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|
use crate::Rectangle;
/// A fixed reference line for the measurement of coordinates.
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
pub enum Axis {
/// The horizontal axis: —
Horizontal,
/// The vertical axis: |
Vertical,
}
impl Axis {
pub(super) fn split(
&self,
rectangle: &Rectangle,
ratio: f32,
spacing: f32,
) -> (Rectangle, Rectangle) {
match self {
Axis::Horizontal => {
let height_top =
(rectangle.height * ratio - spacing / 2.0).round();
let height_bottom = rectangle.height - height_top - spacing;
(
Rectangle {
height: height_top,
..*rectangle
},
Rectangle {
y: rectangle.y + height_top + spacing,
height: height_bottom,
..*rectangle
},
)
}
Axis::Vertical => {
let width_left =
(rectangle.width * ratio - spacing / 2.0).round();
let width_right = rectangle.width - width_left - spacing;
(
Rectangle {
width: width_left,
..*rectangle
},
Rectangle {
x: rectangle.x + width_left + spacing,
width: width_right,
..*rectangle
},
)
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn split_horizontal() {
let a = Axis::Horizontal;
// rectangle height, spacing, top height, bottom y, bottom height
let cases = vec![
// Even height, even spacing
(10.0, 2.0, 4.0, 6.0, 4.0),
// Odd height, even spacing
(9.0, 2.0, 4.0, 6.0, 3.0),
// Even height, odd spacing
(10.0, 1.0, 5.0, 6.0, 4.0),
// Odd height, odd spacing
(9.0, 1.0, 4.0, 5.0, 4.0),
];
for case in cases {
let (h0, spacing, h1_top, y_bottom, h1_bottom) = case;
let r = Rectangle {
x: 0.0,
y: 0.0,
width: 10.0,
height: h0,
};
let (top, bottom) = a.split(&r, 0.5, spacing);
assert_eq!(
top,
Rectangle {
height: h1_top,
..r
}
);
assert_eq!(
bottom,
Rectangle {
y: y_bottom,
height: h1_bottom,
..r
}
);
}
}
#[test]
fn split_vertical() {
let a = Axis::Vertical;
// rectangle width, spacing, left width, right x, right width
let cases = vec![
// Even width, even spacing
(10.0, 2.0, 4.0, 6.0, 4.0),
// Odd width, even spacing
(9.0, 2.0, 4.0, 6.0, 3.0),
// Even width, odd spacing
(10.0, 1.0, 5.0, 6.0, 4.0),
// Odd width, odd spacing
(9.0, 1.0, 4.0, 5.0, 4.0),
];
for case in cases {
let (w0, spacing, w1_left, x_right, w1_right) = case;
let r = Rectangle {
x: 0.0,
y: 0.0,
width: w0,
height: 10.0,
};
let (left, right) = a.split(&r, 0.5, spacing);
assert_eq!(
left,
Rectangle {
width: w1_left,
..r
}
);
assert_eq!(
right,
Rectangle {
x: x_right,
width: w1_right,
..r
}
);
}
}
}
|
