/*
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.
*/
/*
* AlgoAngleConic.java
*
* Created on 30. August 2001, 21:37
*/
package org.geogebra.common.kernel.algos;
import org.geogebra.common.euclidian.draw.DrawAngle;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.Matrix.Coords;
import org.geogebra.common.kernel.geos.GeoAngle;
import org.geogebra.common.kernel.geos.GeoConic;
import org.geogebra.common.kernel.geos.GeoElement;
/**
*
* @author Markus
*/
public class AlgoAngleConic extends AlgoAngle {
private GeoConic c; // input
private GeoAngle angle; // output
/**
* @param cons
* construction
* @param label
* output label
* @param c
* conic
*/
public AlgoAngleConic(Construction cons, String label, GeoConic c) {
super(cons);
this.c = c;
angle = new GeoAngle(cons);
setInputOutput(); // for AlgoElement
compute();
angle.setDrawable(true);
angle.setLabel(label);
}
// for AlgoElement
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = c;
setOutputLength(1);
setOutput(0, angle);
setDependencies(); // done by AlgoElement
}
/**
* @return resulting angle
*/
public GeoAngle getAngle() {
return angle;
}
// compute conic's angle
@Override
public final void compute() {
// take a look at first eigenvector
angle.setValue(Math.atan2(c.eigenvec[0].getY(), c.eigenvec[0].getX()));
}
@Override
public final String toString(StringTemplate tpl) {
return getLoc().getPlain("AngleOfA", c.getLabel(tpl));
}
@Override
public boolean updateDrawInfo(double[] m, double[] firstVec,
DrawAngle drawable) {
m[0] = c.b.getX();
m[1] = c.b.getY();
firstVec[0] = 1;
firstVec[1] = 0;
return true;
}
@Override
public boolean getCoordsInD3(Coords[] drawCoords) {
drawCoords[0] = c.getMidpoint3D();
drawCoords[1] = Coords.VX;
drawCoords[2] = c.getEigenvec3D(0);
return true;
}
}