fgledgeflag.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>fglEdgeFlag,</STRONG> <STRONG>fglEdgeFlagv</STRONG> - flag edges as either boundary or	  nonboundary     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fglEdgeFlag</STRONG>( LOGICAL*1 <EM>flag</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>flag</EM>	Specifies the current edge flag	value, either <STRONG>GL_TRUE</STRONG>		or <STRONG>GL_FALSE</STRONG>. The initial value is <STRONG>GL_TRUE</STRONG>.     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fglEdgeFlagv</STRONG>( CHARACTER*8 <EM>flag</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>flag</EM> Specifies a pointer to an array that contains a single	       boolean element,	which replaces the current edge	flag	       value.     <STRONG>DESCRIPTION</STRONG>	  Each vertex of a polygon, separate triangle, or separate	  quadrilateral	specified between a <STRONG>fglBegin</STRONG>/<STRONG>fglEnd</STRONG> pair is	  marked as the	start of either	a boundary or nonboundary	  edge.	 If the	current	edge flag is true when the vertex is	  specified, the vertex	is marked as the start of a boundary	  edge.	 Otherwise, the	vertex is marked as the	start of a	  nonboundary edge.  <STRONG>fglEdgeFlag</STRONG> sets the edge flag bit	to	  <STRONG>GL_TRUE</STRONG> if <EM>flag</EM> is <STRONG>GL_TRUE</STRONG>, and to <STRONG>GL_FALSE</STRONG> otherwise.	  The vertices of connected triangles and connected	  quadrilaterals are always marked as boundary,	regardless of	  the value of the edge	flag.	  Boundary and nonboundary edge	flags on vertices are	  significant only if <STRONG>GL_POLYGON_MODE</STRONG> is set to	<STRONG>GL_POINT</STRONG> or	  <STRONG>GL_LINE</STRONG>.  See	<STRONG>fglPolygonMode</STRONG>.     <STRONG>NOTES</STRONG>	  The current edge flag	can be updated at any time.  In	  particular, <STRONG>fglEdgeFlag</STRONG> can be called	between	a call to	  <STRONG>fglBegin</STRONG> and the corresponding call to <STRONG>fglEnd</STRONG>.     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>	  <STRONG>fglGet</STRONG> with argument <STRONG>GL_EDGE_FLAG</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>fglBegin</STRONG>, <STRONG>fglEdgeFlagPointer</STRONG>,	<STRONG>fglPolygonMode</STRONG></PRE></BODY></HTML>

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