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use std::fmt::{self, Debug, Formatter};
use ecow::EcoString;
use crate::foundations::{cast, Repr, Smart};
use crate::visualize::{Color, Gradient, Pattern, RelativeTo};
/// How a fill or stroke should be painted.
#[derive(Clone, Eq, PartialEq, Hash)]
pub enum Paint {
/// A solid color.
Solid(Color),
/// A gradient.
Gradient(Gradient),
/// A pattern.
Pattern(Pattern),
}
impl Paint {
/// Unwraps a solid color used for text rendering.
pub fn unwrap_solid(&self) -> Color {
match self {
Self::Solid(color) => *color,
Self::Gradient(_) | Self::Pattern(_) => panic!("expected solid color"),
}
}
/// Gets the relative coordinate system for this paint.
pub fn relative(&self) -> Smart<RelativeTo> {
match self {
Self::Solid(_) => Smart::Auto,
Self::Gradient(gradient) => gradient.relative(),
Self::Pattern(pattern) => pattern.relative(),
}
}
/// Turns this paint into a paint for a text decoration.
///
/// If this paint is a gradient, it will be converted to a gradient with
/// relative set to [`RelativeTo::Parent`].
pub fn as_decoration(&self) -> Self {
match self {
Self::Solid(color) => Self::Solid(*color),
Self::Gradient(gradient) => {
Self::Gradient(gradient.clone().with_relative(RelativeTo::Parent))
}
Self::Pattern(pattern) => {
Self::Pattern(pattern.clone().with_relative(RelativeTo::Parent))
}
}
}
}
impl Debug for Paint {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self {
Self::Solid(v) => v.fmt(f),
Self::Gradient(v) => v.fmt(f),
Self::Pattern(v) => v.fmt(f),
}
}
}
impl From<Pattern> for Paint {
fn from(pattern: Pattern) -> Self {
Self::Pattern(pattern)
}
}
impl Repr for Paint {
fn repr(&self) -> EcoString {
match self {
Self::Solid(color) => color.repr(),
Self::Gradient(gradient) => gradient.repr(),
Self::Pattern(pattern) => pattern.repr(),
}
}
}
impl<T: Into<Color>> From<T> for Paint {
fn from(t: T) -> Self {
Self::Solid(t.into())
}
}
impl From<Gradient> for Paint {
fn from(gradient: Gradient) -> Self {
Self::Gradient(gradient)
}
}
cast! {
Paint,
self => match self {
Self::Solid(color) => color.into_value(),
Self::Gradient(gradient) => gradient.into_value(),
Self::Pattern(pattern) => pattern.into_value(),
},
color: Color => Self::Solid(color),
gradient: Gradient => Self::Gradient(gradient),
pattern: Pattern => Self::Pattern(pattern),
}
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