfigParser import ConfigParser
  22
  23 _ = lambda x:x
  24
  25 class Ball(object):
  26     DEFAULT_WIDTH = 10
  27
  28     def __init__(self, x, y, r, name='', position=0, selected=False):
  29         self.position = position
  30         self.selected = selected
  31         self.x = int(x)
  32         self.y = int(y)
  33         self.radius = int(r)
  34         self.name = name
  35
  36 class BallManager(list):
  37     def __init__(self, *args, **kwargs):
  38         super(BallManager, self).__init__(*args, **kwargs)
  39
  40     def save_to_file(self, path):
  41         target = open(path, 'w')
  42         for i in self:
  43             target.write('%d,%d %d %s\n' % (i.x, i.y, i.radius, i.name))
  44         target.close()
  45
  46 class GladeLoader(object):
  47     def __init__(self, fname, root=''):
  48         self.ui = gtk.glade.XML(fname, root)
  49         self.ui.signal_autoconnect(self)
  50
  51     def get_widget(self, wname):
  52         return self.ui.get_widget(wname)
  53
  54     # little shortcut
  55     wid = get_widget
  56
  57     # glade callbacks
  58
  59     def gtk_widget_show(self, widget, *args):
  60         widget.show()
  61         return True
  62
  63     def gtk_widget_hide(self, widget, *args):
  64         widget.hide()
  65         return True
  66
  67     def gtk_main_quit(self, *args):
  68         gtk.main_quit()
  69
  70     def gtk_main(self, *args):
  71         gtk.main()
  72
  73 class Project(object):
  74     def __init__(self, image, width, height):
  75         self.image = image
  76         self.width = width
  77         self.height = height
  78         self.focus_points_file = ''
  79
  80     def save_to_file(self, path):
  81         if not self.focus_points_file:
  82             bn = os.path.basename(path)
  83             name = os.path.splitext(bn)[0]
  84             self.focus_points_file = \
  85                 os.path.join(os.path.dirname(path), name + '_fpf')
  86
  87         cp = ConfigParser()
  88         cp.add_section('Project')
  89         cp.set('Project', 'image', self.image)
  90         cp.set('Project', 'width', self.width)
  91         cp.set('Project', 'height', self.height)
  92         cp.set('Project', 'focus_points', self.focus_points_file)
  93
  94         cp.write(open(path, 'w'))
  95
  96     @staticmethod
  97     def parse_file(path):
  98         cp = ConfigParser()
  99         cp.read(path)
 100
 101         image = cp.get('Project', 'image')
 102         width = cp.getint('Project', 'width')
 103         height = cp.getint('Project', 'height')
 104         x = cp.getint('Project', 'height')
 105
 106         proj = Project(image, width, height)
 107         proj.focus_points_file = cp.get('Project', 'focus_points')
 108
 109         return proj
 110
 111 class NewProject(GladeLoader):
 112     def __init__(self, parent=None):
 113         super(NewProject, self).__init__('gzv.glade', 'new-project')
 114         self.dialog = self.wid('new-project')
 115         if parent:
 116             self.dialog.set_transient_for(parent)
 117
 118     def get_project(self):
 119         # This '1' was defined in the glade file
 120         if not self.dialog.run() == 1:
 121             return None
 122
 123         fname = self.wid('image').get_filename()
 124         width = self.wid('width').get_text()
 125         height = self.wid('height').get_text()
 126         return Project(fname, width, height)
 127
 128     def destroy(self):
 129         self.dialog.destroy()
 130
 131 class Gzv(GladeLoader):
 132     def __init__(self):
 133         super(Gzv, self).__init__('gzv.glade', 'main-window')
 134         self.window = self.wid('main-window')
 135         self.window.connect('delete-event', lambda *x: gtk.main_quit())
 136
 137         self.evtbox = self.wid('eventbox')
 138         self.evtbox.connect('button-press-event', self.button_press)
 139         self.evtbox.connect('button-release-event', self.button_release)
 140         self.evtbox.connect('motion-notify-event', self.motion_notify)
 141
 142         self.model = gtk.ListStore(int, str)
 143         self.treeview = self.wid('treeview')
 144         self.treeview.set_model(self.model)
 145         self.treeview.connect('button-press-event', self.select_fp)
 146
 147         self.draw = self.wid('draw')
 148         self.draw.connect_after('expose-event', self.expose_draw)
 149
 150         # Starting with an empty project with no image loaded
 151         self.project = None
 152         self.image = None
 153
 154         # This attr may be overriten, if so, call the method (load_balls_to_treeview)
 155         self.balls = BallManager()
 156
 157         self.load_balls_to_treeview()
 158         self.setup_treeview()
 159
 160         # drawing stuff
 161         self.start_x = -1
 162         self.start_y = -1
 163         self.radius = Ball.DEFAULT_WIDTH
 164
 165     def setup_treeview(self):
 166         self.model.connect('rows-reordered', self.on_rows_reordered)
 167
 168         renderer = gtk.CellRendererText()
 169         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 170         column.set_property('visible', False)
 171         self.treeview.append_column(column)
 172
 173         renderer = gtk.CellRendererText()
 174         renderer.connect('edited', self.on_cell_edited)
 175         renderer.set_property('editable', True)
 176         self.fpcolumn = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 177         self.treeview.append_column(self.fpcolumn)
 178
 179     def on_rows_reordered(self, *args):
 180         print
 181
 182     def on_cell_edited(self, renderer, path, value):
 183         self.balls[int(path)].name = value
 184         self.load_balls_to_treeview()
 185
 186     def new_project(self, button):
 187         proj = NewProject(self.window)
 188         project = proj.get_project()
 189         proj.destroy()
 190
 191         if project:
 192             self.load_project(project)
 193
 194     def open_project(self, *args):
 195         fc = gtk.FileChooserDialog(_('Choose a gzv project'), self.window,
 196                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 197                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 198         if fc.run() == gtk.RESPONSE_OK:
 199             proj_file = fc.get_filename()
 200             self.load_project(Project.parse_file(proj_file))
 201         fc.destroy()
 202
 203     def save_project(self, *args):
 204         fc = gtk.FileChooserDialog(_('Save project'), self.window,
 205                                    action=gtk.FILE_CHOOSER_ACTION_SAVE,
 206                                    buttons=(gtk.STOCK_CANCEL,
 207                                             gtk.RESPONSE_CANCEL,
 208                                             gtk.STOCK_SAVE,
 209                                             gtk.RESPONSE_OK))
 210         if fc.run() == gtk.RESPONSE_OK:
 211             self.project.save_to_file(fc.get_filename())
 212             self.balls.save_to_file(self.project.focus_points_file)
 213         fc.destroy()
 214
 215
 216     def load_project(self, project):
 217         self.project = project
 218         self.balls = self.load_balls_from_file(project.focus_points_file)
 219         self.image = project.image
 220
 221         # I'm loading a pixbuf first because I need to get its
 222         # dimensions this with a pixbuf is easier than with an image.
 223         try:
 224             pixbuf = gtk.gdk.pixbuf_new_from_file(project.image)
 225         except gobject.GError:
 226             msg = _("Couldn't recognize the image file format.")
 227             dialog = gtk.MessageDialog(self.window,
 228                                        gtk.DIALOG_MODAL,
 229                                        gtk.MESSAGE_ERROR,
 230                                        gtk.BUTTONS_CLOSE)
 231             dialog.set_markup(msg)
 232             dialog.run()
 233             dialog.destroy()
 234             return self.unload_project()
 235
 236         self.draw.set_from_pixbuf(pixbuf)
 237         self.load_balls_to_treeview()
 238
 239     def unload_project(self):
 240         self.project = None
 241         self.image = None
 242         self.balls = BallManager()
 243         self.draw.queue_draw()
 244
 245     def load_balls_to_treeview(self):
 246         self.model.clear()
 247         for i in self.balls:
 248             self.model.append([i.position, i.name])
 249
 250     def load_balls_from_file(self, fname):
 251         balls = BallManager()
 252         if not os.path.exists(fname):
 253             return balls
 254
 255         for index, line in enumerate(file(fname)):
 256             if not line:
 257                 continue
 258             pos, radius, name = line.split(None, 2)
 259             x, y = pos.split(',')
 260             balls.append(Ball(x, y, radius, name.strip(), index))
 261         return balls
 262
 263     def remove_fp(self, *args):
 264         selection = self.treeview.get_selection()
 265         model, path = selection.get_selected()
 266         if path:
 267             position = model[path][0]
 268             for i in self.balls:
 269                 if i.position == int(position):
 270                     self.balls.remove(i)
 271             del model[path]
 272             self.draw.queue_draw()
 273
 274     def select_fp(self, treeview, event):
 275         path, column, x, y = \
 276             self.treeview.get_path_at_pos(int(event.x), int(event.y))
 277         if path:
 278             model = self.treeview.get_model()
 279             ball = self.balls[model[path][0]]
 280
 281             # making sure that only one ball is selected
 282             for i in self.balls:
 283                 i.selected = False
 284             ball.selected = True
 285
 286             self.draw.queue_draw()
 287
 288     def save_fp_list(self, *args):
 289         assert self.project is not None
 290
 291         # if the project has no
 292         if self.project and not self.project.focus_points_file:
 293             fc = gtk.FileChooserDialog(_('Save the focus points file'),
 294                                        self.window,
 295                                        action=gtk.FILE_CHOOSER_ACTION_SAVE,
 296                                        buttons=(gtk.STOCK_CANCEL,
 297                                                 gtk.RESPONSE_CANCEL,
 298                                                 gtk.STOCK_SAVE,
 299                                                 gtk.RESPONSE_OK))
 300             if fc.run() == gtk.RESPONSE_OK:
 301                 self.project.focus_points_file = fc.get_filename()
 302                 fc.destroy()
 303             else:
 304                 fc.destroy()
 305                 return
 306
 307         self.balls.save_to_file(self.project.focus_points_file)
 308
 309     def expose_draw(self, draw, event):
 310         if not self.image:
 311             return
 312
 313         for i in self.balls:
 314             self.draw_ball(i)
 315
 316         if self.start_x < 0:
 317             return False
 318
 319         ball = Ball(self.start_x, self.start_y, self.radius)
 320         self.draw_ball(ball)
 321
 322         return False
 323
 324     def draw_ball(self, ball):
 325         ctx = self.draw.window.cairo_create()
 326         ctx.arc(ball.x, ball.y, ball.radius, 0, 64*math.pi)
 327         ctx.set_source_rgba(0.0, 0.0, 0.5, 0.4)
 328         ctx.fill()
 329
 330         if ball.selected:
 331             ctx.set_source_rgba(0.0, 0.5, 0.0, 0.4)
 332             ctx.set_line_width(5)
 333             ctx.arc(ball.x, ball.y, ball.radius+1, 0, 64*math.pi)
 334             ctx.stroke()
 335
 336     def button_press(self, widget, event):
 337         if event.button == 1:
 338             self.start_x = event.x
 339             self.start_y = event.y
 340             self.last_x = event.x
 341
 342     def button_release(self, widget, event):
 343         if event.button == 1:
 344             self.finish_drawing()
 345
 346     def motion_notify(self, widget, event):
 347         self.draw.queue_draw()
 348
 349         if event.x > self.last_x:
 350             self.radius += 3
 351         else:
 352             self.radius -= 3
 353
 354         self.last_x = event.x
 355
 356     def finish_drawing(self):
 357         position = len(self.balls)
 358         ball = Ball(self.start_x, self.start_y, self.radius, '', position)
 359         self.balls.append(ball)
 360         self.model.append([position, ''])
 361         self.treeview.set_cursor(str(position), self.fpcolumn, True)
 362
 363         # reseting to the default coordenades
 364         self.start_x = -1
 365         self.start_y = -1
 366         self.radius = Ball.DEFAULT_WIDTH
 367
 368 if __name__ == '__main__':
 369     Gzv().window.show_all()
 370     gtk.main()