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 - p2.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
 238     def load_project(self, project):
 239         self.project = project
 240         self.balls = self.load_balls_from_file(project.focus_points_file)
 241         self.image = project.image
 242
 243         # I'm loading a pixbuf first because I need to get its
 244         # dimensions this with a pixbuf is easier than with an image.
 245         try:
 246             pixbuf = gtk.gdk.pixbuf_new_from_file(project.image)
 247         except gobject.GError:
 248             msg = _("Couldn't recognize the image file format.")
 249             dialog = gtk.MessageDialog(self.window,
 250                                        gtk.DIALOG_MODAL,
 251                                        gtk.MESSAGE_ERROR,
 252                                        gtk.BUTTONS_CLOSE)
 253             dialog.set_markup(msg)
 254             dialog.run()
 255             dialog.destroy()
 256             return self.unload_project()
 257
 258         self.draw.set_from_pixbuf(pixbuf)
 259         self.load_balls_to_treeview()
 260
 261     def unload_project(self):
 262         self.project = None
 263         self.image = None
 264         self.balls = BallManager()
 265         self.draw.queue_draw()
 266
 267     def load_balls_to_treeview(self):
 268         self.model.clear()
 269         for i in self.balls:
 270             self.model.append([i.position, i.name])
 271
 272     def load_balls_from_file(self, fname):
 273         balls = BallManager()
 274         if not os.path.exists(fname):
 275             return balls
 276
 277         for index, line in enumerate(file(fname)):
 278             if not line:
 279                 continue
 280             pos, radius, name = line.split(None, 2)
 281             x, y = pos.split(',')
 282             balls.append(Ball(x, y, radius, name.strip(), index))
 283         return balls
 284
 285     def remove_fp(self, *args):
 286         selection = self.treeview.get_selection()
 287         model, path = selection.get_selected()
 288         if path:
 289             position = model[path][0]
 290             for i in self.balls:
 291                 if i.position == int(position):
 292                     self.balls.remove(i)
 293             del model[path]
 294             self.draw.queue_draw()
 295
 296     def select_fp(self, treeview, event):
 297         path, column, x, y = \
 298             self.treeview.get_path_at_pos(int(event.x), int(event.y))
 299         if path:
 300             model = self.treeview.get_model()
 301             ball = self.balls[model[path][0]]
 302
 303             # making sure that only one ball is selected
 304             for i in self.balls:
 305                 i.selected = False
 306             ball.selected = True
 307
 308             self.draw.queue_draw()
 309
 310     def save_fp_list(self, *args):
 311         assert self.project is not None
 312
 313         # if the project has no
 314         if self.project and not self.project.focus_points_file:
 315             fc = gtk.FileChooserDialog(_('Save the focus points file'),
 316                                        self.window,
 317                                        action=gtk.FILE_CHOOSER_ACTION_SAVE,
 318                                        buttons=(gtk.STOCK_CANCEL,
 319                                                 gtk.RESPONSE_CANCEL,
 320                                                 gtk.STOCK_SAVE,
 321                                                 gtk.RESPONSE_OK))
 322             if fc.run() == gtk.RESPONSE_OK:
 323                 self.project.focus_points_file = fc.get_filename()
 324                 fc.destroy()
 325             else:
 326                 fc.destroy()
 327                 return
 328
 329         self.balls.save_to_file(self.project.focus_points_file)
 330
 331     def expose_draw(self, draw, event):
 332         if not self.image:
 333             return
 334
 335         for i in self.balls:
 336             self.draw_ball(i)
 337
 338         if self.start_x < 0:
 339             return False
 340
 341         if self.new_ball:
 342             ball = Ball(self.start_x, self.start_y, self.radius)
 343             self.draw_ball(ball)
 344
 345         return False
 346
 347     def draw_ball(self, ball):
 348         ctx = self.draw.window.cairo_create()
 349         ctx.arc(ball.p.x, ball.p.y, ball.radius, 0, 64*math.pi)
 350         ctx.set_source_rgba(0.0, 0.0, 0.5, 0.4)
 351         ctx.fill()
 352
 353         if ball.selected:
 354             ctx.set_source_rgba(0.0, 0.5, 0.0, 0.4)
 355             ctx.set_line_width(5)
 356             ctx.arc(ball.p.x, ball.p.y, ball.radius+1, 0, 64*math.pi)
 357             ctx.stroke()
 358
 359     def button_press(self, widget, event):
 360         self.new_ball = True
 361
 362         self.last_x = event.x
 363         self.last_y = event.y
 364
 365         if event.button == 1:
 366             for i in self.balls:
 367                 p1 = Point(event.x, event.y)
 368                 p2 = Point(i.p.x, i.p.y)
 369                 if Point.pythagorean(p1, p2) < i.radius:
 370                     self.last_x = event.x - i.p.x
 371                     self.last_y = event.y - i.p.y
 372
 373                     self.new_ball = False
 374                     self.move_ball = i
 375                     break
 376
 377             self.start_x = event.x
 378             self.start_y = event.y
 379
 380     def button_release(self, widget, event):
 381         self.move_ball = None
 382
 383         if event.button == 1:
 384             self.finish_drawing()
 385
 386     def motion_notify(self, widget, event):
 387         if not self.new_ball:
 388             return
 389
 390         self.draw.queue_draw()
 391
 392         if event.x > self.last_x:
 393             self.radius += 3
 394         else:
 395             self.radius -= 3
 396
 397         self.last_x = event.x
 398
 399     def ball_motion(self, widget, event):
 400         if not self.move_ball:
 401             return
 402
 403         self.move_ball.p.x += (event.x - self.move_ball.p.x)
 404         self.move_ball.p.y += (event.y - self.move_ball.p.y)
 405
 406         self.draw.queue_draw()
 407
 408         self.last_x = event.x - self.move_ball.p.x
 409         self.last_y = event.y - self.move_ball.p.y
 410
 411     def finish_drawing(self):
 412         if self.new_ball:
 413             position = len(self.balls)
 414             ball = Ball(self.start_x, self.start_y, self.radius, '', position)
 415             self.balls.append(ball)
 416             self.model.append([position, ''])
 417             self.treeview.set_cursor(str(position), self.fpcolumn, True)
 418             self.new_ball = False
 419
 420         # reseting to the default coordenades
 421         self.start_x = -1
 422         self.start_y = -1
 423         self.radius = Ball.DEFAULT_WIDTH
 424
 425 if __name__ == '__main__':
 426     Gzv().show()
 427     gtk.main()