AlgoLengthVector3D.java

/* 
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.

 */

/*
 * AlgoLengthVector.java
 *
 */

package org.geogebra.common.geogebra3D.kernel3D.algos;

import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.Matrix.Coords;
import org.geogebra.common.kernel.algos.AlgoElement;
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.kernelND.GeoVectorND;

/**
 * Length of a vector
 * 
 * @author mathieu
 */
public class AlgoLengthVector3D extends AlgoElement {

	private GeoVectorND v; // input
	private GeoNumeric num; // output

	AlgoLengthVector3D(Construction cons, String label, GeoVectorND v) {
		super(cons);
		this.v = v;
		num = new GeoNumeric(cons);
		setInputOutput(); // for AlgoElement

		// compute length
		compute();
		num.setLabel(label);
	}

	@Override
	public Commands getClassName() {
		return Commands.Length;
	}

	// for AlgoElement
	@Override
	protected void setInputOutput() {
		input = new GeoElement[1];
		input[0] = (GeoElement) v;

		setOnlyOutput(num);
		setDependencies(); // done by AlgoElement
	}

	GeoNumeric getLength() {
		return num;
	}

	// calc length of vector v
	@Override
	public final void compute() {
		Coords coords = v.getDirectionInD3();
		coords.calcNorm();
		num.setValue(coords.getNorm());
	}

	@Override
	final public String toString(StringTemplate tpl) {
		return getLoc().getPlain("LengthOfA", ((GeoElement) v).getLabel(tpl));
	}

}