| 379 | //--------------------------------------------------------stroke_calc_cap |
| 380 | template <class VC> |
| 381 | void math_stroke<VC>::calc_cap( |
| 382 | VC& vc, const vertex_dist& v0, const vertex_dist& v1, double len) |
| 383 | { |
| 384 | vc.remove_all(); |
| 385 | |
| 386 | double dx1 = (v1.y - v0.y) / len; |
| 387 | double dy1 = (v1.x - v0.x) / len; |
| 388 | double dx2 = 0; |
| 389 | double dy2 = 0; |
| 390 | |
| 391 | dx1 *= m_width; |
| 392 | dy1 *= m_width; |
| 393 | |
| 394 | if (m_line_cap != round_cap) |
| 395 | { |
| 396 | if (m_line_cap == square_cap) |
| 397 | { |
| 398 | dx2 = dy1 * m_width_sign; |
| 399 | dy2 = dx1 * m_width_sign; |
| 400 | } |
| 401 | add_vertex(vc, v0.x - dx1 - dx2, v0.y + dy1 - dy2); |
| 402 | add_vertex(vc, v0.x + dx1 - dx2, v0.y - dy1 - dy2); |
| 403 | } |
| 404 | else |
| 405 | { |
| 406 | double da = std::acos(m_width_abs / |
| 407 | (m_width_abs + 0.125 / m_approx_scale)) * |
| 408 | 2; |
| 409 | double a1; |
| 410 | int i; |
| 411 | int n = int(pi / da); |
| 412 | |
| 413 | da = pi / (n + 1); |
| 414 | add_vertex(vc, v0.x - dx1, v0.y + dy1); |
| 415 | if (m_width_sign > 0) |
| 416 | { |
| 417 | a1 = std::atan2(dy1, -dx1); |
| 418 | a1 += da; |
| 419 | for (i = 0; i < n; i++) |
| 420 | { |
| 421 | add_vertex(vc, |
| 422 | v0.x + std::cos(a1) * m_width, |
| 423 | v0.y + std::sin(a1) * m_width); |
| 424 | a1 += da; |
| 425 | } |
| 426 | } |
| 427 | else |
| 428 | { |
| 429 | a1 = std::atan2(-dy1, dx1); |
| 430 | a1 -= da; |
| 431 | for (i = 0; i < n; i++) |
| 432 | { |
| 433 | add_vertex(vc, |
| 434 | v0.x + std::cos(a1) * m_width, |
| 435 | v0.y + std::sin(a1) * m_width); |
| 436 | a1 -= da; |
| 437 | } |
| 438 | } |