GDI+ question

[ZejulioZ]

Hi I'm using GDI+ for a C++ application which is a great library. But this library sooo powerfull is not able to do a simple thing I need to do :( I have a picture 1 x 10 px that I want to stretch to a very flat 100 x 10 px. As result I have a wonderful alpha gradient which is not what I want. Of course I tried to change the interpolation mode to InterpolationModeNearestNeighbor which give me a better result but still not perfect since and - I don't why - the area painted is not completly filled. There is the very simple code : // Load in some initialisation function // a 1 x 100 picture sized m_pBitmap1 = Bitmap::FromFile( csFilename.AllocSysString() ); // Then in onpaint method CPaintDC dc(this); Graphics graphics(dc.m_hDC); graphics.SetInterpolationMode( InterpolationModeNearestNeighbor ); graphics.DrawImage(m_pBitmap1, 0, 0, 100, m_pBitmap1->GetHeight()); Can somebody provide me some explainations or even better... a solution ? :) Thanks

[PJ Arends]

Maybe I am missing something, but why not just use the GDI function StretchBlt. It does not do any of the funky gradient stuff you don't want. Use Graphics::GetHDC to get the HDC handle, and then call Graphics::ReleaseHDC when you are done. It is a very simple way to mix GDI and GDI+ in the same drawing routine.

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"You're obviously a superstar." - Christian Graus about me - 12 Feb '03 "Obviously ???  You're definitely a superstar!!!" mYkel - 21 Jun '04 Within you lies the power for good - Use it!

[Chris Richardson]

Actually, if the stretch blt mode is HALFTONE (anti-aliasing), the image will indeed be alpha blended. Very annoying when you don't want it turning your image into a gradient, but do want a bit of smoothing on the edges. Take a look at SetStretchBltMode if you're curious. Chris Richardson

[ZejulioZ]

I haven't tought to mix GDI and GDI+, that's definitely a good idea.. Thank you for the explanations about the anti-aliasing processing. thanks, thanks, thanks :)