File:Winding number algorithm example.svg
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Summary
| Description |
English: Example of the winding number algorithm, as described by Dan Sunday. The algorithm determines if a point is inside a given polygon (with counter-clockwise orientation). It does so by casting a horizontal ray starting from the point, and counting its edge crossings, incrementing 1 if the edge crosses upwards through the ray, and decrementing 1 if the edge crosses downwards. If the resulting number is 0, then the point is outside the polygon. Otherwise, the point is inside the polygon.
Português: Exemplo do algoritmo de índice, como descrito por Dan Sunday. O algoritmo determina se um ponto está dentro de um dado polígono (com orientação anti-horária). Ele faz isso traçando uma linha horizontal a partir do ponto, e contando cruzamentos de arestas, incrementando 1 se a aresta cruza a linha para cima, e decrementando 1 se a aresta cruza para baixo. Se o número resultante é 0, então o ponto está fora do polígono. Caso contrário, o ponto está dentro do polígono. |
| Date | |
| Source | Own work |
| Author | Avelludo |
| Other versions |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:12, 10 August 2021 | | 400 × 400 (3 KB) | wikimediacommons>Avelludo | Change last line to be an example of wn = −1, as that was previously missing (and might lead viewers to believe points inside the polygon require wn > 0, instead of the correct wn ≠ 0) |
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