gzv.py

   1 # -*- coding: utf-8; -*-
   2 # gzv.py - an user interface to generate-zooming-video
   3 #
   4 # Copyright (C) 2008  Lincoln de Sousa <lincoln@minaslivre.org>
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 import os
  17 import gtk
  18 import gtk.glade
  19 import gobject
  20 import math
  21 import cairo
  22 from ConfigParser import ConfigParser
  23
  24 _ = lambda x:x
  25
  26 class Point(object):
  27     def __init__(self, x, y):
  28         self.x = x
  29         self.y = y
  30
  31     @staticmethod
  32     def pythagorean(p1, p2):
  33         return math.sqrt((p2.x - p1.x)**2 + (p2.y - p1.y)**2)
  34
  35 class Ball(object):
  36     DEFAULT_WIDTH = 10
  37
  38     def __init__(self, x, y, r, name='', position=0, selected=False):
  39         self.position = position
  40         self.selected = selected
  41         self.p = Point(int(x), int(y))
  42         self.radius = int(r)
  43         self.name = name
  44
  45 class BallManager(list):
  46     def __init__(self, *args, **kwargs):
  47         super(BallManager, self).__init__(*args, **kwargs)
  48
  49     def save_to_file(self, path):
  50         target = open(path, 'w')
  51         for i in self:
  52             target.write('%d,%d %d %s\n' % (i.p.x, i.p.y, i.radius, i.name))
  53         target.close()
  54
  55 class GladeLoader(object):
  56     def __init__(self, fname, root=''):
  57         self.ui = gtk.glade.XML(fname, root)
  58         self.ui.signal_autoconnect(self)
  59
  60     def get_widget(self, wname):
  61         return self.ui.get_widget(wname)
  62
  63     # little shortcut
  64     wid = get_widget
  65
  66     # glade callbacks
  67
  68     def gtk_widget_show(self, widget, *args):
  69         widget.show()
  70         return True
  71
  72     def gtk_widget_hide(self, widget, *args):
  73         widget.hide()
  74         return True
  75
  76     def gtk_main_quit(self, *args):
  77         gtk.main_quit()
  78
  79     def gtk_main(self, *args):
  80         gtk.main()
  81
  82 class Project(object):
  83     def __init__(self, image, width, height):
  84         self.image = image
  85         self.width = width
  86         self.height = height
  87         self.focus_points_file = ''
  88
  89     def save_to_file(self, path):
  90         if not self.focus_points_file:
  91             bn = os.path.basename(path)
  92             name = os.path.splitext(bn)[0]
  93             self.focus_points_file = \
  94                 os.path.join(os.path.dirname(path), name + '_fpf')
  95
  96         cp = ConfigParser()
  97         cp.add_section('Project')
  98         cp.set('Project', 'image', self.image)
  99         cp.set('Project', 'width', self.width)
 100         cp.set('Project', 'height', self.height)
 101         cp.set('Project', 'focus_points', self.focus_points_file)
 102
 103         cp.write(open(path, 'w'))
 104
 105     @staticmethod
 106     def parse_file(path):
 107         cp = ConfigParser()
 108         cp.read(path)
 109
 110         image = cp.get('Project', 'image')
 111         width = cp.getint('Project', 'width')
 112         height = cp.getint('Project', 'height')
 113         x = cp.getint('Project', 'height')
 114
 115         proj = Project(image, width, height)
 116         proj.focus_points_file = cp.get('Project', 'focus_points')
 117
 118         return proj
 119
 120 class NewProject(GladeLoader):
 121     def __init__(self, parent=None):
 122         super(NewProject, self).__init__('gzv.glade', 'new-project')
 123         self.dialog = self.wid('new-project')
 124         if parent:
 125             self.dialog.set_transient_for(parent)
 126
 127     def get_project(self):
 128         # This '1' was defined in the glade file
 129         if not self.dialog.run() == 1:
 130             return None
 131
 132         fname = self.wid('image').get_filename()
 133         width = self.wid('width').get_text()
 134         height = self.wid('height').get_text()
 135         return Project(fname, width, height)
 136
 137     def destroy(self):
 138         self.dialog.destroy()
 139
 140 class Gzv(GladeLoader):
 141     def __init__(self):
 142         super(Gzv, self).__init__('gzv.glade', 'main-window')
 143         self.window = self.wid('main-window')
 144         self.window.connect('delete-event', lambda *x: gtk.main_quit())
 145
 146         self.evtbox = self.wid('eventbox')
 147         self.evtbox.connect('button-press-event', self.button_press)
 148         self.evtbox.connect('button-release-event', self.button_release)
 149         self.evtbox.connect('motion-notify-event', self.motion_notify)
 150         self.evtbox.connect('motion-notify-event', self.ball_motion)
 151
 152         # making it possible to grab motion events when the mouse is
 153         # over the widget.
 154         self.evtbox.set_events(gtk.gdk.POINTER_MOTION_MASK)
 155
 156         self.model = gtk.ListStore(int, str)
 157         self.treeview = self.wid('treeview')
 158         self.treeview.set_model(self.model)
 159         self.treeview.connect('button-press-event', self.select_fp)
 160
 161         self.draw = self.wid('draw')
 162         self.draw.connect_after('expose-event', self.expose_draw)
 163
 164         # Starting with an empty project with no image loaded
 165         self.project = None
 166         self.image = None
 167
 168         # This attr may be overriten, if so, call the method (load_balls_to_treeview)
 169         self.balls = BallManager()
 170
 171         self.load_balls_to_treeview()
 172         self.setup_treeview()
 173
 174         self.new_ball = False
 175         self.move_ball = None
 176
 177         # drawing stuff
 178         self.start_x = -1
 179         self.start_y = -1
 180         self.last_x = -1
 181         self.last_y = -1
 182         self.radius = Ball.DEFAULT_WIDTH
 183
 184     def show(self):
 185         self.window.show_all()
 186
 187     def setup_treeview(self):
 188         self.model.connect('rows-reordered', self.on_rows_reordered)
 189
 190         renderer = gtk.CellRendererText()
 191         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 192         column.set_property('visible', False)
 193         self.treeview.append_column(column)
 194
 195         renderer = gtk.CellRendererText()
 196         renderer.connect('edited', self.on_cell_edited)
 197         renderer.set_property('editable', True)
 198         self.fpcolumn = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 199         self.treeview.append_column(self.fpcolumn)
 200
 201     def on_rows_reordered(self, *args):
 202         print
 203
 204     def on_cell_edited(self, renderer, path, value):
 205         self.balls[int(path)].name = value
 206         self.load_balls_to_treeview()
 207
 208     def new_project(self, button):
 209         proj = NewProject(self.window)
 210         project = proj.get_project()
 211         proj.destroy()
 212
 213         if project:
 214             self.load_project(project)
 215
 216     def open_project(self, *args):
 217         fc = gtk.FileChooserDialog(_('Choose a gzv project'), self.window,
 218                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 219                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 220         if fc.run() == gtk.RESPONSE_OK:
 221             proj_file = fc.get_filename()
 222             self.load_project(Project.parse_file(proj_file))
 223         fc.destroy()
 224
 225     def save_project(self, *args):
 226         fc = gtk.FileChooserDialog(_('Save project'), self.window,
 227                                    action=gtk.FILE_CHOOSER_ACTION_SAVE,
 228                                    buttons=(gtk.STOCK_CANCEL,
 229                                             gtk.RESPONSE_CANCEL,
 230                                             gtk.STOCK_SAVE,
 231                                             gtk.RESPONSE_OK))
 232         if fc.run() == gtk.RESPONSE_OK:
 233             self.project.save_to_file(fc.get_filename())
 234             self.balls.save_to_file(self.project.focus_points_file)
 235         fc.destroy()
 236
 237     def load_project(self, project):
 238         self.project = project
 239         self.balls = self.load_balls_from_file(project.focus_points_file)
 240         self.image = project.image
 241
 242         # I'm loading a pixbuf first because I need to get its
 243         # dimensions this with a pixbuf is easier than with an image.
 244         try:
 245             pixbuf = gtk.gdk.pixbuf_new_from_file(project.image)
 246         except gobject.GError:
 247             msg = _("Couldn't recognize the image file format.")
 248             dialog = gtk.MessageDialog(self.window,
 249                                        gtk.DIALOG_MODAL,
 250                                        gtk.MESSAGE_ERROR,
 251                                        gtk.BUTTONS_CLOSE)
 252             dialog.set_markup(msg)
 253             dialog.run()
 254             dialog.destroy()
 255             return self.unload_project()
 256
 257         self.draw.set_from_pixbuf(pixbuf)
 258         self.load_balls_to_treeview()
 259         self.set_widgets_sensitivity(True)
 260
 261     def unload_project(self):
 262         self.project = None
 263         self.image = None
 264         self.balls = BallManager()
 265         self.draw.queue_draw()
 266         self.set_widgets_sensitivity(False)
 267
 268     def set_widgets_sensitivity(self, sensitive):
 269         for i in 'toolbutton1', 'toolbutton5', 'scrolledwindow1', \
 270                 'hbox2', 'imagemenuitem3':
 271             self.wid(i).set_sensitive(sensitive)
 272
 273     def load_balls_to_treeview(self):
 274         self.model.clear()
 275         for i in self.balls:
 276             self.model.append([i.position, i.name])
 277
 278     def load_balls_from_file(self, fname):
 279         balls = BallManager()
 280         if not os.path.exists(fname):
 281             return balls
 282
 283         for index, line in enumerate(file(fname)):
 284             if not line:
 285                 continue
 286             pos, radius, name = line.split(None, 2)
 287             x, y = pos.split(',')
 288             balls.append(Ball(x, y, radius, name.strip(), index))
 289         return balls
 290
 291     def remove_fp(self, *args):
 292         selection = self.treeview.get_selection()
 293         model, path = selection.get_selected()
 294         if path:
 295             position = model[path][0]
 296             for i in self.balls:
 297                 if i.position == int(position):
 298                     self.balls.remove(i)
 299             del model[path]
 300             self.draw.queue_draw()
 301
 302     def select_fp(self, treeview, event):
 303         path, column, x, y = \
 304             self.treeview.get_path_at_pos(int(event.x), int(event.y))
 305         if path:
 306             model = self.treeview.get_model()
 307             ball = self.balls[model[path][0]]
 308
 309             # making sure that only one ball is selected
 310             for i in self.balls:
 311                 i.selected = False
 312             ball.selected = True
 313
 314             # available space to the image
 315             w = self.evtbox.get_allocation().width
 316             h = self.evtbox.get_allocation().height
 317
 318             # point begining from the left image border
 319             wib = self.point_with_border(ball)
 320
 321             print wib.x, w
 322
 323             self.wid('viewport').get_vadjustment().value = wib.x # + (w / 2)
 324             self.wid('viewport').get_hadjustment().value = wib.y # + (h / 2)
 325
 326             self.draw.queue_draw()
 327
 328     def select_fp_from_image(self, ball):
 329         selection = self.treeview.get_selection()
 330         selection.select_path(str(ball.position))
 331
 332         # making sure that only one ball is selected
 333         for i in self.balls:
 334             i.selected = False
 335         ball.selected = True
 336
 337         self.draw.queue_draw()
 338
 339     def save_fp_list(self, *args):
 340         assert self.project is not None
 341
 342         # if the project has no
 343         if self.project and not self.project.focus_points_file:
 344             fc = gtk.FileChooserDialog(_('Save the focus points file'),
 345                                        self.window,
 346                                        action=gtk.FILE_CHOOSER_ACTION_SAVE,
 347                                        buttons=(gtk.STOCK_CANCEL,
 348                                                 gtk.RESPONSE_CANCEL,
 349                                                 gtk.STOCK_SAVE,
 350                                                 gtk.RESPONSE_OK))
 351             if fc.run() == gtk.RESPONSE_OK:
 352                 self.project.focus_points_file = fc.get_filename()
 353                 fc.destroy()
 354             else:
 355                 fc.destroy()
 356                 return
 357
 358         self.balls.save_to_file(self.project.focus_points_file)
 359
 360     def expose_draw(self, draw, event):
 361         if not self.image:
 362             return
 363
 364         for i in self.balls:
 365             self.draw_ball(i)
 366
 367         if self.start_x < 0:
 368             return False
 369
 370         if self.new_ball:
 371             ball = Ball(self.start_x, self.start_y, self.radius)
 372             self.draw_ball(ball)
 373
 374         return False
 375
 376     def point_with_border(self, ball):
 377         iw, ih = self.draw.size_request()
 378         w = self.draw.get_allocation().width
 379         h = self.draw.get_allocation().height
 380
 381         x = ((w / 2) - (iw / 2)) + ball.p.x
 382         y = ((h / 2) - (ih / 2)) + ball.p.y
 383         return Point(x, y)
 384
 385     def point_without_border(self, point):
 386         iw, ih = self.draw.size_request()
 387         w = self.draw.get_allocation().width
 388         h = self.draw.get_allocation().height
 389
 390         x = point.x - ((w / 2) - (iw / 2))
 391         y = point.y - ((h / 2) - (ih / 2))
 392         return Point(x, y)
 393
 394     def draw_ball(self, ball):
 395         ctx = self.draw.window.cairo_create()
 396         ctx.arc(self.point_with_border(ball).x,
 397                 self.point_with_border(ball).y,
 398                 ball.radius, 0, 64*math.pi)
 399         ctx.set_source_rgba(0.0, 0.0, 0.5, 0.4)
 400         ctx.fill()
 401
 402         if ball.selected:
 403             ctx.set_source_rgba(0.0, 0.5, 0.0, 0.4)
 404             ctx.set_line_width(5)
 405             ctx.arc(self.point_with_border(ball).x,
 406                     self.point_with_border(ball).y,
 407                     ball.radius+1, 0, 64*math.pi)
 408             ctx.stroke()
 409
 410     def button_press(self, widget, event):
 411         self.new_ball = True
 412
 413         self.last_x = event.x
 414         self.last_y = event.y
 415
 416         if event.button == 1:
 417             for i in self.balls:
 418                 p1 = Point(event.x, event.y)
 419                 p2 = self.point_with_border(i)
 420                 if Point.pythagorean(p1, p2) < i.radius:
 421                     self.last_x = event.x - i.p.x
 422                     self.last_y = event.y - i.p.y
 423                     self.select_fp_from_image(i)
 424
 425                     self.new_ball = False
 426                     self.move_ball = i
 427                     break
 428
 429             self.start_x = self.point_without_border(event).x
 430             self.start_y = self.point_without_border(event).y
 431
 432     def button_release(self, widget, event):
 433         self.move_ball = None
 434
 435         if event.button == 1:
 436             self.finish_drawing()
 437
 438     def motion_notify(self, widget, event):
 439         if not self.new_ball:
 440             return
 441
 442         self.draw.queue_draw()
 443
 444         if event.x > self.last_x:
 445             self.radius += 3
 446         else:
 447             self.radius -= 3
 448
 449         self.last_x = event.x
 450
 451     def ball_motion(self, widget, event):
 452         if not self.move_ball:
 453             return
 454
 455         self.move_ball.p.x = self.point_without_border(event).x
 456         self.move_ball.p.y = self.point_without_border(event).y
 457
 458         self.draw.queue_draw()
 459
 460     def finish_drawing(self):
 461         if self.new_ball:
 462             position = len(self.balls)
 463             ball = Ball(self.start_x, self.start_y, self.radius, '', position)
 464             self.balls.append(ball)
 465             self.model.append([position, ''])
 466             self.treeview.set_cursor(str(position), self.fpcolumn, True)
 467             self.new_ball = False
 468
 469         # reseting to the default coordenades
 470         self.start_x = -1
 471         self.start_y = -1
 472         self.radius = Ball.DEFAULT_WIDTH
 473
 474 if __name__ == '__main__':
 475     Gzv().show()
 476     gtk.main()