IsRightTriangle Class Reference

Checks if the given polygon is a right triangle. More...

Inheritance diagram for IsRightTriangle:

Collaboration diagram for IsRightTriangle:

Public Member Functions
String	getURI ()
boolean	attribute (Geometry geom)
boolean	isRightAngledTriangle (Coordinate[] coords)
	Checks if a polygon with three coordinates is a right triangle. More...
double	getLength (Coordinate point1, Coordinate point2)
	Calculates the length of an edge of a triangle. More...
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Detailed Description

Checks if the given polygon is a right triangle.

Member Function Documentation

attribute()

boolean attribute

(

Geometry

geom

)

Reimplemented from GeometricBinaryAttributeFunction.

                                                {
                if (geom instanceof Polygon) {
                if(geom.getCoordinates().length==4) {
                        return isRightAngledTriangle(geom.getCoordinates());
                }
                }
                return false;
        }

References IsRightTriangle.isRightAngledTriangle().

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

                                                                                                            {
                if (args.length != 1) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 1 arguments, got " + args.length);
                }
                
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                System.out.println(l);
                if(l instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        boolean result = attribute(geom);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");
 
        }

References GeometricBinaryAttributeFunction.attribute(), and LiteralRegistry.getLiteral().

Referenced by IsCollectionTest.testGeometryCollectionIsCollection(), HasConnectedInteriorTest.testHasConnectedInteriorFalse(), HasConnectedInteriorTest.testHasConnectedInteriorTrue(), HasDuplicateRingsTest.testHasDuplicateRingsFalse(), HasDuplicateRingsTest.testHasDuplicateRingsTrue(), HasHorizontalCRSTest.testHasHorizontalCRSFalse(), HasHorizontalCRSTest.testHasHorizontalCRSTrue(), HasRepeatedPointsTest.testHasRepeatedPoints(), HasRepeatedPointsTest.testHasRepeatedPoints2(), HasSelfIntersectionsTest.testHasSelfIntersectionsFalse(), HasSelfIntersectionsTest.testHasSelfIntersectionsTrue(), Is3DTest.testIs3DFalse(), IsAcuteTest.testIsAcuteFalse(), IsAcuteTest.testIsAcuteTrue(), IsConvexTest.testIsConvexFalse(), IsConvexTest.testIsConvexTrue(), IsEmptyTest.testIsEmptyFalse(), IsEmptyTest.testIsEmptyTrue(), IsEquilateralTriangleTest.testIsEquilateralTriangleFalse(), IsEquilateralTriangleTest.testIsEquilateralTriangleTrue(), IsIsocelesTriangleTest.testIsIsocelesTriangleFalse(), IsIsocelesTriangleTest.testIsIsocelesTriangleTrue(), IsMeasuredTest.testIsMeasuredFalse(), IsMeasuredTest.testIsMeasuredTrue(), IsNodingValidTest.testIsNodingValuedTrue(), IsObliqueTriangleTest.testIsObliqueTriangleFalse(), IsObtuseTriangleTest.testIsObliqueTriangleFalse(), IsObliqueTriangleTest.testIsObliqueTriangleTrue(), IsObtuseTriangleTest.testIsObliqueTriangleTrue(), IsPlanarTest.testIsPlanarTrue(), IsPolygonCCWTest.testIsPolygonCCWFalse(), IsPolygonCCWTest.testIsPolygonCCWTrue(), IsPolygonCWTest.testIsPolygonCWFalse(), IsPolygonCWTest.testIsPolygonCWTrue(), IsRectangleTest.testIsRectangleFalse(), IsRectangleTest.testIsRectangleTrue(), IsRightTriangleTest.testIsRightTriangleFalse(), IsRightTriangleTest.testIsRightTriangleTrue(), IsSolidTest.testIsSolidFalse(), IsSquareTest.testIsSquareFalse(), IsSquareTest.testIsSquareTrue(), IsTriangleTest.testIsTriangleFalse(), IsTriangleTest.testIsTriangleTrue(), IsValidTest.testIsValidFalse(), IsValidTest.testIsValidTrue(), IsClosedTest.testLineStringClosed(), IsCollectionTest.testLineStringIsCollection(), IsRingTest.testLineStringIsNotRing(), IsRingTest.testLineStringIsRing(), IsClosedTest.testLineStringNotClosed(), IsCollectionTest.testMultiLineStringIsCollection(), IsClosedTest.testMultiLineStringNotClosed(), IsClosedTest.testmultiPointClosed(), IsCollectionTest.testMultiPointIsCollection(), IsCollectionTest.testMultiPolygonIsCollection(), IsClosedTest.testpointClosed(), IsCollectionTest.testPointIsCollection(), IsCollectionTest.testPolygonIsCollection(), SridHasFlippedAxisTest.testSridHasFlippedAxis(), SridIsGeographicTest.testSridIsGeographicFalse(), SridIsGeographicTest.testSridIsGeographicTrue(), SridIsProjectedTest.testSridIsProjectedTrue(), and SridIsVerticalTest.testSridIsVerticalTrue().

getLength()

double getLength	(	Coordinate	point1,
		Coordinate	point2
	)

Calculates the length of an edge of a triangle.

Parameters

point1	the beginning point of the edge
point2	the end point of the edge

Returns

the length of the edge

                                                                      {
            return Math.sqrt((point2.getX()-point1.getX())*(point2.getX()-point1.getX()) + (point2.getY()-point1.getY())*(point2.getY()-point1.getY()));
        }

Referenced by IsRightTriangle.isRightAngledTriangle().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_isRightTriangle.stringValue();
        }

References POSTGIS.st_isRightTriangle.

isRightAngledTriangle()

boolean isRightAngledTriangle

(

Coordinate[]

coords

)

Checks if a polygon with three coordinates is a right triangle.

Parameters

coords

the coordinates to be analyzed

Returns

true if the triangle is right angled

                                                                 {
                Coordinate a=coords[0];
                Coordinate b=coords[1];
                Coordinate c=coords[2];
            Double lengthA = getLength(a,b);
            Double lengthB = getLength(b,c);
            Double lengthC = getLength(c,a);
            return  Math.pow(lengthA, 2) + Math.pow(lengthB, 2) == Math.pow(lengthC, 2) ||
                    Math.pow(lengthA, 2) + Math.pow(lengthC, 2) == Math.pow(lengthB, 2) ||
                    Math.pow(lengthC, 2) + Math.pow(lengthB, 2) == Math.pow(lengthA, 2);
        }

References IsRightTriangle.getLength().

Referenced by IsRightTriangle.attribute().