comparison: src/invert.cpp
src/invert.cpp
- changeset 210
- 232e7634cc8a
- parent 206
- 654661eab7f3
- child 264
- 76a025db4948
equal
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inserted
replaced
| 209:c93e4a1eaadb | 210:232e7634cc8a |
|---|---|
| 34 } | 34 } |
| 35 | 35 |
| 36 /* | 36 /* |
| 37 * Inverts the winding of a polygon. | 37 * Inverts the winding of a polygon. |
| 38 */ | 38 */ |
| 39 void gl::invert(gl::Polygon& polygon) | 39 void gl::invert(PolygonElement& polygon) |
| 40 { | 40 { |
| 41 switch (polygon.numPolygonVertices()) | 41 visitPolygon<void>( |
| 42 { | 42 [](LineSegment&) {}, |
| 43 case 2: | 43 [](Triangle& tri) { |
| 44 case 3: | 44 std::swap(tri.p1, tri.p2); |
| 45 // 0 1 => 1 0 | 45 }, |
| 46 // 0 1 2 => 1 0 2 | 46 [](Quadrilateral& quad) { |
| 47 std::swap(polygon.vertices[0], polygon.vertices[1]); | 47 std::swap(quad.p1, quad.p3); |
| 48 break; | 48 }, |
| 49 case 4: | 49 [](ConditionalEdge&) {}, |
| 50 // 0 1 2 3 => 0 3 2 1 | 50 polygon); |
| 51 std::swap(polygon.vertices[1], polygon.vertices[3]); | |
| 52 break; | |
| 53 } | |
| 54 } | 51 } |
