https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=84PCSE%3ABCALLs%3A55BA 2026-06-01T18:13:31Z Revision history for this page on the wiki MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=84PCSE:BCALLs:55BA&diff=10178&oldid=prev 2013-10-20T02:55:39Z

<p>IVertLine</p> <p><b>New page</b></p><div>[[Category:84PCSE:BCALLs:By Name|IVertLine]] [[Category:84PCSE:BCALLs:By Name:Drawing|IVertLine]] [[Category:84PCSE:BCALLs:By Address|55BA - IVertLine]]<br /> == Synopsis ==<br /> '''Unofficial Name:''' IVertLine<br /> <br /> '''BCALL Address:''' 55BAh<br /> <br /> Draw a vertical line.<br /> <br /> === Inputs ===<br /> * DE = X coordinate of line<br /> * B = Y coordinate of bottom end of line (from bottom of screen)<br /> * C = Y coordinate of top end of line; must be greater than or equal to B<br /> * A = 1 to use the current foreground color, or 4 to copy pixels from the graph buffer<br /> * ([[84PCSE:RAM:A038|penFGColor]]) = RGB color to draw (if A = 1)<br /> * ([[84PCSE:RAM:A03A|penFGColorIndex]]) = Color index to store in graph buffer (if A = 1)<br /> * [[84PCSE:Flags:2B#Bit_2|fullScrnDraw, (iy + apiFlg4)]] = 1 to use LCD coordinates; 0 to use graph coordinates<br /> * [[84PCSE:Flags:02#Bit_1|plotLoc, (iy + plotFlags)]] = 1 to draw to LCD only; 0 to draw to LCD and graph buffer<br /> <br /> === Outputs ===<br /> ''None''<br /> <br /> === Destroys ===<br /> * Interrupts disabled<br /> <br /> == Comments ==<br /> This routine is analogous to calling [[84PCSE:BCALLs:47CE|IPoint]] several times for a vertical row of pixels, but somewhat faster. Like IPoint, A may either be 1 (to draw with the current foreground color), or 4 (to copy pixels from the graph buffer to the LCD.) The other IPoint operations are not supported.<br /> <br /> Unlike IPoint, this routine does not check that the input coordinates are valid (i.e., within the bounds of the LCD or graph buffer); passing invalid coordinates may have strange effects.</div>

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