Enum FillRule 

pub enum FillRule {
    NonZero,
    EvenOdd,
}

Which winding rule decides a path’s interior.

use pdfrum_render::scanline::{Coverage, FillRule, Rasterizer};

// Two nested squares wound the same way: non-zero fills the hole,
// even-odd leaves it clear.
let covered = |rule| {
    let mut rasterizer = Rasterizer::new();
    for (lo, hi) in [(0.0, 6.0), (2.0, 4.0)] {
        rasterizer.move_to(lo, lo);
        rasterizer.line_to(hi, lo);
        rasterizer.line_to(hi, hi);
        rasterizer.line_to(lo, hi);
        rasterizer.close_polygon();
    }
    let mut len = 0;
    rasterizer.sweep(rule, Coverage::Exact, |_, l, y, _| {
        if y == 3 {
            len += l;
        }
    });
    len
};
assert_eq!(covered(FillRule::NonZero), 6);
assert_eq!(covered(FillRule::EvenOdd), 4);

Variants

NonZero

Non-zero winding: covered where the signed crossing count is not zero.

EvenOdd

Even-odd: covered where the crossing count is odd.

Trait Implementations

impl Clone for FillRule

fn clone(&self) -> FillRule

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FillRule

impl Debug for FillRule

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

Formats the value using the given formatter.

impl Default for FillRule

fn default() -> FillRule

Returns the “default value” for a type.

impl Eq for FillRule

impl PartialEq for FillRule

fn eq(&self, other: &FillRule) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for FillRule