| 208 | //----------------------------------------------------------------------- |
| 209 | template<class VC> |
| 210 | void math_stroke<VC>::calc_miter(VC& vc, |
| 211 | const vertex_dist& v0, |
| 212 | const vertex_dist& v1, |
| 213 | const vertex_dist& v2, |
| 214 | double dx1, double dy1, |
| 215 | double dx2, double dy2, |
| 216 | line_join_e lj, |
| 217 | double mlimit, |
| 218 | double dbevel) |
| 219 | { |
| 220 | double xi = v1.x; |
| 221 | double yi = v1.y; |
| 222 | double di = 1; |
| 223 | double lim = m_width_abs * mlimit; |
| 224 | bool miter_limit_exceeded = true; // Assume the worst |
| 225 | bool intersection_failed = true; // Assume the worst |
| 226 | |
| 227 | if(calc_intersection(v0.x + dx1, v0.y - dy1, |
| 228 | v1.x + dx1, v1.y - dy1, |
| 229 | v1.x + dx2, v1.y - dy2, |
| 230 | v2.x + dx2, v2.y - dy2, |
| 231 | &xi, &yi)) |
| 232 | { |
| 233 | // Calculation of the intersection succeeded |
| 234 | //--------------------- |
| 235 | di = calc_distance(v1.x, v1.y, xi, yi); |
| 236 | if(di <= lim) |
| 237 | { |
| 238 | // Inside the miter limit |
| 239 | //--------------------- |
| 240 | add_vertex(vc, xi, yi); |
| 241 | miter_limit_exceeded = false; |
| 242 | } |
| 243 | intersection_failed = false; |
| 244 | } |
| 245 | else |
| 246 | { |
| 247 | // Calculation of the intersection failed, most probably |
| 248 | // the three points lie one straight line. |
| 249 | // First check if v0 and v2 lie on the opposite sides of vector: |
| 250 | // (v1.x, v1.y) -> (v1.x+dx1, v1.y-dy1), that is, the perpendicular |
| 251 | // to the line determined by vertices v0 and v1. |
| 252 | // This condition determines whether the next line segments continues |
| 253 | // the previous one or goes back. |
| 254 | //---------------- |
| 255 | double x2 = v1.x + dx1; |
| 256 | double y2 = v1.y - dy1; |
| 257 | if((cross_product(v0.x, v0.y, v1.x, v1.y, x2, y2) < 0.0) == |
| 258 | (cross_product(v1.x, v1.y, v2.x, v2.y, x2, y2) < 0.0)) |
| 259 | { |
| 260 | // This case means that the next segment continues |
| 261 | // the previous one (straight line) |
| 262 | //----------------- |
| 263 | add_vertex(vc, v1.x + dx1, v1.y - dy1); |
| 264 | miter_limit_exceeded = false; |
| 265 | } |
| 266 | } |
| 267 |
nothing calls this directly
no test coverage detected