QgsRegularPolygon::QgsRegularPolygon( const QgsPoint ¢er, const QgsPoint &pt1, const int numSides, const ConstructionOption circle )
: mCenter( center )
, mFirstVertex( QgsPoint() )
, mNumberSides( 0 )
, mRadius( 0.0 )
{
if ( numSides >= 3 )
{
mNumberSides = numSides;
switch ( circle )
{
case InscribedCircle:
{
mFirstVertex = pt1;
mRadius = center.distance( pt1 );
break;
}
case CircumscribedCircle:
{
mRadius = apothemToRadius( center.distance( pt1 ), numSides );
double azimuth = center.azimuth( pt1 );
// TODO: inclination
mFirstVertex = mCenter.project( mRadius, azimuth - centralAngle( numSides ) / 2 );
break;
}
default:
break;
}
}
}
QgsRegularPolygon::QgsRegularPolygon( const QgsPoint &pt1, const QgsPoint &pt2, const int numSides )
: mCenter( QgsPoint() )
, mFirstVertex( QgsPoint() )
, mNumberSides( 0 )
, mRadius( 0.0 )
{
if ( numSides >= 3 )
{
mNumberSides = numSides;
double azimuth = pt1.azimuth( pt2 );
QgsPoint pm = QgsGeometryUtils::midpoint( pt1, pt2 );
double length = pt1.distance( pm );
double angle = ( 180 - ( 360 / numSides ) ) / 2.0;
double hypothenuse = length / cos( angle * M_PI / 180 );
// TODO: inclination
mCenter = pt1.project( hypothenuse, azimuth + angle );
mFirstVertex = pt1;
mRadius = qAbs( hypothenuse );
}
}
