When I use wx.RegionFromBitmap to create a region from a transparent bitmap, and then call wx.Frame.SetShape to set the region as the frame’s shape, even the transparent part of the bitmap is not transparent in the frame. What’s the matter? Is anything wrong?
PS: I know we could use wx.RegionFromBitmapColour could meet my need. However, I want to know why we can’t use wx.RegionFromBitmap and a transparent picture to produce the same effect.
Dae James
Does the image have an alpha channel instead of a mask? For PNG type image files, for example, if any pixel's transparency value is something other than 0 or 255 then it will be loaded in to wx with an alpha channel. If all are either 0 or 255 then it will be loaded as a mask instead. wx.RegionFromBitmap can only use a mask. You can use wx.Image.ConvertAlphaToMask to force it to be a mask if needed
On 10/14/12 4:21 AM, Dae James wrote:
When I use wx.RegionFromBitmap to create a region from a transparent
bitmap, and then call wx.Frame.SetShape to set the region as the frame's
shape, even the transparent part of the bitmap is not transparent in the
frame. What's the matter? Is anything wrong?
PS: I know we could use wx.RegionFromBitmapColour could meet my need.
However, I want to know why we can't use wx.RegionFromBitmap and a
transparent picture to produce the same effect.
--
Robin Dunn
Software Craftsman
What if I want some parts of the region to be translucent, other parts opacity?
Dae James
From: Robin Dunn
Date: 2012-10-17 07:28
To: wxpython-users
Subject: Re: [wxPython-users] Question about transparent region as the shape of the frame
On 10/14/12 4:21 AM, Dae James wrote:
When I use wx.RegionFromBitmap to create a region from a transparent
bitmap, and then call wx.Frame.SetShape to set the region as the frame’s
shape, even the transparent part of the bitmap is not transparent in the
frame. What’s the matter? Is anything wrong?
PS: I know we could use wx.RegionFromBitmapColour could meet my need.
However, I want to know why we can’t use wx.RegionFromBitmap and a
transparent picture to produce the same effect.
Does the image have an alpha channel instead of a mask? For PNG type
image files, for example, if any pixel’s transparency value is something
other than 0 or 255 then it will be loaded in to wx with an alpha
channel. If all are either 0 or 255 then it will be loaded as a mask
instead. wx.RegionFromBitmap can only use a mask. You can use
wx.Image.ConvertAlphaToMask to force it to be a mask if needed
–
Robin Dunn
Software Craftsman
–
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That can't currently be done by setting the frame shape. It's only an all or nothing transparency.
On 10/16/12 11:14 PM, Dae James wrote:
What if I want some parts of the region to be translucent, other parts
opacity?
--
Robin Dunn
Software Craftsman