polar coordinates with ggplotd
brocolis via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Sun Sep 18 15:13:35 PDT 2016
On Sunday, 18 September 2016 at 22:07:31 UTC, brocolis wrote:
> I've tried this code.
>
> import ggplotd.ggplotd;
> import ggplotd.geom;
> import ggplotd.aes;
> import ggplotd.axes;
> import std.math;
>
> auto r(double theta)
> {
> return 2 * sin(6*theta);
> }
>
> auto getX(double theta)
> {
> return r(theta) * cos(theta);
> }
>
> auto getY(double theta)
> {
> return r(theta) * sin(theta);
> }
>
> void main()
> {
> import std.array : array;
> import std.algorithm : map;
> import std.range : iota;
>
> auto theta = iota(0, 2*PI, 0.1).array;
> auto xs = theta.map!((x) => getX(x)).array;
> auto ys = xs.map!((x) => getY(x)).array;
>
> auto gg = GGPlotD().put( geomLine( Aes!(typeof(xs), "x",
> typeof(ys), "y")(xs, ys) ) );
>
> gg.put( xaxisRange(-5, 5) ).put( xaxisLabel( "x" ) );
> gg.put( yaxisRange(-5, 5) ).put( yaxisLabel( "y" ) );
> gg.put( xaxisOffset(0) ).put( yaxisOffset(0) );
> gg.save( "output.png", 500, 300 );
> }
>
> And I got the output: http://imgur.com/KwLYJpN
>
> Expected:
> https://www.wolframalpha.com/input/?i=polar+plot+2*sin(6*theta)
>
> I need to somehow activate "polar" mode in ggplotd. Thanks.
Found an error in ys line. Thanks.
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