diff options
Diffstat (limited to 'engines/startrek/room.cpp')
| -rw-r--r-- | engines/startrek/room.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/engines/startrek/room.cpp b/engines/startrek/room.cpp index 9fc0431e81..f3b853acde 100644 --- a/engines/startrek/room.cpp +++ b/engines/startrek/room.cpp @@ -756,4 +756,26 @@ void Room::mccoyScan(int direction, TextRef text, bool changeDirection, bool fro showText(TX_SPEAKER_MCCOY, text, fromRDF); } +bool Room::isPointInPolygon(int16 offset, int16 x, int16 y) { + int16 *data = (int16 *)(_rdfData + offset); + int16 numVertices = data[1]; + int16 *vertData = &data[2]; + + for (int i = 0; i < numVertices; i++) { + Common::Point p1(vertData[0], vertData[1]); + Common::Point p2; + if (i == numVertices - 1) // Loop to 1st vertex + p2 = Common::Point(data[2], data[3]); + else + p2 = Common::Point(vertData[2], vertData[3]); + + if ((p2.x - p1.x) * (y - p1.y) - (p2.y - p1.y) * (x - p1.x) < 0) + return false; + + vertData += 2; + } + + return true; +} + } // End of namespace StarTrek |