Struct rsgeo::prelude::Polygon

pub struct Polygon { /* fields omitted */ }

Polygon is a vector of points,which points should be closed. (The first and the last point should be same.)

The polygon can be convex or concave.

Implementations

impl Polygon

pub fn new(points: Vec<Point>) -> Result<Self, &'static str>

Create a new polygon.

But the rest of points should not be same.

Example

use rsgeo::prelude::{Point,Polygon};
let pa = Point::new(32.0,112.0).unwrap();
let pb = Point::new(35.1,112.0).unwrap();
let pc = Point::new(35.3,112.5).unwrap();
let pg = Polygon::new(vec![pa,pb,pc]);
assert!(pg.is_err());
let pg = Polygon::new(vec![pa,pb,pc,pa]);
assert_eq!(pg.unwrap().len(),4);

pub fn len(&self) -> usize

Returns the number of elements in the polygon

pub fn contains(&self, p: &Point) -> bool

judge if a point is in the polygon area

Example

use rsgeo::prelude::{Point,Polygon};
let pa = Point::new(32.0,112.0).unwrap();
let pb = Point::new(35.1,112.0).unwrap();
let pc = Point::new(35.3,112.5).unwrap();
let pg = Polygon::new(vec![pa,pb,pc,pa]).unwrap();
let pt1 =  Point::new(35.0,112.2).unwrap();
let pt2 =  Point::new(34.29,110.3).unwrap();
assert!(pg.contains(&pt1));
assert!(!pg.contains(&pt2));

pub fn is_empty(&self) -> bool

Returns true if the Polygon contains no elements.

Trait Implementations

impl Debug for Polygon

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.