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此应用程序中的简单曲线仅在将其拖出屏幕或调整窗口大小时才会出现。当应用程序刚启动时它不会出现,当窗口最大化或最小化时它也会消失。但是,所有这些时间都打印了“Path Drawn”,因此调用了所有的绘制函数。关于在图形上下文上创建和绘图,我做错了什么吗?如果没有,在这些特殊情况下如何使窗口完全刷新?

import wx

class Path(object):
    def paint(self,gc):
        print "Path Drawn"
        gc.SetPen(wx.Pen("#000000",1))
        path=gc.CreatePath()
        path.MoveToPoint(wx.Point2D(10,10))
        path.AddCurveToPoint(wx.Point2D(10,50),
                             wx.Point2D(10,150),
                             wx.Point2D(100,100))
        gc.DrawPath(path)


class TestPane(wx.Panel):
    def __init__(self,parent=None,id=-1):
        wx.Panel.__init__(self,parent,id,style=wx.TAB_TRAVERSAL)
        self.SetBackgroundColour("#FFFFFF")
        self.Bind(wx.EVT_PAINT,self.onPaint)
        self.SetDoubleBuffered(True)
        self.path=Path()

    def onPaint(self, event):
        event.Skip()

        dc=wx.PaintDC(self)
        dc.BeginDrawing()
        gc = wx.GraphicsContext.Create(dc)

        gc.PushState()
        self.path.paint(gc)
        gc.PopState()
        dc.EndDrawing()

    def drawTestRects(self,dc):
        dc.SetBrush(wx.Brush("#000000",style=wx.SOLID))
        dc.DrawRectangle(50,50,50,50)
        dc.DrawRectangle(100,100,100,100)

class TestFrame(wx.Frame):
    def __init__(self, parent, title):
        wx.Frame.__init__(self, parent, title=title, size=(640,480))
        self.mainPanel=TestPane(self,-1)

        self.Show(True)


app = wx.App(False)
frame = TestFrame(None,"Test App")
app.MainLoop()
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1 回答 1

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注释掉该self.SetDoubleBuffered(True)部分,它将起作用,因为如果一起使用 SetDoubleBuffered 和 GraphicsContext ,由于错误http://trac.wxwidgets.org/ticket/11138窗口不会正确刷新。

If you MUST need double buffering implement it yourselves e.g. first draw to a MeomryDC and then blit or paint bitmap to paint dc.

于 2010-02-28T09:47:02.847 回答