1 files changed, 83 insertions, 0 deletions
diff --git a/vendor/plotters/examples/normal-dist2.rs b/vendor/plotters/examples/normal-dist2.rs
new file mode 100644
index 000000000..6c84ab3ab
--- /dev/null
+++ b/vendor/plotters/examples/normal-dist2.rs
@@ -0,0 +1,83 @@
+use plotters::prelude::*;
+
+use rand::SeedableRng;
+use rand_distr::{Distribution, Normal};
+use rand_xorshift::XorShiftRng;
+
+use num_traits::sign::Signed;
+
+const OUT_FILE_NAME: &'static str = "plotters-doc-data/normal-dist2.png";
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let sd = 0.60;
+
+    let random_points: Vec<f64> = {
+        let norm_dist = Normal::new(0.0, sd).unwrap();
+        let mut x_rand = XorShiftRng::from_seed(*b"MyFragileSeed123");
+        let x_iter = norm_dist.sample_iter(&mut x_rand);
+        x_iter.take(5000).filter(|x| x.abs() <= 4.0).collect()
+    };
+
+    let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();
+
+    root.fill(&WHITE)?;
+
+    let mut chart = ChartBuilder::on(&root)
+        .margin(5)
+        .caption("1D Gaussian Distribution Demo", ("sans-serif", 30))
+        .set_label_area_size(LabelAreaPosition::Left, 60)
+        .set_label_area_size(LabelAreaPosition::Bottom, 60)
+        .set_label_area_size(LabelAreaPosition::Right, 60)
+        .build_cartesian_2d(-4f64..4f64, 0f64..0.1)?
+        .set_secondary_coord(
+            (-4f64..4f64).step(0.1).use_round().into_segmented(),
+            0u32..500u32,
+        );
+
+    chart
+        .configure_mesh()
+        .disable_x_mesh()
+        .disable_y_mesh()
+        .y_label_formatter(&|y| format!("{:.0}%", *y * 100.0))
+        .y_desc("Percentage")
+        .draw()?;
+
+    chart.configure_secondary_axes().y_desc("Count").draw()?;
+
+    let actual = Histogram::vertical(chart.borrow_secondary())
+        .style(GREEN.filled())
+        .margin(3)
+        .data(random_points.iter().map(|x| (*x, 1)));
+
+    chart
+        .draw_secondary_series(actual)?
+        .label("Observed")
+        .legend(|(x, y)| Rectangle::new([(x, y - 5), (x + 10, y + 5)], GREEN.filled()));
+
+    let pdf = LineSeries::new(
+        (-400..400).map(|x| x as f64 / 100.0).map(|x| {
+            (
+                x,
+                (-x * x / 2.0 / sd / sd).exp() / (2.0 * std::f64::consts::PI * sd * sd).sqrt()
+                    * 0.1,
+            )
+        }),
+        &RED,
+    );
+
+    chart
+        .draw_series(pdf)?
+        .label("PDF")
+        .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], RED.filled()));
+
+    chart.configure_series_labels().draw()?;
+
+    // To avoid the IO failure being ignored silently, we manually call the present function
+    root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
+    println!("Result has been saved to {}", OUT_FILE_NAME);
+
+    Ok(())
+}
+#[test]
+fn entry_point() {
+    main().unwrap()
+}