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howsiwei avatar howsiwei commented on July 19, 2024 1

I don't think so, because in polygon.cpp the convention is that a n-sided polygon is representated as a vector of n + 1 vertices where the last vertex equals the first. You can see this at

cpbook-code/ch7/polygon.cpp

Lines 178 to 186 in 6fa2d29

// 6(+1) points, entered in counter clockwise order, 0-based indexing
vector<point> P;
P.emplace_back(1, 1); // P0
P.emplace_back(3, 3); // P1
P.emplace_back(9, 1); // P2
P.emplace_back(12, 4); // P3
P.emplace_back(9, 7); // P4
P.emplace_back(1, 7); // P5
P.push_back(P[0]); // loop back, P6 = P0

from cpbook-code.

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