[英]How to markup a transparent pygtk pycairo window and save the combined image?
[英]How to get transparent background in window with PyGTK and PyCairo?
我一直在努力使用PyGTK創建一個沒有裝飾和透明背景的窗口。 然后我會用開羅繪制窗口的內容。 但我無法讓它發揮作用。
我嘗試了很多不同的方法,它們都失敗了,這就是其中之一
#!/usr/bin/env python
import pygtk
pygtk.require('2.0')
import gtk, sys, cairo
win = None
def expose (widget, event):
cr = widget.window.cairo_create()
#Start drawing
cr.set_operator(cairo.OPERATOR_CLEAR)
cr.set_source_rgba(0.5,1.0,0.0,0.5)
cr.rectangle(0, 0, 0.9, 0.8)
cr.fill()
def main (argc):
global win
win = gtk.Window()
win.set_decorated(False)
win.connect('delete_event', gtk.main_quit)
win.connect('expose-event', expose)
win.set_app_paintable(True)
win.show()
gtk.main()
if __name__ == '__main__':
sys.exit(main(sys.argv))
那么,最簡單的方法是什么?
所以,我實際上是自己想出來的。
這是一個有效的例子。 我已經評論了相關部分,以防其他人對如何做到這一點感興趣。
#!/usr/bin/env python
import pygtk
pygtk.require('2.0')
import gtk, sys, cairo
from math import pi
def expose (widget, event):
cr = widget.window.cairo_create()
# Sets the operator to clear which deletes everything below where an object is drawn
cr.set_operator(cairo.OPERATOR_CLEAR)
# Makes the mask fill the entire window
cr.rectangle(0.0, 0.0, *widget.get_size())
# Deletes everything in the window (since the compositing operator is clear and mask fills the entire window
cr.fill()
# Set the compositing operator back to the default
cr.set_operator(cairo.OPERATOR_OVER)
# Draw a fancy little circle for demonstration purpose
cr.set_source_rgba(0.5,1.0,0.0,1)
cr.arc(widget.get_size()[0]/2,widget.get_size()[1]/2,
widget.get_size()[0]/2,0,pi*2)
cr.fill()
def main (argc):
win = gtk.Window()
win.set_decorated(False)
# Makes the window paintable, so we can draw directly on it
win.set_app_paintable(True)
win.set_size_request(100, 100)
# This sets the windows colormap, so it supports transparency.
# This will only work if the wm support alpha channel
screen = win.get_screen()
rgba = screen.get_rgba_colormap()
win.set_colormap(rgba)
win.connect('expose-event', expose)
win.show()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.