/*
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.
*/
/*
* Area of polygon P[0], ..., P[n]
*
*/
package org.geogebra.common.kernel.algos;
import org.geogebra.common.euclidian.EuclidianConstants;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoNumeric;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.kernel.geos.GeoPolygon;
import org.geogebra.common.kernel.kernelND.GeoElementND;
import org.geogebra.common.kernel.kernelND.GeoPointND;
import org.geogebra.common.kernel.prover.NoSymbolicParametersException;
import org.geogebra.common.kernel.prover.polynomial.PPolynomial;
import org.geogebra.common.kernel.prover.polynomial.PVariable;
/**
* Computes the area of a polygon
*
* @author mathieu
*/
public class AlgoAreaPolygon extends AlgoElement
implements SymbolicParametersBotanaAlgo {
private GeoPolygon polygon; // input
private GeoNumeric area; // output
private PVariable[] botanaVars;
public AlgoAreaPolygon(Construction cons, String label,
GeoPolygon polygon) {
super(cons);
this.polygon = polygon;
area = new GeoNumeric(cons);
setInputOutput(); // for AlgoElement
// compute angle
compute();
area.setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.Area;
}
@Override
public int getRelatedModeID() {
return EuclidianConstants.MODE_AREA;
}
// for AlgoElement
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = polygon;
setOutputLength(1);
setOutput(0, area);
setDependencies(); // done by AlgoElement
}
public GeoNumeric getArea() {
return area;
}
// calc area of conic c
@Override
public final void compute() {
/*
* if (!polygon.isDefined()) { area.setUndefined(); return; }
*/
area.setValue(polygon.getArea());
}
@Override
public PVariable[] getBotanaVars(GeoElementND geo)
throws NoSymbolicParametersException {
GeoPointND[] pointsOfPolygon = polygon.getPoints();
if (botanaVars == null) {
botanaVars = new PVariable[pointsOfPolygon.length * 2];
for (int i = 0; i < pointsOfPolygon.length; i++) {
PVariable[] currentPointBotanavars = ((GeoPoint) pointsOfPolygon[i])
.getBotanaVars(pointsOfPolygon[i]);
botanaVars[2 * i] = currentPointBotanavars[0];
botanaVars[2 * i + 1] = currentPointBotanavars[1];
}
}
return botanaVars;
}
@Override
public PPolynomial[] getBotanaPolynomials(GeoElementND geo)
throws NoSymbolicParametersException {
return null;
}
}