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% parafusoprojxy.mp
% L. Nobre G.
% 2009
input featpost3Dplus2D;
def theline( expr TheVal ) =
begingroup
numeric par[], cred, cgre, cblu, param;
par0 = 0;
par1 = 6*360;
par2 = 0.3;
par3 = 850;
param = par0+TheVal*(par1-par0);
cred = -par2*cosd( param );
cblu = par2*sind( param );
cgre = param/par3;
( (cred,cgre,cblu) )
endgroup
enddef;
def thexyline( expr TheVal ) =
begingroup
numeric par[], cred, cgre, param;
par0 = 0;
par1 = 6*360;
par2 = 0.3;
par3 = 850;
param = par0+TheVal*(par1-par0);
cred = -par2*cosd( param );
cgre = param/par3;
( (cred,cgre,0) )
endgroup
enddef;
f := (3,5,15);
beginfig(1);
numeric axsize, zaxpos, zaxlen;
color xbeg, xend, ybeg, yend, zbeg, zend;
axsize = 0.85;
zaxpos = 0.55;
zaxlen = 2.1;
pickup pencircle scaled 1.5pt;
xbeg = (axsize,0,0);
xend = (-axsize,0,0);
ybeg = (0,0,-axsize);
yend = (0,0,axsize);
zbeg = (zaxpos,-zaxpos,0);
zend = (zaxpos,zaxlen,0);
drawarrow rp( xbeg )--rp( xend );
drawarrow rp( ybeg )--rp( yend );
% defaultfont := "putr8r";
defaultscale := 0.65;
label.rt( "X", rp( xend ) );
label.lft( "Y", rp( yend ) );
emptyline( false, 1, black, 0.7background, 700, 0.8, 2, thexyline );
drawarrow rp( zbeg )--rp( zend );
label.bot( "Z", rp( zend ) );
endfig;
end;
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