20 lines
588 B
Rust
20 lines
588 B
Rust
/// Radius of a concentric inset, in the same units as the outer radius.
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pub fn inner_radius(outer: f32, padding: f32) -> f32 {
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(outer - padding).max(0.0)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn inset_corners_preserve_the_center_and_saturate() {
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assert_eq!(inner_radius(14.0, 4.0), 10.0);
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assert_eq!(inner_radius(7.5, 2.25), 5.25);
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assert_eq!(inner_radius(14.0, 0.0), 14.0);
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assert_eq!(inner_radius(14.0, 14.0), 0.0);
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assert_eq!(inner_radius(14.0, 20.0), 0.0);
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assert_eq!(inner_radius(0.0, 4.0), 0.0);
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}
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}
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