diff options
author | Karl Berry <karl@freefriends.org> | 2006-01-17 21:41:51 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2006-01-17 21:41:51 +0000 |
commit | 487ca4806cc046076293cf6cc5fbba0db282bac7 (patch) | |
tree | 847b412ab5158dd7bdd7ed7e5a4cc3fbca94be32 /Build/source/texk/seetexk/conv.c | |
parent | a3d3111bfe26b8e5f5bc6049dfb2a4ca2edc7881 (diff) |
texk 1
git-svn-id: svn://tug.org/texlive/trunk@1485 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/seetexk/conv.c')
-rw-r--r-- | Build/source/texk/seetexk/conv.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Build/source/texk/seetexk/conv.c b/Build/source/texk/seetexk/conv.c new file mode 100644 index 00000000000..f2b096e8ddd --- /dev/null +++ b/Build/source/texk/seetexk/conv.c @@ -0,0 +1,52 @@ +/* + * Copyright (c) 1987, 1989 University of Maryland + * Department of Computer Science. All rights reserved. + * Permission to copy for any purpose is hereby granted + * so long as this copyright notice remains intact. + */ + +#ifndef lint +static char rcsid[] = "$Header: /usr/src/local/tex/local/mctex/lib/RCS/conv.c,v 3.1 89/08/22 21:48:01 chris Exp $"; +#endif + +/* + * Conversions. + */ + +#include "types.h" +#include "conv.h" + +double DMagFactor(); + +Conv Conversion; /* the global conversion */ + +/* + * Set a conversion (possibly the global conversion). + */ +void +CSetConversion(c, dpi, usermag, num, denom, dvimag) + register struct conversion *c; + int dpi, usermag; + i32 num, denom, dvimag; +{ + double ddpi = dpi; + + c->c_mag = DMagFactor((int) dvimag) * DMagFactor(usermag); + c->c_dpi = ddpi; + + /* + * The conversion facture is figured as follows: there are exactly + * num/denom DVI units per decimicron, and 254000 decimicrons per + * inch, and dpi pixels per inch. Then we have to adjust this by + * the stated magnification. + */ + c->c_fromsp = (num / 254000.0) * (ddpi / denom) * c->c_mag; + + /* + * c->c_tosp is 1/c->c_fromsp, but we will invert the expression + * above in the hopes of some extra accuracy. + * + * IS THIS ANY GOOD? I NEED A NUMERICAL ANALYST! + */ + c->c_tosp = (254000.0 / num) * (denom / ddpi) * (1.0 / c->c_mag); +} |