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DirectX from GDI+
Hello
I'm making an application in which I want to display some waveforms. I know how to do this in GDI+, but thought that because sometimes the GDI+ is slow and because I need to display the waves in realtime, I should use managed DirectX. I don't need to use fancy 3D graphics just 2D with a bit of zoom in and zoom out.
So I've started out drawing my grid. The grid will be an outline of the window with 10 horizontal and vertical lines intersecting the window.
DirectX doesn't make it easy drawing lines and such. I miss the ease of the DrawLine method of the GDI+.
Anyway to draw the grid I'm using a VertexBuffer and some CustomVertex objects in which i define my grid points.Then I use DrawPrimitives i.e PrimitiveType.LineStrip to draw the outline of my grid.
After all that I got a rectangle drawn and some lines intersecting it along the horizontal and vertical.
But how do I change the line thickness? Is there an easier way to go about this? Any suggestions on the overall implementation using DirectX and some general advise on how to go about it.
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by: davebytesPosted on 2005-07-01 at 22:01:13ID: 14352777
Hmmm... it's been a while since I've tried to do something at the level you describe. And DX9 changes things a bit.
I believe DX doesn't support varying line thicknesses (but I don't use lines ever). If you want real control, you can implement lines using stretched quads to have complete control.
Alternate approaches:
It used to be you could create a texture surface and get a GDI DC to the surface, use GDI calls, unlock/release the DC, and then render the texture to the 3D scene. I'd have to dig deeper into DX9 to see if that's all still available.
If not, at the least you could still use GDI with a compatible pixel format, and lock a texture and memcpy the pixels into the texture.
-d