wxPython的 - 调整图像大小与其父面板的EVT_SIZE事件

Question

我以前在问这个问题的尝试是可怕的，我也取得了一些进展，请原谅，我不打算重新问这个了这么多次，这是不是我的风格。

下面是最后的版本：我调整包含DC客户绘位图的窗口，并在EVT_SIZE事件，我对重新缩放它（使用规模，不重新调整），并重新画影像缩放它。问题是，它不会出现，好像在尊重即使我计算瓦特/它小时宽高比。此外，当它生长在高度图像失真。最后，当另一个窗口经过它时，图像变成了白色。任何想法如何解决所有这些问题？我的窗口/图像类低于：

class TransactionImage(wx.Window):
    def __init__(self, parent, fname, name):
        wx.Window.__init__(self, parent, name=name)

        self.dc = wx.ClientDC(self)  

        self.load_image(fname)
        cursor = wx.StockCursor(wx.CURSOR_MAGNIFIER)
        self.SetCursor(cursor)

        self.Bind(wx.EVT_SIZE, self.resize_space)


    def load_image(self, image):
        self.image = wx.Image(image, wx.BITMAP_TYPE_JPEG)
        (w, h) = self.image.GetSize()
        self.image_ar = w/h

    def resize_space(self, size):
        (w, h) = self.get_best_size()
        self.s_image = self.image.Scale(w, h)
        self.bitmap = wx.BitmapFromImage(self.s_image)
        self.dc.DrawBitmap(self.bitmap, 0, 0, useMask=False)
        # how can I 'refresh this area to make it 'fit'

    def get_best_size(self):
        (window_width, window_height) = self.GetSizeTuple()
        new_height = window_width / self.image_ar
        new_size = (window_width, new_height)
        return new_size

此外，我无法理解如何正确使用客户端DC。我想重新绘制下一个图像之前刷新窗口区域，因为如果我不我得到奇怪的risiduals，它看起来不错。为了解决这个问题我尝试使用dc.Clear用于清洁背景关闭。然而，在各种规模的呼叫这样做，因为我需要使图像闪烁白色百万次，而IM RE-大小。我怎样才能避免这种情况？

编辑 -

在回应Umyal的评论回应 - 这是我的应用程序的一个非常简化的版本。对于大小处理图像无论哪种方式，我类我的窗前，发电机重新缩放图像会导致图像闪烁严重，创造了一个不吸引人的神器。此外，当另一帧经过的应用，所述图像显示变成白色，仿佛被擦除。

我想作为解决的办法 - 我可以实现该解决方案的窗口图像浏览器似乎有，这是图像只重新调整和重新粉刷时，用户可以调整大小，当它去框的边缘。与溶液的问题是，存在当用户停止调整大小的帧，以检测没有明确的方法。 （wxEVT_SIZE，wxEVT_SIZING）

下面是简化应用程序的代码，你需要找到自己的图像和越大越好。原始图像dimentions是3872 X 2592

# this is required for 'real' math - derive the 'aspect ratio'
from __future__ import division
import wx

class TransactionImage(wx.Window):
    def __init__(self, parent, fname, name):
        wx.Window.__init__(self, parent, name=name)

        self.load_image(fname)
        cursor = wx.StockCursor(wx.CURSOR_MAGNIFIER)
        self.SetCursor(cursor)

        self.Bind(wx.EVT_SIZE, self.resize_space)
        self.Bind(wx.EVT_PAINT, self.on_paint)

    def load_image(self, image):
        self.image = wx.Image(image, wx.BITMAP_TYPE_JPEG)
        (w, h) = self.image.GetSize()
        self.image_ar = w/h
        self.bitmap = wx.BitmapFromImage(self.image)

    def resize_space(self, event):
        (w, h) = self.get_best_size()
        self.s_image = self.image.Scale(w, h)
        self.bitmap = wx.BitmapFromImage(self.s_image)

    def on_paint(self, event):
        self.dc = wx.PaintDC(self)
        self.dc.DrawBitmap(self.bitmap, 0, 0, useMask=False)

    def get_best_size(self):
        (window_width, window_height) = self.GetSizeTuple()
        new_height = window_width / self.image_ar
        new_size = (window_width, new_height)
        return new_size


class OriginalTransactionImage(wx.Window):
    def __init__(self, parent, fname, name):
        wx.Window.__init__(self, parent, name=name)

        self.dc = wx.ClientDC(self)  

        self.load_image(fname)
        cursor = wx.StockCursor(wx.CURSOR_MAGNIFIER)
        self.SetCursor(cursor)

        self.Bind(wx.EVT_SIZE, self.resize_space)


    def load_image(self, image):
        self.image = wx.Image(image, wx.BITMAP_TYPE_JPEG)
        (w, h) = self.image.GetSize()
        self.image_ar = w/h

    def resize_space(self, size):
        (w, h) = self.get_best_size()
        self.s_image = self.image.Scale(w, h)
        self.bitmap = wx.BitmapFromImage(self.s_image)
        self.dc.DrawBitmap(self.bitmap, 0, 0, useMask=False)

    def get_best_size(self):
        (window_width, window_height) = self.GetSizeTuple()
        new_height = window_width / self.image_ar
        new_size = (window_width, new_height)
        return new_size


class ImageBrowser(wx.Frame):

    def __init__(self, image1, image2, parent=None, id=wx.ID_ANY,
                 pos=wx.DefaultPosition, title='Image Browser'):
        size = (1500, 800)
        wx.Frame.__init__(self, parent, id, title, pos, size)

        self.CentreOnScreen()

        self.panel = wx.Panel(self, wx.ID_ANY)
        self.panel.SetBackgroundColour(wx.Colour(191,197,229))

        self.main_sizer = wx.BoxSizer(wx.VERTICAL)

        self.image_panel = wx.Panel(self.panel, wx.ID_ANY, style=wx.SIMPLE_BORDER)
        self.image_panel.SetBackgroundColour(wx.Colour(255, 255, 255))

        self.image_sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.image_panel.SetSizer(self.image_sizer)

        self.load_image_sizer(image1, image2)
        self.main_sizer.Add(self.image_panel, 1, wx.GROW|wx.ALIGN_CENTER|wx.ALL, 25)
        self.panel.SetSizer(self.main_sizer)


    def load_image_sizer(self, image1, image2):
        #bitmap1 = OriginalTransactionImage(self.image_panel, image1, 'image1')
        #bitmap2 = OriginalTransactionImage(self.image_panel, image2, 'image2')

        bitmap1 = TransactionImage(self.image_panel, image1, 'image1')
        bitmap2 = TransactionImage(self.image_panel, image2, 'image2')

        self.image_sizer.Add(bitmap1, 1, wx.GROW|wx.ALIGN_LEFT|wx.ALL, 20)
        self.image_sizer.Add(bitmap2, 1, wx.GROW|wx.ALIGN_RIGHT|wx.ALL, 20)


class IBApp(wx.App):

    def OnInit(self):
        img1 = "0_3126_image1.jpeg"
        img2 = "0_3126_image2.jpeg"

        ib = ImageBrowser(img1, img2)
        ib.Show()
        self.SetTopWindow(ib)        
        return True

app = IBApp(False, None)
app.MainLoop()

Answer 1

不要在你的窗口实例到客户端DC的引用（的http：//文档。 wxwidgets.org/2.6/wx_wxclientdc.html ），也不是在窗口直流

绘制的适当的方式

而不是绑定到PAINT_EVENT和借鉴那里，下面我已经证明你说添加到您的类

的东西

class TransactionImage(wx.Window):
    def __init__(self, parent, fname, name):

        self.Bind(wx.EVT_SIZE, self.resize_space)
        self.Bind(wx.EVT_PAINT, self.onpaint)

    def onpaint(self):
        dc = wx.PaintDC(self)
        dc.DrawBitmap(self.bitmap, 0, 0, useMask=False)

    def resize_space(self, size):
        (w, h) = self.get_best_size()
        self.s_image = self.image.Scale(w, h)
        self.bitmap = wx.BitmapFromImage(self.s_image)
        self.Refresh()