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Print2DExpr |
Function (ROM Call 0x4C) |
Performs "pretty printing" (or "2D printing") of an expression.
Print2DExpr prints the expression in "pretty" or "2D" style. Before printing, the expression
needs first to be "parsed" using Parse2DExpr, and argument ptr
should be a result returned from Parse2DExpr
(an error may be thrown if ptr points to something else). w is a pointer
to the WINDOW structure which describes the window in which
the expression will be displayed (see wingraph.h header file for
more info about windows). If you didn't create your own windows in the program, you can pass
DeskTop as the parameter (as in the example given below).
x and y are coordinates (window-relative) where the expression will be printed.
x determines the left edge of the expression, and the expression goes (in y direction)
both above and below the value of y. See Parms2D for exact
information about dimensions of displayed expression. If the displayed expression can not fit
into the given window, it will be simply clipped at edges of the window.
Here is an example (called "Pretty Print") which first calculates the integral of 1/((x-3)(x^2+4)), then "pretty prints"
the result on the screen:
// Calculate an integral and pretty print it
#define USE_TI89 // Compile for TI-89
#define USE_TI92PLUS // Compile for TI-92 Plus
#define USE_V200 // Compile for V200
#define MIN_AMS 101 // Compile for AMS 1.01 or higher
#define SAVE_SCREEN // Save/Restore LCD Contents
#include <tigcclib.h> // Include All Header Files
// Main Function
void _main(void)
{
TRY
push_END_TAG ();
push_quantum (VAR_X_TAG);
push_parse_text ("1/((x-3)(x^2+4))");
push_quantum (INTEGRATE_TAG);
NG_rationalESI (top_estack);
WinClr (DeskTop);
Print2DExpr (Parse2DExpr (top_estack, FALSE), DeskTop, 0, 50);
ONERR
DrawStr (20, 20, "Error!", A_NORMAL);
ENDTRY
ngetchx ();
}
It is also possible to use
Parse2DExpr (top_estack, FALSE);
Print2DExpr (top_estack, DeskTop, 0, 50);
instead of
Print2DExpr (Parse2DExpr (top_estack, FALSE), DeskTop, 0, 50);
You can use Parms2D to get information about the height and the width
of the printed expression without displaying it on the screen. This may be used to determine
coordinates where the expression needs to be displayed.
Uses: WinFont
Used by: cmd_disp, cmd_output, cmd_pause, HomeExecute