
edu.ucr.cs.bdlab.beast.generator.BitGenerator.scala Maven / Gradle / Ivy
/*
* Copyright 2020 University of California, Riverside
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package edu.ucr.cs.bdlab.beast.generator
import edu.ucr.cs.bdlab.beast.geolite.PointND
/**
* Generates points or boxes using the bit distribution
*
* @param partition
*/
class BitGenerator(partition: RandomSpatialPartition)
extends PointBasedGenerator(partition) {
val probability: Double = partition.opts.getDouble(BitDistribution.Probability, 0.2)
val digits: Int = partition.opts.getInt(BitDistribution.Digits, 10)
def generatePoint: PointND = {
val point = new PointND(geometryFactory, partition.dimensions)
for (d <- 0 until partition.dimensions) {
point.setCoordinate(d, generateCoordinate)
}
point
}
private def generateCoordinate: Double = {
var n: Double = 0.0
for (i <- 1 to digits) {
val c = bernoulli(probability)
n = n + c.toDouble / (1 << i)
}
n
}
}
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