/*
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.
*/
/*
* AlgoAxes.java
*
* Created on 30. August 2001, 21:37
*/
package org.geogebra.common.kernel.advanced;
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.GeoElement;
import org.geogebra.common.kernel.geos.GeoLine;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.kernel.geos.GeoVec2D;
import org.geogebra.common.kernel.kernelND.GeoConicND;
import org.geogebra.common.kernel.kernelND.GeoLineND;
import org.geogebra.common.kernel.kernelND.GeoPointND;
/**
*
* @author Markus
*/
public class AlgoAxisFirst extends AlgoElement {
private GeoConicND c; // input
private GeoLine axis; // output
private GeoVec2D[] eigenvec;
private GeoVec2D b;
protected GeoPointND P;
protected AlgoAxisFirst(Construction cons, GeoConicND c) {
super(cons);
this.c = c;
}
public AlgoAxisFirst(Construction cons, String label, GeoConicND c) {
this(cons, c);
eigenvec = c.eigenvec;
b = c.b;
axis = new GeoLine(cons);
finishSetup(label);
}
protected void finishSetup(String label) {
P = new GeoPoint(cons);
getAxis().setStartPoint(P);
setInputOutput(); // for AlgoElement
compute();
getAxis().setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.FirstAxis;
}
// for AlgoElement
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = c;
setOutputLength(1);
setOutput(0, getAxis().toGeoElement());
setDependencies(); // done by AlgoElement
}
public GeoLineND getAxis() {
return axis;
}
protected GeoConicND getConic() {
return c;
}
// calc axes
@Override
public void compute() {
// axes are lines with directions of eigenvectors
// through midpoint b
axis.x = -eigenvec[0].getY();
axis.y = eigenvec[0].getX();
axis.z = -(axis.x * b.getX() + axis.y * b.getY());
P.setCoords(b.getX(), b.getY(), 1.0);
}
@Override
final public String toString(StringTemplate tpl) {
// Michael Borcherds 2008-03-30
// simplified to allow better Chinese translation
return getLoc().getPlain("FirstAxisOfA", c.getLabel(tpl));
}
}