gov.nasa.worldwind.animation
Class AnimationSupport

java.lang.Object
  gov.nasa.worldwind.animation.AnimationSupport

public class AnimationSupport
extends Object

Constructor Summary

AnimationSupport()

Method Summary

static double	angularRatio(Angle x, Angle y) Calculate the angular ratio between two angles
static double	basicInterpolant(double interpolant, double startInterpolant, double stopInterpolant, int maxSmoothing) Calculate a normalized, smoothed interpolant
static double	clampDouble(double value, double min, double max) Clamps a value between a minimum and maximum
static long	getScaledTimeMillisecs(Angle begin, Angle end, Angle max, long minTimeMillisecs, long maxTimeMillisecs) Calculate a scaled tiome based on the ratio of the angular distance between the begin and end angles over the max value.
static long	getScaledTimeMillisecs(double beginZoom, double endZoom, long minTimeMillisecs, long maxTimeMillisecs) Calculate a scaled time based on the ratio of the distance between the beginZoom and endZoom distances over the larger of the beginZoom and endZoom.
static long	getScaledTimeMillisecs(LatLon beginLatLon, LatLon endLatLon, long minTimeMillis, long maxTimeMillis) Calcualte a scaled time based on the great circle distance between two points.
static double	interpolantNormalized(double amount, double startAmount, double stopAmount) Normalize an interpolant value
static double	interpolantSmoothed(double interpolant, int smoothingIterations) Smooth an interpolant value using hermite smoothing
static double	mixDouble(double amount, double value1, double value2) Calculate the linear interpolation between two values

Methods inherited from class java.lang.Object

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

Constructor Detail

AnimationSupport

public AnimationSupport()

Method Detail

angularRatio

public static double angularRatio(Angle x,
                                  Angle y)

Calculate the angular ratio between two angles

Parameters:

x - The numerator

y - The denominator

Returns:

The angular ratio of x/y>

basicInterpolant

public static double basicInterpolant(double interpolant,
                                      double startInterpolant,
                                      double stopInterpolant,
                                      int maxSmoothing)

Calculate a normalized, smoothed interpolant

Parameters:

interpolant - the unsmoothed, unnormalized interpolant

startInterpolant - the lower end of interpolant range

stopInterpolant - the higher end of the interpolant range

maxSmoothing - the numver of iterations to smooth.

Returns:

the normalized, smoothed interpolant

clampDouble

public static double clampDouble(double value,
                                 double min,
                                 double max)

Clamps a value between a minimum and maximum

Parameters:

value - the value to clamo

min - the minimum

max - the maximum

Returns:

the clamped value

getScaledTimeMillisecs

public static long getScaledTimeMillisecs(Angle begin,
                                          Angle end,
                                          Angle max,
                                          long minTimeMillisecs,
                                          long maxTimeMillisecs)

Calculate a scaled tiome based on the ratio of the angular distance between the begin and end angles over the max value.

Parameters:

begin - the begin angle

end - the end angle

max - the maximun number of degrees

minTimeMillisecs - the minimum length of time

maxTimeMillisecs - the maximum length of time

Returns:

the scaled time in milliseconds

getScaledTimeMillisecs

public static long getScaledTimeMillisecs(double beginZoom,
                                          double endZoom,
                                          long minTimeMillisecs,
                                          long maxTimeMillisecs)

Calculate a scaled time based on the ratio of the distance between the beginZoom and endZoom distances over the larger of the beginZoom and endZoom.

Parameters:

beginZoom - the begin zoom value

endZoom - the end zoom value

minTimeMillisecs - the minimum length of time

maxTimeMillisecs - the maximum length of time

Returns:

the scaled time in milliseconds

getScaledTimeMillisecs

public static long getScaledTimeMillisecs(LatLon beginLatLon,
                                          LatLon endLatLon,
                                          long minTimeMillis,
                                          long maxTimeMillis)

Calcualte a scaled time based on the great circle distance between two points. The time is calulated by interpolating between the minLengthMillis and the maxLengthMillis using the ratio of the spherical distance between the given positions over 180 degrees.

Parameters:

beginLatLon - The first geographic position

endLatLon - The second geographio position

minTimeMillis - The minimum length of tine

maxTimeMillis - The maximum length of time

Returns:

The scaled time in milliseconds.

interpolantNormalized

public static double interpolantNormalized(double amount,
                                           double startAmount,
                                           double stopAmount)

Normalize an interpolant value

Parameters:

amount - The value to normalize

startAmount - The lower end of the range

stopAmount - The upper end of the range

Returns:

the normalized interpolant

interpolantSmoothed

public static double interpolantSmoothed(double interpolant,
                                         int smoothingIterations)

Smooth an interpolant value using hermite smoothing

Parameters:

interpolant - The interpolant

smoothingIterations - the number of smoothing iterations

Returns:

the smoothed interpolant

mixDouble

public static double mixDouble(double amount,
                               double value1,
                               double value2)

Calculate the linear interpolation between two values

Parameters:

amount - The interpolant, a number between 0 and 1.

value1 - The minimum value of the range

value2 - The maximum value of the range

Returns:

the interpolated value