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How Do You Draw A Line With Direct Draw?

Posted on 2002-06-13
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Last Modified: 2013-12-08
Is there a Direct Draw or DirectX function to allow you to draw a line on the back buffer?  I couldn’t find one so I’m currently using the LineTo() GDI function to draw straight on the screen.  If there isn’t a function available can you use LineTo() to draw on the back buffer?  If not is there another way of doing it.

Thanks a lot for your help
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Question by:Plague1392
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by:thresher_shark
ID: 7082068
What version of directX are you using and what language?
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by:Plague1392
ID: 7082080
Ooops, Sorry about that.  I'm using C and DirectX 8, but the book I'm reading is actually based on version 6 so a lot of what I'm using is probably more version 6.  I've been using the latest version of the DirectX data types though, e.g. LPDIRECTDRAW7, LPDIRECTDRAWSURFACE7 etc.  
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by:jdrescher
ID: 7090185
I draw my lines and other curves by using algorithms and plotting individual pixels.

Jonn
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mh2 earned 100 total points
ID: 7092458
Hi,

I have not worked with DirectX since 7, but I know in these versions there were no routines for plotting primitives like lines or circles, DirectDraw was basically a bitmap blitter.

I rarely need to draw lines, but I know of only 2 ways:
1. Use GDI like you are now
2. Lock the surface and use an algorithm such as Bresenhams to plot you pixels into your surface buffer.

As far as I know, DX 8 has know combined DirectDraw and Direct3D, so you may be able to draw lines using the 3D pimitives linking vertexts ( like a one-line wireframe ). This would probably mean requiring some form of 3D hardware, way overkill if your app does not require this ( the increased compatibility problems and raised hardware requirments will not be worth the develpment time saved ).

Thankx,
Mark
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Author Comment

by:Plague1392
ID: 7095377
Thanks for the help and for naming an algorithm.  I'd been searching for an appropriate algorithm but couldn't find one.
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