//////////////////////////////////////////////////// PIP1: This is the current Clipper2 PointInPolygon code ////////////////////////////////////////////////////
| 42 | // PIP1: This is the current Clipper2 PointInPolygon code |
| 43 | ///////////////////////////////////////////////////////// |
| 44 | inline PointInPolygonResult PIP1(const Point64& pt, const Path64& polygon) |
| 45 | { |
| 46 | int val = 0; |
| 47 | typename Path64::const_iterator cbegin = polygon.cbegin(), first = cbegin, curr, prev; |
| 48 | typename Path64::const_iterator cend = polygon.cend(); |
| 49 | |
| 50 | while (first != cend && first->y == pt.y) ++first; |
| 51 | if (first == cend) // not a proper polygon |
| 52 | return PointInPolygonResult::IsOutside; |
| 53 | |
| 54 | bool is_above = first->y < pt.y, starting_above = is_above; |
| 55 | curr = first + 1; |
| 56 | while (true) |
| 57 | { |
| 58 | if (curr == cend) |
| 59 | { |
| 60 | if (cend == first || first == cbegin) break; |
| 61 | cend = first; |
| 62 | curr = cbegin; |
| 63 | } |
| 64 | |
| 65 | if (is_above) |
| 66 | { |
| 67 | while (curr != cend && curr->y < pt.y) ++curr; |
| 68 | if (curr == cend) continue; |
| 69 | } |
| 70 | else |
| 71 | { |
| 72 | while (curr != cend && curr->y > pt.y) ++curr; |
| 73 | if (curr == cend) continue; |
| 74 | } |
| 75 | |
| 76 | if (curr == cbegin) |
| 77 | prev = polygon.cend() - 1; |
| 78 | else |
| 79 | prev = curr - 1; |
| 80 | |
| 81 | if (curr->y == pt.y) |
| 82 | { |
| 83 | if (curr->x == pt.x || |
| 84 | (curr->y == prev->y && |
| 85 | ((pt.x < prev->x) != (pt.x < curr->x)))) |
| 86 | return PointInPolygonResult::IsOn; |
| 87 | ++curr; |
| 88 | if (curr == first) break; |
| 89 | continue; |
| 90 | } |
| 91 | |
| 92 | if (pt.x < curr->x && pt.x < prev->x) |
| 93 | { |
| 94 | // we're only interested in edges crossing on the left |
| 95 | } |
| 96 | else if (pt.x > prev->x && pt.x > curr->x) |
| 97 | val = 1 - val; // toggle val |
| 98 | else |
| 99 | { |
| 100 | double d = CrossProduct(*prev, *curr, pt); |
| 101 | if (d == 0) return PointInPolygonResult::IsOn; |
no test coverage detected