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use std::fmt::Display;
/// Rectangle.
#[derive(Debug, Clone, Copy)]
pub struct Rect {
/// X coordinate of the top-left corner.
pub x: f32,
/// Y coordinate of the top-left corner.
pub y: f32,
/// Width of the rectangle.
pub width: f32,
/// Height of the rectangle.
pub height: f32,
}
/// Rectangle position used for chaining constructors.
pub struct RectPosition {
pub x: f32,
pub y: f32,
}
impl RectPosition {
/// Makes a rectangle with the given size.
pub fn with_size(&self, width: f32, height: f32) -> Rect {
Rect {
x: self.x,
y: self.y,
width,
height,
}
}
/// Makes a rectangle with the given end point.
pub fn ending_at(&self, x: f32, y: f32) -> Rect {
Rect {
x: self.x,
y: self.y,
width: x - self.x,
height: y - self.y,
}
}
}
impl Rect {
/// Starts a rectangle with the given position.
pub fn at(x: f32, y: f32) -> RectPosition {
RectPosition { x, y }
}
/// Right end of the rectangle.
pub fn right(&self) -> f32 {
self.x + self.width
}
/// Bottom end of the rectangle.
pub fn bottom(&self) -> f32 {
self.y + self.height
}
/// Unites two rectangles.
///
/// # Arguments
///
/// * `other` - Other rectangle to unite with.
///
/// # Returns
///
/// * `Rect` - United rectangle.
pub fn union(&self, other: &Rect) -> Rect {
let left = self.x.min(other.x);
let right = self.right().max(other.right());
let top = self.y.min(other.y);
let bottom = self.bottom().max(other.bottom());
Rect {
x: left,
y: top,
width: right - left,
height: bottom - top,
}
}
/// Intersects two rectangles.
///
/// # Arguments
///
/// * `other` - Other rectangle to intersect with.
///
/// # Returns
///
/// * `Rect` - Intersected rectangle.
pub fn intersection(&self, other: &Rect) -> Rect {
let left = self.x.max(other.x);
let right = self.right().min(other.right());
let top = self.y.max(other.y);
let bottom = self.bottom().min(other.bottom());
Rect {
x: left,
y: top,
width: right - left,
height: bottom - top,
}
}
/// Clamps the rectangle to the given rect.
/// If the rectangle is larger than the given size, it will be shrunk.
///
/// # Arguments
///
/// * `width` - Width to clamp to.
/// * `height` - Height to clamp to.
pub fn clamp(&self, width: f32, height: f32) -> Rect {
let left = self.x.max(0.0);
let right = self.right().min(width);
let top = self.y.max(0.0);
let bottom = self.bottom().min(height);
Rect {
x: left,
y: top,
width: right - left,
height: bottom - top,
}
}
/// Calculates the intersection over union of two rectangles.
///
/// # Arguments
///
/// * `other` - Other rectangle to calculate the intersection over union with.
///
/// # Returns
///
/// * `f32` - Intersection over union.
pub fn iou(&self, other: &Rect) -> f32 {
let left = self.x.max(other.x);
let right = (self.right()).min(other.right());
let top = self.y.max(other.y);
let bottom = (self.bottom()).min(other.bottom());
let intersection = (right - left).max(0.0) * (bottom - top).max(0.0);
let area_self = self.width * self.height;
let area_other = other.width * other.height;
intersection / (area_self + area_other - intersection)
}
/// Calculates the intersection over union of two rectangles.
///
/// # Arguments
///
/// * `other` - Other rectangle to calculate the intersection over union with.
///
/// # Returns
///
/// * `f32` - Intersection over union.
pub fn iou_min(&self, other: &Rect) -> f32 {
let left = self.x.max(other.x);
let right = (self.right()).min(other.right());
let top = self.y.max(other.y);
let bottom = (self.bottom()).min(other.bottom());
let intersection = (right - left).max(0.0) * (bottom - top).max(0.0);
let area_self = self.width * self.height;
let area_other = other.width * other.height;
intersection / area_self.min(area_other)
}
/// Scales the rectangle.
pub fn scale(&self, x_scale: f32, y_scale: f32) -> Rect {
Rect {
x: self.x * x_scale,
y: self.y * y_scale,
width: self.width * x_scale,
height: self.height * y_scale,
}
}
/// Gets the rectangle as a tuple of (x, y, width, height).
pub fn to_xywh(&self) -> (f32, f32, f32, f32) {
(self.x, self.y, self.width, self.height)
}
}
impl Display for Rect {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{{x: {}, y: {}, width: {}, height: {}}}",
self.x, self.y, self.width, self.height
)
}
}