--- In "Mike Lehmann" <> wrote:
>
> I have to display real-time graphs on my TS-7300. What would you guys
> suggest as far as graphing this goes? It will print one graph, wipe it and
> then print another in it's place. Is QT the best bet for this? Also, how
> tough do you think it would be to install QWT onto my 7300?
> Thanks.
>
Hi Mike,
I haven't used QT in my application, I simply wrote direct to the frame buffer.
A few questions:
* What is the board doing other than displaying the graphs?
* How many graphs per second do you want to display?
* What other items (text, etc) will be displayed?
My application displays process data graphs (48 lines with 128 points per
line), and trend displays (8 lines with 256 points), with axis labels etc. The
full screen display takes around 30ms to draw, using a double buffered screen
arrangement.
If you want a scrolling trend type display you could bitblt the part of the old
graph onto the new graph and then draw the new data on the end. and add the new
axis labels.
A simple font bitmap stored in a spare screen would provide the font image (I
used a program called BMFont from AngleCode.com to generate the bitmaps), and
there are any number of line algorithms - I have both anti-aliased and non
anti-aliased routines depending on whether I want to optimize speed or
appearance.
I'll add a couple of my typical graph screens to the photos (misc) section for
you to see.
Hope this helps,
PJE
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