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feat: improve tractor beam visual with 2-layer glow and pulse animation

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Replace the single static rectangle with a 2-layer beam (outer glow +
inner core) and sinusoidal opacity pulse. Add per-frame beam height
tracking to follow boss position. Include 8 unit tests for pure math
functions (beam height calculation, pulse alpha).

Refs: GAL-33
This commit is contained in:
Harald Hoyer 2026-05-06 19:35:16 +02:00
parent db061820b9
commit 52b0919d3f
4 changed files with 375 additions and 162 deletions
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6
src/constants.rs
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@ -39,6 +39,12 @@ pub const TRACTOR_BEAM_WIDTH: f32 = 20.0;
pub const TRACTOR_BEAM_DURATION: f32 = 3.0;
pub const TRACTOR_BEAM_COLOR: Color = Color::rgba(0.5, 0.0, 0.8, 0.6);
pub const CAPTURE_DURATION: f32 = 10.0; // How long the player stays captured
// Tractor beam visual constants
pub const BEAM_GLOW_WIDTH: f32 = 40.0;
pub const BEAM_GLOW_COLOR: Color = Color::rgba(0.3, 0.0, 0.5, 0.25);
pub const BEAM_CORE_COLOR: Color = Color::rgba(0.7, 0.2, 1.0, 0.7);
pub const BEAM_PULSE_FREQ: f32 = 3.0;
pub const BEAM_PULSE_AMPLITUDE: f32 = 0.15;
// Starfield constants
pub const STAR_COUNT: usize = 150;