[49G+] C and SysRPL combined (HPGCC)

Hi.

I'm working on a plotter app for the HP49G+. I need to evaluate
functions using the emulator, so each point to be plotted is calculated
in a SysRPL program.

I'd like the plotter app to be grayscale if possible, and for that I
need to use HPGCC - as I understand it, that's the only way to make
grayscale graphics on the 49G+, right?

The problem is this;

Let's say I want to plot 5 different curves each made up of 131 points
- I now call my SysRPL program to put these 655 reals on the stack,
then call a C-program to display and connect those grayscale-style.
When the C-program ends and return control to the emulator (because I
want to calculate more points - the graph window may have moved etc.),
will the grayscale graphics disappear? I expect it to, as the emulator
will probably refresh the display.

Is there any way to make the emulator *not* refresh the display after
resuming control, or only refresh part of the display - I may want my
SysRPL point calculator display progress status at the top of the
screen, as some graphs take a long time to calculate.

I could also start on a math/parser lib to avoid the SysRPL part
altogether (except for setup informs etc.).

Regards
Steen
.

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