noteuclid/gear-teeth
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add variable speed

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This commit is contained in:
numzero 2026-09-23 20:04:20 +03:00
parent cc11715d78
commit 96e7725857
1 changed files with 21 additions and 17 deletions
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38
src/main.rs
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@ -93,16 +93,6 @@ fn main() {
const R_SKY: f32 = R_SCALE * N_TEETH_SKY as f32; const R_SKY: f32 = R_SCALE * N_TEETH_SKY as f32;
const FPS: f32 = 60.0; const FPS: f32 = 60.0;
const V_SUN: f32 = 2.0;
const V_SKY: f32 = -1.0;
const V_SAT: f32 = (V_SKY - V_SUN) / 2.0;
const V_ORBIT: f32 = (V_SUN + V_SKY) / 2.0;
const W_SUN: f32 = V_SUN / N_TEETH_SUN as f32;
const W_SKY: f32 = V_SKY / N_TEETH_SKY as f32;
const W_SAT: f32 = V_SAT / N_TEETH_SAT as f32;
const W_ORBIT: f32 = V_ORBIT / (N_TEETH_SUN + N_TEETH_SAT) as f32;
with_2d_graphics(|| { with_2d_graphics(|| {
let sun = gear_shape(N_TEETH_SUN); let sun = gear_shape(N_TEETH_SUN);
@ -110,21 +100,24 @@ fn main() {
let crown = gear_shape_outer(N_TEETH_SKY); let crown = gear_shape_outer(N_TEETH_SKY);
let (canvas, mut events) = create_drawing_window_with_events("Canvas window"); let (canvas, mut events) = create_drawing_window_with_events("Canvas window");
let mut frame = 0; let mut t = 0.0f32;
let mut angle_sun = 1.0 / N_TEETH_SUN as f32 * PI;
let mut angle_sky = 0.0;
let mut angle_sat = 0.0;
let mut angle_orbit = 0.0;
'main: loop { 'main: loop {
while let Poll::Ready(event) = while let Poll::Ready(event) =
events.poll_next_unpin(&mut Context::from_waker(Waker::noop())) events.poll_next_unpin(&mut Context::from_waker(Waker::noop()))
{ {
let Some(_event) = event else { break 'main }; let Some(_event) = event else { break 'main };
} }
let t = frame as f32 / FPS;
canvas.draw(|gc| { canvas.draw(|gc| {
gc.clear_canvas(Rgba(0.1, 0.1, 0.1, 1.0)); gc.clear_canvas(Rgba(0.1, 0.1, 0.1, 1.0));
gc.canvas_height(100.0); gc.canvas_height(100.0);
gc.line_width(0.25); gc.line_width(0.25);
let m = Mat2::from_angle(t * W_SUN + 1.0 / N_TEETH_SUN as f32 * PI); let m = Mat2::from_angle(angle_sun);
gc.new_path(); gc.new_path();
for pt in &sun { for pt in &sun {
let pt = R_SUN * m * pt; let pt = R_SUN * m * pt;
@ -134,9 +127,9 @@ fn main() {
gc.stroke_color(Rgba(0.8, 0.7, 0.1, 1.0)); gc.stroke_color(Rgba(0.8, 0.7, 0.1, 1.0));
gc.stroke(); gc.stroke();
let mr = Mat2::from_angle(t * W_SAT); let mr = Mat2::from_angle(angle_sat);
for k in 0..N_SAT { for k in 0..N_SAT {
let mo = Mat2::from_angle(t * W_ORBIT + k as f32 / N_SAT as f32 * 2. * PI); let mo = Mat2::from_angle(angle_orbit + k as f32 / N_SAT as f32 * 2. * PI);
gc.new_path(); gc.new_path();
for pt in &sat { for pt in &sat {
let pt = mo * vec2(OFF_SAT, 0.) + R_SAT * mr * pt; let pt = mo * vec2(OFF_SAT, 0.) + R_SAT * mr * pt;
@ -147,7 +140,7 @@ fn main() {
gc.stroke(); gc.stroke();
} }
let m = Mat2::from_angle(t * W_SKY); let m = Mat2::from_angle(angle_sky);
gc.new_path(); gc.new_path();
for pt in &crown { for pt in &crown {
let pt = R_SKY * m * pt; let pt = R_SKY * m * pt;
@ -157,7 +150,18 @@ fn main() {
gc.stroke_color(Rgba(0.1, 0.4, 0.8, 1.0)); gc.stroke_color(Rgba(0.1, 0.4, 0.8, 1.0));
gc.stroke(); gc.stroke();
}); });
frame += 1;
let v_sun: f32 = 1.0 + 2.0 * (0.007 * t).sin();
let v_sky: f32 = 1.0 - 2.0 * (0.003 * t).cos();
let v_sat: f32 = (v_sky - v_sun) / 2.0;
let v_orbit: f32 = (v_sun + v_sky) / 2.0;
let dt = 1.0 / FPS;
t += dt;
angle_sun += dt * v_sun / N_TEETH_SUN as f32;
angle_sky += dt * v_sky / N_TEETH_SKY as f32;
angle_sat += dt * v_sat / N_TEETH_SAT as f32;
angle_orbit += dt * v_orbit / (N_TEETH_SUN + N_TEETH_SAT) as f32;
} }
}); });
} }