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95 lines
2.4 KiB
Rust
95 lines
2.4 KiB
Rust
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pub use pathfinder_geometry::*;
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use vector::{vec2f, Vector2F};
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pub(crate) struct Vertex {
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xy_position: Vector2F,
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st_position: Vector2F,
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}
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pub struct Path {
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vertices: Vec<Vertex>,
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start: Vector2F,
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current: Vector2F,
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countours_len: usize,
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}
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enum Kind {
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Solid,
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Quadratic,
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}
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impl Path {
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fn new() -> Self {
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Self {
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vertices: Vec::new(),
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start: vec2f(0., 0.),
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current: vec2f(0., 0.),
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countours_len: 0,
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}
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}
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pub fn reset(&mut self, point: Vector2F) {
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self.vertices.clear();
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self.start = point;
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self.current = point;
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self.countours_len = 0;
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}
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pub fn line_to(&mut self, point: Vector2F) {
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self.countours_len += 1;
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if self.countours_len > 1 {
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self.push_triangle(self.start, self.current, point, Kind::Solid);
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}
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self.current = point;
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}
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pub fn curve_to(&mut self, point: Vector2F, ctrl: Vector2F) {
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self.countours_len += 1;
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if self.countours_len > 1 {
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self.push_triangle(self.start, self.current, point, Kind::Solid);
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}
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self.push_triangle(self.current, ctrl, point, Kind::Quadratic);
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self.current = point;
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}
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pub(crate) fn close(self) -> Vec<Vertex> {
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self.vertices
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}
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fn push_triangle(&mut self, a: Vector2F, b: Vector2F, c: Vector2F, kind: Kind) {
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match kind {
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Kind::Solid => {
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self.vertices.push(Vertex {
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xy_position: a,
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st_position: vec2f(0., 1.),
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});
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self.vertices.push(Vertex {
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xy_position: b,
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st_position: vec2f(0., 1.),
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});
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self.vertices.push(Vertex {
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xy_position: c,
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st_position: vec2f(0., 1.),
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});
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}
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Kind::Quadratic => {
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self.vertices.push(Vertex {
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xy_position: a,
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st_position: vec2f(0., 0.),
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});
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self.vertices.push(Vertex {
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xy_position: b,
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st_position: vec2f(0.5, 0.),
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});
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self.vertices.push(Vertex {
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xy_position: c,
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st_position: vec2f(1., 1.),
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});
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}
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}
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}
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}
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