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Area formula changed

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Kolan Sh 2012-05-03 16:04:04 +04:00
parent 8bc5c25008
commit b2b873acc8
1 changed files with 1 additions and 1 deletions
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Polygon.c
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@ -69,7 +69,7 @@ double __Polygon_area (const Polygon *this)
this->points[(i + 1) % this->npoints].x * this->points[i].y; this->points[(i + 1) % this->npoints].x * this->points[i].y;
} }
return s * 0.5; return fabs (s) * 0.5;
// Trapezium rule for convex and non-convex polygons // Trapezium rule for convex and non-convex polygons
// S=abs(сумма{(x[i+1]-x[i])*(y[i+1]+y[i])/2}) // S=abs(сумма{(x[i+1]-x[i])*(y[i+1]+y[i])/2})
} }