/* 
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.

 */

// adapted from AlgoImageCorner by Michael Borcherds 2007-11-26

package org.geogebra.common.kernel.algos;

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.GeoNumberValue;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.kernel.geos.GeoText;

public class AlgoTextCorner extends AlgoElement {

	private GeoText txt; // input
	private GeoPoint corner; // output
	private GeoNumberValue number;

	public AlgoTextCorner(Construction cons, String label, GeoText txt,
			GeoNumberValue number) {
		super(cons);
		this.txt = txt;
		this.number = number;

		// make sure bounding box of text is kept up to date
		// so we can use it in compute()
		txt.setNeedsUpdatedBoundingBox(true);
		txt.update();

		corner = new GeoPoint(cons);
		setInputOutput(); // for AlgoElement

		compute();
		corner.setLabel(label);

		cons.registerEuclidianViewCE(this);
	}

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

	// for AlgoElement
	@Override
	protected void setInputOutput() {
		input = new GeoElement[2];
		input[0] = txt;
		input[1] = number.toGeoElement();

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

	public GeoPoint getCorner() {
		return corner;
	}

	@Override
	public final void compute() {
		// determine bounding box size here
		txt.calculateCornerPoint(corner, (int) number.getDouble());
	}

	@Override
	public boolean euclidianViewUpdate() {
		// update text to update it's bounding box
		kernel.notifyUpdate(txt);

		// now compute()
		compute();

		// update corner
		corner.update();

		return true; // update cascade of dependent objects done in Construction
	}

}