* Re: Colors in lmt_surface and luametafun
2020-04-17 13:33 Colors in lmt_surface and luametafun Otared Kavian
@ 2020-04-17 13:59 ` Hans Hagen
0 siblings, 0 replies; 2+ messages in thread
From: Hans Hagen @ 2020-04-17 13:59 UTC (permalink / raw)
To: Otared Kavian, ntg-context
On 4/17/2020 3:33 PM, Otared Kavian wrote:
> Hi Hans,
>
> On page 36 of luametafun.pdf there is the following example of using lmt_surface:
>
> \startMPcode{doublefun}
> draw lmt_surface [
> preamble = "local sin, cos = math.sin, math.cos",
> code = "sin(x*x) - cos(y*y)",
> color = "f, f/2, 1-f",
> color = "f, f, 0",
> xstep = .02,
> ystep = .02,
> xvector = {-0.4, -0.4},
> height = 10cm,
> lines = true,
> ] xsized .TextWidth ;
> \stopMPcode
>
> What is the meaning of « f » in « color = "f, f/5, 1-f" »?
> Is it possible to specify other colors and how can it be done?
f = fraction
you can write some function yourself
\starttext
\startMPcode{doublefun}
draw lmt_surface [
preamble = "local sin, cos = math.sin, math.cos",
code = "sin(x*x) - cos(y*y)",
color = "f, f, 0",
xstep = .02,
ystep = .02,
xvector = {-0.4, -0.4},
height = 5cm,
lines = true,
] ysized (TextHeight/4) ;
\stopMPcode
\startluacode
function MyColor(f) return f/2, f/3, .5 end
\stopluacode
\startMPcode{doublefun}
draw lmt_surface [
preamble = "local sin, cos = math.sin, math.cos",
code = "sin(x*x) - cos(y*y)",
color = "MyColor(f)",
xstep = .02,
ystep = .02,
xvector = {-0.4, -0.4},
height = 5cm,
lines = true,
] ysized (TextHeight/4) ;
\stopMPcode
\startMPcode{doublefun}
draw lmt_surface [
preamble = "local sin, cos = math.sin, math.cos " &
"function MyColor(f) return 0, f/3, .5 end",
code = "sin(x*x) - cos(y*y)",
color = "MyColor(f)",
xstep = .02,
ystep = .02,
xvector = {-0.4, -0.4},
height = 5cm,
lines = true,
] ysized (TextHeight/4) ;
\stopMPcode
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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