/*
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org
This file is part of GeoGebra.
This program 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.
*/
package org.geogebra.common.kernel.cas;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.algos.AlgoElement;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoCurveCartesian;
import org.geogebra.common.kernel.geos.GeoElement;
/**
* Parametric derivative of a curve c. The parametric derivative of a curve c(t)
* = (x(t), y(t)) is defined as (x(t), y'(t)/x'(t)).
*
* @author Markus Hohenwarter
*/
public class AlgoParametricDerivative extends AlgoElement implements UsesCAS {
private GeoCurveCartesian curve, paramDeriv;
/**
* @param cons
* construction
* @param label
* label for output
* @param curve
* curve
*/
public AlgoParametricDerivative(Construction cons, String label,
GeoCurveCartesian curve) {
this(cons, curve);
paramDeriv.setLabel(label);
}
private AlgoParametricDerivative(Construction cons,
GeoCurveCartesian curve) {
super(cons);
this.curve = curve;
paramDeriv = (GeoCurveCartesian) curve.copyInternal(cons);
setInputOutput(); // for AlgoElement
compute();
}
@Override
public Commands getClassName() {
return Commands.ParametricDerivative;
}
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = curve;
setOutputLength(1);
setOutput(0, paramDeriv);
setDependencies(); // done by AlgoElement
}
/**
* @return parametric derivative
*/
public GeoCurveCartesian getParametricDerivative() {
return paramDeriv;
}
@Override
final public void compute() {
if (!curve.isDefined()) {
paramDeriv.setUndefined();
return;
}
// compute parametric derivative
// (x(t), y'(t)/x'(t))
paramDeriv.setParametricDerivative(curve);
}
@Override
final public String toString(StringTemplate tpl) {
return getLoc().getPlain("ParametricDerivativeOfA",
curve.toGeoElement().getLabel(tpl));
}
}