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//! For creating a Gradient.
mod linear;
pub use crate::gradient::linear::{Linear, Position, Location};
use crate::widget::canvas::frame::Transform;
use crate::Color;
use crate::widget::canvas::{Fill, fill};
#[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(position: impl Into<Position>) -> linear::Builder {
linear::Builder::new(position.into())
}
/// Modifies the start & end stops of the gradient to have a proper transform value.
pub(crate) fn transform(mut self, transform: &Transform) -> Self {
match &mut self {
Gradient::Linear(linear) => {
linear.start = transform.transform_point(linear.start);
linear.end = transform.transform_point(linear.end);
}
}
self
}
}
impl<'a> Into<Fill<'a>> for &'a Gradient {
fn into(self) -> Fill<'a> {
Fill {
style: fill::Style::Gradient(self),
.. Default::default()
}
}
}
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