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/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/package com.codename1.ui.geom;
/**
* This interface provides a directed path over the boundary of a shape. The path can contain 1st through 3rd order Bezier curves (lines, and quadratic and cubic splines). A shape can have multiple disjoint paths via the {@link #SEG_MOVETO} directive, and can close a circular path back to the previous {@link #SEG_MOVETO} via the {@link #SEG_CLOSE} directive.
*
*
* @author shannah
* @see GeneralPath
* @see Shape
* @see com.codename1.ui.Graphics#drawShape
* @see com.codename1.ui.Graphics#fillShape
*/
public interface PathIterator {
/**
* The even-odd winding mode: a point is internal to the shape if a ray from the point to infinity (in any direction) crosses an odd number of segments.
*/
public static final int WIND_EVEN_ODD = 0;
/**
* The non-zero winding mode: a point is internal to the shape if a ray from the point to infinity (in any direction) crosses a different number of segments headed clockwise than those headed counterclockwise.
*/
public static final int WIND_NON_ZERO = 1;
/**
* Starts a new subpath. There is no segment from the previous vertex.
*/
public static final int SEG_MOVETO = 0;
/**
* The current segment is a line.
*/
public static final int SEG_LINETO = 1;
/**
* The current segment is a quadratic parametric curve. It is interpolated
* as t varies from 0 to 1 over the current point (CP), first control point
* (P1), and final interpolated control point (P2):
*
{@code
* P(t) = B(2,0)*CP + B(2,1)*P1 + B(2,2)*P2
* 0 <= t <= 1
* B(n,m) = mth coefficient of nth degree Bernstein polynomial
* = C(n,m) * t^(m) * (1 - t)^(n-m)
* C(n,m) = Combinations of n things, taken m at a time
* = n! / (m! * (n-m)!) }
*/
public static final int SEG_QUADTO = 2;
/**
* The current segment is a cubic parametric curve (more commonly known as a
* Bezier curve). It is interpolated as t varies from 0 to 1 over the
* current point (CP), first control point (P1), the second control point
* (P2), and final interpolated control point (P3):
*
{@code P(t) = B(3,0)*CP + B(3,1)*P1 + B(3,2)*P2 + B(3,3)*P3
* 0 <= t <= 1
* B(n,m) = mth coefficient of nth degree Bernstein polynomial
* = C(n,m) * t^(m) * (1 - t)^(n-m)
* C(n,m) = Combinations of n things, taken m at a time
* = n! / (m! * (n-m)!)}
*/
public static final int SEG_CUBICTO = 3;
/**
* The current segment closes a loop by an implicit line to the previous {@link #SEG_MOVETO} coordinate.
*/
public static final int SEG_CLOSE = 4;
/**
* Returns the winding rule to determine which points are inside this path.
* @return the winding rule. ({@link #WIND_EVEN_ODD} or {@link #WIND_NON_ZERO}).
*/
public int getWindingRule();
/**
* Tests if the iterator is exhausted. If this returns true, currentSegment and next may throw a RuntimeException (although this is not required).
* @return {@literal true} if the iteration is complete
*/
public boolean isDone();
/**
* Advance to the next segment in the iteration. It is not specified what this does if called when {@link #isDone} returns {@literal true}.
*/
public void next();
/**
* Returns the coordinates of the next point(s), as well as the type of line segment.
* The input array must be at least a {@code float[6]}, to accommodate up to three
* {@code (x,y)} point pairs (although if you know the iterator is flat, you can probably
* get by with a {@code float[2]}). If the returned type is {@link #SEG_MOVETO} or {@link #SEG_LINETO},
* the first point in the array is modified; if the returned type is {@link #SEG_QUADTO},
* the first two points are modified; if the returned type is {@link #SEG_CUBICTO}, all three points are
* modified; and if the returned type is {@link #SEG_CLOSE}, the array is untouched.
* @param coords the array to place the point coordinates in
* @return the segment type. One of ({@link #SEG_MOVETO}, {@link #SEG_LINETO}, {@link #SEG_QUADTO}, {@link #SEG_CUBICTO}, {@link #SEG_CLOSE}).
*/
public int currentSegment(float[] coords);
/**
* Returns the coordinates of the next point(s), as well as the type of line segment.
* The input array must be at least a {@code double[6]}, to accommodate up to three
* {@code (x,y)} point pairs (although if you know the iterator is flat, you can probably
* get by with a {@code double[2]}). If the returned type is {@link #SEG_MOVETO} or {@link #SEG_LINETO},
* the first point in the array is modified; if the returned type is {@link #SEG_QUADTO},
* the first two points are modified; if the returned type is {@link #SEG_CUBICTO}, all three points are
* modified; and if the returned type is {@link #SEG_CLOSE}, the array is untouched.
* @param coords the array to place the point coordinates in
* @return the segment type. One of ({@link #SEG_MOVETO}, {@link #SEG_LINETO}, {@link #SEG_QUADTO}, {@link #SEG_CUBICTO}, {@link #SEG_CLOSE}).
*/
public int currentSegment(double[] coords);
}
