Package skyview.data

Class AngScale

java.lang.Object

skyview.data.AngScale

public class AngScale
extends Object

Find an appropriate delta to use for getting grid intervals. This class finds appropriate delta's given the range of the values and the fashion in which it is being displayed, e.g., sexagesimal or decimal. The intent is the the returned intervals can be displayed as exact values.

Constructor Summary

Constructors

Constructor	Description
AngScale()

Method Summary

Modifier and Type	Method	Description
static void	main(String[] args)
double	scale(double delta)	This function defines an appropriate interval between the grid values, given the absolute value of the range of the interval.
double[]	scaling(double min, double max)	Get the desired starting values and scaling interval.
void	setSexagesimal(boolean flag)	Do we want sexagesimal coordinates?
void	setTime(boolean flag)	Do we want coordinates in time?

Methods inherited from class java.lang.Object

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

Constructor Detail

AngScale

public AngScale()

Method Detail

scale

public double scale(double delta)

This function defines an appropriate interval between the grid values, given the absolute value of the range of the interval. We look at increasingly small candidate values until we find one which will split the range into an appropriate number of intervals.

Parameters:

delta - The range of the coordinate.

scaling

public double[] scaling(double min,
                        double max)

Get the desired starting values and scaling interval. First we get the delta between values, then we find the first value is 0 modulo the delta.

Parameters:

min - The minimum coordinate value.

max - The maximum coordinate value

Returns:

a two element vector giving the starting value and delta to be used. .

setSexagesimal

public void setSexagesimal(boolean flag)

Do we want sexagesimal coordinates?

setTime

public void setTime(boolean flag)

Do we want coordinates in time?

main

public static void main(String[] args)