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.

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.

On Sunday, 18 September 2016 at 22:13:35 UTC, brocolis wrote:
> Found an error in ys line. Thanks.

Does that mean you solved it?

Currently there is no special support for other coordinate systems, but I recently added Guides for x/y coordinates which should make this relatively straightforward to implement and is next on the list. Not sure when I'll get a chunk of time to implement it though.

For now you will have to convert the coordinates yourself, before plotting them.

On Monday, 19 September 2016 at 12:34:56 UTC, Edwin van Leeuwen wrote:
> On Sunday, 18 September 2016 at 22:13:35 UTC, brocolis wrote:
>> Found an error in ys line. Thanks.
>
> Does that mean you solved it?
>
> Currently there is no special support for other coordinate systems, but I recently added Guides for x/y coordinates which should make this relatively straightforward to implement and is next on the list. Not sure when I'll get a chunk of time to implement it though.
>
> For now you will have to convert the coordinates yourself, before plotting them.

Yeah, problem solved. Thanks.