25 lines
984 B
Rust
25 lines
984 B
Rust
extern crate nalgebra as na;
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use na::{Isometry2, Similarity2, Vector2};
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use std::f32::consts;
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fn main() {
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// Isometry -> Similarity conversion always succeeds.
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let iso = Isometry2::new(Vector2::new(1.0f32, 2.0), na::zero());
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let _: Similarity2<f32> = na::convert(iso);
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// Similarity -> Isometry conversion fails if the scaling factor is not 1.0.
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let sim_without_scaling = Similarity2::new(Vector2::new(1.0f32, 2.0), consts::PI, 1.0);
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let sim_with_scaling = Similarity2::new(Vector2::new(1.0f32, 2.0), consts::PI, 2.0);
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let iso_success: Option<Isometry2<f32>> = na::try_convert(sim_without_scaling);
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let iso_fail: Option<Isometry2<f32>> = na::try_convert(sim_with_scaling);
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assert!(iso_success.is_some());
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assert!(iso_fail.is_none());
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// Similarity -> Isometry conversion can be forced at your own risks.
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let iso_forced: Isometry2<f32> = na::convert_unchecked(sim_with_scaling);
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assert_eq!(iso_success.unwrap(), iso_forced);
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}
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