wxPython

Question

我需要在普通图片上显示透明的 .png 图像。我试过 this 方法，但是 wxPython 说

wxPaintDC can't be created outside wxEVT_PAINT handler

我找不到解决方法。我将 wx.EVT_PAINT 绑定到某个函数并尝试了那里的代码，但没有成功。这是我的代码：

import wx

class Test(wx.Frame):
    def __init__(self, parent):
        super().__init__(parent)

        self.SetTitle('Testing transparency')
        self.baseImage = wx.StaticBitmap(self, wx.ID_ANY)

        self.DrawBaseImage()
        self.DrawOnTop()

    def DrawBaseImage(self):
        bitmap = wx.Bitmap('path', wx.BITMAP_TYPE_ANY)
        image = wx.Bitmap.ConvertToImage(bitmap)
        self.baseImage.SetBitmap(image.ConvertToBitmap())

    def DrawOnTop(self):
        bmp = wx.StaticBitmap(self.baseImage, wx.ID_ANY)

        bitmap = wx.Bitmap('path_of_transparent_image', wx.BITMAP_TYPE_PNG)
        image = wx.Bitmap.ConvertToImage(bitmap)
        bmp.SetBitmap(image.ConvertToBitmap())


app = wx.App()
Test(None).Show()
app.MainLoop()

谢谢！

Answer 1

找到解决方案。只需要以正确的方式使用 wx.EVT_PAINT！

import wx

class Test(wx.Panel):
    def __init__(self, parent):
        super().__init__(parent)

        self.base = wx.Bitmap('base', wx.BITMAP_TYPE_ANY)
        self.png = wx.Bitmap('transparent_image', wx.BITMAP_TYPE_PNG)

        self.Bind(wx.EVT_PAINT, self.OnPaint)

    def OnPaint(self, e):
        dc = wx.PaintDC(self)
        dc.SetBackground(wx.Brush("WHITE"))

        dc.DrawBitmap(self.base, 0, 0, True)
        dc.DrawBitmap(self.png, 0, 0, True)


class Frame(wx.Frame):
    def __init__(self, parent):
        super().__init__(parent)
        Test(self).Show()

app = wx.App()
Frame(None).Show()
app.MainLoop()

wxPython - 将透明的 PNG 图像放在另一个图像之上

wxPython - Putting a transparent PNG image on top of another

image

transparency