Draw pixels with gdi32

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C++

I need help drawing and shading pixels with gdi32 and c++. Can anybody help?

Posted 22-Mar-11 6:54am

Akhilesh Iyengar

Updated 22-Mar-11 6:57am

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mbue 22-Mar-11 13:34pm

Where do you want to paint to? Bitmap or Screen (HDC)? You can paint shaded pixels only if you have the pixel beneath (i.e. to a bitmap).
Regards.

Sandeep Mewara 22-Mar-11 17:26pm

What kind of help you are looking for? Until you share what have you done and where are you stuck, it would be difficult for members to comment.

Richard MacCutchan 22-Mar-11 17:39pm

Try a Google search for "GDI Draw", you will find lots of samples.

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Niklas L · Answer 1 · 2011-03-22T21:03:00

Here's a thought

C++

#define RGB_GETBLUE(rgb)  (((rgb) >> 16) & 0xff)
#define RGB_GETGREEN(rgb) (((rgb) >> 8) & 0xff)
#define RGB_GETRED(rgb)   ((rgb) & 0xff)

COLORREF pix = ::GetPixel(hDC, x, y);

int red   = RGB_GETRED(pix);
int green = RGB_GETGREEN(pix);
int blue  = RGB_GETBLUE(pix);

float shadowEffect = 0.5f;

red   = static_cast<int>(red * shadowEffect);
green = static_cast<int>(green * shadowEffect);
blue  = static_cast<int>(blue * shadowEffect);

::SetPixel(hDC, x, y, RGB(red, green, blue));