wxPython - 没有绘画事件的绘图 [英] wxPython - drawing without paint event
问题描述
我有一个wxPython程序，无论是否发生绘制事件，都需要定期在
上绘制DC。我知道如何使用
让ClientDC进行绘图，我知道绘图调用
make。但是我该怎么做呢？在我调用MainLoop之后，除非有事件，否则我的代码都不会被调用。没有事件，
所以我的代码没有被调用。我该怎么办？
8月9日晚上7:46，Matt Bitten< mbitte ... @ yahoo。 comwrote：
我有一个wxPython程序，需要在定期的
上对DC进行绘图...没有事件，
所以我的代码没有被调用。我该怎么办？
然后事件是：定期，即时间的流逝。
你可以使用wx.Timer定期创建活动，你的代码可以回复：
-------
import wx
class MyFrame（wx.Frame）：
def __init __（self）：
wx.Frame .__ init __（self ，无，-1，我的窗口）
panel = wx.Panel（self，-1）
self.text = wx.StaticText （panel，-1，" hello"，pos =（40,40））
self.timer = wx.Timer（self）
self .Bind（wx.EVT_TIMER，self.on_timer_event）
self.timer.Start（毫秒= 1000，oneShot = False）
def on_timer_event（self，事件）：
if self.text.GetLabel（）==" hello"：
self.text.SetLabel（" goodbye"）
else：
self.text.SetLabel（" hello"）
app = wx.App（redirect = False）
win = MyFrame（ ）
win.Show（）
app.MainLoop（）
----------- -----
确保将计时器保存在自己的位置，以便对对象有永久的
引用，否则计时器将被销毁当
__init_返回时。
8月10日凌晨1点40分，7stud< bbxx789_0 .. 。@ yahoo.comwrote：
8月9日晚上7:46，Matt Bitten< mbitte ... @ yahoo.comwrote：
我有一个wxPython程序，需要在定期的
上对DC进行绘图....而且没有事件，
所以我的代码没有被调用。我该怎么办？
然后事件是：定期，即时间的推移。
你可以使用wx.Timer定期创建活动，
您的代码可以回复：
...
谢谢！
在一个相关的主题上，看起来好像做*全部*绘图
回复油漆事件。当我从计时器中得到一个事件时，我会告诉wx窗口的一部分需要重绘，并依赖它
给我一个画画，即使什么都没有更高优先级需要
完成。
我已经看到了其他GUI内容中推荐的这种逻辑。在wxPython中它是一个好主意吗？如果是的话，怎么做呢？
gl ************ @ gmail.com 写道：
< blockquote class =post_quotes>
在一个相关的主题上，似乎很高兴做* all *
绘图
回应绘制事件。当我从计时器中获得一个事件时，我会告诉wx窗口的一部分需要重绘，并且
依靠它来给我一个画画，即使什么都没有需要优先考虑
优先级。
我已经在其他GUI浏览器中看到过这种逻辑推荐。
在wxPython中是一个好主意，如果是这样，那怎么做呢？
至少不需要 - 在装置事件内外都有设备上下文使用
。
一个很好的策略来自wxPython in Action中的一个例子。是
以下：
*框架具有绘制到BufferedDC的Draw方法，这是
链接到位图会员
*在paint方法中，位图成员被绘制到屏幕上
问候，
Bj？
-
BOFH借口＃393：
来自范艾伦腰带的干扰。
I''ve got a wxPython program that needs to do some drawing on a DC on a
regular basis, whether or not a paint event happens. I know how to
make a ClientDC to do the drawing in, and I know what drawing calls to
make. But how do I make it all happen? After I call MainLoop, none of
my code gets called unless there is an event. And there is no event,
so my code doesn''t get called. What do I do?
On Aug 9, 7:46 pm, Matt Bitten <mbitte...@yahoo.comwrote:I''ve got a wxPython program that needs to do some drawing on a DC on a
regular basis.... And there is no event,
so my code doesn''t get called. What do I do?Then the event is: "on a regular basis", i.e. the passage of time.
You can use a wx.Timer to create events at regular intervals, which
your code can respond to:
-------
import wx
class MyFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, -1, "My Window")
panel = wx.Panel(self, -1)
self.text = wx.StaticText(panel, -1, "hello", pos=(40, 40) )
self.timer = wx.Timer(self)
self.Bind(wx.EVT_TIMER, self.on_timer_event)
self.timer.Start(milliseconds=1000, oneShot=False)
def on_timer_event(self, event):
if self.text.GetLabel() == "hello":
self.text.SetLabel("goodbye")
else:
self.text.SetLabel("hello")
app = wx.App(redirect=False)
win = MyFrame()
win.Show()
app.MainLoop()
----------------
Make sure you save the timer in self so that you have a permanent
reference to the object, otherwise the timer will be destroyed when
__init_ returns.
On Aug 10, 1:40 am, 7stud <bbxx789_0...@yahoo.comwrote:On Aug 9, 7:46 pm, Matt Bitten <mbitte...@yahoo.comwrote:
I''ve got a wxPython program that needs to do some drawing on a DC on a
regular basis.... And there is no event,
so my code doesn''t get called. What do I do?
Then the event is: "on a regular basis", i.e. the passage of time.
You can use a wx.Timer to create events at regular intervals, which
your code can respond to:
...Thanks!
On a related topic, it seems like it would be nice to do *all* drawing
in
response to paint events. When I get an event from the timer, I would
just tell wx that part of the window needs redrawing, and depend on it
to give me a paint even when nothing of higher priority needs to be
done.
I''ve seen this kind of logic recommended in other GUI tookits. Is it a
good idea in wxPython, and, if so, how does one do it?
gl************@gmail.com wrote:
On a related topic, it seems like it would be nice to do *all*
drawing in
response to paint events. When I get an event from the timer, I
would just tell wx that part of the window needs redrawing, and
depend on it to give me a paint even when nothing of higher
priority needs to be done.
I''ve seen this kind of logic recommended in other GUI tookits. Is
it a good idea in wxPython, and, if so, how does one do it?At least it is not required -- there are device contexts for use
inside and outside of paint events.
One nice strategy from an example in "wxPython in Action" is the
following:
* the frame has Draw methods that draw into a BufferedDC, which is
chained to a bitmap member
* inside the paint method, the bitmap member is drawn to screen
Regards,
Bj?rn
--
BOFH excuse #393:
Interference from the Van Allen Belt.
这篇关于wxPython - 没有绘画事件的绘图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！
