开罗示例适用于Python 2.7，但不适用于Python 3 [英] Cairo example works with Python 2.7 but does not work in Python 3

问题描述

最简单的例子。我们通过Gtk创建一个窗口，在其中添加用于绘制Gtk.DrawingArea的区域，然后在其中通过开罗绘制文本。

The simplest example. We create a window by means of Gtk, we add there area for drawing of Gtk.DrawingArea and on it we draw the text by means of Cairo.

示例：

#!/usr/bin/env python
from gi.repository import Gtk
import cairo

class MyWindow (Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title='MyWindow')

        darea = Gtk.DrawingArea()
        darea.connect('draw', self.on_draw)
        self.add(darea)

    def on_draw(self, widget, ctx):
        ctx.set_source_rgb(0, 0, 0)
        ctx.select_font_face("Sans", cairo.FONT_SLANT_NORMAL,
            cairo.FONT_WEIGHT_NORMAL)
        ctx.set_font_size(20)
        ctx.move_to(10, 20)
        ctx.show_text("Text...")

win = MyWindow()
win.connect('delete-event', Gtk.main_quit)
win.show_all()
Gtk.main()

在我身上，一切都完美地在Python 2.7，但仅需​​要为Python3更改Python，并且不再绘制文本。
可能有问题吗？

At me everything perfectly works at Python 2.7, but only it is necessary to change Python for Python3 and the text isn't drawn any more. In what there can be a problem?

推荐答案

遇到同样的问题……原来你会得到

Had the same problem... turns out you'll get no complaints if you're missing a few packages.

尝试apt-get install python3-gi-cairo并再次尝试。为我工作（包括您的代码）。

try apt-get install python3-gi-cairo and give it another try. Worked for me (including your code).

这篇关于开罗示例适用于Python 2.7，但不适用于Python 3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！