ST_TriangleAspect (h2gis-functions 2.2.1 API)

java.lang.Object
- org.h2gis.api.AbstractFunction
- - org.h2gis.api.DeterministicScalarFunction
  - - org.h2gis.functions.spatial.topography.ST_TriangleAspect

All Implemented Interfaces:

org.h2gis.api.Function, org.h2gis.api.ScalarFunction
```
public class ST_TriangleAspect
extends org.h2gis.api.DeterministicScalarFunction
```
This function is used to compute the aspect of a triangle. Aspect represents the main slope direction angle compared to the north direction.

Author:

Erwan Bocher

Field Summary
- Fields inherited from interface org.h2gis.api.Function
  PROP_NAME, PROP_REMARKS
- Fields inherited from interface org.h2gis.api.ScalarFunction
  PROP_DETERMINISTIC

Constructor Summary

Constructors
Constructor Description

ST_TriangleAspect()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Double`	`computeAspect(org.locationtech.jts.geom.Geometry geometry)`	Compute the aspect in degree.
`String`	`getJavaStaticMethod()`
`static double`	`measureFromNorth(double angle)`	Transforms an angle measured in degrees counterclockwise from the x-axis (mathematicians) to an angle measured in degrees clockwise from the y-axis (geographers).

Methods inherited from class org.h2gis.api.AbstractFunction
addProperty, getProperty, removeProperty

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2gis.api.Function
getProperty

- Constructor Detail
  - ST_TriangleAspect
```
public ST_TriangleAspect()
```
- Method Detail
  - getJavaStaticMethod
```
public String getJavaStaticMethod()
```
  - computeAspect
```
public static Double computeAspect(org.locationtech.jts.geom.Geometry geometry)
                            throws IllegalArgumentException
```
    Compute the aspect in degree. The geometry must be a triangle.
    
    Parameters:
    
    geometry - Polygon triangle
    
    Returns:
    
    aspect in degree
    
    Throws:
    
    IllegalArgumentException - ST_TriangleAspect accept only triangles
  - measureFromNorth
```
public static double measureFromNorth(double angle)
```
    Transforms an angle measured in degrees counterclockwise from the x-axis (mathematicians) to an angle measured in degrees clockwise from the y-axis (geographers).
    
    Parameters:
    
    angle - Mathematician's angle
    
    Returns:
    
    Geographer's angle