37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
extern crate nalgebra_glm as glm;
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use std::f64::consts::PI;
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pub struct Heading {
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pub x : f32,
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pub z : f32,
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pub roll : f32, // measured in radians
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pub pitch : f32, // measured in radians
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pub yaw : f32, // measured in radians
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}
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pub fn simple_heading_animation(time: f32) -> Heading {
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let t = time as f64;
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let step = 0.05f64;
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let path_size = 15f64;
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let circuit_speed = 0.8f64;
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let xpos = path_size * (2.0 * (t+ 0.0) * circuit_speed).sin();
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let xpos_next = path_size * (2.0 * (t+step) * circuit_speed).sin();
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let zpos = 3.0 * path_size * ((t+ 0.0) * circuit_speed).cos();
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let zpos_next = 3.0 * path_size * ((t+step) * circuit_speed).cos();
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let delta_pos = glm::vec2(xpos_next - xpos, zpos_next - zpos);
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let roll = (t * circuit_speed).cos() * 0.5;
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let pitch = -0.175 * glm::length(&delta_pos);
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let yaw = PI + delta_pos.x.atan2(delta_pos.y);
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Heading {
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x : xpos as f32,
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z : zpos as f32,
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roll : roll as f32,
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pitch : pitch as f32,
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yaw : yaw as f32,
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}
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}
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