fglpixelzoom.html

来自「计算机图形学～想必是很多人需要的～在此共享一下」· HTML 代码 · 共 59 行

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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>fglPixelZoom</STRONG> - specify the pixel zoom	factors     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fglPixelZoom</STRONG>( REAL*4 <EM>xfactor</EM>,				   REAL*4 <EM>yfactor</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>xfactor</EM>, <EM>yfactor</EM> Specify the x and y zoom factors for	pixel			   write operations.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>fglPixelZoom</STRONG> specifies values	for the	x and y	zoom factors.	  During the execution of <STRONG>fglDrawPixels</STRONG>	or <STRONG>fglCopyPixels</STRONG>, if	  (xr, yr) is the current raster position, and a given element	  is in	the mth	row and	nth column of the pixel	rectangle,	  then pixels whose centers are	in the rectangle with corners	  at		       (xr + n.xfactor,	yr + m.yfactor)		    (xr	+ (n+1).xfactor, yr + (m+1).yfactor)	  are candidates for replacement.  Any pixel whose center lies	  on the bottom	or left	edge of	this rectangular region	is	  also modified.	  Pixel	zoom factors are not limited to	positive values.	  Negative zoom	factors	reflect	the resulting image about the	  current raster position.     <STRONG>ERRORS</STRONG>	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>fglPixelZoom</STRONG> is	  executed between the execution of <STRONG>fglBegin</STRONG> and the	  corresponding	execution of <STRONG>fglEnd</STRONG>.     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>	  <STRONG>fglGet</STRONG> with argument <STRONG>GL_ZOOM_X</STRONG>	  <STRONG>fglGet</STRONG> with argument <STRONG>GL_ZOOM_Y</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>fglCopyPixels</STRONG>, <STRONG>fglDrawPixels</STRONG></PRE></BODY></HTML>

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