Transparent PNG
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From: Peter Carlson on 16 Jan 2010 22:38 I have searched all the articles and tried various things, but cant seem to get this to work. CF 3.5 targetting Winmo 6+. I have a png in a picturebox. Then I have another png that is transparent. the background is a compass frame and the foreground is the compass rose. I update the image like this: Bitmap b2 = Properties.Resources.pngRose; Graphics gpCompass = Graphics.FromImage(pbCompass.Image); gpCompass.DrawImage(b2, 0, 0, new Rectangle(0, 0, b2.Width, b2.Height), GraphicsUnit.Pixel ); pbCompass.Refresh(); However it draws the rose with a solid white background. So I thought maybe I need to load the png from a file, but I am not sure how to do this in the emulator? So 2 questions: 1. can this be done by embedding the resource? 2. Where do I place the png in the file system of the project in order to get it onto the emulator? Peter
From: Markus Humm on 17 Jan 2010 07:44 Hello, has the PNG a alpha channel? Greetings Markus
From: Peter Carlson on 17 Jan 2010 11:32 Yes, I drew it in photoshop and it shows there as transparent as well in IE and windows photo viewer. It is 32bpp Peter Markus Humm wrote: > Hello, > > has the PNG a alpha channel? > > Greetings > > Markus
From: badzio on 17 Jan 2010 11:52 On 17 Sty, 04:38, Peter Carlson <peter(a)h_o_w_u_d_o_d_a_t.com> wrote: > I have searched all the articles and tried various things, but cant seem > to get this to work. CF 3.5 targetting Winmo 6+. I have a png in a > picturebox. Then I have another png that is transparent. the > background is a compass frame and the foreground is the compass rose. Hi, not sure how it works in CF 3.5. But in CF 2.0 transparent means that background is taken from parent control. You can implement transparency yourself or use some library :) I've found alphamobilecontrols, it's on LGPL and works fine. But it's for CF 2.0, you must check if it works on CF 3.5
From: Matt Evans on 18 Jan 2010 19:45
Hi Peter if I recall correctly, the problem you are seeing is because the .net cf bitmap loaders don't respect the alpha channel. If you are using WM5.0 or above you can use the GDI+ and the imaging library api to load your png files with transparency. Take a look at this blog post: http://blog.opennetcf.com/afeinman/PermaLink,guid,e59ee005-91b0-4807-8142-22394b368826.aspx The OpenNETCF SDF has managed wrappers for the imaging api, and I have used that to successfully load my transparent png files from the file system and then draw them to controls. HTH Matt On Jan 17, 2:38 pm, Peter Carlson <peter(a)h_o_w_u_d_o_d_a_t.com> wrote: > I have searched all the articles and tried various things, but cant seem > to get this to work. CF 3.5 targetting Winmo 6+. I have a png in a > picturebox. Then I have another png that is transparent. the > background is a compass frame and the foreground is the compass rose. I > update the image like this: > > Bitmap b2 = Properties.Resources.pngRose; > Graphics gpCompass = Graphics.FromImage(pbCompass.Image); > gpCompass.DrawImage(b2, 0, 0, > new Rectangle(0, 0, b2.Width, b2.Height), > GraphicsUnit.Pixel ); > pbCompass.Refresh(); > > However it draws the rose with a solid white background. > > So I thought maybe I need to load the png from a file, but I am not sure > how to do this in the emulator? > > So 2 questions: > 1. can this be done by embedding the resource? > 2. Where do I place the png in the file system of the project in order > to get it onto the emulator? > > Peter |