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Jacob Rus
geodetic computer
Workspace
Fork
Published
By
Jacob Rus
Edited
Mar 22, 2019
Fork of
Halton Sequence
8 stars
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plastic
=
{
const
p1
=
0.7548776662466927
;
// inverse of plastic number
const
p2
=
0.5698402909980532
;
return
function
plastic
(
index
)
{
return
[
(
p1
*
index
)
%
1
,
(
p2
*
index
)
%
1
]
;
}
}
Insert cell
golden
=
{
const
p
=
0.618033988749894848
;
// inverse of golden ratio
return
function
golden
(
index
)
{
return
p
*
index
%
1
;
}
}
Insert cell
halton23
=
function
halton23
(
index
)
{
return
[
halton
(
index
,
2
)
,
halton
(
index
,
3
)
]
}
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halton
=
function
halton
(
index
,
base
)
{
let
fraction
=
1
;
let
result
=
0
;
while
(
index
>
0
)
{
fraction
/=
base
;
result
+=
fraction
*
(
index
%
base
)
;
index
=
~
~
(
index
/
base
)
;
// floor division
}
return
result
;
}
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npts
=
4000
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data
=
[
...
Array
(
npts
)
.
keys
(
)
]
.
map
(
halton23
)
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plastic_data
=
[
...
Array
(
npts
)
.
keys
(
)
]
.
map
(
plastic
)
Insert cell
coloring
=
(
d
,
i
)
=>
d3
.
interpolatePurples
(
Math
.
pow
(
i
/
npts
,
5
)
)
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framerate
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plastic
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golden
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halton23
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halton
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data
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coloring
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d3
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