[−][src]Crate cubic_spline
Interpolation method for computation of cubic spline points within the range of a discrete set of known points.
Example
use cubic_spline::{Points, Point, SplineOpts, TryFrom}; let source = vec![(10.0, 200.0), (256.0, 390.0), (512.0, 10.0), (778.0, 200.0)]; let opts = SplineOpts::new() .tension(0.5); let mut points = Points::try_from(&source).expect("expect valid points but"); let result = points.calc_spline(&opts).expect("cant construct spline points"); assert_eq!(result.get_ref().len(), 49); let inner_vec: &mut Vec<Point> = points.get_mut(); inner_vec.push(Point::new(7.7, 1.3)); inner_vec[1].x += 0.79; inner_vec.last_mut().iter_mut().for_each(|mut p| {p.tension = Some(0.7);}); points.invert_vertically(400.0); assert_eq!(points.get_ref()[1].y, 10.0); let calculated_points = points .calc_spline(&opts.num_of_segments(33)) .unwrap(); assert_eq!(calculated_points.into_inner().len(), 133);
For information on how a curve can be constructed and which points to accept, see the appropriate structures.
Custom points
If you already have some points you can implement From
trait for Point
struct and pass your points directly.
Example
use cubic_spline::{SplineOpts, Point, Points}; #[derive(Default)] struct MyPoint { vertical: u8, horizontal: u8, color: String, } impl<'a> From<&'a MyPoint> for Point { fn from(p: &'a MyPoint) -> Self { Point::new(p.horizontal as f64, p.vertical as f64) } } let my_points: Vec<MyPoint> = vec![MyPoint::default(),MyPoint::default()]; let spline = Points::from(&my_points) .calc_spline(&SplineOpts::default()) .unwrap(); assert_eq!(spline.get_ref().len(), 17);
Structs
Point | The point in 2d coordinate system. |
Points | Wrapper for your source points.
Prepares and validates points before calculating spline.
Create it with |
SplineOpts | A list of options indicating how the spline should be calculated |
Enums
Error | This type represents all possible errors that can occur when constructing new spline points. |
Constants
DEFAULT_APPROX_EQ_PRECISION | Default precision used for point comparison in |
DEFAULT_SEGMENTS | Default number of segments.
Will be used if not specified in |
DEFAULT_TENSION | Default tension of curve between passed points.
Will be used if not specified in |
Traits
TryFrom | The same as |
TryInto | The same as |
Functions
calc_spline | The main function that does all the work. |
Type Definitions
Result | Alias for a |