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.PS
# Shaky.m4
gen_init
NeedDpicTools
divert(-1)
`An attempt to draw shaky hand-drawn lines'
`shakyline(linespec,type,s=shake,[shakevals])
Draw a line with a tremor
arg3: s=shake parameter (default 1)
arg4=normal(0,1) perturbations used if given'
define(`shakyline',
`rpoint_(ifelse(`$1',,`to rvec_(linewid,0)',`$1'))
M4_start: last line.start
M4_end: last line.end
[ Start: M4_start
End: M4_end
llen = distance(Start,End)
npts = round_(llen/linewid*4)
setkey_($3,s,1)
if "$4"=="" then { randn(d,npts-1,0,m4s*(llen/npts/8)) }\
else { for i=1 to npts-1 do { d[i] = $4[i]*m4s*(llen/npts/8) }}
P[0]: Start
for i=1 to npts-1 do { P[i]: i/npts between Start and End + (vec_(0,d[i])) }
P[npts]: End
spline $2 from P[0] to P[1]
for i=2 to npts do { continue to P[i] }
] with .Start at last line.start; move to last line.end')
`shakyarc(arcspec,type,s=shake,[shakevals])
Draw an arc with a tremor
arg3: s=shake parameter (default 1)
arg4=normal(0,1) perturbations used if given'
define(`shakyarc',
`arc invis $1
M4_start: last arc.start
M4_end: last arc.end
M4_C: last arc.c
[ Start: M4_start
End: M4_end
C: M4_C
as = atan2(Start.y-C.y,Start.x-C.x)
ae = atan2(End.y-C.y,End.x-C.x)
ar = distance(Start,C)
llen = abs(ar*(ae-as))
npts = round_(llen/linewid*4)
setkey_($3,s,1)
if "$4"=="" then { randn(d,npts-1,0,m4s*(llen/npts/8)) }\
else { for i=1 to npts-1 do { d[i] = $4[i]*m4s*(llen/npts/8) }}
P[0]: Start
for i=1 to npts-1 do { P[i]: C + (rect_(ar+d[i],as+i/npts*(ae-as))) }
P[npts]: End
spline $2 from P[0] to P[1]
for i=2 to npts do { continue to P[i] }
] with .Start at last arc.start; move to last arc.end')
`shakyspline(points,type,s=shake,[shakevals])
Draw a spline with a tremor
arg3: s=shake parameter (default 1)
arg4=normal(0,1) perturbations used if given'
define(`shakyspline',
`rpoint_(ifelse(`$1',,`to rvec_(linewid,0)',`$1'))
M4_start: last line.start
M4_end: last line.end
[ Start: M4_start
End: M4_end
llen = distance(Start,End)
npts = round_(llen/linewid*4)
setkey_($3,s,1)
if "$4"=="" then { randn(d,npts-1,0,m4s*(llen/npts/8)) }\
else { for i=1 to npts-1 do { d[i] = $4[i]*m4s*(llen/npts/8) }}
P[0]: Start
for i=1 to npts-1 do { P[i]: i/npts between Start and End + (vec_(0,d[i])) }
P[npts]: End
spline $2 from P[0] to P[1]
for i=2 to npts do { continue to P[i] }
] with .Start at last line.start; move to last line.end')
`shakyfitcurve(V,n,linetype,
m (default 0),s=val,[shakevals])
Like fitcurve but the control points
are perturbed
arg5: s=shake parameter (default 1)
arg6=normal(0,1) perturbations used if given'
define(`shakyfitcurve',`
{[ m4fn = `$2'; m4fm = ifelse(`$4',,0,`$4')
M4P_[0]: `$1'[m4fm]
setkey_($5,s,1)
# if "$6"=="" then { !!!!
# else { for i=1 to npts-1 do { d[i] = $5[i]*m4s*(llen/npts/8) }}
for i=m4fm+1 to m4fn-1 do { M4P_[i-m4fm]: `$1'[i]*(4/3) }
M4P_[m4fn-m4fm]: `$1'[m4fn]
n = m4fn-m4fm
# forward substitution
M4P_[1]: M4P_[1]-M4P_[0]/6
d[1] = 1
for i = 2 to n-1 do {
M4P_[i]: M4P_[i]-M4P_[i-1]/(d[i-1]*6)
d[i] = 1-1/d[i-1]/36 }
# backward substitution
for i= n-1 to 1 by -1 do {
M4P_[i]: (M4P_[i]-M4P_[i+1]/6)/d[i] }
# draw using computed control points
spline 0.55 `$3' from M4P_[0] to 11/32 between M4P_[0] and M4P_[1] \
then to 5/32 between M4P_[1] and M4P_[2]
for i=2 to n-2 do { continue to M4P_[i] }
continue to 27/32 between M4P_[n-2] and M4P_[n-1] \
then to 21/32 between M4P_[n-1] and M4P_[n] then to M4P_[n]
] with .M4P_[0] at `$1'[ifelse(`$4',,0,`$4')]} ')
divert(0)
[
linethick = 2.5
round(,,colored "gray")
nl = 10
for i=1 to nl do {
shakyline(right 6/nl up 2*(2*pmod(i,2)-1),colored "gray",s=1)
round(,,colored "gray") }
]
[
linethick = 2.5
na = 3
arcrad = 1
for i=1 to na do {
shakyarc(,colored "gray",s=1)
}
] with .nw at last [].sw +(0,-1)
[
linethick = 2.5
na = 3
arcrad = 2
for i=1 to na do {
shakyarc(,colored "gray",s=1)
}
] with .sw at last [].se +(1,0)
.PE
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