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In the past I've had need of getting the length of a trace,
whether that trace be a segment (CLINESEG), path (CLINE) or of an
entire net. "show elements" on the trace yields the desired value but I
want the value to be available within a SKILL routine. So I wrote
my own set of functions to calculate the value for me. Here they
;----------------------------------------; length-finding utility functions; written by: Chris Walters;;; These functions will find the length of an etch trace; for a given segment, path, or entire net, respectively;; Revision History; 2006/12/13 Chris Walters; Initial release;----------------------------------------procedure( cdw_findSegLength( seg_db)prog((seglength pt1 pt2 pt3 chordlength rradius aangle xproduct)seglength = 0.0pt1 = car( seg_db->startEnd)pt2 = cadr( seg_db->startEnd)pt1.x = xCoord( pt1)pt1.y = yCoord( pt1)pt2.x = xCoord( pt2)pt2.y = yCoord( pt2)if( seg_db->objType == "arc" then pt3 = seg_db->xy pt3.x = xCoord( pt3) pt3.y = yCoord( pt3) chordlength = sqrt( (pt2.x - pt1.x)*(pt2.x - pt1.x) + (pt2.y - pt1.y)*(pt2.y - pt1.y) ) rradius = seg_db->radius ;determine angle formed by pt1 and pt2 with center at rradius aangle = 2 * asin( chordlength / (2 * rradius)) ; in radians ;determine whether arc is major or minor xproduct = (pt2.x - pt1.x)*(pt3.y - pt1.y) - (pt3.x - pt1.x)*(pt2.y - pt1.y) ; 2D cross-product cond( ( !seg_db->isClockwise && xproduct < 0.0 ; major arc seglength = (6.283185 - aangle) * rradius ) ( !seg_db->isClockwise && xproduct >= 0.0 ; minor arc seglength = aangle * rradius ) ( seg_db->isClockwise && xproduct < 0.0 ; minor arc seglength = aangle * rradius ) ( seg_db->isClockwise && xproduct >= 0.0 ; major arc seglength = (6.283185 - aangle) * rradius ) );end-condelse seglength = sqrt( (pt2.x - pt1.x)*(pt2.x - pt1.x) + (pt2.y - pt1.y)*(pt2.y - pt1.y) ));end-ifreturn( seglength));end-prog);end-procedure;----------------------------------------procedure( cdw_findPathLength( path_db)prog(( pathlength)pathlength = 0.0foreach( seg_db path_db->segments pathlength = pathlength + cdw_findSegLength( seg_db));end-foreach return( pathlength));end-prog);end-procedure;----------------------------------------procedure( cdw_findNetLength( net_db)prog(( netlength)netlength = 0.0foreach( net_br net_db->branches foreach( child_db net_br->children if( child_db->objType == "path" then netlength = netlength + cdw_findPathLength( child_db) );end-if );end-foreach);end-foreach return( netlength));end-prog);end-procedureMerry Christmas!Chris Walterslocal Cadence guru()