QgsGeometry QgsTransectAlgorithm::calcTransect( const QgsPoint &point, const double angleAtVertex, const double length, const QgsTransectAlgorithm::Side orientation, const double angle )
{
QgsPoint pLeft; // left point of the line
QgsPoint pRight; // right point of the line
QgsPolyline line;
if ( ( orientation == QgsTransectAlgorithm::Right ) || ( orientation == QgsTransectAlgorithm::Both ) )
{
pLeft = point.project( length, angle + 180.0 / M_PI * angleAtVertex );
if ( orientation != QgsTransectAlgorithm::Both )
pRight = point;
}
if ( ( orientation == QgsTransectAlgorithm::Left ) || ( orientation == QgsTransectAlgorithm::Both ) )
{
pRight = point.project( -length, angle + 180.0 / M_PI * angleAtVertex );
if ( orientation != QgsTransectAlgorithm::Both )
pLeft = point;
}
line.append( pLeft );
line.append( pRight );
return QgsGeometry::fromPolyline( line );
}
void QgsRegularPolygon::setCenter( const QgsPoint ¢er )
{
double azimuth = mCenter.azimuth( mFirstVertex );
// TODO: double inclination = mCenter.inclination(mFirstVertex);
mCenter = center;
mFirstVertex = center.project( mRadius, azimuth );
}
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 );
}
}
