org.opentripplanner.analyst.request

Class SampleGridRenderer.WTWDAccumulativeMetric

java.lang.Object

org.opentripplanner.analyst.request.SampleGridRenderer.WTWDAccumulativeMetric

All Implemented Interfaces:

AccumulativeGridSampler.AccumulativeMetric<SampleGridRenderer.WTWD>

Enclosing class:

SampleGridRenderer

public static class SampleGridRenderer.WTWDAccumulativeMetric
extends Object
implements AccumulativeGridSampler.AccumulativeMetric<SampleGridRenderer.WTWD>

Any given sample is weighted according to the inverse of the squared normalized distance + 1 to the grid sample. We add to the sampling time a default off-road walk distance to account for off-road sampling. TODO how does this "account" for off-road sampling ?

Constructor Summary

Constructors

Constructor and Description
WTWDAccumulativeMetric(double cosLat, double offRoadDistanceMeters, double offRoadSpeed, double gridSizeMeters)

Method Summary

Modifier and Type	Method and Description
boolean	closeSample(ZSampleGrid.ZSamplePoint<SampleGridRenderer.WTWD> point) A Generated closing sample take 1) as off-road distance, the minimum of the off-road distance of all enclosing samples, plus the grid size, and 2) as time the minimum time of all enclosing samples plus the grid size * off-road walk speed as additional time.
SampleGridRenderer.WTWD	cumulateSample(com.vividsolutions.jts.geom.Coordinate C0, com.vividsolutions.jts.geom.Coordinate Cs, SampleGridRenderer.WTWD z, SampleGridRenderer.WTWD zS, double offRoadSpeed) Callback function to handle a new added sample.

Methods inherited from class java.lang.Object

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

Constructor Detail

WTWDAccumulativeMetric

public WTWDAccumulativeMetric(double cosLat,
                              double offRoadDistanceMeters,
                              double offRoadSpeed,
                              double gridSizeMeters)

Method Detail

cumulateSample

public SampleGridRenderer.WTWD cumulateSample(com.vividsolutions.jts.geom.Coordinate C0,
                                              com.vividsolutions.jts.geom.Coordinate Cs,
                                              SampleGridRenderer.WTWD z,
                                              SampleGridRenderer.WTWD zS,
                                              double offRoadSpeed)

Description copied from interface: AccumulativeGridSampler.AccumulativeMetric

Callback function to handle a new added sample.

Specified by:

cumulateSample in interface AccumulativeGridSampler.AccumulativeMetric<SampleGridRenderer.WTWD>

Parameters:

C0 - The initial position of the sample, as given in the addSample() call.

Cs - The position of the sample on the grid, never farther away than (dX,dY)

z - The z value of the initial sample, as given in the addSample() call.

zS - The previous z value of the sample. Can be null if this is the first time, it's up to the caller to initialize the z value.

offRoadSpeed - The offroad speed to assume.

Returns:

The modified z value for the sample.

closeSample

public boolean closeSample(ZSampleGrid.ZSamplePoint<SampleGridRenderer.WTWD> point)

A Generated closing sample take 1) as off-road distance, the minimum of the off-road distance of all enclosing samples, plus the grid size, and 2) as time the minimum time of all enclosing samples plus the grid size * off-road walk speed as additional time. All this are approximations. TODO Is there a better way of computing this? Here the computation will be different based on the order where we close the samples.

Specified by:

closeSample in interface AccumulativeGridSampler.AccumulativeMetric<SampleGridRenderer.WTWD>

Parameters:

point - The point to set Z.

Returns:

True if the point "close" the set.