Texas Instruments TI-89 Developer's Manual page 1282

1240
gr_active, gr_other
Inputs: None
Outputs: None
Assumptions: Access_AMS_Global_Variables is defined.
Side Effects: None
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: None
Example:
/* Given a floating point independent value and a pointer to its graph Window
variables min, max, and step values, ICvtFtoP returns the corresponding increment
or 0xFFFF if the independent value is out of range.
*/
WORD ICvtFtoP( BCD16 f, BCD16 *indep_rng )
{ Access_AMS_Global_Variables;
WORD NewInc;
switch (gr_active->graph_mode) {
case GR_FUNC:
return( (WORD) XCvtFtoP(f, gr_active) );
case GR_DE:
case GR_SEQ:
case GR_PAR:
case GR_POL:
if (gr_CptIndepInc(f, indep_rng, &NewInc))
return( NewInc );
case GR_3D:
return ((f - gr_active->rngp[GR_XMIN]) * (gr_active->rngp[GR_XGRID] /
(gr_active->rngp[GR_XMAX] - gr_active->rngp[GR_XMIN])));
}
return 0xFFFF;
}
TI-89 / TI-92 Plus Developer Guide
Appendix B: Global Variables — Graphing
(continued)
Not for Distribution Beta Version January 26, 2001