Function firework_rs::utils::gen_points_fan

source · 
pub fn gen_points_fan(
    radius: f32,
    n: usize,
    st_angle: f32,
    ed_angle: f32
) -> Vec<Vec2>
Expand description

Generate random Vec2 within a fan-shape range

Examples found in repository?
examples/fountain.rs (lines 75-80)
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fn gen_fountain_firework(center: Vec2) -> Firework {
    let colors = vec![(226, 196, 136), (255, 245, 253), (208, 58, 99)];
    let mut particles = Vec::new();
    for v in gen_points_fan(
        300.,
        45,
        5 as f32 / 12 as f32 * PI,
        7 as f32 / 12 as f32 * PI,
    )
    .iter()
    {
        particles.push(ParticleConfig::new(
            center,
            *v,
            thread_rng().gen_range(28..38),
            Duration::from_secs_f32(thread_rng().gen_range(2.5..3.8)),
            *colors.iter().choose(&mut thread_rng()).unwrap(),
        ));
    }
    let mut config = FireworkConfig::default()
        .with_ar_scale(0.15)
        .with_gravity_scale(0.5)
        .with_gradient_scale(gradient);
    config.set_enable_gradient(true);
    Firework {
        init_time: SystemTime::now(),
        spawn_after: Duration::ZERO,
        center,
        particles,
        config,
        form: ExplosionForm::Sustained {
            lasts: Duration::from_secs(5),
            time_interval: Duration::from_secs_f32(0.08),
            timer: Duration::ZERO,
        },
        ..Default::default()
    }
}
More examples
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examples/heart.rs (line 83)
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fn gen_heart_firework(center: Vec2) -> Firework {
    let colors = vec![
        (233, 232, 237),
        (254, 142, 130),
        (200, 27, 72),
        (86, 18, 31),
    ];
    let mut particles = Vec::new();
    let trail_length = thread_rng().gen_range(100..105);
    let life_time = Duration::from_secs_f32(thread_rng().gen_range(3.0..3.2));
    let init_pos = center - Vec2::NEG_Y * 15.;
    for v in gen_points_fan(300., 45, 0.2 * PI, 0.3 * PI).iter() {
        particles.push(ParticleConfig::new(
            init_pos,
            *v,
            trail_length,
            life_time,
            *colors.iter().choose(&mut thread_rng()).unwrap(),
        ));
    }
    for v in gen_points_fan(300., 45, 0.7 * PI, 0.8 * PI).iter() {
        particles.push(ParticleConfig::new(
            init_pos,
            *v,
            trail_length,
            life_time,
            *colors.iter().choose(&mut thread_rng()).unwrap(),
        ));
    }
    let mut config = FireworkConfig::default()
        .with_ar_scale(0.1)
        .with_gravity_scale(0.1)
        .with_gradient_scale(gradient)
        .with_additional_force(move |particle| (center - particle.pos) * 2.);
    config.set_enable_gradient(true);
    Firework {
        init_time: SystemTime::now(),
        spawn_after: Duration::ZERO,
        center,
        particles,
        config,
        form: ExplosionForm::Instant { used: false },
        ..Default::default()
    }
}