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-/* Ellipse2D.java -- represents an ellipse in 2-D space
- Copyright (C) 2000, 2002, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 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;
-
-
-/**
- * Ellipse2D is the shape of an ellipse.
- * <BR>
- * <img src="doc-files/Ellipse-1.png" width="347" height="221"
- * alt="A drawing of an ellipse" /><BR>
- * The ellipse is defined by it's bounding box (shown in red),
- * and is defined by the implicit curve:<BR>
- * <blockquote>(<i>x</i>/<i>a</i>)<sup>2</sup> +
- * (<i>y</i>/<i>b</i>)<sup>2</sup> = 1<BR><BR></blockquote>
- *
- * @author Tom Tromey (tromey@cygnus.com)
- * @author Eric Blake (ebb9@email.byu.edu)
- *
- * @since 1.2
- */
-public abstract class Ellipse2D extends RectangularShape
-{
- /**
- * Ellipse2D is defined as abstract.
- * Implementing classes are Ellipse2D.Float and Ellipse2D.Double.
- */
- protected Ellipse2D()
- {
- }
-
- /**
- * Determines if a point is contained within the ellipse. <P>
- * @param x - x coordinate of the point.
- * @param y - y coordinate of the point.
- * @return true if the point is within the ellipse, false otherwise.
- */
- public boolean contains(double x, double y)
- {
- double rx = getWidth() / 2;
- double ry = getHeight() / 2;
- double tx = (x - (getX() + rx)) / rx;
- double ty = (y - (getY() + ry)) / ry;
- return tx * tx + ty * ty < 1.0;
- }
-
- /**
- * Determines if a rectangle is completely contained within the
- * ellipse. <P>
- * @param x - x coordinate of the upper-left corner of the rectangle
- * @param y - y coordinate of the upper-left corner of the rectangle
- * @param w - width of the rectangle
- * @param h - height of the rectangle
- * @return true if the rectangle is completely contained, false otherwise.
- */
- public boolean contains(double x, double y, double w, double h)
- {
- double x2 = x + w;
- double y2 = y + h;
- return (contains(x, y) && contains(x, y2) && contains(x2, y)
- && contains(x2, y2));
- }
-
- /**
- * Returns a PathIterator object corresponding to the ellipse.<P>
- *
- * Note: An ellipse cannot be represented exactly in PathIterator
- * segments, the outline is thefore approximated with cubic
- * Bezier segments.
- *
- * @param at an optional transform.
- * @return A path iterator.
- */
- public PathIterator getPathIterator(AffineTransform at)
- {
- // An ellipse is just a complete arc.
- return new Arc2D.ArcIterator(this, at);
- }
-
- /**
- * Determines if a rectangle intersects any part of the ellipse.<P>
- * @param x - x coordinate of the upper-left corner of the rectangle
- * @param y - y coordinate of the upper-left corner of the rectangle
- * @param w - width of the rectangle
- * @param h - height of the rectangle
- * @return true if the rectangle intersects the ellipse, false otherwise.
- */
- public boolean intersects(double x, double y, double w, double h)
- {
- Rectangle2D r = new Rectangle2D.Double(x, y, w, h);
- if (! r.intersects(getX(), getY(), getWidth(), getHeight()))
- return false;
-
- if (contains(x, y) || contains(x, y + h) || contains(x + w, y)
- || contains(x + w, y + h))
- return true;
-
- Line2D l1 = new Line2D.Double(getX(), getY() + (getHeight() / 2),
- getX() + getWidth(),
- getY() + (getHeight() / 2));
- Line2D l2 = new Line2D.Double(getX() + (getWidth() / 2), getY(),
- getX() + (getWidth() / 2),
- getY() + getHeight());
-
- if (l1.intersects(r) || l2.intersects(r))
- return true;
-
- return false;
- }
-
- /**
- * An {@link Ellipse2D} that stores its coordinates using <code>double</code>
- * primitives.
- */
- public static class Double extends Ellipse2D
- {
- /**
- * The height of the ellipse.
- */
- public double height;
-
- /**
- * The width of the ellipse.
- */
- public double width;
-
- /**
- * The upper-left x coordinate of the bounding-box
- */
- public double x;
-
- /**
- * The upper-left y coordinate of the bounding-box
- */
- public double y;
-
- /**
- * Creates a new Ellipse2D with an upper-left coordinate of (0,0)
- * and a zero size.
- */
- public Double()
- {
- }
-
- /**
- * Creates a new Ellipse2D within a given rectangle
- * using double-precision coordinates.<P>
- * @param x - x coordinate of the upper-left of the bounding rectangle
- * @param y - y coordinate of the upper-left of the bounding rectangle
- * @param w - width of the ellipse
- * @param h - height of the ellipse
- */
- public Double(double x, double y, double w, double h)
- {
- this.x = x;
- this.y = y;
- height = h;
- width = w;
- }
-
- /**
- * Returns the bounding-box of the ellipse.
- * @return The bounding box.
- */
- public Rectangle2D getBounds2D()
- {
- return new Rectangle2D.Double(x, y, width, height);
- }
-
- /**
- * Returns the height of the ellipse.
- * @return The height of the ellipse.
- */
- public double getHeight()
- {
- return height;
- }
-
- /**
- * Returns the width of the ellipse.
- * @return The width of the ellipse.
- */
- public double getWidth()
- {
- return width;
- }
-
- /**
- * Returns x coordinate of the upper-left corner of
- * the ellipse's bounding-box.
- * @return The x coordinate.
- */
- public double getX()
- {
- return x;
- }
-
- /**
- * Returns y coordinate of the upper-left corner of
- * the ellipse's bounding-box.
- * @return The y coordinate.
- */
- public double getY()
- {
- return y;
- }
-
- /**
- * Returns <code>true</code> if the ellipse encloses no area, and
- * <code>false</code> otherwise.
- *
- * @return A boolean.
- */
- public boolean isEmpty()
- {
- return height <= 0 || width <= 0;
- }
-
- /**
- * Sets the geometry of the ellipse's bounding box.<P>
- *
- * @param x - x coordinate of the upper-left of the bounding rectangle
- * @param y - y coordinate of the upper-left of the bounding rectangle
- * @param w - width of the ellipse
- * @param h - height of the ellipse
- */
- public void setFrame(double x, double y, double w, double h)
- {
- this.x = x;
- this.y = y;
- height = h;
- width = w;
- }
- } // class Double
-
- /**
- * An {@link Ellipse2D} that stores its coordinates using <code>float</code>
- * primitives.
- */
- public static class Float extends Ellipse2D
- {
- /**
- * The height of the ellipse.
- */
- public float height;
-
- /**
- * The width of the ellipse.
- */
- public float width;
-
- /**
- * The upper-left x coordinate of the bounding-box
- */
- public float x;
-
- /**
- * The upper-left y coordinate of the bounding-box
- */
- public float y;
-
- /**
- * Creates a new Ellipse2D with an upper-left coordinate of (0,0)
- * and a zero size.
- */
- public Float()
- {
- }
-
- /**
- * Creates a new Ellipse2D within a given rectangle
- * using floating-point precision.<P>
- * @param x - x coordinate of the upper-left of the bounding rectangle
- * @param y - y coordinate of the upper-left of the bounding rectangle
- * @param w - width of the ellipse
- * @param h - height of the ellipse
- *
- */
- public Float(float x, float y, float w, float h)
- {
- this.x = x;
- this.y = y;
- this.height = h;
- this.width = w;
- }
-
- /**
- * Returns the bounding-box of the ellipse.
- * @return The bounding box.
- */
- public Rectangle2D getBounds2D()
- {
- return new Rectangle2D.Float(x, y, width, height);
- }
-
- /**
- * Returns the height of the ellipse.
- * @return The height of the ellipse.
- */
- public double getHeight()
- {
- return height;
- }
-
- /**
- * Returns the width of the ellipse.
- * @return The width of the ellipse.
- */
- public double getWidth()
- {
- return width;
- }
-
- /**
- * Returns x coordinate of the upper-left corner of
- * the ellipse's bounding-box.
- * @return The x coordinate.
- */
- public double getX()
- {
- return x;
- }
-
- /**
- * Returns y coordinate of the upper-left corner of
- * the ellipse's bounding-box.
- * @return The y coordinate.
- */
- public double getY()
- {
- return y;
- }
-
- /**
- * Returns <code>true</code> if the ellipse encloses no area, and
- * <code>false</code> otherwise.
- *
- * @return A boolean.
- */
- public boolean isEmpty()
- {
- return height <= 0 || width <= 0;
- }
-
- /**
- * Sets the geometry of the ellipse's bounding box.<P>
- *
- * @param x - x coordinate of the upper-left of the bounding rectangle
- * @param y - y coordinate of the upper-left of the bounding rectangle
- * @param w - width of the ellipse
- * @param h - height of the ellipse
- */
- public void setFrame(float x, float y, float w, float h)
- {
- this.x = x;
- this.y = y;
- height = h;
- width = w;
- }
-
- /**
- * Sets the geometry of the ellipse's bounding box.
- *
- * Note: This leads to a loss of precision.<P>
- *
- * @param x - x coordinate of the upper-left of the bounding rectangle
- * @param y - y coordinate of the upper-left of the bounding rectangle
- * @param w - width of the ellipse
- * @param h - height of the ellipse
- */
- public void setFrame(double x, double y, double w, double h)
- {
- this.x = (float) x;
- this.y = (float) y;
- height = (float) h;
- width = (float) w;
- }
- } // class Float
-} // class Ellipse2D
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