| 1 | // pathfinder/geometry/src/util.rs |
| 2 | // |
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| 3 | // Copyright © 2019 The Pathfinder Project Developers. |
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| 4 | // |
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| 5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
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| 6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
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| 7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
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| 8 | // option. This file may not be copied, modified, or distributed |
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| 9 | // except according to those terms. |
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| 10 | |
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| 11 | //! Various utilities. |
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| 12 | |
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| 13 | use std::f32; |
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| 14 | |
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| 15 | pub const EPSILON: f32 = 0.001; |
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| 16 | |
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| 17 | /// Approximate equality. |
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| 18 | #[inline ] |
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| 19 | pub fn approx_eq(a: f32, b: f32) -> bool { |
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| 20 | f32::abs(self:a - b) <= EPSILON |
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| 21 | } |
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| 22 | |
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| 23 | /// Linear interpolation. |
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| 24 | #[inline ] |
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| 25 | pub fn lerp(a: f32, b: f32, t: f32) -> f32 { |
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| 26 | a + (b - a) * t |
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| 27 | } |
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| 28 | |
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| 29 | /// Clamping. |
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| 30 | #[inline ] |
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| 31 | pub fn clamp(x: f32, min_val: f32, max_val: f32) -> f32 { |
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| 32 | f32::min(self:max_val, other:f32::max(self:min_val, other:x)) |
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| 33 | } |
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| 34 | |
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| 35 | /// Divides `a` by `b`, rounding up. |
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| 36 | #[inline ] |
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| 37 | pub fn alignup_i32(a: i32, b: i32) -> i32 { |
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| 38 | (a + b - 1) / b |
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| 39 | } |
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| 40 | |
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