| 266 | static const int WEAR_TICKS = 806400; |
| 267 | |
| 268 | static bool apply_impact_damage(df::item *item, int minv, int maxv) |
| 269 | { |
| 270 | MaterialInfo info(item); |
| 271 | if (!info.isValid()) |
| 272 | { |
| 273 | item->setWear(3); |
| 274 | return false; |
| 275 | } |
| 276 | |
| 277 | auto &strength = info.material->strength; |
| 278 | |
| 279 | // Use random strain type excluding COMPRESSIVE (conveniently last) |
| 280 | int type = rng.random(strain_type::COMPRESSIVE); |
| 281 | int power = minv + rng.random(maxv-minv+1); |
| 282 | |
| 283 | // High elasticity materials just bend |
| 284 | if (strength.strain_at_yield[type] >= 5000) |
| 285 | return true; |
| 286 | |
| 287 | // Instant fracture? |
| 288 | int fracture = strength.fracture[type]; |
| 289 | if (fracture <= power || info.material->flags.is_set(material_flags::IS_GLASS)) |
| 290 | { |
| 291 | item->setWear(3); |
| 292 | return false; |
| 293 | } |
| 294 | |
| 295 | // Impact within elastic strain range? |
| 296 | int yield = strength.yield[type]; |
| 297 | if (yield > power) |
| 298 | return true; |
| 299 | |
| 300 | // Can wear? |
| 301 | auto actual = virtual_cast<df::item_actual>(item); |
| 302 | if (!actual) |
| 303 | return false; |
| 304 | |
| 305 | // Transform plastic deformation to wear |
| 306 | int max_wear = WEAR_TICKS * 4; |
| 307 | int cur_wear = WEAR_TICKS * actual->wear + actual->wear_timer; |
| 308 | cur_wear += int64_t(power - yield)*max_wear/(fracture - yield); |
| 309 | |
| 310 | if (cur_wear >= max_wear) |
| 311 | { |
| 312 | actual->wear = 3; |
| 313 | return false; |
| 314 | } |
| 315 | else |
| 316 | { |
| 317 | actual->wear = cur_wear / WEAR_TICKS; |
| 318 | actual->wear_timer = cur_wear % WEAR_TICKS; |
| 319 | return true; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Configuration object |
no test coverage detected