Plotting a pixel.

Hi, i am writing a relativley simple game and i am hoping to expand soon into graphics, i will be posting the source shortly (once i get back from school - lol) but was wondering if anyone could provide some code to plot a single pixel on the screen as i have trawled countless websites and tutorials to no avail. :confused:

Well, you need to be specific about which OS and compiler you'll be using, then perhaps we can advise you on choosing a graphical API to go along with it.

Hokay, soz about that - bloodshed dev c++ - win 98 se , (i also run red hat 7.2 but 98 is the os i code on)

Check out these tutorials...

Here

Though this was probably better to be posted in the Windows programming forum on cboard, but check the tutorials first...

Thanks anyway but ive found a tutorial that suits me just fine - thanks again for the help. i shall return if more is needed :)

Although I am having some windows compiler issues right now.. here is some code which I think will compile and run.

Code:

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#include<windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);       

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{

        WNDCLASS WndClass;
        WndClass.style = 0;
        WndClass.cbClsExtra = 0;
        WndClass.cbWndExtra = 0;
        WndClass.lpfnWndProc = WndProc;
        WndClass.hInstance = hInstance;
        WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
        WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
        WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
        WndClass.lpszMenuName = 0;
        WndClass.lpszClassName = "Pixel Fun";

        RegisterClass(&WndClass);

        HWND hWindow;

        hWindow = CreateWindow("Pixel Fun","Window",WS_OVERLAPPEDWINDOW,0,0,600,460,NULL,NULL,hInstance,NULL);

        UpdateWindow(hWindow);

        MSG Message;
       
        while(GetMessage(&Message,NULL,0,0))

                DispatchMessage(&Message);

        return(Message.wParam);

}

LRESULT CALLBACK WndProc (HWND hWnd, UINT uiMessage, WPARAM wParam, LPARAM lParam)
{
        static BYTE Pixel[6][5] = {0,255,0,255,0,0,
                                255,0,255,0,255,0,
                                0,255,0,255,0,0,
                                255,0,255,0,255,0,
                                0,255,0,255,0,0 };

        static HBITMAP hBitmap;
        static HDC hdcmem;

        switch(uiMessage)
        {

        case WM_LBUTTONDOWN:
                       
                        HDC hdc;
                        hdc = GetDC(hWnd);

                        hdcmem  = CreateCompatibleDC(hdc);
                        hBitmap = CreateBitmap(6,5,1,8,Pixel);
                        SelectObject(hdcmem, hBitmap);

                        RECT rect;
                        GetClientRect(hWnd, &rect);
                        int x,y;
                       
                        for(y=0;y<rect.bottom;y+=5)
                                for(x=0;x<rect.right;x+=5)

                                        BitBlt(hdc,x,y,5,5,hdcmem,0,0,SRCCOPY);

                        DeleteObject(hBitmap);
                        DeleteDC(hdcmem);

                        ReleaseDC(hWnd, hdc);
                        return 0;

        case WM_RBUTTONDOWN:

                        hdc = GetDC(hWnd);
                        hdcmem = CreateCompatibleDC(hdc);
                        hBitmap = CreateBitmap(5,5,1,8,Pixel);
                        SelectObject(hdcmem, hBitmap);

                        GetClientRect(hWnd, &rect);

                       
                        for(y=0;y<rect.bottom;y+=10)
                                for(x=0;x<rect.right;x+=10)

                                        StretchBlt(hdc,x,y,10,10,hdcmem,0,0,5,5,SRCCOPY);

                        DeleteObject(hBitmap);
                        DeleteDC(hdcmem);
                        ReleaseDC(hWnd, hdc);
                        return 0;

        case WM_DESTROY:

                        PostQuitMessage(0);
                        return 0;

        default:

                        return DefWindowProc(hWnd, uiMessage, wParam, lParam);

        }

}

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