[ VIGRA Homepage | Function Index | Class Index | Namespaces | File List | Main Page ]
#include <vigra/polygon.hxx>
Public Member Functions | |
double | arcLengthQuantile (double quantile) const |
bool | closed () const |
Returns true iff the last and first points are equal or the polygon is empty. | |
bool | contains (const_reference point, coordinate_type tolerance) const |
Point | interpolate (unsigned int index, double offset) const |
Polygons in two and higher dimenions.
Linearly interpolate at offset
between knots index
and index+1
.
Preconditions: 0 <= index < size()-1
and 0 <= offset <= 1
.
Tests whether the given point lies within this polygon. Requires that this polygon is closed.
Points which lie directly on the polylines or coincide with a knot are considered inside (this behavior is consistent with fillPolygon()). Parameter tolerance (interpreted as an absolute error bound) controls the numerical accuracy of this test.
Find the point on the polygon that corresponds to the given quantile.
quantile must be in [0.0, 1.0]
. The result of this function can be used as input to interpolate()
. For example, the following code computes the point in the middle of the polygon:
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |