mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-22 19:19:40 +08:00
574 lines
12 KiB
Java
574 lines
12 KiB
Java
/* Copyright (C) 2000, 2001, 2002 Free Software Foundation
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath 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; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath 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 for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
package java.awt.geom;
|
|
|
|
import java.awt.Rectangle;
|
|
import java.awt.Shape;
|
|
|
|
/**
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @date April 21, 2001
|
|
*/
|
|
|
|
public abstract class Line2D implements Shape, Cloneable
|
|
{
|
|
protected Line2D ()
|
|
{
|
|
}
|
|
|
|
public Object clone ()
|
|
{
|
|
try
|
|
{
|
|
return super.clone ();
|
|
}
|
|
catch (CloneNotSupportedException _)
|
|
{
|
|
// Can't happen.
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public boolean contains (double x, double y)
|
|
{
|
|
double x1 = getX1 ();
|
|
double t1 = (x - x1) / (getX2 () - x1);
|
|
if (t1 < 0 || t1 > 1)
|
|
return false;
|
|
double y1 = getY1 ();
|
|
double t2 = (y - y1) / (getY2 () - y1);
|
|
// FIXME: use of == here is bogus
|
|
return t2 >= 0 && t2 <= 1 && t1 == t2;
|
|
}
|
|
|
|
public boolean contains (double x, double y, double w, double h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
public boolean contains (Point2D p)
|
|
{
|
|
return contains (p.getX (), p.getY ());
|
|
}
|
|
|
|
public boolean contains (Rectangle2D r)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
public Rectangle getBounds ()
|
|
{
|
|
double x1 = getX1 ();
|
|
double y1 = getY1 ();
|
|
double x2 = getX2 ();
|
|
double y2 = getY2 ();
|
|
|
|
double x = Math.min (x1, x2);
|
|
double y = Math.min (y1, y2);
|
|
double w = Math.abs (x1 - x2);
|
|
double h = Math.abs (y1 - y2);
|
|
|
|
return new Rectangle ((int) x, (int) y, (int) w, (int) h);
|
|
}
|
|
|
|
public abstract Point2D getP1 ();
|
|
public abstract Point2D getP2 ();
|
|
|
|
public PathIterator getPathIterator (AffineTransform at)
|
|
{
|
|
return getPathIterator (at, 0);
|
|
}
|
|
|
|
public PathIterator getPathIterator (AffineTransform at, double flatness)
|
|
{
|
|
return at.new Iterator (new Iterator ());
|
|
}
|
|
|
|
public abstract double getX1 ();
|
|
public abstract double getY1 ();
|
|
public abstract double getX2 ();
|
|
public abstract double getY2 ();
|
|
|
|
public boolean intersects (double x, double y, double w, double h)
|
|
{
|
|
double x1 = getX1 ();
|
|
double y1 = getY1 ();
|
|
double x2 = getX2 ();
|
|
double y2 = getY2 ();
|
|
|
|
if (x1 >= x && x1 <= x + w && y1 >= y && y1 <= y +h)
|
|
return true;
|
|
if (x2 >= x && x2 <= x + w && y2 >= y && y2 <= y +h)
|
|
return true;
|
|
|
|
double x3 = x + w;
|
|
double y3 = y + h;
|
|
|
|
return (linesIntersect (x1, y1, x2, y2, x, y, x, y3)
|
|
|| linesIntersect (x1, y1, x2, y2, x, y3, x3, y3)
|
|
|| linesIntersect (x1, y1, x2, y2, x3, y3, x3, y)
|
|
|| linesIntersect (x1, y1, x2, y2, x3, y, x, y));
|
|
}
|
|
|
|
public boolean intersects (Rectangle2D r)
|
|
{
|
|
return intersects (r.getX (), r.getY (), r.getWidth (), r.getHeight ());
|
|
}
|
|
|
|
public boolean intersectsLine (double x1, double y1, double x2, double y2)
|
|
{
|
|
return linesIntersect (getX1 (), getY1 (), getX2 (), getY2(),
|
|
x1, y1, x2, y2);
|
|
}
|
|
|
|
public boolean intersectsLine (Line2D l)
|
|
{
|
|
return linesIntersect (getX1 (), getY1 (), getX2 (), getY2(),
|
|
l.getX1 (), l.getY1 (), l.getX2 (), l.getY2 ());
|
|
}
|
|
|
|
public static boolean linesIntersect (double x1, double y1,
|
|
double x2, double y2,
|
|
double x3,double y3,
|
|
double x4, double y4)
|
|
{
|
|
double beta = (((y1 - y3) * (x4 - x3) + (x1 - x3) * (y4 - y3))
|
|
/ ((y2 - y1) * (x4 - x3) + (x2 - x1) * (y4 - y3)));
|
|
if (beta < 0.0 || beta > 1.0)
|
|
return false;
|
|
double alpha = (x1 + beta * (x2 - x1) - x3) / (x4 - x3);
|
|
return alpha >= 0.0 && alpha <= 1.0;
|
|
}
|
|
|
|
public double ptLineDist (double px, double py)
|
|
{
|
|
return ptLineDist (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
px, py);
|
|
}
|
|
|
|
public static double ptLineDist (double x1, double y1,
|
|
double x2, double y2,
|
|
double px, double py)
|
|
{
|
|
return Math.sqrt (ptLineDistSq (x1, y1, x2, y2, px, py));
|
|
}
|
|
|
|
public double ptLineDist (Point2D p)
|
|
{
|
|
return ptLineDist (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
p.getX (), p.getY ());
|
|
}
|
|
|
|
public double ptLineDistSq (double px, double py)
|
|
{
|
|
return ptLineDistSq (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
px, py);
|
|
}
|
|
|
|
public static double ptLineDistSq (double x1, double y1,
|
|
double x2, double y2,
|
|
double px, double py)
|
|
{
|
|
double pd2 = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
|
|
|
|
double x, y;
|
|
if (pd2 == 0)
|
|
{
|
|
// Points are coincident.
|
|
x = x1;
|
|
y = y2;
|
|
}
|
|
else
|
|
{
|
|
double u = ((px - x1) * (x2 - x1) + (py - y1) * (y2 - y1)) / pd2;
|
|
x = x1 + u * (x2 - x1);
|
|
y = y1 + u * (y2 - y1);
|
|
}
|
|
|
|
return (x - px) * (x - px) + (y - py) * (y - py);
|
|
}
|
|
|
|
public double ptLineDistSq (Point2D p)
|
|
{
|
|
return ptLineDistSq (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
p.getX (), p.getY ());
|
|
}
|
|
|
|
public double ptSegDist (double px, double py)
|
|
{
|
|
return ptSegDist (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
px, py);
|
|
}
|
|
|
|
public static double ptSegDist (double x1, double y1,
|
|
double x2, double y2,
|
|
double px, double py)
|
|
{
|
|
return Math.sqrt (ptSegDistSq (x1, y1, x2, y2, px, py));
|
|
}
|
|
|
|
public double ptSegDist (Point2D p)
|
|
{
|
|
return ptSegDist (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
p.getX (), p.getY ());
|
|
}
|
|
|
|
public double ptSegDistSq (double px, double py)
|
|
{
|
|
return ptSegDistSq (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
px, py);
|
|
}
|
|
|
|
public static double ptSegDistSq (double x1, double y1,
|
|
double x2, double y2,
|
|
double px, double py)
|
|
{
|
|
double pd2 = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
|
|
|
|
double x, y;
|
|
if (pd2 == 0)
|
|
{
|
|
// Points are coincident.
|
|
x = x1;
|
|
y = y2;
|
|
}
|
|
else
|
|
{
|
|
double u = ((px - x1) * (x2 - x1) + (py - y1) * (y2 - y1)) / pd2;
|
|
|
|
if (u < 0)
|
|
{
|
|
// "Off the end"
|
|
x = x1;
|
|
y = y1;
|
|
}
|
|
else if (u > 1.0)
|
|
{
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
{
|
|
x = x1 + u * (x2 - x1);
|
|
y = y1 + u * (y2 - y1);
|
|
}
|
|
}
|
|
|
|
return (x - px) * (x - px) + (y - py) * (y - py);
|
|
}
|
|
|
|
public double ptSegDistSq (Point2D p)
|
|
{
|
|
return ptSegDistSq (getX1 (), getY1 (), getX2 (), getY2 (),
|
|
p.getX (), p.getY ());
|
|
}
|
|
|
|
public int relativeCCW (double px, double py)
|
|
{
|
|
return relativeCCW (getX1 (), getY1 (),
|
|
getX2 (), getY2 (),
|
|
px, py);
|
|
}
|
|
|
|
public static int relativeCCW (double x1, double y1,
|
|
double x2, double y2,
|
|
double px, double py)
|
|
{
|
|
// This is a somewhat silly way to compute this.
|
|
// Please write a better one.
|
|
double a1 = Math.atan2 (y2 - y1, x2 - x1);
|
|
double a2 = Math.atan2 (py - y1, px - x1);
|
|
|
|
double a = (a1 - a2) % (2 * Math.PI);
|
|
if (a == 0 || a == Math.PI)
|
|
{
|
|
double u = ((px - x1) * (x2 - x1) + (py - y1) * (y2 - y1));
|
|
if (u < 0.0)
|
|
return 1;
|
|
else if (u > 1.0)
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
return (a > 0 && a < Math.PI) ? 1 : -1;
|
|
}
|
|
|
|
public int relativeCCW (Point2D p)
|
|
{
|
|
return relativeCCW (getX1 (), getY1 (),
|
|
getX2 (), getY2 (),
|
|
p.getX (), p.getY ());
|
|
}
|
|
|
|
public abstract void setLine (double x1, double y1, double x2, double y2);
|
|
|
|
public void setLine (Line2D l)
|
|
{
|
|
setLine (l.getX1 (), l.getY1 (), l.getX2 (), l.getY2 ());
|
|
}
|
|
|
|
public void setLine (Point2D p1, Point2D p2)
|
|
{
|
|
setLine (p1.getX (), p1.getY (), p2.getX (), p2.getY ());
|
|
}
|
|
|
|
public static class Float extends Line2D
|
|
{
|
|
float x1, y1, x2, y2;
|
|
|
|
public Float ()
|
|
{
|
|
this (0.0F, 0.0F, 0.0F, 0.0F);
|
|
}
|
|
|
|
public Float (float x1, float y1, float x2, float y2)
|
|
{
|
|
this.x1 = x1;
|
|
this.y1 = y1;
|
|
this.x2 = x2;
|
|
this.y2 = y2;
|
|
}
|
|
|
|
public Float (Point2D p1, Point2D p2)
|
|
{
|
|
this.x1 = (float) p1.getX ();
|
|
this.y1 = (float) p1.getY ();
|
|
this.x2 = (float) p2.getX ();
|
|
this.y2 = (float) p2.getY ();
|
|
}
|
|
|
|
public Rectangle2D getBounds2D ()
|
|
{
|
|
float x = Math.min (x1, x2);
|
|
float w = Math.abs (x1 - x2);
|
|
float y = Math.min (y1, y2);
|
|
float h = Math.abs (y1 - y2);
|
|
return new Rectangle2D.Float (x, y, w, h);
|
|
}
|
|
|
|
public Point2D getP1 ()
|
|
{
|
|
return new Point2D.Float (x1, y1);
|
|
}
|
|
|
|
public Point2D getP2 ()
|
|
{
|
|
return new Point2D.Float (x2, y2);
|
|
}
|
|
|
|
public double getX1 ()
|
|
{
|
|
return x1;
|
|
}
|
|
|
|
public double getY1 ()
|
|
{
|
|
return y1;
|
|
}
|
|
|
|
public double getX2 ()
|
|
{
|
|
return x2;
|
|
}
|
|
|
|
public double getY2 ()
|
|
{
|
|
return y2;
|
|
}
|
|
|
|
public void setLine (double x1, double y1, double x2, double y2)
|
|
{
|
|
this.x1 = (float) x1;
|
|
this.y1 = (float) y1;
|
|
this.x2 = (float) x2;
|
|
this.y2 = (float) y2;
|
|
}
|
|
|
|
public void setLine (float x1, float y1, float x2, float y2)
|
|
{
|
|
this.x1 = x1;
|
|
this.y1 = y1;
|
|
this.x2 = x2;
|
|
this.y2 = y2;
|
|
}
|
|
}
|
|
|
|
public static class Double extends Line2D
|
|
{
|
|
double x1, y1, x2, y2;
|
|
|
|
public Double ()
|
|
{
|
|
this (0.0, 0.0, 0.0, 0.0);
|
|
}
|
|
|
|
public Double (double x1, double y1, double x2, double y2)
|
|
{
|
|
this.x1 = x1;
|
|
this.y1 = y1;
|
|
this.x2 = x2;
|
|
this.y2 = y2;
|
|
}
|
|
|
|
public Double (Point2D p1, Point2D p2)
|
|
{
|
|
this.x1 = (double) p1.getX ();
|
|
this.y1 = p1.getY ();
|
|
this.x2 = p2.getX ();
|
|
this.y2 = p2.getY ();
|
|
}
|
|
|
|
public Rectangle2D getBounds2D ()
|
|
{
|
|
double x = Math.min (x1, x2);
|
|
double w = Math.abs (x1 - x2);
|
|
double y = Math.min (y1, y2);
|
|
double h = Math.abs (y1 - y2);
|
|
return new Rectangle2D.Double (x, y, w, h);
|
|
}
|
|
|
|
public Point2D getP1 ()
|
|
{
|
|
return new Point2D.Double (x1, y1);
|
|
}
|
|
|
|
public Point2D getP2 ()
|
|
{
|
|
return new Point2D.Double (x2, y2);
|
|
}
|
|
|
|
public double getX1 ()
|
|
{
|
|
return x1;
|
|
}
|
|
|
|
public double getY1 ()
|
|
{
|
|
return y1;
|
|
}
|
|
|
|
public double getX2 ()
|
|
{
|
|
return x2;
|
|
}
|
|
|
|
public double getY2 ()
|
|
{
|
|
return y2;
|
|
}
|
|
|
|
public void setLine (double x1, double y1, double x2, double y2)
|
|
{
|
|
this.x1 = x1;
|
|
this.y1 = y1;
|
|
this.x2 = x2;
|
|
this.y2 = y2;
|
|
}
|
|
}
|
|
|
|
// This implements the PathIterator for all line objects that don't
|
|
// override getPathIterator.
|
|
private class Iterator implements PathIterator
|
|
{
|
|
// Current coordinate.
|
|
private int coord;
|
|
|
|
private static final int START = 0;
|
|
private static final int END_PLUS_ONE = 2;
|
|
|
|
public Iterator ()
|
|
{
|
|
coord = START;
|
|
}
|
|
|
|
public int currentSegment (double[] coords)
|
|
{
|
|
int r = SEG_MOVETO;
|
|
if (coord == 0)
|
|
{
|
|
coords[0] = getX1 ();
|
|
coords[1] = getY1 ();
|
|
}
|
|
else if (coord == 1)
|
|
{
|
|
coords[0] = getX2 ();
|
|
coords[1] = getY2 ();
|
|
}
|
|
else
|
|
r = SEG_CLOSE;
|
|
|
|
return r;
|
|
}
|
|
|
|
public int currentSegment (float[] coords)
|
|
{
|
|
int r = SEG_MOVETO;
|
|
if (coord == 0)
|
|
{
|
|
coords[0] = (float) getX1 ();
|
|
coords[1] = (float) getY1 ();
|
|
}
|
|
else if (coord == 1)
|
|
{
|
|
coords[0] = (float) getX2 ();
|
|
coords[1] = (float) getY2 ();
|
|
}
|
|
else
|
|
r = SEG_CLOSE;
|
|
|
|
return r;
|
|
}
|
|
|
|
public int getWindingRule ()
|
|
{
|
|
return WIND_NON_ZERO;
|
|
}
|
|
|
|
public boolean isDone ()
|
|
{
|
|
return coord == END_PLUS_ONE;
|
|
}
|
|
|
|
public void next ()
|
|
{
|
|
if (coord < END_PLUS_ONE)
|
|
++coord;
|
|
}
|
|
}
|
|
}
|