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Appendix A: System Routines — Graphing
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
CptFuncX
Declaration:
BCD16
CptFuncX
(BCD16
incs
, GR_WIN_VARS *
ptr
)
Category(ies):
Graphing
Description:
Add the given number of
∆
x increments (
incs
) to the original xmin of the
specified graph viewing window. The current xmin will be different from the
original xmin only if panning has occurred in function mode.
CptFuncX
is
the same as
XCvtPtoF
, except that increment 0 always corresponds to the
original xmin, which may not be column 0 after panning.
Inputs:
incs
— Number of
∆
x increments to the left (negative) or right (positive)
of original xmin. Increment 0 always corresponds to the original
xmin, before any panning that may have occurred.
ptr
— Pointer to the GR_WIN_VARS struct to use for viewing window
values (
gr_active
for the active graph window,
gr_other
for the
second graph in two graph mode).
Outputs:
Returns the x coordinate obtained by computing original xmin+
∆
x*
incs
in
BCD16 floating point format, rounded to 12 digits.
Assumptions:
Assumes an x, y coordinate system, even in 3D mode.
Side Effects:
None
Availability:
All versions of the TI-89 / TI-92 Plus.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: XCvtPtoF
Example:
for( inc = -10; inc <= 10; ++inc )
{ /* generate table of x values before and after xmin */
/* compute BCD x value corresponding to next increment */
x = CptFuncX( inc, gr_active );
.
.
.
}
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