1 use plotters::prelude::*; 2 3 use rand::SeedableRng; 4 use rand_distr::{Distribution, Normal}; 5 use rand_xorshift::XorShiftRng; 6 7 const OUT_FILE_NAME: &'static str = "plotters-doc-data/normal-dist.png"; main() -> Result<(), Box<dyn std::error::Error>>8 fn main() -> Result<(), Box<dyn std::error::Error>> { 9 let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area(); 10 11 root.fill(&WHITE)?; 12 13 let sd = 0.13; 14 15 let random_points: Vec<(f64, f64)> = { 16 let norm_dist = Normal::new(0.5, sd).unwrap(); 17 let mut x_rand = XorShiftRng::from_seed(*b"MyFragileSeed123"); 18 let mut y_rand = XorShiftRng::from_seed(*b"MyFragileSeed321"); 19 let x_iter = norm_dist.sample_iter(&mut x_rand); 20 let y_iter = norm_dist.sample_iter(&mut y_rand); 21 x_iter.zip(y_iter).take(5000).collect() 22 }; 23 24 let areas = root.split_by_breakpoints([944], [80]); 25 26 let mut x_hist_ctx = ChartBuilder::on(&areas[0]) 27 .y_label_area_size(40) 28 .build_cartesian_2d((0.0..1.0).step(0.01).use_round().into_segmented(), 0..250)?; 29 let mut y_hist_ctx = ChartBuilder::on(&areas[3]) 30 .x_label_area_size(40) 31 .build_cartesian_2d(0..250, (0.0..1.0).step(0.01).use_round())?; 32 let mut scatter_ctx = ChartBuilder::on(&areas[2]) 33 .x_label_area_size(40) 34 .y_label_area_size(40) 35 .build_cartesian_2d(0f64..1f64, 0f64..1f64)?; 36 scatter_ctx 37 .configure_mesh() 38 .disable_x_mesh() 39 .disable_y_mesh() 40 .draw()?; 41 scatter_ctx.draw_series( 42 random_points 43 .iter() 44 .map(|(x, y)| Circle::new((*x, *y), 2, GREEN.filled())), 45 )?; 46 let x_hist = Histogram::vertical(&x_hist_ctx) 47 .style(GREEN.filled()) 48 .margin(0) 49 .data(random_points.iter().map(|(x, _)| (*x, 1))); 50 let y_hist = Histogram::horizontal(&y_hist_ctx) 51 .style(GREEN.filled()) 52 .margin(0) 53 .data(random_points.iter().map(|(_, y)| (*y, 1))); 54 x_hist_ctx.draw_series(x_hist)?; 55 y_hist_ctx.draw_series(y_hist)?; 56 57 // To avoid the IO failure being ignored silently, we manually call the present function 58 root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir"); 59 println!("Result has been saved to {}", OUT_FILE_NAME); 60 61 Ok(()) 62 } 63 #[test] entry_point()64 fn entry_point() { 65 main().unwrap() 66 } 67
