// Copyright 2001 freehep
package org.freehep.graphicsio;

import java.awt.geom.Point2D;
import java.io.IOException;

/**
 * Implements the Quadratic Bezier Curve PathConstructor functionality in terms of
 * Cubic Bezier Curves
 *
 * @author Mark Donszelmann
 * @version $Id: QuadToCubicPathConstructor.java,v 1.1 2002/08/28 22:44:05 duns Exp $
 */
public abstract class QuadToCubicPathConstructor extends AbstractPathConstructor {

    protected QuadToCubicPathConstructor() {
        super();
    }

    public void move(double x, double y) throws IOException {
        currentX = x;
        currentY = y;
    }

    public void line(double x, double y) throws IOException {
        currentX = x;
        currentY = y;
    }

    public void quad(double x1, double y1, double x2, double y2) throws IOException {
        double xctrl1 = x1+(currentX-x1)/3.;
        double yctrl1 = y1+(currentY-y1)/3.;
        double xctrl2 = x1+(x2-x1)/3.;
        double yctrl2 = y1+(y2-y1)/3.;

        cubic(xctrl1, yctrl1, xctrl2, yctrl2, x2, y2);

        currentX = x2;
        currentY = y2;
    }

    public void cubic(double x1, double y1, double x2, double y2, double x3, double y3) throws IOException {
        currentX = x3;
        currentY = y3;
    }

    public void closePath() throws IOException {
        currentX = 0;
        currentY = 0;
    }
}