Package org.meteoinfo.geoprocess

Class GeoComputation

java.lang.Object

org.meteoinfo.geoprocess.GeoComputation

public class GeoComputation
extends java.lang.Object

GeoComputation class

Constructor Summary

Constructors

Constructor	Description
GeoComputation()

Method Summary

Modifier and Type	Method	Description
static double	calArea(java.util.List<PointD> points)	Get polygon area on earth surface
static java.util.List<Shape>	clipLayer(VectorLayer subjectLayer, java.lang.Object clipObject)	Clip a vector layer by a polygon shape
static VectorLayer	clipLayer(VectorLayer subjectLayer, java.util.List<java.lang.Object> clipObjects)	Clip a vector layer by polygon shape list
static PointShape	clipPointShape(PointShape aPS, java.lang.Object clipObj)	Clip point shape with a clipping object
static PolygonShape	clipPolygonShape(PolygonShape aPGS, java.lang.Object clipObj)	Clip polygon shape with a clipping object
static PolygonShape	clipPolygonShape_Lat(PolygonShape aPGS, double lat)	Clip polygon shape with a latitude
static PolygonShape	clipPolygonShape_Lat(PolygonShape aPGS, double lat, boolean isTop)	Clip polygon shape with a latitude
static PolygonShape	clipPolygonShape_Lon(PolygonShape aPGS, double lon)	Clip polygon shape with a longitude
static PolylineShape	clipPolylineShape(PolylineShape aPLS, java.lang.Object clipObj)	Clip polyline shape with a clipping object
static PolylineShape	clipPolylineShape_Lat(PolylineShape aPLS, double lat)	Clip polyline shape with a longitude
static PolylineShape	clipPolylineShape_Lat(PolylineShape aPLS, double lat, boolean isTop)	Clip polyline shape with a longitude
static PolylineShape	clipPolylineShape_Lon(PolylineShape aPLS, double lon)	Clip polyline shape with a longitude
static Shape	clipShape(Shape aShape, java.lang.Object clipObj)	Clip a shape
static double	crossProduct(PointD p1, PointD p2, PointD p3)	Finds the cross product of the 2 vectors created by the 3 vertices.
static double	dis_PointToLine(PointD point, PointD pt1, PointD pt2)	Calculate the distance between point and a line segment
static double	distance(PointD pt1, PointD pt2)	Get distance between two points
static double	getArea(java.util.List<? extends PointD> points)	Get polygon area on earth surface
static double	getArea(java.util.List<? extends PointD> points, boolean isLonLat)	Get polygon area on earth surface
static double	getArea(java.util.List<java.lang.Number> x, java.util.List<java.lang.Number> y, boolean isLonLat)	Get polygon area
static double	getDistance(java.util.List<? extends PointD> points, boolean isLonLat)	Get distance
static double	getDistance(java.util.List<java.lang.Number> xx, java.util.List<java.lang.Number> yy, boolean isLonLat)	Get distance
static java.util.List<GridLabel>	getGridLabels(Polyline inPolyLine, Extent clipExtent, boolean isVertical)	Get grid labels of a polyline
static java.util.List<GridLabel>	getGridLabels_StraightLine(Polyline inPolyLine, Extent clipExtent, boolean isVertical)	Get grid labels of a straight line
static double	haversine(double x)	Haversine function : hav(x) = (1-cos(x))/2
static boolean	isClockwise(java.util.List<? extends PointD> pointList)	Determine if a point array is clockwise
static boolean	isClockwise(PointD[] points)	Determine if a point array is clockwise
static boolean	pointInPolygon(java.util.List<? extends PointD> poly, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygon(Polygon aPolygon, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygon(PolygonShape aPolygon, double x, double y)	Determine if a point is in a polygon
static boolean	pointInPolygon(PolygonShape aPolygon, PointD aPoint)	Determine if a point is in a polygon
static boolean	pointInPolygonLayer(VectorLayer aLayer, PointD aPoint, boolean onlySel)	Determine if a point loacted in a polygon layer
static boolean	pointInPolygons(java.util.List<PolygonShape> polygons, PointD aPoint)	Determine if a point located in polygons
static double	pointProduct(PointD p1, PointD p2, PointD p3)	Finds the point product of the 2 vectors created by the 3 vertices.
static java.lang.Object	selectPolyline(PointD sp, java.util.List<PointD> points, double buffer)	Select polyline shape by a point
static java.lang.Object	selectPolylineShape(PointD sp, PolylineShape aPLS, double buffer)	Select polyline shape by a point
static double	sphericalPolygonArea(double[] lat, double[] lon, double r)	Compute the Area of a Spherical Polygon
static double	sphericalPolygonArea(java.util.List<? extends PointD> points)	Compute the Area of a Spherical Polygon
static double	sphericalPolygonArea(java.util.List<? extends PointD> points, double r)	Compute the Area of a Spherical Polygon

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GeoComputation

public GeoComputation()

Method Detail

isClockwise

public static boolean isClockwise(java.util.List<? extends PointD> pointList)

Determine if a point array is clockwise

Parameters:

pointList - point list

Returns:

boolean

isClockwise

public static boolean isClockwise(PointD[] points)

Determine if a point array is clockwise

Parameters:

points - point array

Returns:

boolean

pointInPolygon

public static boolean pointInPolygon(java.util.List<? extends PointD> poly,
                                     PointD aPoint)

Determine if a point is in a polygon

Parameters:

poly - Polygon border points

aPoint - The point

Returns:

If the point is in the polygon

pointInPolygon

public static boolean pointInPolygon(PolygonShape aPolygon,
                                     PointD aPoint)

Determine if a point is in a polygon

Parameters:

aPolygon - The polygon

aPoint - The point

Returns:

Boolean

pointInPolygon

public static boolean pointInPolygon(PolygonShape aPolygon,
                                     double x,
                                     double y)

Determine if a point is in a polygon

Parameters:

aPolygon - The polygon

x - X

y - Y

Returns:

Boolean

pointInPolygon

public static boolean pointInPolygon(Polygon aPolygon,
                                     PointD aPoint)

Determine if a point is in a polygon

Parameters:

aPolygon - The polygon

aPoint - The point

Returns:

Boolean

pointInPolygons

public static boolean pointInPolygons(java.util.List<PolygonShape> polygons,
                                      PointD aPoint)

Determine if a point located in polygons

Parameters:

polygons - The polygons

aPoint - The point

Returns:

Boolean

pointInPolygonLayer

public static boolean pointInPolygonLayer(VectorLayer aLayer,
                                          PointD aPoint,
                                          boolean onlySel)

Determine if a point loacted in a polygon layer

Parameters:

aLayer - The polygon layer

aPoint - The point

onlySel - If check only selected shapes

Returns:

Inside or outside

dis_PointToLine

public static double dis_PointToLine(PointD point,
                                     PointD pt1,
                                     PointD pt2)

Calculate the distance between point and a line segment

Parameters:

point - The point

pt1 - End point of the line segment

pt2 - End point of the line segment

Returns:

Distance

distance

public static double distance(PointD pt1,
                              PointD pt2)

Get distance between two points

Parameters:

pt1 - Point one

pt2 - Point two

Returns:

Distance

selectPolylineShape

public static java.lang.Object selectPolylineShape(PointD sp,
                                                   PolylineShape aPLS,
                                                   double buffer)

Select polyline shape by a point

Parameters:

sp - The point

aPLS - The polyline shape

buffer - Buffer

Returns:

Is the polyline shape selected

selectPolyline

public static java.lang.Object selectPolyline(PointD sp,
                                              java.util.List<PointD> points,
                                              double buffer)

Select polyline shape by a point

Parameters:

sp - The point

points - The point list

buffer - Buffer

Returns:

Is the polyline shape selected

getArea

public static double getArea(java.util.List<java.lang.Number> x,
                             java.util.List<java.lang.Number> y,
                             boolean isLonLat)

Get polygon area

Parameters:

x - X coordinates

y - Y coordinates

isLonLat - If is on earth surface (lon/lat)

Returns:

Area

getArea

public static double getArea(java.util.List<? extends PointD> points,
                             boolean isLonLat)

Get polygon area on earth surface

Parameters:

points - point list

isLonLat - if is lon/lat

Returns:

area

getArea

public static double getArea(java.util.List<? extends PointD> points)

Get polygon area on earth surface

Parameters:

points - point list

Returns:

area

calArea

public static double calArea(java.util.List<PointD> points)

Get polygon area on earth surface

Parameters:

points - point list

Returns:

area

sphericalPolygonArea

public static double sphericalPolygonArea(java.util.List<? extends PointD> points)

Compute the Area of a Spherical Polygon

Parameters:

points - lon/lat point list

Returns:

area

sphericalPolygonArea

public static double sphericalPolygonArea(java.util.List<? extends PointD> points,
                                          double r)

Compute the Area of a Spherical Polygon

Parameters:

points - lon/lat point list

r - spherical radius

Returns:

area

haversine

public static double haversine(double x)

Haversine function : hav(x) = (1-cos(x))/2

Parameters:

x -

Returns:

Returns the value of Haversine function

sphericalPolygonArea

public static double sphericalPolygonArea(double[] lat,
                                          double[] lon,
                                          double r)

Compute the Area of a Spherical Polygon

Parameters:

lat - the latitudes of all vertices(in radian)

lon - the longitudes of all vertices(in radian)

r - spherical radius

Returns:

Returns the area of a spherical polygon

getDistance

public static double getDistance(java.util.List<? extends PointD> points,
                                 boolean isLonLat)

Get distance

Parameters:

points - Point list

isLonLat - If is lon/lat

Returns:

Distance

getDistance

public static double getDistance(java.util.List<java.lang.Number> xx,
                                 java.util.List<java.lang.Number> yy,
                                 boolean isLonLat)

Get distance

Parameters:

xx - X coordinates

yy - Y coordinates

isLonLat - If is lon/lat

Returns:

Distance

clipLayer

public static java.util.List<Shape> clipLayer(VectorLayer subjectLayer,
                                              java.lang.Object clipObject)

Clip a vector layer by a polygon shape

Parameters:

subjectLayer - Subject vector layer

clipObject - Cipping object

Returns:

Result clipped shapes

clipLayer

public static VectorLayer clipLayer(VectorLayer subjectLayer,
                                    java.util.List<java.lang.Object> clipObjects)

Clip a vector layer by polygon shape list

Parameters:

subjectLayer - Subject vector layer

clipObjects - Cipping object list

Returns:

Result clipped layer

clipShape

public static Shape clipShape(Shape aShape,
                              java.lang.Object clipObj)

Clip a shape

Parameters:

aShape - The shape

clipObj - Clipping object

Returns:

Clipped shape

clipPointShape

public static PointShape clipPointShape(PointShape aPS,
                                        java.lang.Object clipObj)

Clip point shape with a clipping object

Parameters:

aPS - The point shape

clipObj - Clipping object

Returns:

Clipped point shape

clipPolylineShape

public static PolylineShape clipPolylineShape(PolylineShape aPLS,
                                              java.lang.Object clipObj)

Clip polyline shape with a clipping object

Parameters:

aPLS - The polyline shape

clipObj - Clipping object

Returns:

Clipped polyline shape

clipPolylineShape_Lon

public static PolylineShape clipPolylineShape_Lon(PolylineShape aPLS,
                                                  double lon)

Clip polyline shape with a longitude

Parameters:

aPLS - Polyline shape

lon - Longitude

Returns:

Clipped polyline shape

clipPolylineShape_Lat

public static PolylineShape clipPolylineShape_Lat(PolylineShape aPLS,
                                                  double lat)

Clip polyline shape with a longitude

Parameters:

aPLS - Polyline shape

lat - The latitude

Returns:

Clipped polyline shape

clipPolylineShape_Lat

public static PolylineShape clipPolylineShape_Lat(PolylineShape aPLS,
                                                  double lat,
                                                  boolean isTop)

Clip polyline shape with a longitude

Parameters:

aPLS - Polyline shape

lat - Latitude

isTop - If is top

Returns:

Clipped polyline shape

clipPolygonShape

public static PolygonShape clipPolygonShape(PolygonShape aPGS,
                                            java.lang.Object clipObj)

Clip polygon shape with a clipping object

Parameters:

aPGS - Polygon shape

clipObj - Clipping object

Returns:

Clipped polygon shape

clipPolygonShape_Lon

public static PolygonShape clipPolygonShape_Lon(PolygonShape aPGS,
                                                double lon)

Clip polygon shape with a longitude

Parameters:

aPGS - Polygon shape

lon - Longitude

Returns:

Clipped polygon shape

clipPolygonShape_Lat

public static PolygonShape clipPolygonShape_Lat(PolygonShape aPGS,
                                                double lat)

Clip polygon shape with a latitude

Parameters:

aPGS - Polygon shape

lat - Latitude

Returns:

Clipped polygon shape

clipPolygonShape_Lat

public static PolygonShape clipPolygonShape_Lat(PolygonShape aPGS,
                                                double lat,
                                                boolean isTop)

Clip polygon shape with a latitude

Parameters:

aPGS - Polygon shape

lat - Latitude

isTop - If is top

Returns:

Clipped polygon shape

crossProduct

public static double crossProduct(PointD p1,
                                  PointD p2,
                                  PointD p3)

Finds the cross product of the 2 vectors created by the 3 vertices. Vector 1 = v1 -> v2, Vector 2 = v2 -> v3 The vectors make a "right turn" if the sign of the cross product is negative. The vectors make a "left turn" if the sign of the cross product is positive. The vectors are colinear (on the same line) if the cross product is zero.

Parameters:

p1 - Point 1

p2 - Point 2

p3 - Piont 3

Returns:

Cross product of the two vectors

pointProduct

public static double pointProduct(PointD p1,
                                  PointD p2,
                                  PointD p3)

Finds the point product of the 2 vectors created by the 3 vertices.

Parameters:

p1 - Point 1

p2 - Point 2

p3 - Piont 3

Returns:

Cross product of the two vectors

getGridLabels

public static java.util.List<GridLabel> getGridLabels(Polyline inPolyLine,
                                                      Extent clipExtent,
                                                      boolean isVertical)

Get grid labels of a polyline

Parameters:

inPolyLine - Polyline

clipExtent - Clipping object

isVertical - If is vertical

Returns:

Clip points

getGridLabels_StraightLine

public static java.util.List<GridLabel> getGridLabels_StraightLine(Polyline inPolyLine,
                                                                   Extent clipExtent,
                                                                   boolean isVertical)

Get grid labels of a straight line

Parameters:

inPolyLine - Polyline

clipExtent - Clipping object

isVertical - If is vertical

Returns:

Clip points