🚀 go-pugleaf

Try creating an in memory bitmap the size of the client window.  Write each
element you wish to display on to that bitmap.  When a screen update is
needed you would then only perform one BitBlt, a call which copies that one
bitmap to the screen.

.  Ed

> M. Finch wrote in message
> news:3ff41d43$1@newsgroups.borland.com...
> I am continuing to work on an application that shows the world map, and
> hopefully someday be able to display the active aircraft in the US and
> possibly elsewhere.  My test file only has 160 points, but certainly
someday
> there could be thousands to plot.
>
> In drawing my test file, I have a small bitmap that I've found (120x100)
to
> display.  I've tried Bitblt to dispay the 160 points, but it took a few
> seconds to go through the 160 points in the list to display them.
> Alternatively I've drawn a crude picture using MoveToEx and LineTo which
> took negligible time to draw, but the display is crude at best.
>
> I'm interested in finishing this using API if possible.  But the BitBlt
MUST
> go.  Any ideas on what I can use that would be faster?  I'm aware that it
> would be faster using DirectX or OpenGL, but I'd like to finish this
first.
>
> Here's the code that I'm using to draw the Bitmap.  I work my way through
> the list calling this for each point.
> -------
>   HDC hdcMem = CreateCompatibleDC(NULL);
>   HBITMAP hbmT = SelectBitmap(hdcMem,hbm);
>
>   BITMAP bm;
>   GetObject(hbm,sizeof(bm),&bm);
>
>   BitBlt(hdc,0,0,bm.bmWidth,bm.bmHeight,hdcMem,0,0,SRCCOPY);
> -------