package org.geogebra.common.kernel.commands;
import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.algos.AlgoRootInterval;
import org.geogebra.common.kernel.algos.AlgoRootNewton;
import org.geogebra.common.kernel.algos.AlgoRootsPolynomial;
import org.geogebra.common.kernel.algos.AlgoRootsPolynomialInterval;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.arithmetic.ExpressionNode;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoFunction;
import org.geogebra.common.kernel.geos.GeoFunctionable;
import org.geogebra.common.kernel.geos.GeoNumberValue;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.main.MyError;
import org.geogebra.common.plugin.Operation;
/**
* Root[ <GeoFunction> ] Root[ <GeoFunction> , <Number> ] Root[ <GeoFunction> ,
* <Number> , <Number> ]
*/
public class CmdRoot extends CommandProcessor {
/**
* Create new command processor
*
* @param kernel
* kernel
*/
public CmdRoot(Kernel kernel) {
super(kernel);
}
@Override
final public GeoElement[] process(Command c) throws MyError {
int n = c.getArgumentNumber();
boolean[] ok = new boolean[n];
GeoElement[] arg;
switch (n) {
// roots of polynomial
case 1:
arg = resArgs(c);
if ((arg[0].isGeoFunctionable())) {
GeoFunction gf = ((GeoFunctionable) arg[0]).getGeoFunction();
return Root(c, gf);
}
throw argErr(app, c, arg[0]);
// root with start value
case 2:
arg = resArgs(c);
if ((ok[0] = arg[0].isGeoFunctionable())
&& (ok[1] = (arg[1] instanceof GeoNumberValue))) {
AlgoRootNewton algo = new AlgoRootNewton(cons, c.getLabel(),
((GeoFunctionable) arg[0]).getGeoFunction(),
(GeoNumberValue) arg[1]);
GeoElement[] ret = { algo.getRootPoint() };
return ret;
}
throw argErr(app, c, getBadArg(ok, arg));
// root in interval
case 3:
arg = resArgs(c);
if ((ok[0] = (arg[0].isGeoFunctionable()))
&& (ok[1] = (arg[1] instanceof GeoNumberValue))
&& (ok[2] = (arg[2] instanceof GeoNumberValue))) {
AlgoRootInterval algo = new AlgoRootInterval(cons, c.getLabel(),
((GeoFunctionable) arg[0]).getGeoFunction(),
(GeoNumberValue) arg[1], (GeoNumberValue) arg[2]);
GeoElement[] ret = { algo.getRootPoint() };
return ret;
}
throw argErr(app, c, getBadArg(ok, arg));
default:
throw argNumErr(app, c, n);
}
}
/**
* all Roots of polynomial f (works only for polynomials and functions that
* can be simplified to factors of polynomials, e.g. sqrt(x) to x)
*/
final private GeoPoint[] Root(Command c, GeoFunction f) {
// special case for If
// non-polynomial -> undefined
ExpressionNode exp = f.getFunctionExpression();
if (exp.getOperation().equals(Operation.IF)) {
AlgoRootsPolynomialInterval algo = new AlgoRootsPolynomialInterval(
cons, c.getLabels(), f);
GeoPoint[] g = algo.getRootPoints();
return g;
}
// allow functions that can be simplified to factors of polynomials
if (!f.getConstruction().isFileLoading()
&& !f.isPolynomialFunction(true) && f.isDefined()) {
throw argErr(app, c, f);
}
AlgoRootsPolynomial algo = new AlgoRootsPolynomial(cons, c.getLabels(),
f);
GeoPoint[] g = algo.getRootPoints();
return g;
}
}