isOnSegment()

static int isOnSegment ( const POINT2D *  seg1, const POINT2D *  seg2, const POINT2D *  point  )

static

Definition at line 685 of file lwgeom_functions_analytic.c.

{
        double maxX;
        double maxY;
        double minX;
        double minY;
 
        if (seg1->x > seg2->x)
        {
                maxX = seg1->x;
                minX = seg2->x;
        }
        else
        {
                maxX = seg2->x;
                minX = seg1->x;
        }
        if (seg1->y > seg2->y)
        {
                maxY = seg1->y;
                minY = seg2->y;
        }
        else
        {
                maxY = seg2->y;
                minY = seg1->y;
        }
 
        POSTGIS_DEBUGF(3, "maxX minX/maxY minY: %.8f %.8f/%.8f %.8f", maxX, minX, maxY, minY);
 
        if (maxX < point->x || minX > point->x)
        {
                POSTGIS_DEBUGF(3, "X value %.8f falls outside the range %.8f-%.8f", point->x, minX, maxX);
 
                return 0;
        }
        else if (maxY < point->y || minY > point->y)
        {
                POSTGIS_DEBUGF(3, "Y value %.8f falls outside the range %.8f-%.8f", point->y, minY, maxY);
 
                return 0;
        }
        return 1;
}

References POINT2D::x, and POINT2D::y.

Referenced by point_in_ring(), and point_in_ring_rtree().

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