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//! One- and two-dimensional alignment ([`Align::Center`], [`Align2::LEFT_TOP`] etc).
use crate::*;
/// left/center/right or top/center/bottom alignment for e.g. anchors and layouts.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub enum Align {
/// Left or top.
Min,
/// Horizontal or vertical center.
Center,
/// Right or bottom.
Max,
}
impl Align {
/// Convenience for [`Self::Min`]
pub const LEFT: Self = Self::Min;
/// Convenience for [`Self::Max`]
pub const RIGHT: Self = Self::Max;
/// Convenience for [`Self::Min`]
pub const TOP: Self = Self::Min;
/// Convenience for [`Self::Max`]
pub const BOTTOM: Self = Self::Max;
#[deprecated = "Use Self::LEFT"]
pub fn left() -> Self {
Self::LEFT
}
#[deprecated = "Use Self::RIGHT"]
pub fn right() -> Self {
Self::RIGHT
}
#[deprecated = "Use Self::TOP"]
pub fn top() -> Self {
Self::TOP
}
#[deprecated = "Use Self::BOTTOM"]
pub fn bottom() -> Self {
Self::BOTTOM
}
/// Convert `Min => 0.0`, `Center => 0.5` or `Max => 1.0`.
#[inline(always)]
pub fn to_factor(self) -> f32 {
match self {
Self::Min => 0.0,
Self::Center => 0.5,
Self::Max => 1.0,
}
}
/// Convert `Min => -1.0`, `Center => 0.0` or `Max => 1.0`.
#[inline(always)]
pub fn to_sign(self) -> f32 {
match self {
Self::Min => -1.0,
Self::Center => 0.0,
Self::Max => 1.0,
}
}
/// ``` rust
/// assert_eq!(emath::Align::Min.align_size_within_range(2.0, 10.0..=20.0), 10.0..=12.0);
/// assert_eq!(emath::Align::Center.align_size_within_range(2.0, 10.0..=20.0), 14.0..=16.0);
/// assert_eq!(emath::Align::Max.align_size_within_range(2.0, 10.0..=20.0), 18.0..=20.0);
/// assert_eq!(emath::Align::Min.align_size_within_range(f32::INFINITY, 10.0..=20.0), 10.0..=f32::INFINITY);
/// assert_eq!(emath::Align::Center.align_size_within_range(f32::INFINITY, 10.0..=20.0), f32::NEG_INFINITY..=f32::INFINITY);
/// assert_eq!(emath::Align::Max.align_size_within_range(f32::INFINITY, 10.0..=20.0), f32::NEG_INFINITY..=20.0);
///
/// assert_eq!(emath::Align::Min.align_size_within_range(f32::INFINITY, 10.0..=f32::INFINITY), 10.0..=f32::INFINITY);
/// assert_eq!(emath::Align::Min.align_size_within_range(f32::INFINITY, f32::NEG_INFINITY..=10.0), f32::NEG_INFINITY..=10.0);
/// assert_eq!(emath::Align::Center.align_size_within_range(f32::INFINITY, 10.0..=f32::INFINITY), 10.0..=f32::INFINITY);
/// assert_eq!(emath::Align::Center.align_size_within_range(f32::INFINITY, f32::NEG_INFINITY..=10.0), f32::NEG_INFINITY..=10.0);
/// assert_eq!(emath::Align::Max.align_size_within_range(f32::INFINITY, 10.0..=f32::INFINITY), 10.0..=f32::INFINITY);
/// assert_eq!(emath::Align::Max.align_size_within_range(f32::INFINITY, f32::NEG_INFINITY..=10.0), f32::NEG_INFINITY..=10.0);
/// ```
#[inline]
pub fn align_size_within_range(
self,
size: f32,
range: RangeInclusive<f32>,
) -> RangeInclusive<f32> {
let min = *range.start();
let max = *range.end();
if max - min == f32::INFINITY && size == f32::INFINITY {
return range;
}
match self {
Self::Min => min..=min + size,
Self::Center => {
if size == f32::INFINITY {
f32::NEG_INFINITY..=f32::INFINITY
} else {
let left = (min + max) / 2.0 - size / 2.0;
left..=left + size
}
}
Self::Max => max - size..=max,
}
}
}
impl Default for Align {
#[inline(always)]
fn default() -> Align {
Align::Min
}
}
// ----------------------------------------------------------------------------
/// Two-dimension alignment, e.g. [`Align2::LEFT_TOP`].
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub struct Align2(pub [Align; 2]);
impl Align2 {
pub const LEFT_BOTTOM: Align2 = Align2([Align::Min, Align::Max]);
pub const LEFT_CENTER: Align2 = Align2([Align::Min, Align::Center]);
pub const LEFT_TOP: Align2 = Align2([Align::Min, Align::Min]);
pub const CENTER_BOTTOM: Align2 = Align2([Align::Center, Align::Max]);
pub const CENTER_CENTER: Align2 = Align2([Align::Center, Align::Center]);
pub const CENTER_TOP: Align2 = Align2([Align::Center, Align::Min]);
pub const RIGHT_BOTTOM: Align2 = Align2([Align::Max, Align::Max]);
pub const RIGHT_CENTER: Align2 = Align2([Align::Max, Align::Center]);
pub const RIGHT_TOP: Align2 = Align2([Align::Max, Align::Min]);
}
impl Align2 {
#[inline(always)]
pub fn x(self) -> Align {
self.0[0]
}
#[inline(always)]
pub fn y(self) -> Align {
self.0[1]
}
/// -1, 0, or +1 for each axis
pub fn to_sign(self) -> Vec2 {
vec2(self.x().to_sign(), self.y().to_sign())
}
/// Used e.g. to anchor a piece of text to a part of the rectangle.
/// Give a position within the rect, specified by the aligns
pub fn anchor_rect(self, rect: Rect) -> Rect {
let x = match self.x() {
Align::Min => rect.left(),
Align::Center => rect.left() - 0.5 * rect.width(),
Align::Max => rect.left() - rect.width(),
};
let y = match self.y() {
Align::Min => rect.top(),
Align::Center => rect.top() - 0.5 * rect.height(),
Align::Max => rect.top() - rect.height(),
};
Rect::from_min_size(pos2(x, y), rect.size())
}
/// e.g. center a size within a given frame
pub fn align_size_within_rect(self, size: Vec2, frame: Rect) -> Rect {
let x_range = self.x().align_size_within_range(size.x, frame.x_range());
let y_range = self.y().align_size_within_range(size.y, frame.y_range());
Rect::from_x_y_ranges(x_range, y_range)
}
pub fn pos_in_rect(self, frame: &Rect) -> Pos2 {
let x = match self.x() {
Align::Min => frame.left(),
Align::Center => frame.center().x,
Align::Max => frame.right(),
};
let y = match self.y() {
Align::Min => frame.top(),
Align::Center => frame.center().y,
Align::Max => frame.bottom(),
};
pos2(x, y)
}
}
pub fn center_size_in_rect(size: Vec2, frame: Rect) -> Rect {
Align2::CENTER_CENTER.align_size_within_rect(size, frame)
}