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lbartoletti 2017-09-03 21:36:39 +02:00 committed by Matthias Kuhn
parent 8770625db2
commit 6ae929e9cb
4 changed files with 56 additions and 0 deletions
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10
resources/function_help/json/minimal_circle Normal file
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@ -0,0 +1,10 @@
{
"name": "minimal_circle",
"type": "function",
"description": "Returns the minimal enclosing circle of a geometry. It represents the minimum circle that encloses all geometries within the set.",
"arguments": [ {"arg":"geometry","description":"a geometry"},
{"arg":"segment", "description": "optional argument for polygon segmentation. By default this value is 36"}],
"examples": [ { "expression":"geom_to_wkt( minimal_circle( geom_from_wkt( 'LINESTRING(0 5, 0 -5, 2 1)' ), 4 ) )", "returns":"Polygon ((0 5, 5 -0, -0 -5, -5 0, 0 5))"},
{ "expression":"geom_to_wkt( minimal_circle( geom_from_wkt( 'MULTIPOINT(1 2, 3 4, 3 2)' ), 4 ) )", "returns":"Polygon ((3 4, 3 2, 1 2, 1 4, 3 4))"}
]
}

8
resources/function_help/json/oriented_bbox Normal file
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@ -0,0 +1,8 @@
{
"name": "oriented_bbox",
"type": "function",
"description":"Returns a geometry which represents the minimal oriented bounding box of an input geometry.",
"arguments": [ {"arg":"geom","description":"a geometry"} ],
"examples": [ { "expression":"geom_to_wkt( oriented_bbox( geom_from_wkt( 'MULTIPOINT(1 2, 3 4, 3 2)' ) ) )", "returns":"Polygon ((1 4, 1 2, 3 2, 3 4, 1 4))"}]
}

30
src/core/expression/qgsexpressionfunction.cpp
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@ -2535,6 +2535,29 @@ static QVariant fcnConvexHull( const QVariantList &values, const QgsExpressionCo
QVariant result = !geom.isNull() ? QVariant::fromValue( geom ) : QVariant();
return result;
}
static QVariant fcnMinimalCircle( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent )
{
QgsGeometry fGeom = QgsExpressionUtils::getGeometry( values.at( 0 ), parent );
QgsPointXY center;
double radius;
unsigned int segments = 36;
if ( values.length() == 2 )
segments = QgsExpressionUtils::getDoubleValue( values.at( 1 ), parent );
QgsGeometry geom = fGeom.minimalEnclosingCircle( center, radius, segments );
QVariant result = !geom.isNull() ? QVariant::fromValue( geom ) : QVariant();
return result;
}
static QVariant fcnOrientedBBox( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent )
{
QgsGeometry fGeom = QgsExpressionUtils::getGeometry( values.at( 0 ), parent );
double area, angle, width, height;
QgsGeometry geom = fGeom.orientedMinimumBoundingBox( area, angle, width, height );
QVariant result = !geom.isNull() ? QVariant::fromValue( geom ) : QVariant();
return result;
}
static QVariant fcnDifference( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent )
{
QgsGeometry fGeom = QgsExpressionUtils::getGeometry( values.at( 0 ), parent );
@ -4139,6 +4162,13 @@ const QList<QgsExpressionFunction *> &QgsExpression::Functions()
<< new QgsStaticExpressionFunction( QStringLiteral( "bounds_height" ), 1, fcnBoundsHeight, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "is_closed" ), 1, fcnIsClosed, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "convex_hull" ), 1, fcnConvexHull, QStringLiteral( "GeometryGroup" ), QString(), false, QSet<QString>(), false, QStringList() << QStringLiteral( "convexHull" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "oriented_bbox" ), QgsExpressionFunction::ParameterList()
<< QgsExpressionFunction::Parameter( QStringLiteral( "geometry" ) ),
fcnOrientedBBox, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "minimal_circle" ), QgsExpressionFunction::ParameterList()
<< QgsExpressionFunction::Parameter( QStringLiteral( "geometry" ) )
<< QgsExpressionFunction::Parameter( QStringLiteral( "segments" ), true, 36 ),
fcnMinimalCircle, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "difference" ), 2, fcnDifference, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "distance" ), 2, fcnDistance, QStringLiteral( "GeometryGroup" ) )
<< new QgsStaticExpressionFunction( QStringLiteral( "hausdorff_distance" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "geometry1" ) ) << QgsExpressionFunction::Parameter( QStringLiteral( "geometry2" ) )

8
tests/src/core/testqgsexpression.cpp
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@ -2302,6 +2302,14 @@ class TestQgsExpression: public QObject
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "bounds" ) << "bounds( $geometry )" << geom << false << true << QgsGeometry::fromRect( geom.boundingBox() );
geom = QgsGeometry::fromPolygon( polygon );
double bbox_area, bbox_angle, bbox_width, bbox_height;
QTest::newRow( "oriented_bbox" ) << "oriented_bbox( $geometry )" << geom << false << true << geom.orientedMinimumBoundingBox( bbox_area, bbox_angle, bbox_width, bbox_height );
geom = QgsGeometry::fromPolygon( polygon );
QgsPointXY circ_center;
double circ_radius;
QTest::newRow( "minimal_circle" ) << "minimal_circle( $geometry )" << geom << false << true << geom.minimalEnclosingCircle( circ_center, circ_radius );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "translate" ) << "translate( $geometry, 1, 2)" << geom << false << true << QgsGeometry::fromWkt( QStringLiteral( "POLYGON ((1 2,11 12,11 2,1 2))" ) );
geom = QgsGeometry::fromPolyline( line );