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|
//! A gradient that can be used as a [`Fill`] for a mesh.
//!
//! For a gradient that you can use as a background variant for a widget, see [`Gradient`].
//!
//! [`Gradient`]: crate::core::Gradient;
use crate::core::Point;
pub use linear::Linear;
#[derive(Debug, Clone, PartialEq)]
/// A fill which linearly interpolates colors along a direction.
///
/// For a gradient which can be used as a fill for a background of a widget, see [`crate::core::Gradient`].
pub enum Gradient {
/// A linear gradient interpolates colors along a direction from its `start` to its `end`
/// point.
Linear(Linear),
}
impl Gradient {
/// Creates a new linear [`linear::Builder`].
///
/// The `start` and `end` [`Point`]s define the absolute position of the [`Gradient`].
pub fn linear(start: Point, end: Point) -> linear::Builder {
linear::Builder::new(start, end)
}
}
pub mod linear {
//! Linear gradient builder & definition.
use crate::Gradient;
use iced_core::gradient::ColorStop;
use iced_core::{Color, Point};
use std::cmp::Ordering;
/// A linear gradient that can be used in the style of [`Fill`] or [`Stroke`].
///
/// [`Fill`]: crate::geometry::Fill;
/// [`Stroke`]: crate::geometry::Stroke;
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Linear {
/// The absolute starting position of the gradient.
pub start: Point,
/// The absolute ending position of the gradient.
pub end: Point,
/// [`ColorStop`]s along the linear gradient direction.
pub color_stops: [Option<ColorStop>; 8],
}
/// A [`Linear`] builder.
#[derive(Debug)]
pub struct Builder {
start: Point,
end: Point,
stops: [Option<ColorStop>; 8],
}
impl Builder {
/// Creates a new [`Builder`].
pub fn new(start: Point, end: Point) -> Self {
Self {
start,
end,
stops: [None; 8],
}
}
/// Adds a new [`ColorStop`], defined by an offset and a color, to the gradient.
///
/// Any `offset` that is not within `0.0..=1.0` will be silently ignored.
///
/// Any stop added after the 8th will be silently ignored.
pub fn add_stop(mut self, offset: f32, color: Color) -> Self {
if offset.is_finite() && (0.0..=1.0).contains(&offset) {
let (Ok(index) | Err(index)) =
self.stops.binary_search_by(|stop| match stop {
None => Ordering::Greater,
Some(stop) => stop.offset.partial_cmp(&offset).unwrap(),
});
if index < 8 {
self.stops[index] = Some(ColorStop { offset, color });
}
} else {
log::warn!(
"Gradient: ColorStop must be within 0.0..=1.0 range."
);
};
self
}
/// Adds multiple [`ColorStop`]s to the gradient.
///
/// Any stop added after the 8th will be silently ignored.
pub fn add_stops(
mut self,
stops: impl IntoIterator<Item = ColorStop>,
) -> Self {
for stop in stops.into_iter() {
self = self.add_stop(stop.offset, stop.color)
}
self
}
/// Builds the linear [`Gradient`] of this [`Builder`].
///
/// Returns `BuilderError` if gradient in invalid.
pub fn build(self) -> Gradient {
Gradient::Linear(Linear {
start: self.start,
end: self.end,
color_stops: self.stops,
})
}
}
}
|
