skia-rs-path 0.2.1

Path geometry and operations for skia-rs
Documentation 
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//! Path measurement and traversal.

use crate::Path;
use skia_rs_core::{Matrix, Point, Scalar};

/// Measures the length of a path and allows querying points along it.
#[derive(Debug)]
pub struct PathMeasure {
    path: Path,
    contour_lengths: Vec<Scalar>,
    total_length: Scalar,
}

impl PathMeasure {
    /// Create a new path measure.
    pub fn new(path: &Path) -> Self {
        let mut measure = Self {
            path: path.clone(),
            contour_lengths: Vec::new(),
            total_length: 0.0,
        };
        measure.compute_lengths();
        measure
    }

    /// Get the total length of the path.
    #[inline]
    pub fn length(&self) -> Scalar {
        self.total_length
    }

    /// Get the number of contours.
    #[inline]
    pub fn contour_count(&self) -> usize {
        self.contour_lengths.len()
    }

    /// Get the length of a specific contour.
    pub fn contour_length(&self, index: usize) -> Option<Scalar> {
        self.contour_lengths.get(index).copied()
    }

    /// Get a point at a distance along the path.
    pub fn get_point_at(&self, distance: Scalar) -> Option<Point> {
        if distance < 0.0 || distance > self.total_length {
            return None;
        }
        // TODO: Implement point interpolation
        let _ = distance;
        None
    }

    /// Get the tangent at a distance along the path.
    pub fn get_tangent_at(&self, distance: Scalar) -> Option<Point> {
        if distance < 0.0 || distance > self.total_length {
            return None;
        }
        // TODO: Implement tangent calculation
        let _ = distance;
        None
    }

    /// Get the transformation matrix at a distance along the path.
    pub fn get_matrix_at(&self, distance: Scalar) -> Option<Matrix> {
        if distance < 0.0 || distance > self.total_length {
            return None;
        }
        // TODO: Implement matrix calculation
        let _ = distance;
        None
    }

    /// Get a segment of the path.
    pub fn get_segment(&self, start: Scalar, end: Scalar) -> Option<Path> {
        if start >= end || start < 0.0 || end > self.total_length {
            return None;
        }
        // TODO: Implement segment extraction
        let _ = (start, end);
        None
    }

    fn compute_lengths(&mut self) {
        // TODO: Implement length computation
        // This requires flattening curves and summing segment lengths
        self.total_length = 0.0;
    }
}