Scatter missed arrows instead of landing on a ring around towers

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/particles.rs

@@ -332,12 +332,16 @@ impl Game {
                 let spot = if f.style == ST_ARROW_FALL {
                     // spent at the end of its range: it sails on a little and comes down there
                     // (a wall in the way stops it in front of the wall)
-                    let reach = 0.35 + f.h2.max(0.0) * 1.5;
-                    let (fx, fy) = (x + dx * reach, y + dy * reach);
+                    // where exactly varies: a little further or shorter, and off to the side
+                    let reach = 0.2 + f.h2.max(0.0) * 1.5 + self.vrng.f() * 1.4;
+                    let side = (self.vrng.f() - 0.5) * 0.9;
+                    let (fx, fy) = (x + dx * reach - dy * side, y + dy * reach + dx * side);
                     if self.map.get(fx as i32, fy as i32).map_or(true, |t| t.solid()) { (x, y) } else { (fx, fy) }
                 } else if self.vrng.f() < 0.35 {
                     // a hit that glanced off: it comes down next to the target
-                    (x + self.vrng.f() * 0.7 - 0.35, y + self.vrng.f() * 0.7 - 0.35)
+                    // (mostly on, a bit past the target)
+                    let on = 0.1 + self.vrng.f() * 0.8;
+                    (x + dx * on + self.vrng.f() * 1.0 - 0.5, y + dy * on + self.vrng.f() * 1.0 - 0.5)
                 } else {
                     return; // a hit: the arrow stays in the target
                 };
@@ -493,10 +497,13 @@ mod tests {
     // a little lava and water east of the core
     fn river_spot(g: &mut Game, kind: Kind) -> (f32, f32) {
         let (cx, cy) = g.map.core;
-        let (x, y) = (cx + 3, cy - 3);
-        let t = &mut g.map.t[idx(x, y)];
-        t.kind = kind;
-        t.owner = Owner::None;
+        let (x, y) = (cx + 4, cy - 4);
+        // a 3x3 patch around (x, y)
+        for (dx, dy) in [(-1, -1), (0, -1), (1, -1), (-1, 0), (0, 0), (1, 0), (-1, 1), (0, 1), (1, 1)] {
+            let t = &mut g.map.t[idx(x + dx, y + dy)];
+            t.kind = kind;
+            t.owner = Owner::None;
+        }
         (x as f32 + 0.5, y as f32 + 0.5)
     }
 
@@ -505,7 +512,7 @@ mod tests {
         let mut g = Game::new(3, 64, 64);
         let (lx, ly) = river_spot(&mut g, Kind::Lava);
         // a spent tower arrow comes down in the lava: it drifts there, burning, then is gone
-        g.shot(lx - 2.0, ly, 0.5, lx - 0.4, ly, 0.0, 0.3, 0xffffffff);
+        g.shot(lx - 2.0, ly, 0.5, lx - 1.2, ly, 0.0, 0.3, 0xffffffff);
         g.style_last_fx(ST_ARROW_FALL);
         for _ in 0..8 {
             g.update(0.05);