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/*
* Copyright (c) 2010-2021 Haifeng Li. All rights reserved.
*
* Smile is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Smile is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Smile. If not, see .
*/
package smile.plot.vega;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* To test a data point in a filter transform or a test property in conditional
* encoding, a predicate definition of the following forms must be specified:
*
* - a Vega expression string, where datum can be used to refer to the current
* data object. For example, datum.b2 > 60 would test if the value in the
* field b2 for each data point is over 60.
*
* - one of the field predicates: equal, lt, lte, gt, gte, range, oneOf, or valid.
*
* - a parameter predicate, which defines the names of a selection that the data
* point should belong to (or a logical composition of selections).
*
* - a logical composition of (1), (2), or (3).
*
* @author Haifeng Li
*/
public class BinParams {
/** The BinParams specification. */
final ObjectNode spec = VegaLite.mapper.createObjectNode();
/** Constructor. */
public BinParams() {
}
/**
* Sets the value in the binned domain at which to anchor the bins,
* shifting the bin boundaries if necessary to ensure that a boundary
* aligns with the anchor value.
*
* @param value the anchor value.
* @return this object.
*/
public BinParams anchor(double value) {
spec.put("anchor", value);
return this;
}
/**
* Sets the number base to use for automatic bin determination
* (default is base 10).
*
* @param base the base number.
* @return this object.
*/
public BinParams base(int base) {
spec.put("base", base);
return this;
}
/**
* Sets the scale factors indicating allowable subdivisions. The default
* value is [5, 2], which indicates that for base 10 numbers (the default
* base), the method may consider dividing bin sizes by 5 and/or 2.
* For example, for an initial step size of 10, the method can check
* if bin sizes of 2 (= 10/5), 5 (= 10/2), or 1 (= 10/(5*2)) might also
* satisfy the given constraints.
*
* @param factors the scale factors
* @return this object.
*/
public BinParams divide(int... factors) {
ArrayNode node = spec.putArray("divide");
for (var factor : factors) {
node.add(factor);
}
return this;
}
/**
* Sets the range of desired bin values
*
* @param min the lower bound of desired bin values.
* @param max the upper bound of desired bin values.
* @return this object.
*/
public BinParams extent(double min, double max) {
spec.putArray("extent").add(min).add(max);
return this;
}
/**
* Sets the maximum number of bins.
*
* @param bins the maximum number of bins.
* @return this object.
*/
public BinParams maxBins(int bins) {
spec.put("maxbins", bins);
return this;
}
/**
* Sets the minimum allowable step size (particularly useful for
* integer values).
*
* @param size the minimum allowable step size.
* @return this object.
*/
public BinParams minStep(double size) {
spec.put("minstep", size);
return this;
}
/**
* Sets the exact step size between bins.
*
* @param size the exact step size between bins.
* @return this object.
*/
public BinParams step(double size) {
spec.put("step", size);
return this;
}
/**
* Sets an array of allowable step sizes to choose from.
*
* @param steps an array of allowable step sizes to choose from.
* @return this object.
*/
public BinParams steps(double... steps) {
ArrayNode node = spec.putArray("steps");
for (var step : steps) {
node.add(step);
}
return this;
}
/**
* If true, attempts to make the bin boundaries use human-friendly
* boundaries, such as multiples of ten.
*
* @param flag If true, attempts to make the bin boundaries use
* human-friendly boundaries, such as multiples of ten.
* @return this object.
*/
public BinParams nice(int flag) {
spec.put("nice", flag);
return this;
}
}
