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Simplify centering math, don't crash if the rectangle clips

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Also, tests
This commit is contained in:
John Doty 2023-03-21 23:07:08 -07:00
parent 290dcff9b6
commit 34340e2575
1 changed files with 43 additions and 28 deletions
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71
src/client/ui.rs
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@ -582,36 +582,24 @@ impl Drop for UI {
/// helper function to create a centered rect using up certain percentage of the available rect `r`
fn centered_rect(width_chars: u16, height_chars: u16, r: Rect) -> Rect {
let height_percent =
(height_chars as f64 / r.height as f64 * 100.0).ceil() as u16;
let height_diff = (100 - height_percent) / 2;
let popup_layout = Layout::default()
.direction(Direction::Vertical)
.constraints(
[
Constraint::Percentage(height_diff),
Constraint::Percentage(height_percent),
Constraint::Percentage(height_diff),
]
.as_ref(),
)
.split(r);
let left = r.left()
+ if width_chars > r.width {
0
} else {
(r.width - width_chars) / 2
};
let width_percent =
(width_chars as f64 / r.width as f64 * 100.0).ceil() as u16;
let width_diff = (100 - width_percent) / 2;
let top = r.top()
+ if height_chars > r.height {
0
} else {
(r.height - height_chars) / 2
};
Layout::default()
.direction(Direction::Horizontal)
.constraints(
[
Constraint::Percentage(width_diff),
Constraint::Percentage(width_percent),
Constraint::Percentage(width_diff),
]
.as_ref(),
)
.split(popup_layout[1])[1]
let width = width_chars.min(r.width);
let height = height_chars.min(r.height);
Rect::new(left, top, width, height)
}
#[cfg(test)]
@ -777,4 +765,31 @@ mod tests {
drop(sender);
}
#[test]
fn test_centered_rect() {
// Normal old centering.
let frame = Rect::new(0, 0, 128, 128);
let centered = centered_rect(10, 10, frame);
assert_eq!(centered.left(), (128 - centered.width) / 2);
assert_eq!(centered.top(), (128 - centered.height) / 2);
assert_eq!(centered.width, 10);
assert_eq!(centered.height, 10);
// Clip the width and height to the box
let frame = Rect::new(0, 0, 5, 5);
let centered = centered_rect(10, 10, frame);
assert_eq!(centered.left(), 0);
assert_eq!(centered.top(), 0);
assert_eq!(centered.width, 5);
assert_eq!(centered.height, 5);
// Deal with non zero-zero origins.
let frame = Rect::new(10, 10, 128, 128);
let centered = centered_rect(10, 10, frame);
assert_eq!(centered.left(), 10 + (128 - centered.width) / 2);
assert_eq!(centered.top(), 10 + (128 - centered.height) / 2);
assert_eq!(centered.width, 10);
assert_eq!(centered.height, 10);
}
}