AlgoOrthoVectorLine.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.

 */

/*
 * AlgoOrthoVectorLine.java
 *
 * Created on 30. August 2001, 21:37
 */

package org.geogebra.common.kernel.algos;

import org.geogebra.common.euclidian.EuclidianConstants;
import org.geogebra.common.kernel.CircularDefinitionException;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoLine;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.kernel.geos.GeoVector;

/**
 *
 * @author Markus
 */
public class AlgoOrthoVectorLine extends AlgoElement {

	private GeoLine g; // input
	private GeoVector n; // output

	// private GeoPoint startPoint;

	/** Creates new AlgoOrthoVectorLine */
	public AlgoOrthoVectorLine(Construction cons, String label, GeoLine g) {
		super(cons);
		this.g = g;
		n = new GeoVector(cons);

		GeoPoint possStartPoint = g.getStartPoint();
		if (possStartPoint != null && possStartPoint.isLabelSet()) {
			try {
				n.setStartPoint(possStartPoint);
			} catch (CircularDefinitionException e) {
			}
		}

		setInputOutput(); // for AlgoElement

		// compute line through P, Q
		n.z = 0.0d;
		compute();
		n.setLabel(label);
	}

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

	@Override
	public int getRelatedModeID() {
		return EuclidianConstants.MODE_ORTHOGONAL;
	}

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

		super.setOutputLength(1);
		super.setOutput(0, n);
		setDependencies(); // done by AlgoElement
	}

	public GeoVector getVector() {
		return n;
	}

	GeoLine getg() {
		return g;
	}

	// line through P normal to v
	@Override
	public final void compute() {
		n.x = g.x;
		n.y = g.y;
	}

	@Override
	final public String toString(StringTemplate tpl) {
		// Michael Borcherds 2008-03-30
		// simplified to allow better Chinese translation
		return getLoc().getPlain("VectorPerpendicularToA", g.getLabel(tpl));

	}

}