Appendix A: System Routines — Graphing
609
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
GrLineFlt
Declaration:
void
GrLineFlt
(BCD16
x1
, BCD16
y1
, BCD16
x2
, BCD16
y2
,
GR_WIN_VARS *
grPtr
, SWORD
pixcur
[ ], BYTE
funcAttr
, BYTE
pattern
)
Category(ies):
Graphing
Description:
Draw a line on the current graph based on the associated viewing window
variables as defined by
grPtr
.
Inputs:
x1, y1
— First end-point of line to draw.
x2, y2
— Second end-point.
grPtr
— Graph window structure (
gr_active
,
gr_other
) defining the
window to draw to and the viewing window variables.
pixcur
— An array of 2 SWORDs.
funcAttr
— Attribute to use to draw the line: FA_LINE, FA_DOT,
FA_THICK, FA_ANIMATE, FA_PATH, FA_ABOVE,
FA_BELOW, FA_SQUARE.
pattern
— If
funcAttr
is FA_ABOVE or FA_BELOW then
pattern
specifies the shade pattern: A_SHADE_V, A_SHADE_H,
A_SHADE_NS, A_SHADE_PS. Shading will not occur unless
gr_flags.gr_in_progress
is set.
Outputs:
pixcur
— The pixel values of the 2nd end-point ([0] will be -1 if no plot).
Assumptions:
The graph is active and not 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: GrClipLine
(which this routine calls),
GraphActivate
Example:
If the graph is active (see
GraphActivate
) the DrawFBox routine shown
below will draw a box on the graph screen with opposite corners (x0, y0)
and (x1, y1).
void DrawFBox( BCD16 x0, BCD16 y0, BCD16 x1, BCD16 y1 )
{ Access_AMS_Global_Variables;
SWORD pixcur[2];
GrLineFlt( x0, y1, x0, y0, gr_active, pixcur, FA_LINE, 0 );
GrLineFlt( x0, y0, x1, y0, gr_active, pixcur, FA_LINE, 0 );
GrLineFlt( x1, y0, x1, y1, gr_active, pixcur, FA_LINE, 0 );
GrLineFlt( x1, y1, x0, y1, gr_active, pixcur, FA_LINE, 0 );
}
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