blob: 3ad0ac11c6321057c9ad661896d979b2ea6bcf8d [file] [log] [blame]
// Copyright 2022 The piet-gpu authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Also licensed under MIT license, at your choice.
use super::geometry::{Point, Rect};
/// Action of a path element.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum Verb {
MoveTo,
LineTo,
QuadTo,
CurveTo,
Close,
}
/// Element of a path represented by a verb and its associated points.
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum Element {
MoveTo(Point),
LineTo(Point),
QuadTo(Point, Point),
CurveTo(Point, Point, Point),
Close,
}
impl Element {
/// Returns the verb that describes the action of the path element.
pub fn verb(&self) -> Verb {
match self {
Self::MoveTo(..) => Verb::MoveTo,
Self::LineTo(..) => Verb::LineTo,
Self::QuadTo(..) => Verb::QuadTo,
Self::CurveTo(..) => Verb::CurveTo,
Self::Close => Verb::Close,
}
}
}
impl Rect {
pub fn elements(&self) -> impl Iterator<Item = Element> + Clone {
let elements = [
Element::MoveTo((self.min.x, self.min.y).into()),
Element::LineTo((self.max.x, self.min.y).into()),
Element::LineTo((self.max.x, self.max.y).into()),
Element::LineTo((self.min.x, self.max.y).into()),
Element::Close,
];
(0..5).map(move |i| elements[i])
}
}