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|
//! For creating a Gradient.
use iced_native::Color;
use crate::gradient::linear::Linear;
use crate::Point;
#[derive(Debug, Clone, PartialEq)]
/// A fill which transitions colors progressively along a direction, either linearly, radially (TBD),
/// or conically (TBD).
pub enum Gradient {
/// A linear gradient interpolates colors along a direction from its [`start`] to its [`end`]
/// point.
Linear(Linear),
}
#[derive(Debug, Clone, Copy, PartialEq)]
/// A point along the gradient vector where the specified [`color`] is unmixed.
pub struct ColorStop {
/// Offset along the gradient vector.
pub offset: f32,
/// The color of the gradient at the specified [`offset`].
pub color: Color,
}
impl Gradient {
/// Creates a new linear [`linear::Builder`].
pub fn linear(start: Point, end: Point) -> linear::Builder {
linear::Builder::new(start, end)
}
}
/// Linear gradient builder & definition.
pub mod linear {
use crate::gradient::{ColorStop, Gradient};
use crate::{Color, Point};
/// A linear gradient that can be used in the style of [`super::Fill`] or [`super::Stroke`].
#[derive(Debug, Clone, PartialEq)]
pub struct Linear {
/// The point where the linear gradient begins.
pub start: Point,
/// The point where the linear gradient ends.
pub end: Point,
/// [`ColorStop`]s along the linear gradient path.
pub color_stops: Vec<ColorStop>,
}
/// A [`Linear`] builder.
#[derive(Debug)]
pub struct Builder {
start: Point,
end: Point,
stops: Vec<(f32, Color)>,
valid: bool,
}
impl Builder {
/// Creates a new [`Builder`].
pub fn new(start: Point, end: Point) -> Self {
Self {
start,
end,
stops: vec![],
valid: true,
}
}
/// Adds a new stop, defined by an offset and a color, to the gradient.
///
/// `offset` must be between `0.0` and `1.0`.
pub fn add_stop(mut self, offset: f32, color: Color) -> Self {
if !(0.0..=1.0).contains(&offset) {
self.valid = false;
}
self.stops.push((offset, color));
self
}
/// Builds the linear [`Gradient`] of this [`Builder`].
///
/// Returns `None` if no stops were added to the builder or
/// if stops not between 0.0 and 1.0 were added.
pub fn build(self) -> Option<Gradient> {
if self.stops.is_empty() || !self.valid {
return None;
}
let mut stops: Vec<ColorStop> = self.stops.clone().into_iter().map(|f| ColorStop {
offset: f.0,
color: f.1
}).collect();
stops.sort_by(|a, b| a.offset.partial_cmp(&b.offset).unwrap());
Some(Gradient::Linear(Linear {
start: self.start,
end: self.end,
color_stops: stops
}))
}
}
}
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