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

import java.awt.Shape;
import java.io.IOException;

/**
 *  Interface for objects that are capable of constructing paths. Path painting
 *  (stroking or filling) is not included.
 *  @author Simon Fischer
 *  @version $Id: PathConstructor.java,v 1.2 2002/08/01 17:23:13 duns Exp $
 */
public interface PathConstructor {

    /**
     * Makes (x,y) the current point.
     */
    public void move(double x, double y) throws IOException;

    /**
     * Draws a line from the current point to (x,y) and make (x,y)
     * the current point.
     */
    public void line(double x, double y) throws IOException;

    /**
     * Draws a quadratic bezier curve from the current point to (x2, y2) using
     * the control point (x1, y1) and make (x2, y2) the current point.
     */
    public void quad(double x1, double y1, double x2, double y2) throws IOException;

    /**
     * Draws a cubic bezier curve from the current point to (x3, y3) using
     * the control points (x1, y1) and (x2, y2) and make (x3, y3)
     * the current point.
     */
    public void cubic(double x1, double y1,
              double x2, double y2,
              double x3, double y3) throws IOException;

    /**
     * Closes the path by drawing a straight line to the last point which was
     * argument to move.
     */
    public void closePath() throws IOException;

    /**
     * Flushes any cached info to the output file. The path is complete at this
     * point.
     */
    public void flush() throws IOException;

    /**
     * Adds the <i>points</i> of the shape using path <i>construction</i> operators.
     *  The path is neither stroked nor filled.
     *
     *  @return true if even-odd winding rule should be used, false if non-zero winding
     *  rule should be used.
     */
    public boolean addPath(Shape s) throws IOException;
}