| 315 | //--------------------------------------------------------stroke_calc_cap |
| 316 | template<class VC> |
| 317 | void math_stroke<VC>::calc_cap(VC& vc, |
| 318 | const vertex_dist& v0, |
| 319 | const vertex_dist& v1, |
| 320 | double len) |
| 321 | { |
| 322 | vc.remove_all(); |
| 323 | |
| 324 | double dx1 = (v1.y - v0.y) / len; |
| 325 | double dy1 = (v1.x - v0.x) / len; |
| 326 | double dx2 = 0; |
| 327 | double dy2 = 0; |
| 328 | |
| 329 | dx1 *= m_width; |
| 330 | dy1 *= m_width; |
| 331 | |
| 332 | if(m_line_cap != round_cap) |
| 333 | { |
| 334 | if(m_line_cap == square_cap) |
| 335 | { |
| 336 | dx2 = dy1 * m_width_sign; |
| 337 | dy2 = dx1 * m_width_sign; |
| 338 | } |
| 339 | add_vertex(vc, v0.x - dx1 - dx2, v0.y + dy1 - dy2); |
| 340 | add_vertex(vc, v0.x + dx1 - dx2, v0.y - dy1 - dy2); |
| 341 | } |
| 342 | else |
| 343 | { |
| 344 | double da = acos(m_width_abs / (m_width_abs + 0.125 / m_approx_scale)) * 2; |
| 345 | double a1; |
| 346 | int i; |
| 347 | int n = int(pi / da); |
| 348 | |
| 349 | da = pi / (n + 1); |
| 350 | add_vertex(vc, v0.x - dx1, v0.y + dy1); |
| 351 | if(m_width_sign > 0) |
| 352 | { |
| 353 | a1 = atan2(dy1, -dx1); |
| 354 | a1 += da; |
| 355 | for(i = 0; i < n; i++) |
| 356 | { |
| 357 | add_vertex(vc, v0.x + cos(a1) * m_width, |
| 358 | v0.y + sin(a1) * m_width); |
| 359 | a1 += da; |
| 360 | } |
| 361 | } |
| 362 | else |
| 363 | { |
| 364 | a1 = atan2(-dy1, dx1); |
| 365 | a1 -= da; |
| 366 | for(i = 0; i < n; i++) |
| 367 | { |
| 368 | add_vertex(vc, v0.x + cos(a1) * m_width, |
| 369 | v0.y + sin(a1) * m_width); |
| 370 | a1 -= da; |
| 371 | } |
| 372 | } |
| 373 | add_vertex(vc, v0.x + dx1, v0.y - dy1); |
| 374 | } |