/usr/share/pyshared/freevo/animation/transition.py is in python-freevo 1.9.2b2-4.2.
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# -----------------------------------------------------------------------
# transition.py - A transition animation, intended use: imageviewer
# Author: Viggo Fredriksen <viggo@katatonic.org>
# -----------------------------------------------------------------------
# $Id: transition.py 11905 2011-11-14 21:54:46Z adam $
#
# Notes:
# Todo:
#
# -----------------------------------------------------------------------
# Freevo - A Home Theater PC framework
# Copyright (C) 2002 Krister Lagerstrom, et al.
# Please see the file freevo/Docs/CREDITS for a complete list of authors.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MER-
# CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# -----------------------------------------------------------------------
import logging
logger = logging.getLogger("freevo.animation.transition")
import config
from base import BaseAnimation
import pygame, random
import kaa
class Transition(BaseAnimation):
"""
This class blends two surfaces.
Targeted to be finished within 1 second
"""
image = None
finished = False # flag for finished animation
surf_blend1 = None
"""@cvar: first surface"""
surf_blend2 = None
"""@cvar: second surface"""
def __init__(self, surf1, surf2, mode=-1, direction='vertical', fps=25, speed=1):
"""
Initialise an instance of the Transition class
@ivar surf1: Surface to blend with
@ivar surf2: New surface
@ivar mode: effect to use
@ivar direction: vertical/horizontal
"""
BaseAnimation.__init__(self, surf1.get_rect(), fps, bg_update=False)
_debug_('__init__(surf1=%r, surf2=%r, mode=%r, direction=%r, fps=%r)' % (surf1, surf2, mode, direction, fps), 2)
self.steps = fps
self.mode = mode
self.direction = direction
self.speed = speed
# WARNING: self.drawfuncs should not contain links to it's member
# functions because this results in circular dependencies and the
# Python garbage collector won't work
self.drawfuncs = { 0: 'draw_blend_alpha',
1: 'draw_wipe',
2: 'draw_wipe_alpha' }
self.surf_blend1 = surf1.convert()
self.surf_blend2 = surf2.convert()
self.inprogress = kaa.InProgress()
self.prepare()
def prepare(self):
_debug_('prepare()', 2)
# random effect
if self.mode == -1:
start = self.drawfuncs.keys()[0]
stop = self.drawfuncs.keys()[(len(self.drawfuncs.keys())-1)]
self.mode = random.randrange(start, stop, 1)
self.direction = random.choice( ['vertical', 'horizontal'] )
self.prepare()
# blend alpha effect
elif self.mode == 0:
step_size = 255.0 / self.steps
self.index_alpha = 0
self.blend_alphas = [int(x*step_size) for x in range(1, self.steps+1)]
self.blend_alphas.append(255) # The last step must be 255
# plain wipe effect
elif self.mode == 1:
self.offset_x = 0
self.offset_y = 0
self.surface.blit(self.surf_blend1, (0, 0))
if self.direction == 'vertical':
step = self.rect.height / self.steps
self.step_x = 0
self.step_y = step
else:
step = self.rect.width / self.steps
self.step_x = step
self.step_y = 0
# alpha wipe effect
elif self.mode == 2:
self.line = 0
self.size = self.surf_blend1.get_size()
self.surf_blend2 = self.surf_blend2.convert_alpha()
self.fade_rows = 10
self.fade_factor = int(256/self.fade_rows)
def draw(self):
_debug_('draw()', 2)
if self.finished:
return
getattr(self, self.drawfuncs[self.mode])()
def __finished(self):
self.finished = True
self.inprogress.finish(True)
def draw_blend_alpha(self):
_debug_('draw_blend_alpha()', 2)
alpha = self.blend_alphas[self.index_alpha]
self.surf_blend2.set_alpha(alpha)
self.surface.blit(self.surf_blend1, (0, 0))
self.surface.blit(self.surf_blend2, (0, 0))
self.index_alpha += self.speed
if self.index_alpha > len(self.blend_alphas) - 1:
self.__finished()
def draw_wipe(self):
"""
Plain wipe
"""
_debug_('draw_wipe()', 2)
if self.offset_x > self.rect.width:
self.offset_x = self.rect.width
self.__finished()
if self.offset_y > self.rect.height:
self.offset_y = self.rect.height
self.__finished()
x = self.offset_x
y = self.offset_y
w = self.step_x
h = self.step_y
if w == 0: w = self.rect.width
if h == 0: h = self.rect.height
self.surface.blit(self.surf_blend2, (x, y), (x, y, w, h))
self.offset_x += self.step_x
self.offset_y += self.step_y
def draw_wipe_alpha(self):
"""
Alpha transition wipe
This is _very_ slow atm.
XXX not working!
"""
_debug_('draw_wipe_alpha()', 2)
if self.line > self.size[0] - 1:
self.__finished()
for i in range(0, (self.line + self.fade_rows)):
# array with alphavals
arr = pygame.surfarray.pixels_alpha(self.surf_blend2)
#if (arr[i] <= self.fade_factor):
# arr[i] = 0
#else:
#arr[i] -= self.fade_factor
#for j in range(0, (self.size[0]-1)):
# if (arr[j][i] <= self.fade_factor):
# arr[j][i] = 0
# else:
# arr[j][i] -= self.fade_factor
"""
for i in range(0, self.fade_rows):
# Bounds check...
if((offset - i) < 0):
break
if((offset - i) > self.size[1] - 1):
continue
else:
for j in range(0, (self.size[0]-1)):
if (arr[j][offset-i] <= self.fade_factor):
arr[j][offset-i]=0
else:
arr[j][offset-i] -= self.fade_factor
"""
del arr
self.line += self.fade_rows
self.surface.blit(self.surf_blend1, (0, 0))
self.surface.blit(self.surf_blend2, (0, 0))
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