Winpixget - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Windows

WinPixGet

Declaration: WORD WinPixGet (WINDOW * w , WIN_COORDS x0 , WIN_COORDS y0 )
Category(ies): Windows
Description: Return the status of a pixel in a window: 0 or 1.
Inputs: w
x0, y0 — WINDOW coordinates of pixel to test.
Outputs: 1 if the selected pixel is on or 0 if it is off (or outside the window).
Assumptions: Returns 0 if the given coordinates are outside the window.
Side Effects: None
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: WinAttr, WinPixSet
Example:
/* The ptTest and pxlTest functions use WinPixGet to determine if a particular pixel
is turned on in the graph screen as shown in the following piece of code. */
if (WinPixGet(gr_active->grwinp, ix, iy))
Val = TRUE_TAG;
else
Val = FALSE_TAG;
TI-89 / TI-92 Plus Developer Guide
— WINDOW struct of a previously opened window.
Not for Distribution
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Beta Version January 26, 2001