Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\geom\Line2D.java

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
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 *
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 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.javafx.geom;

import com.sun.javafx.geom.transform.BaseTransform;

/**
 * This <code>Line2D</code> represents a line segment in {@code (x,y)}
 * coordinate space. This class, like all of the Java 2D API, uses a
 * default coordinate system called user space in which the y-axis
 * values increase downward and x-axis values increase to the right. For
 * more information on the user space coordinate system, see the
 * <a href="http://java.sun.com/j2se/1.3/docs/guide/2d/spec/j2d-intro.fm2.html#61857">
 * Coordinate Systems</a> section of the Java 2D Programmer's Guide.
 *
 * @version 1.37, 05/05/07
 */
public class Line2D extends Shape {
 /**
 * The X coordinate of the start point of the line segment.
 */
 public float x1;

/**
     * The Y coordinate of the start point of the line segment.
     */
    public float y1;

/**
     * The X coordinate of the end point of the line segment.
     */
    public float x2;

/**
     * The Y coordinate of the end point of the line segment.
     */
    public float y2;

/**
     * Constructs and initializes a Line with coordinates (0, 0) -> (0, 0).
     */
    public Line2D() { }

/**
     * Constructs and initializes a Line from the specified coordinates.
     * @param x1 the X coordinate of the start point
     * @param y1 the Y coordinate of the start point
     * @param x2 the X coordinate of the end point
     * @param y2 the Y coordinate of the end point
     */
    public Line2D(float x1, float y1, float x2, float y2) {
        setLine(x1, y1, x2, y2);
    }

/**
 * Constructs and initializes a <code>Line2D</code> from the
 * specified <code>Point2D</code> objects.
 * @param p1 the start <code>Point2D</code> of this line segment
 * @param p2 the end <code>Point2D</code> of this line segment
 */
 public Line2D(Point2D p1, Point2D p2) {
 setLine(p1, p2);
 }

/**
 * Sets the location of the end points of this <code>Line2D</code>
 * to the specified float coordinates.
 * @param x1 the X coordinate of the start point
 * @param y1 the Y coordinate of the start point
 * @param x2 the X coordinate of the end point
 * @param y2 the Y coordinate of the end point
 */
 public void setLine(float x1, float y1, float x2, float y2) {
 this.x1 = x1;
 this.y1 = y1;
 this.x2 = x2;
 this.y2 = y2;
 }

/**
 * Sets the location of the end points of this <code>Line2D</code> to
 * the specified <code>Point2D</code> coordinates.
 * @param p1 the start <code>Point2D</code> of the line segment
 * @param p2 the end <code>Point2D</code> of the line segment
 */
 public void setLine(Point2D p1, Point2D p2) {
 setLine(p1.x, p1.y, p2.x, p2.y);
 }

/**
 * Sets the location of the end points of this <code>Line2D</code> to
 * the same as those end points of the specified <code>Line2D</code>.
 * @param l the specified <code>Line2D</code>
 */
 public void setLine(Line2D l) {
 setLine(l.x1, l.y1, l.x2, l.y2);
 }

/**
     * {@inheritDoc}
     */
    public RectBounds getBounds() {
        RectBounds b = new RectBounds();
        b.setBoundsAndSort(x1, y1, x2, y2);
        return b;
    }

/**
     * @inheritDoc
     */
    @Override
    public boolean contains(float x, float y) { return false; }

/**
     * @inheritDoc
     */
    @Override
    public boolean contains(float x, float y, float w, float h) { return false; }

/**
     * @inheritDoc
     */
    @Override
    public boolean contains(Point2D p) { return false; }

/**
     * @inheritDoc
     */
    @Override
    public boolean intersects(float x, float y, float w, float h) {
        int out1, out2;
        if ((out2 = outcode(x, y, w, h, x2, y2)) == 0) {
            return true;
        }
        float px = x1;
        float py = y1;
        while ((out1 = outcode(x, y, w, h, px, py)) != 0) {
            if ((out1 & out2) != 0) {
                return false;
            }
            if ((out1 & (OUT_LEFT | OUT_RIGHT)) != 0) {
                px = x;
                if ((out1 & OUT_RIGHT) != 0) {
                    px += w;
                }
                py = y1 + (px - x1) * (y2 - y1) / (x2 - x1);
            } else {
                py = y;
                if ((out1 & OUT_BOTTOM) != 0) {
                    py += h;
                }
                px = x1 + (py - y1) * (x2 - x1) / (y2 - y1);
            }
        }
        return true;
    }

/**
 * Returns an indicator of where the specified point
 * {@code (px,py)} lies with respect to the line segment from
 * {@code (x1,y1)} to {@code (x2,y2)}.
 * The return value can be either 1, -1, or 0 and indicates
 * in which direction the specified line must pivot around its
 * first end point, {@code (x1,y1)}, in order to point at the
 * specified point {@code (px,py)}.
 * A return value of 1 indicates that the line segment must
 * turn in the direction that takes the positive X axis towards
 * the negative Y axis. In the default coordinate system used by
 * Java 2D, this direction is counterclockwise.
 * A return value of -1 indicates that the line segment must
 * turn in the direction that takes the positive X axis towards
 * the positive Y axis. In the default coordinate system, this
 * direction is clockwise.
 * A return value of 0 indicates that the point lies
 * exactly on the line segment. Note that an indicator value
 * of 0 is rare and not useful for determining colinearity
 * because of floating point rounding issues.
 * If the point is colinear with the line segment, but
 * not between the end points, then the value will be -1 if the point
 * lies "beyond {@code (x1,y1)}" or 1 if the point lies
 * "beyond {@code (x2,y2)}".
 *
 * @param x1 the X coordinate of the start point of the
 * specified line segment
 * @param y1 the Y coordinate of the start point of the
 * specified line segment
 * @param x2 the X coordinate of the end point of the
 * specified line segment
 * @param y2 the Y coordinate of the end point of the
 * specified line segment
 * @param px the X coordinate of the specified point to be
 * compared with the specified line segment
 * @param py the Y coordinate of the specified point to be
 * compared with the specified line segment
 * @return an integer that indicates the position of the third specified
 * coordinates with respect to the line segment formed
 * by the first two specified coordinates.
 */
 public static int relativeCCW(float x1, float y1,
 float x2, float y2,
 float px, float py)
 {
 x2 -= x1;
 y2 -= y1;
 px -= x1;
 py -= y1;
 float ccw = px * y2 - py * x2;
 if (ccw == 0.0f) {
 // The point is colinear, classify based on which side of
 // the segment the point falls on. We can calculate a
 // relative value using the projection of px,py onto the
 // segment - a negative value indicates the point projects
 // outside of the segment in the direction of the particular
 // endpoint used as the origin for the projection.
 ccw = px * x2 + py * y2;
 if (ccw > 0.0f) {
 // Reverse the projection to be relative to the original x2,y2
 // x2 and y2 are simply negated.
 // px and py need to have (x2 - x1) or (y2 - y1) subtracted
 // from them (based on the original values)
 // Since we really want to get a positive answer when the
 // point is "beyond (x2,y2)", then we want to calculate
 // the inverse anyway - thus we leave x2 & y2 negated.
 px -= x2;
 py -= y2;
 ccw = px * x2 + py * y2;
 if (ccw < 0.0f) {
 ccw = 0.0f;
 }
 }
 }
 return (ccw < 0.0f) ? -1 : ((ccw > 0.0f) ? 1 : 0);
 }

/**
 * Returns an indicator of where the specified point
 * {@code (px,py)} lies with respect to this line segment.
 * See the method comments of
 * {@link #relativeCCW(double, double, double, double, double, double)}
 * to interpret the return value.
 * @param px the X coordinate of the specified point
 * to be compared with this <code>Line2D</code>
 * @param py the Y coordinate of the specified point
 * to be compared with this <code>Line2D</code>
 * @return an integer that indicates the position of the specified
 * coordinates with respect to this <code>Line2D</code>
 * @see #relativeCCW(double, double, double, double, double, double)
 */
 public int relativeCCW(float px, float py) {
 return relativeCCW(x1, y1, x2, y2, px, py);
 }

/**
 * Returns an indicator of where the specified <code>Point2D</code>
 * lies with respect to this line segment.
 * See the method comments of
 * {@link #relativeCCW(double, double, double, double, double, double)}
 * to interpret the return value.
 * @param p the specified <code>Point2D</code> to be compared
 * with this <code>Line2D</code>
 * @return an integer that indicates the position of the specified
 * <code>Point2D</code> with respect to this <code>Line2D</code>
 * @see #relativeCCW(double, double, double, double, double, double)
 */
 public int relativeCCW(Point2D p) {
 return relativeCCW(x1, y1, x2, y2, p.x, p.y);
 }

/**
 * Tests if the line segment from {@code (x1,y1)} to
 * {@code (x2,y2)} intersects the line segment from {@code (x3,y3)}
 * to {@code (x4,y4)}.
 *
 * @param x1 the X coordinate of the start point of the first
 * specified line segment
 * @param y1 the Y coordinate of the start point of the first
 * specified line segment
 * @param x2 the X coordinate of the end point of the first
 * specified line segment
 * @param y2 the Y coordinate of the end point of the first
 * specified line segment
 * @param x3 the X coordinate of the start point of the second
 * specified line segment
 * @param y3 the Y coordinate of the start point of the second
 * specified line segment
 * @param x4 the X coordinate of the end point of the second
 * specified line segment
 * @param y4 the Y coordinate of the end point of the second
 * specified line segment
 * @return <code>true</code> if the first specified line segment
 * and the second specified line segment intersect
 * each other; <code>false</code> otherwise.
 */
 public static boolean linesIntersect(float x1, float y1,
 float x2, float y2,
 float x3, float y3,
 float x4, float y4)
 {
 return ((relativeCCW(x1, y1, x2, y2, x3, y3) *
 relativeCCW(x1, y1, x2, y2, x4, y4) <= 0)
 && (relativeCCW(x3, y3, x4, y4, x1, y1) *
 relativeCCW(x3, y3, x4, y4, x2, y2) <= 0));
 }

/**
 * Tests if the line segment from {@code (x1,y1)} to
 * {@code (x2,y2)} intersects this line segment.
 *
 * @param x1 the X coordinate of the start point of the
 * specified line segment
 * @param y1 the Y coordinate of the start point of the
 * specified line segment
 * @param x2 the X coordinate of the end point of the
 * specified line segment
 * @param y2 the Y coordinate of the end point of the
 * specified line segment
 * @return <true> if this line segment and the specified line segment
 * intersect each other; <code>false</code> otherwise.
 */
 public boolean intersectsLine(float x1, float y1, float x2, float y2) {
 return linesIntersect(x1, y1, x2, y2, this.x1, this.y1, this.x2, this.y2);
 }

/**
 * Tests if the specified line segment intersects this line segment.
 * @param l the specified <code>Line2D</code>
 * @return <code>true</code> if this line segment and the specified line
 * segment intersect each other;
 * <code>false</code> otherwise.
 */
 public boolean intersectsLine(Line2D l) {
 return linesIntersect(l.x1, l.y1, l.x2, l.y2, this.x1, this.y1, this.x2, this.y2);
 }

/**
 * Returns the square of the distance from a point to a line segment.
 * The distance measured is the distance between the specified
 * point and the closest point between the specified end points.
 * If the specified point intersects the line segment in between the
 * end points, this method returns 0.0.
 *
 * @param x1 the X coordinate of the start point of the
 * specified line segment
 * @param y1 the Y coordinate of the start point of the
 * specified line segment
 * @param x2 the X coordinate of the end point of the
 * specified line segment
 * @param y2 the Y coordinate of the end point of the
 * specified line segment
 * @param px the X coordinate of the specified point being
 * measured against the specified line segment
 * @param py the Y coordinate of the specified point being
 * measured against the specified line segment
 * @return a double value that is the square of the distance from the
 * specified point to the specified line segment.
 * @see #ptLineDistSq(double, double, double, double, double, double)
 */
 public static float ptSegDistSq(float x1, float y1,
 float x2, float y2,
 float px, float py)
 {
 // Adjust vectors relative to x1,y1
 // x2,y2 becomes relative vector from x1,y1 to end of segment
 x2 -= x1;
 y2 -= y1;
 // px,py becomes relative vector from x1,y1 to test point
 px -= x1;
 py -= y1;
 float dotprod = px * x2 + py * y2;
 float projlenSq;
 if (dotprod <= 0f) {
 // px,py is on the side of x1,y1 away from x2,y2
 // distance to segment is length of px,py vector
 // "length of its (clipped) projection" is now 0.0
 projlenSq = 0f;
 } else {
 // switch to backwards vectors relative to x2,y2
 // x2,y2 are already the negative of x1,y1=>x2,y2
 // to get px,py to be the negative of px,py=>x2,y2
 // the dot product of two negated vectors is the same
 // as the dot product of the two normal vectors
 px = x2 - px;
 py = y2 - py;
 dotprod = px * x2 + py * y2;
 if (dotprod <= 0f) {
 // px,py is on the side of x2,y2 away from x1,y1
 // distance to segment is length of (backwards) px,py vector
 // "length of its (clipped) projection" is now 0.0
 projlenSq = 0f;
 } else {
 // px,py is between x1,y1 and x2,y2
 // dotprod is the length of the px,py vector
 // projected on the x2,y2=>x1,y1 vector times the
 // length of the x2,y2=>x1,y1 vector
 projlenSq = dotprod * dotprod / (x2 * x2 + y2 * y2);
 }
 }
 // Distance to line is now the length of the relative point
 // vector minus the length of its projection onto the line
 // (which is zero if the projection falls outside the range
 // of the line segment).
 float lenSq = px * px + py * py - projlenSq;
 if (lenSq < 0f) {
 lenSq = 0f;
 }
 return lenSq;
 }

/**
     * Returns the distance from a point to a line segment.
     * The distance measured is the distance between the specified
     * point and the closest point between the specified end points.
     * If the specified point intersects the line segment in between the
     * end points, this method returns 0.0.
     *
     * @param x1 the X coordinate of the start point of the
     *           specified line segment
     * @param y1 the Y coordinate of the start point of the
     *           specified line segment
     * @param x2 the X coordinate of the end point of the
     *           specified line segment
     * @param y2 the Y coordinate of the end point of the
     *           specified line segment
     * @param px the X coordinate of the specified point being
     *           measured against the specified line segment
     * @param py the Y coordinate of the specified point being
     *           measured against the specified line segment
     * @return a double value that is the distance from the specified point
     *              to the specified line segment.
     * @see #ptLineDist(double, double, double, double, double, double)
     */
    public static float ptSegDist(float x1, float y1,
                   float x2, float y2,
                   float px, float py)
    {
        return (float) Math.sqrt(ptSegDistSq(x1, y1, x2, y2, px, py));
    }

/**
     * Returns the square of the distance from a point to this line segment.
     * The distance measured is the distance between the specified
     * point and the closest point between the current line's end points.
     * If the specified point intersects the line segment in between the
     * end points, this method returns 0.0.
     *
     * @param px the X coordinate of the specified point being
     *           measured against this line segment
     * @param py the Y coordinate of the specified point being
     *           measured against this line segment
     * @return a double value that is the square of the distance from the
     *          specified point to the current line segment.
     * @see #ptLineDistSq(double, double)
     */
    public float ptSegDistSq(float px, float py) {
        return ptSegDistSq(x1, y1, x2, y2, px, py);
    }

/**
 * Returns the square of the distance from a <code>Point2D</code> to
 * this line segment.
 * The distance measured is the distance between the specified
 * point and the closest point between the current line's end points.
 * If the specified point intersects the line segment in between the
 * end points, this method returns 0.0.
 * @param pt the specified <code>Point2D</code> being measured against
 * this line segment.
 * @return a double value that is the square of the distance from the
 * specified <code>Point2D</code> to the current
 * line segment.
 * @see #ptLineDistSq(Point2D)
 */
 public float ptSegDistSq(Point2D pt) {
 return ptSegDistSq(x1, y1, x2, y2, pt.x, pt.y);
 }

/**
     * Returns the distance from a point to this line segment.
     * The distance measured is the distance between the specified
     * point and the closest point between the current line's end points.
     * If the specified point intersects the line segment in between the
     * end points, this method returns 0.0.
     *
     * @param px the X coordinate of the specified point being
     *           measured against this line segment
     * @param py the Y coordinate of the specified point being
     *           measured against this line segment
     * @return a double value that is the distance from the specified
     *          point to the current line segment.
     * @see #ptLineDist(double, double)
     */
    public double ptSegDist(float px, float py) {
        return ptSegDist(x1, y1, x2, y2, px, py);
    }

/**
 * Returns the distance from a <code>Point2D</code> to this line
 * segment.
 * The distance measured is the distance between the specified
 * point and the closest point between the current line's end points.
 * If the specified point intersects the line segment in between the
 * end points, this method returns 0.0.
 * @param pt the specified <code>Point2D</code> being measured
 * against this line segment
 * @return a double value that is the distance from the specified
 * <code>Point2D</code> to the current line
 * segment.
 * @see #ptLineDist(Point2D)
 */
 public float ptSegDist(Point2D pt) {
 return ptSegDist(x1, y1, x2, y2, pt.x, pt.y);
 }

/**
 * Returns the square of the distance from a point to a line.
 * The distance measured is the distance between the specified
 * point and the closest point on the infinitely-extended line
 * defined by the specified coordinates. If the specified point
 * intersects the line, this method returns 0.0.
 *
 * @param x1 the X coordinate of the start point of the specified line
 * @param y1 the Y coordinate of the start point of the specified line
 * @param x2 the X coordinate of the end point of the specified line
 * @param y2 the Y coordinate of the end point of the specified line
 * @param px the X coordinate of the specified point being
 * measured against the specified line
 * @param py the Y coordinate of the specified point being
 * measured against the specified line
 * @return a double value that is the square of the distance from the
 * specified point to the specified line.
 * @see #ptSegDistSq(double, double, double, double, double, double)
 */
 public static float ptLineDistSq(float x1, float y1,
 float x2, float y2,
 float px, float py)
 {
 // Adjust vectors relative to x1,y1
 // x2,y2 becomes relative vector from x1,y1 to end of segment
 x2 -= x1;
 y2 -= y1;
 // px,py becomes relative vector from x1,y1 to test point
 px -= x1;
 py -= y1;
 float dotprod = px * x2 + py * y2;
 // dotprod is the length of the px,py vector
 // projected on the x1,y1=>x2,y2 vector times the
 // length of the x1,y1=>x2,y2 vector
 float projlenSq = dotprod * dotprod / (x2 * x2 + y2 * y2);
 // Distance to line is now the length of the relative point
 // vector minus the length of its projection onto the line
 float lenSq = px * px + py * py - projlenSq;
 if (lenSq < 0f) {
 lenSq = 0f;
 }
 return lenSq;
 }

/**
     * Returns the distance from a point to a line.
     * The distance measured is the distance between the specified
     * point and the closest point on the infinitely-extended line
     * defined by the specified coordinates.  If the specified point
     * intersects the line, this method returns 0.0.
     *
     * @param x1 the X coordinate of the start point of the specified line
     * @param y1 the Y coordinate of the start point of the specified line
     * @param x2 the X coordinate of the end point of the specified line
     * @param y2 the Y coordinate of the end point of the specified line
     * @param px the X coordinate of the specified point being
     *           measured against the specified line
     * @param py the Y coordinate of the specified point being
     *           measured against the specified line
     * @return a double value that is the distance from the specified
     *           point to the specified line.
     * @see #ptSegDist(double, double, double, double, double, double)
     */
    public static float ptLineDist(float x1, float y1,
                    float x2, float y2,
                    float px, float py)
    {
        return (float) Math.sqrt(ptLineDistSq(x1, y1, x2, y2, px, py));
    }

/**
 * Returns the square of the distance from a point to this line.
 * The distance measured is the distance between the specified
 * point and the closest point on the infinitely-extended line
 * defined by this <code>Line2D</code>. If the specified point
 * intersects the line, this method returns 0.0.
 *
 * @param px the X coordinate of the specified point being
 * measured against this line
 * @param py the Y coordinate of the specified point being
 * measured against this line
 * @return a double value that is the square of the distance from a
 * specified point to the current line.
 * @see #ptSegDistSq(double, double)
 */
 public float ptLineDistSq(float px, float py) {
 return ptLineDistSq(x1, y1, x2, y2, px, py);
 }

/**
 * Returns the square of the distance from a specified
 * <code>Point2D</code> to this line.
 * The distance measured is the distance between the specified
 * point and the closest point on the infinitely-extended line
 * defined by this <code>Line2D</code>. If the specified point
 * intersects the line, this method returns 0.0.
 * @param pt the specified <code>Point2D</code> being measured
 * against this line
 * @return a double value that is the square of the distance from a
 * specified <code>Point2D</code> to the current
 * line.
 * @see #ptSegDistSq(Point2D)
 */
 public float ptLineDistSq(Point2D pt) {
 return ptLineDistSq(x1, y1, x2, y2, pt.x, pt.y);
 }

/**
 * Returns the distance from a point to this line.
 * The distance measured is the distance between the specified
 * point and the closest point on the infinitely-extended line
 * defined by this <code>Line2D</code>. If the specified point
 * intersects the line, this method returns 0.0.
 *
 * @param px the X coordinate of the specified point being
 * measured against this line
 * @param py the Y coordinate of the specified point being
 * measured against this line
 * @return a double value that is the distance from a specified point
 * to the current line.
 * @see #ptSegDist(double, double)
 */
 public float ptLineDist(float px, float py) {
 return ptLineDist(x1, y1, x2, y2, px, py);
 }

/**
 * Returns the distance from a <code>Point2D</code> to this line.
 * The distance measured is the distance between the specified
 * point and the closest point on the infinitely-extended line
 * defined by this <code>Line2D</code>. If the specified point
 * intersects the line, this method returns 0.0.
 * @param pt the specified <code>Point2D</code> being measured
 * @return a double value that is the distance from a specified
 * <code>Point2D</code> to the current line.
 * @see #ptSegDist(Point2D)
 */
 public float ptLineDist(Point2D pt) {
 return ptLineDist(x1, y1, x2, y2, pt.x, pt.y);
 }

/**
 * Returns an iteration object that defines the boundary of this
 * <code>Line2D</code>.
 * The iterator for this class is not multi-threaded safe,
 * which means that this <code>Line2D</code> class does not
 * guarantee that modifications to the geometry of this
 * <code>Line2D</code> object do not affect any iterations of that
 * geometry that are already in process.
 * @param tx the specified {@link BaseTransform}
 * @return a {@link PathIterator} that defines the boundary of this
 * <code>Line2D</code>.
 */
 public PathIterator getPathIterator(BaseTransform tx) {
 return new LineIterator(this, tx);
 }

/**
 * Returns an iteration object that defines the boundary of this
 * flattened <code>Line2D</code>.
 * The iterator for this class is not multi-threaded safe,
 * which means that this <code>Line2D</code> class does not
 * guarantee that modifications to the geometry of this
 * <code>Line2D</code> object do not affect any iterations of that
 * geometry that are already in process.
 * @param tx the specified <code>BaseTransform</code>
 * @param flatness the maximum amount that the control points for a
 * given curve can vary from colinear before a subdivided
 * curve is replaced by a straight line connecting the
 * end points. Since a <code>Line2D</code> object is
 * always flat, this parameter is ignored.
 * @return a <code>PathIterator</code> that defines the boundary of the
 * flattened <code>Line2D</code>
 */
 public PathIterator getPathIterator(BaseTransform tx, float flatness) {
 return new LineIterator(this, tx);
 }

@Override
    public Line2D copy() {
        return new Line2D(x1, y1, x2, y2);
    }

@Override
    public int hashCode() {
        int bits = java.lang.Float.floatToIntBits(x1);
        bits += java.lang.Float.floatToIntBits(y1) * 37;
        bits += java.lang.Float.floatToIntBits(x2) * 43;
        bits += java.lang.Float.floatToIntBits(y2) * 47;
        return bits;
    }

@Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof Line2D) {
            Line2D line = (Line2D) obj;
            return ((x1 == line.x1) && (y1 == line.y1) &&
                    (x2 == line.x2) && (y2 == line.y2));
        }
        return false;
    }
}

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