Centering both axes

[abiriadev]

First of all, please let me know if this is not the appropriate place to ask basic questions.

And I'd like to express gratitude for creating this awesome crate! I am currently following the official example and trying to customize it as much as possible.

My question is, how can I align (both) X and Y axes to the center of the chart? I've searched the docs and investigated MeshStyle struct but couldn't find any similar method. I've looked for similar issues or discussions, but with no luck.

Below is the entire code:

use std::{error::Error, f64::consts::PI};

use plotters::{
	prelude::{
		BitMapBackend, ChartBuilder, Circle, EmptyElement, IntoDrawingArea,
		Text,
	},
	series::PointSeries,
	style::{full_palette::PURPLE, IntoFont, WHITE},
};

fn w_n(n: u32) -> Vec<(f64, f64)> {
	(0..n)
		.into_iter()
		.map(|r| {
			let (s, c) = ((2. * PI) / (n as f64) * r as f64).sin_cos();
			(c, s)
		})
		.collect()
}

fn main() -> Result<(), Box<dyn Error>> {
	let root =
		BitMapBackend::new("chart.png", (1200, 1200)).into_drawing_area();

	root.fill(&WHITE)?;

	let mut chart = ChartBuilder::on(&root)
		.margin(5)
		.x_label_area_size(30)
		.y_label_area_size(30)
		.build_cartesian_2d(-1.5f64..1.5, -1.5f64..1.5)?;

	chart
		.configure_mesh()
		.max_light_lines(0)
		.draw()?;

	chart.draw_series(PointSeries::of_element(
		w_n(5),
		5,
		&PURPLE,
		&|c, s, st| {
			EmptyElement::at(c)
				+ Circle::new((0, 0), s, st.filled())
				+ Text::new(
					format!("({:.2?}, {:.2?})", c.0, c.1),
					(15, 0),
					("sans-serif", 20).into_font(),
				)
		},
	))?;

	root.present()?;

	Ok(())
}

It looks great but I want both axes to be at the center so that it can show where is the origin.

I am using plotters 0.3.4. If you need additional context, I can add more details later.

Thank you in advance for your help.

[Fabus1184]

Any updates on this? Seems like a very common use case to me...