| 319 | } |
| 320 | |
| 321 | fn color_index(&self, char_index: usize, scanner: ScannerState) -> Option<usize> { |
| 322 | let directional_distance = if scanner.is_moving_forward { |
| 323 | scanner.active_position as i32 - char_index as i32 |
| 324 | } else { |
| 325 | char_index as i32 - scanner.active_position as i32 |
| 326 | }; |
| 327 | |
| 328 | if scanner.is_holding { |
| 329 | let index = directional_distance + scanner.hold_progress as i32; |
| 330 | return usize::try_from(index) |
| 331 | .ok() |
| 332 | .filter(|idx| *idx < self.trail_colors.len()); |
| 333 | } |
| 334 | |
| 335 | if directional_distance == 0 { |
| 336 | return Some(0); |
| 337 | } |
| 338 | |
| 339 | usize::try_from(directional_distance) |
| 340 | .ok() |
| 341 | .filter(|idx| *idx < self.trail_colors.len()) |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | impl Default for KnightRiderSpinner { |