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Fine-tune Radians::to_distance

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An angle of 0 radians will "point" to the top-center of a `Rectangle` and
then increase clockwise.
This commit is contained in:
Héctor Ramón Jiménez 2023-09-08 02:36:17 +02:00
parent d2294737c2
commit 90cbab18b9
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GPG key ID: 140CC052C94F138E
1 changed files with 8 additions and 7 deletions
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15
core/src/angle.rs
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@ -1,6 +1,6 @@
use crate::{Point, Rectangle, Vector}; use crate::{Point, Rectangle, Vector};
use std::f32::consts::PI; use std::f32::consts::{FRAC_PI_2, PI};
use std::ops::RangeInclusive; use std::ops::RangeInclusive;
/// Degrees /// Degrees
@ -57,15 +57,16 @@ impl num_traits::FromPrimitive for Radians {
impl Radians { impl Radians {
/// Calculates the line in which the [`Angle`] intercepts the `bounds`. /// Calculates the line in which the [`Angle`] intercepts the `bounds`.
pub fn to_distance(&self, bounds: &Rectangle) -> (Point, Point) { pub fn to_distance(&self, bounds: &Rectangle) -> (Point, Point) {
let v1 = Vector::new(f32::cos(self.0), f32::sin(self.0)); let angle = self.0 - FRAC_PI_2;
let r = Vector::new(f32::cos(angle), f32::sin(angle));
let distance_to_rect = f32::min( let distance_to_rect = f32::max(
f32::abs((bounds.y - bounds.center().y) / v1.y), f32::abs(r.x * bounds.width / 2.0),
f32::abs(((bounds.x + bounds.width) - bounds.center().x) / v1.x), f32::abs(r.y * bounds.height / 2.0),
); );
let start = bounds.center() + v1 * distance_to_rect; let start = bounds.center() - r * distance_to_rect;
let end = bounds.center() - v1 * distance_to_rect; let end = bounds.center() + r * distance_to_rect;
(start, end) (start, end)
} }