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author | Tom Tromey <tromey@redhat.com> | 2005-07-16 01:27:14 +0000 |
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committer | Tom Tromey <tromey@gcc.gnu.org> | 2005-07-16 01:27:14 +0000 |
commit | b0fa81eea9a270f23d6ad67ca7a6d25c18d20da1 (patch) | |
tree | 8762d1f992e2f725a6bde1ff966ed6f1e5f4f823 /libjava/java/awt/geom/Arc2D.java | |
parent | ea54b29342c8506acb4f858c68340c44b72e3532 (diff) | |
download | gcc-b0fa81eea9a270f23d6ad67ca7a6d25c18d20da1.zip gcc-b0fa81eea9a270f23d6ad67ca7a6d25c18d20da1.tar.gz gcc-b0fa81eea9a270f23d6ad67ca7a6d25c18d20da1.tar.bz2 |
Major merge with Classpath.
Removed many duplicate files.
* HACKING: Updated.x
* classpath: Imported new directory.
* standard.omit: New file.
* Makefile.in, aclocal.m4, configure: Rebuilt.
* sources.am: New file.
* configure.ac: Run Classpath configure script. Moved code around
to support. Disable xlib AWT peers (temporarily).
* Makefile.am (SUBDIRS): Added 'classpath'
(JAVAC): Removed.
(AM_CPPFLAGS): Added more -I options.
(BOOTCLASSPATH): Simplified.
Completely redid how sources are built.
Include sources.am.
* include/Makefile.am (tool_include__HEADERS): Removed jni.h.
* include/jni.h: Removed (in Classpath).
* scripts/classes.pl: Updated to look at built classes.
* scripts/makemake.tcl: New file.
* testsuite/libjava.jni/jni.exp (gcj_jni_compile_c_to_so): Added
-I options.
(gcj_jni_invocation_compile_c_to_binary): Likewise.
From-SVN: r102082
Diffstat (limited to 'libjava/java/awt/geom/Arc2D.java')
-rw-r--r-- | libjava/java/awt/geom/Arc2D.java | 1399 |
1 files changed, 0 insertions, 1399 deletions
diff --git a/libjava/java/awt/geom/Arc2D.java b/libjava/java/awt/geom/Arc2D.java deleted file mode 100644 index eff34a0..0000000 --- a/libjava/java/awt/geom/Arc2D.java +++ /dev/null @@ -1,1399 +0,0 @@ -/* Arc2D.java -- represents an arc in 2-D space - Copyright (C) 2002, 2003, 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; - -import java.util.NoSuchElementException; - - -/** - * This class represents all arcs (segments of an ellipse in 2-D space). The - * arcs are defined by starting angle and extent (arc length) in degrees, as - * opposed to radians (like the rest of Java), and can be open, chorded, or - * wedge shaped. The angles are skewed according to the ellipse, so that 45 - * degrees always points to the upper right corner (positive x, negative y) - * of the bounding rectangle. A positive extent draws a counterclockwise arc, - * and while the angle can be any value, the path iterator only traverses the - * first 360 degrees. Storage is up to the subclasses. - * - * @author Eric Blake (ebb9@email.byu.edu) - * @author Sven de Marothy (sven@physto.se) - * @since 1.2 - */ -public abstract class Arc2D extends RectangularShape -{ - /** - * An open arc, with no segment connecting the endpoints. This type of - * arc still contains the same points as a chorded version. - */ - public static final int OPEN = 0; - - /** - * A closed arc with a single segment connecting the endpoints (a chord). - */ - public static final int CHORD = 1; - - /** - * A closed arc with two segments, one from each endpoint, meeting at the - * center of the ellipse. - */ - public static final int PIE = 2; - - /** The closure type of this arc. This is package-private to avoid an - * accessor method. */ - int type; - - /** - * Create a new arc, with the specified closure type. - * - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE}. - * @throws IllegalArgumentException if type is invalid - */ - protected Arc2D(int type) - { - if (type < OPEN || type > PIE) - throw new IllegalArgumentException(); - this.type = type; - } - - /** - * Get the starting angle of the arc in degrees. - * - * @return the starting angle - * @see #setAngleStart(double) - */ - public abstract double getAngleStart(); - - /** - * Get the extent angle of the arc in degrees. - * - * @return the extent angle - * @see #setAngleExtent(double) - */ - public abstract double getAngleExtent(); - - /** - * Return the closure type of the arc. - * - * @return the closure type - * @see #OPEN - * @see #CHORD - * @see #PIE - * @see #setArcType(int) - */ - public int getArcType() - { - return type; - } - - /** - * Returns the starting point of the arc. - * - * @return the start point - */ - public Point2D getStartPoint() - { - double angle = Math.toRadians(getAngleStart()); - double rx = getWidth() / 2; - double ry = getHeight() / 2; - double x = getX() + rx + rx * Math.cos(angle); - double y = getY() + ry - ry * Math.sin(angle); - return new Point2D.Double(x, y); - } - - /** - * Returns the ending point of the arc. - * - * @return the end point - */ - public Point2D getEndPoint() - { - double angle = Math.toRadians(getAngleStart() + getAngleExtent()); - double rx = getWidth() / 2; - double ry = getHeight() / 2; - double x = getX() + rx + rx * Math.cos(angle); - double y = getY() + ry - ry * Math.sin(angle); - return new Point2D.Double(x, y); - } - - /** - * Set the parameters of the arc. The angles are in degrees, and a positive - * extent sweeps counterclockwise (from the positive x-axis to the negative - * y-axis). - * - * @param x the new x coordinate of the upper left of the bounding box - * @param y the new y coordinate of the upper left of the bounding box - * @param w the new width of the bounding box - * @param h the new height of the bounding box - * @param start the start angle, in degrees - * @param extent the arc extent, in degrees - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public abstract void setArc(double x, double y, double w, double h, - double start, double extent, int type); - - /** - * Set the parameters of the arc. The angles are in degrees, and a positive - * extent sweeps counterclockwise (from the positive x-axis to the negative - * y-axis). - * - * @param p the upper left point of the bounding box - * @param d the dimensions of the bounding box - * @param start the start angle, in degrees - * @param extent the arc extent, in degrees - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - * @throws NullPointerException if p or d is null - */ - public void setArc(Point2D p, Dimension2D d, double start, double extent, - int type) - { - setArc(p.getX(), p.getY(), d.getWidth(), d.getHeight(), start, extent, type); - } - - /** - * Set the parameters of the arc. The angles are in degrees, and a positive - * extent sweeps counterclockwise (from the positive x-axis to the negative - * y-axis). - * - * @param r the new bounding box - * @param start the start angle, in degrees - * @param extent the arc extent, in degrees - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - * @throws NullPointerException if r is null - */ - public void setArc(Rectangle2D r, double start, double extent, int type) - { - setArc(r.getX(), r.getY(), r.getWidth(), r.getHeight(), start, extent, type); - } - - /** - * Set the parameters of the arc from the given one. - * - * @param a the arc to copy - * @throws NullPointerException if a is null - */ - public void setArc(Arc2D a) - { - setArc(a.getX(), a.getY(), a.getWidth(), a.getHeight(), a.getAngleStart(), - a.getAngleExtent(), a.getArcType()); - } - - /** - * Set the parameters of the arc. The angles are in degrees, and a positive - * extent sweeps counterclockwise (from the positive x-axis to the negative - * y-axis). This controls the center point and radius, so the arc will be - * circular. - * - * @param x the x coordinate of the center of the circle - * @param y the y coordinate of the center of the circle - * @param r the radius of the circle - * @param start the start angle, in degrees - * @param extent the arc extent, in degrees - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public void setArcByCenter(double x, double y, double r, double start, - double extent, int type) - { - setArc(x - r, y - r, r + r, r + r, start, extent, type); - } - - /** - * Sets the parameters of the arc by finding the tangents of two lines, and - * using the specified radius. The arc will be circular, will begin on the - * tangent point of the line extending from p1 to p2, and will end on the - * tangent point of the line extending from p2 to p3. - * - * XXX What happens if the points are colinear, or the radius negative? - * - * @param p1 the first point - * @param p2 the tangent line intersection point - * @param p3 the third point - * @param r the radius of the arc - * @throws NullPointerException if any point is null - */ - public void setArcByTangent(Point2D p1, Point2D p2, Point2D p3, double r) - { - if ((p2.getX() - p1.getX()) * (p3.getY() - p1.getY()) - - (p3.getX() - p1.getX()) * (p2.getY() - p1.getY()) > 0) - { - Point2D p = p3; - p3 = p1; - p1 = p; - } - - // normalized tangent vectors - double dx1 = (p1.getX() - p2.getX()) / p1.distance(p2); - double dy1 = (p1.getY() - p2.getY()) / p1.distance(p2); - double dx2 = (p2.getX() - p3.getX()) / p3.distance(p2); - double dy2 = (p2.getY() - p3.getY()) / p3.distance(p2); - double theta1 = Math.atan2(dx1, dy1); - double theta2 = Math.atan2(dx2, dy2); - - double dx = r * Math.cos(theta2) - r * Math.cos(theta1); - double dy = -r * Math.sin(theta2) + r * Math.sin(theta1); - - if (theta1 < 0) - theta1 += 2 * Math.PI; - if (theta2 < 0) - theta2 += 2 * Math.PI; - if (theta2 < theta1) - theta2 += 2 * Math.PI; - - // Vectors of the lines, not normalized, note we change - // the direction of line 2. - dx1 = p1.getX() - p2.getX(); - dy1 = p1.getY() - p2.getY(); - dx2 = p3.getX() - p2.getX(); - dy2 = p3.getY() - p2.getY(); - - // Calculate the tangent point to the second line - double t2 = -(dx1 * dy - dy1 * dx) / (dx2 * dy1 - dx1 * dy2); - double x2 = t2 * (p3.getX() - p2.getX()) + p2.getX(); - double y2 = t2 * (p3.getY() - p2.getY()) + p2.getY(); - - // calculate the center point - double x = x2 - r * Math.cos(theta2); - double y = y2 + r * Math.sin(theta2); - - setArc(x - r, y - r, 2 * r, 2 * r, Math.toDegrees(theta1), - Math.toDegrees(theta2 - theta1), getArcType()); - } - - /** - * Set the start, in degrees. - * - * @param start the new start angle - * @see #getAngleStart() - */ - public abstract void setAngleStart(double start); - - /** - * Set the extent, in degrees. - * - * @param extent the new extent angle - * @see #getAngleExtent() - */ - public abstract void setAngleExtent(double extent); - - /** - * Sets the starting angle to the angle of the given point relative to - * the center of the arc. The extent remains constant; in other words, - * this rotates the arc. - * - * @param p the new start point - * @throws NullPointerException if p is null - * @see #getStartPoint() - * @see #getAngleStart() - */ - public void setAngleStart(Point2D p) - { - // Normalize. - double x = p.getX() - (getX() + getWidth() / 2); - double y = p.getY() - (getY() + getHeight() / 2); - setAngleStart(Math.toDegrees(Math.atan2(-y, x))); - } - - /** - * Sets the starting and extent angles to those of the given points - * relative to the center of the arc. The arc will be non-empty, and will - * extend counterclockwise. - * - * @param x1 the first x coordinate - * @param y1 the first y coordinate - * @param x2 the second x coordinate - * @param y2 the second y coordinate - * @see #setAngleStart(Point2D) - */ - public void setAngles(double x1, double y1, double x2, double y2) - { - // Normalize the points. - double mx = getX(); - double my = getY(); - double mw = getWidth(); - double mh = getHeight(); - x1 = x1 - (mx + mw / 2); - y1 = y1 - (my + mh / 2); - x2 = x2 - (mx + mw / 2); - y2 = y2 - (my + mh / 2); - double start = Math.toDegrees(Math.atan2(-y1, x1)); - double extent = Math.toDegrees(Math.atan2(-y2, x2)) - start; - if (extent < 0) - extent += 360; - setAngleStart(start); - setAngleExtent(extent); - } - - /** - * Sets the starting and extent angles to those of the given points - * relative to the center of the arc. The arc will be non-empty, and will - * extend counterclockwise. - * - * @param p1 the first point - * @param p2 the second point - * @throws NullPointerException if either point is null - * @see #setAngleStart(Point2D) - */ - public void setAngles(Point2D p1, Point2D p2) - { - setAngles(p1.getX(), p1.getY(), p2.getX(), p2.getY()); - } - - /** - * Set the closure type of this arc. - * - * @param type one of {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - * @see #getArcType() - */ - public void setArcType(int type) - { - if (type < OPEN || type > PIE) - throw new IllegalArgumentException(); - this.type = type; - } - - /** - * Sets the location and bounds of the ellipse of which this arc is a part. - * - * @param x the new x coordinate - * @param y the new y coordinate - * @param w the new width - * @param h the new height - * @see #getFrame() - */ - public void setFrame(double x, double y, double w, double h) - { - setArc(x, y, w, h, getAngleStart(), getAngleExtent(), type); - } - - /** - * Gets the bounds of the arc. This is much tighter than - * <code>getBounds</code>, as it takes into consideration the start and - * end angles, and the center point of a pie wedge, rather than just the - * overall ellipse. - * - * @return the bounds of the arc - * @see #getBounds() - */ - public Rectangle2D getBounds2D() - { - double extent = getAngleExtent(); - if (Math.abs(extent) >= 360) - return makeBounds(getX(), getY(), getWidth(), getHeight()); - - // Find the minimal bounding box. This determined by its extrema, - // which are the center, the endpoints of the arc, and any local - // maximum contained by the arc. - double rX = getWidth() / 2; - double rY = getHeight() / 2; - double centerX = getX() + rX; - double centerY = getY() + rY; - - Point2D p1 = getStartPoint(); - Rectangle2D result = makeBounds(p1.getX(), p1.getY(), 0, 0); - result.add(getEndPoint()); - - if (type == PIE) - result.add(centerX, centerY); - if (containsAngle(0)) - result.add(centerX + rX, centerY); - if (containsAngle(90)) - result.add(centerX, centerY - rY); - if (containsAngle(180)) - result.add(centerX - rX, centerY); - if (containsAngle(270)) - result.add(centerX, centerY + rY); - - return result; - } - - /** - * Construct a bounding box in a precision appropriate for the subclass. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - * @return the rectangle for use in getBounds2D - */ - protected abstract Rectangle2D makeBounds(double x, double y, double w, - double h); - - /** - * Tests if the given angle, in degrees, is included in the arc. - * All angles are normalized to be between 0 and 360 degrees. - * - * @param a the angle to test - * @return true if it is contained - */ - public boolean containsAngle(double a) - { - double start = getAngleStart(); - double extent = getAngleExtent(); - double end = start + extent; - - if (extent == 0) - return false; - - if (extent >= 360 || extent <= -360) - return true; - - if (extent < 0) - { - end = start; - start += extent; - } - - start %= 360; - while (start < 0) - start += 360; - - end %= 360; - while (end < start) - end += 360; - - a %= 360; - while (a < start) - a += 360; - - return a >= start && a < end; // starting angle included, ending angle not - } - - /** - * Determines if the arc contains the given point. If the bounding box - * is empty, then this will return false. - * - * The area considered 'inside' an arc of type OPEN is the same as the - * area inside an equivalent filled CHORD-type arc. The area considered - * 'inside' a CHORD-type arc is the same as the filled area. - * - * @param x the x coordinate to test - * @param y the y coordinate to test - * @return true if the point is inside the arc - */ - public boolean contains(double x, double y) - { - double w = getWidth(); - double h = getHeight(); - double extent = getAngleExtent(); - if (w <= 0 || h <= 0 || extent == 0) - return false; - - double mx = getX() + w / 2; - double my = getY() + h / 2; - double dx = (x - mx) * 2 / w; - double dy = (y - my) * 2 / h; - if ((dx * dx + dy * dy) >= 1.0) - return false; - - double angle = Math.toDegrees(Math.atan2(-dy, dx)); - if (getArcType() == PIE) - return containsAngle(angle); - - double a1 = Math.toRadians(getAngleStart()); - double a2 = Math.toRadians(getAngleStart() + extent); - double x1 = mx + getWidth() * Math.cos(a1) / 2; - double y1 = my - getHeight() * Math.sin(a1) / 2; - double x2 = mx + getWidth() * Math.cos(a2) / 2; - double y2 = my - getHeight() * Math.sin(a2) / 2; - double sgn = ((x2 - x1) * (my - y1) - (mx - x1) * (y2 - y1)) * ((x2 - x1) * (y - - y1) - (x - x1) * (y2 - y1)); - - if (Math.abs(extent) > 180) - { - if (containsAngle(angle)) - return true; - return sgn > 0; - } - else - { - if (! containsAngle(angle)) - return false; - return sgn < 0; - } - } - - /** - * Tests if a given rectangle intersects the area of the arc. - * - * For a definition of the 'inside' area, see the contains() method. - * @see #contains(double, double) - * - * @param x the x coordinate of the rectangle - * @param y the y coordinate of the rectangle - * @param w the width of the rectangle - * @param h the height of the rectangle - * @return true if the two shapes share common points - */ - public boolean intersects(double x, double y, double w, double h) - { - double extent = getAngleExtent(); - if (extent == 0) - return false; - - if (contains(x, y) || contains(x, y + h) || contains(x + w, y) - || contains(x + w, y + h)) - return true; - - Rectangle2D rect = new Rectangle2D.Double(x, y, w, h); - - double a = getWidth() / 2.0; - double b = getHeight() / 2.0; - - double mx = getX() + a; - double my = getY() + b; - double x1 = mx + a * Math.cos(Math.toRadians(getAngleStart())); - double y1 = my - b * Math.sin(Math.toRadians(getAngleStart())); - double x2 = mx + a * Math.cos(Math.toRadians(getAngleStart() + extent)); - double y2 = my - b * Math.sin(Math.toRadians(getAngleStart() + extent)); - - if (getArcType() != CHORD) - { - // check intersections against the pie radii - if (rect.intersectsLine(mx, my, x1, y1)) - return true; - if (rect.intersectsLine(mx, my, x2, y2)) - return true; - } - else// check the chord - if (rect.intersectsLine(x1, y1, x2, y2)) - return true; - - // Check the Arc segment against the four edges - double dx; - - // Check the Arc segment against the four edges - double dy; - dy = y - my; - dx = a * Math.sqrt(1 - ((dy * dy) / (b * b))); - if (! java.lang.Double.isNaN(dx)) - { - if (mx + dx >= x && mx + dx <= x + w - && containsAngle(Math.toDegrees(Math.atan2(-dy, dx)))) - return true; - if (mx - dx >= x && mx - dx <= x + w - && containsAngle(Math.toDegrees(Math.atan2(-dy, -dx)))) - return true; - } - dy = (y + h) - my; - dx = a * Math.sqrt(1 - ((dy * dy) / (b * b))); - if (! java.lang.Double.isNaN(dx)) - { - if (mx + dx >= x && mx + dx <= x + w - && containsAngle(Math.toDegrees(Math.atan2(-dy, dx)))) - return true; - if (mx - dx >= x && mx - dx <= x + w - && containsAngle(Math.toDegrees(Math.atan2(-dy, -dx)))) - return true; - } - dx = x - mx; - dy = b * Math.sqrt(1 - ((dx * dx) / (a * a))); - if (! java.lang.Double.isNaN(dy)) - { - if (my + dy >= y && my + dy <= y + h - && containsAngle(Math.toDegrees(Math.atan2(-dy, dx)))) - return true; - if (my - dy >= y && my - dy <= y + h - && containsAngle(Math.toDegrees(Math.atan2(dy, dx)))) - return true; - } - - dx = (x + w) - mx; - dy = b * Math.sqrt(1 - ((dx * dx) / (a * a))); - if (! java.lang.Double.isNaN(dy)) - { - if (my + dy >= y && my + dy <= y + h - && containsAngle(Math.toDegrees(Math.atan2(-dy, dx)))) - return true; - if (my - dy >= y && my - dy <= y + h - && containsAngle(Math.toDegrees(Math.atan2(dy, dx)))) - return true; - } - - // Check whether the arc is contained within the box - if (rect.contains(mx, my)) - return true; - - return false; - } - - /** - * Tests if a given rectangle is contained in the area of the arc. - * - * @param x the x coordinate of the rectangle - * @param y the y coordinate of the rectangle - * @param w the width of the rectangle - * @param h the height of the rectangle - * @return true if the arc contains the rectangle - */ - public boolean contains(double x, double y, double w, double h) - { - double extent = getAngleExtent(); - if (extent == 0) - return false; - - if (! (contains(x, y) && contains(x, y + h) && contains(x + w, y) - && contains(x + w, y + h))) - return false; - - Rectangle2D rect = new Rectangle2D.Double(x, y, w, h); - - double a = getWidth() / 2.0; - double b = getHeight() / 2.0; - - double mx = getX() + a; - double my = getY() + b; - double x1 = mx + a * Math.cos(Math.toRadians(getAngleStart())); - double y1 = my - b * Math.sin(Math.toRadians(getAngleStart())); - double x2 = mx + a * Math.cos(Math.toRadians(getAngleStart() + extent)); - double y2 = my - b * Math.sin(Math.toRadians(getAngleStart() + extent)); - if (getArcType() != CHORD) - { - // check intersections against the pie radii - if (rect.intersectsLine(mx, my, x1, y1)) - return false; - - if (rect.intersectsLine(mx, my, x2, y2)) - return false; - } - else if (rect.intersectsLine(x1, y1, x2, y2)) - return false; - return true; - } - - /** - * Tests if a given rectangle is contained in the area of the arc. - * - * @param r the rectangle - * @return true if the arc contains the rectangle - */ - public boolean contains(Rectangle2D r) - { - return contains(r.getX(), r.getY(), r.getWidth(), r.getHeight()); - } - - /** - * Returns an iterator over this arc, with an optional transformation. - * This iterator is threadsafe, so future modifications to the arc do not - * affect the iteration. - * - * @param at the transformation, or null - * @return a path iterator - */ - public PathIterator getPathIterator(AffineTransform at) - { - return new ArcIterator(this, at); - } - - /** - * This class is used to iterate over an arc. Since ellipses are a subclass - * of arcs, this is used by Ellipse2D as well. - * - * @author Eric Blake (ebb9@email.byu.edu) - */ - static final class ArcIterator implements PathIterator - { - /** The current iteration. */ - private int current; - - /** The last iteration. */ - private final int limit; - - /** The optional transformation. */ - private final AffineTransform xform; - - /** The x coordinate of the bounding box. */ - private final double x; - - /** The y coordinate of the bounding box. */ - private final double y; - - /** The width of the bounding box. */ - private final double w; - - /** The height of the bounding box. */ - private final double h; - - /** The start angle, in radians (not degrees). */ - private final double start; - - /** The extent angle, in radians (not degrees). */ - private final double extent; - - /** The arc closure type. */ - private final int type; - - /** - * Construct a new iterator over an arc. - * - * @param a the arc - * @param xform the transform - */ - public ArcIterator(Arc2D a, AffineTransform xform) - { - this.xform = xform; - x = a.getX(); - y = a.getY(); - w = a.getWidth(); - h = a.getHeight(); - double start = a.getAngleStart() * (Math.PI / 180); - double extent = a.getAngleExtent() * (Math.PI / 180); - - if (extent < 0) - { - extent = -extent; - start = 2 * Math.PI - extent + start; - } - this.start = start; - this.extent = extent; - - type = a.type; - if (w < 0 || h < 0) - limit = -1; - else if (extent == 0) - limit = type; - else if (extent <= Math.PI / 2.0) - limit = type + 1; - else if (extent <= Math.PI) - limit = type + 2; - else if (extent <= 3.0 * (Math.PI / 2.0)) - limit = type + 3; - else - limit = type + 4; - } - - /** - * Construct a new iterator over an ellipse. - * - * @param e the ellipse - * @param xform the transform - */ - public ArcIterator(Ellipse2D e, AffineTransform xform) - { - this.xform = xform; - x = e.getX(); - y = e.getY(); - w = e.getWidth(); - h = e.getHeight(); - start = 0; - extent = 2 * Math.PI; - type = CHORD; - limit = (w < 0 || h < 0) ? -1 : 5; - } - - /** - * Return the winding rule. - * - * @return {@link PathIterator#WIND_NON_ZERO} - */ - public int getWindingRule() - { - return WIND_NON_ZERO; - } - - /** - * Test if the iteration is complete. - * - * @return true if more segments exist - */ - public boolean isDone() - { - return current > limit; - } - - /** - * Advance the iterator. - */ - public void next() - { - current++; - } - - /** - * Put the current segment into the array, and return the segment type. - * - * @param coords an array of 6 elements - * @return the segment type - * @throws NullPointerException if coords is null - * @throws ArrayIndexOutOfBoundsException if coords is too small - */ - public int currentSegment(float[] coords) - { - double[] double_coords = new double[6]; - int code = currentSegment(double_coords); - for (int i = 0; i < 6; ++i) - coords[i] = (float) double_coords[i]; - return code; - } - - /** - * Put the current segment into the array, and return the segment type. - * - * @param coords an array of 6 elements - * @return the segment type - * @throws NullPointerException if coords is null - * @throws ArrayIndexOutOfBoundsException if coords is too small - */ - public int currentSegment(double[] coords) - { - double rx = w / 2; - double ry = h / 2; - double xmid = x + rx; - double ymid = y + ry; - - if (current > limit) - throw new NoSuchElementException("arc iterator out of bounds"); - - if (current == 0) - { - coords[0] = xmid + rx * Math.cos(start); - coords[1] = ymid - ry * Math.sin(start); - if (xform != null) - xform.transform(coords, 0, coords, 0, 1); - return SEG_MOVETO; - } - - if (type != OPEN && current == limit) - return SEG_CLOSE; - - if ((current == limit - 1) && (type == PIE)) - { - coords[0] = xmid; - coords[1] = ymid; - if (xform != null) - xform.transform(coords, 0, coords, 0, 1); - return SEG_LINETO; - } - - // note that this produces a cubic approximation of the arc segment, - // not a true ellipsoid. there's no ellipsoid path segment code, - // unfortunately. the cubic approximation looks about right, though. - double kappa = (Math.sqrt(2.0) - 1.0) * (4.0 / 3.0); - double quad = (Math.PI / 2.0); - - double curr_begin = start + (current - 1) * quad; - double curr_extent = Math.min((start + extent) - curr_begin, quad); - double portion_of_a_quadrant = curr_extent / quad; - - double x0 = xmid + rx * Math.cos(curr_begin); - double y0 = ymid - ry * Math.sin(curr_begin); - - double x1 = xmid + rx * Math.cos(curr_begin + curr_extent); - double y1 = ymid - ry * Math.sin(curr_begin + curr_extent); - - AffineTransform trans = new AffineTransform(); - double[] cvec = new double[2]; - double len = kappa * portion_of_a_quadrant; - double angle = curr_begin; - - // in a hypothetical "first quadrant" setting, our first control - // vector would be sticking up, from [1,0] to [1,kappa]. - // - // let us recall however that in java2d, y coords are upside down - // from what one would consider "normal" first quadrant rules, so we - // will *subtract* the y value of this control vector from our first - // point. - cvec[0] = 0; - cvec[1] = len; - trans.scale(rx, ry); - trans.rotate(angle); - trans.transform(cvec, 0, cvec, 0, 1); - coords[0] = x0 + cvec[0]; - coords[1] = y0 - cvec[1]; - - // control vector #2 would, ideally, be sticking out and to the - // right, in a first quadrant arc segment. again, subtraction of y. - cvec[0] = 0; - cvec[1] = -len; - trans.rotate(curr_extent); - trans.transform(cvec, 0, cvec, 0, 1); - coords[2] = x1 + cvec[0]; - coords[3] = y1 - cvec[1]; - - // end point - coords[4] = x1; - coords[5] = y1; - - if (xform != null) - xform.transform(coords, 0, coords, 0, 3); - - return SEG_CUBICTO; - } - } // class ArcIterator - - /** - * This class implements an arc in double precision. - * - * @author Eric Blake (ebb9@email.byu.edu) - * @since 1.2 - */ - public static class Double extends Arc2D - { - /** The x coordinate of the box bounding the ellipse of this arc. */ - public double x; - - /** The y coordinate of the box bounding the ellipse of this arc. */ - public double y; - - /** The width of the box bounding the ellipse of this arc. */ - public double width; - - /** The height of the box bounding the ellipse of this arc. */ - public double height; - - /** The start angle of this arc, in degrees. */ - public double start; - - /** The extent angle of this arc, in degrees. */ - public double extent; - - /** - * Create a new, open arc at (0,0) with 0 extent. - */ - public Double() - { - super(OPEN); - } - - /** - * Create a new arc of the given type at (0,0) with 0 extent. - * - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public Double(int type) - { - super(type); - } - - /** - * Create a new arc with the given dimensions. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public Double(double x, double y, double w, double h, double start, - double extent, int type) - { - super(type); - this.x = x; - this.y = y; - width = w; - height = h; - this.start = start; - this.extent = extent; - } - - /** - * Create a new arc with the given dimensions. - * - * @param r the bounding box - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - * @throws NullPointerException if r is null - */ - public Double(Rectangle2D r, double start, double extent, int type) - { - super(type); - x = r.getX(); - y = r.getY(); - width = r.getWidth(); - height = r.getHeight(); - this.start = start; - this.extent = extent; - } - - /** - * Return the x coordinate of the bounding box. - * - * @return the value of x - */ - public double getX() - { - return x; - } - - /** - * Return the y coordinate of the bounding box. - * - * @return the value of y - */ - public double getY() - { - return y; - } - - /** - * Return the width of the bounding box. - * - * @return the value of width - */ - public double getWidth() - { - return width; - } - - /** - * Return the height of the bounding box. - * - * @return the value of height - */ - public double getHeight() - { - return height; - } - - /** - * Return the start angle of the arc, in degrees. - * - * @return the value of start - */ - public double getAngleStart() - { - return start; - } - - /** - * Return the extent of the arc, in degrees. - * - * @return the value of extent - */ - public double getAngleExtent() - { - return extent; - } - - /** - * Tests if the arc contains points. - * - * @return true if the arc has no interior - */ - public boolean isEmpty() - { - return width <= 0 || height <= 0; - } - - /** - * Sets the arc to the given dimensions. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public void setArc(double x, double y, double w, double h, double start, - double extent, int type) - { - this.x = x; - this.y = y; - width = w; - height = h; - this.start = start; - this.extent = extent; - setArcType(type); - } - - /** - * Sets the start angle of the arc. - * - * @param start the new start angle - */ - public void setAngleStart(double start) - { - this.start = start; - } - - /** - * Sets the extent angle of the arc. - * - * @param extent the new extent angle - */ - public void setAngleExtent(double extent) - { - this.extent = extent; - } - - /** - * Creates a tight bounding box given dimensions that more precise than - * the bounding box of the ellipse. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - */ - protected Rectangle2D makeBounds(double x, double y, double w, double h) - { - return new Rectangle2D.Double(x, y, w, h); - } - } // class Double - - /** - * This class implements an arc in float precision. - * - * @author Eric Blake (ebb9@email.byu.edu) - * @since 1.2 - */ - public static class Float extends Arc2D - { - /** The x coordinate of the box bounding the ellipse of this arc. */ - public float x; - - /** The y coordinate of the box bounding the ellipse of this arc. */ - public float y; - - /** The width of the box bounding the ellipse of this arc. */ - public float width; - - /** The height of the box bounding the ellipse of this arc. */ - public float height; - - /** The start angle of this arc, in degrees. */ - public float start; - - /** The extent angle of this arc, in degrees. */ - public float extent; - - /** - * Create a new, open arc at (0,0) with 0 extent. - */ - public Float() - { - super(OPEN); - } - - /** - * Create a new arc of the given type at (0,0) with 0 extent. - * - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public Float(int type) - { - super(type); - } - - /** - * Create a new arc with the given dimensions. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public Float(float x, float y, float w, float h, float start, - float extent, int type) - { - super(type); - this.x = x; - this.y = y; - width = w; - height = h; - this.start = start; - this.extent = extent; - } - - /** - * Create a new arc with the given dimensions. - * - * @param r the bounding box - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - * @throws NullPointerException if r is null - */ - public Float(Rectangle2D r, float start, float extent, int type) - { - super(type); - x = (float) r.getX(); - y = (float) r.getY(); - width = (float) r.getWidth(); - height = (float) r.getHeight(); - this.start = start; - this.extent = (float) extent; - } - - /** - * Return the x coordinate of the bounding box. - * - * @return the value of x - */ - public double getX() - { - return x; - } - - /** - * Return the y coordinate of the bounding box. - * - * @return the value of y - */ - public double getY() - { - return y; - } - - /** - * Return the width of the bounding box. - * - * @return the value of width - */ - public double getWidth() - { - return width; - } - - /** - * Return the height of the bounding box. - * - * @return the value of height - */ - public double getHeight() - { - return height; - } - - /** - * Return the start angle of the arc, in degrees. - * - * @return the value of start - */ - public double getAngleStart() - { - return start; - } - - /** - * Return the extent of the arc, in degrees. - * - * @return the value of extent - */ - public double getAngleExtent() - { - return extent; - } - - /** - * Tests if the arc contains points. - * - * @return true if the arc has no interior - */ - public boolean isEmpty() - { - return width <= 0 || height <= 0; - } - - /** - * Sets the arc to the given dimensions. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - * @param start the start angle, in degrees - * @param extent the extent, in degrees - * @param type the arc type: {@link #OPEN}, {@link #CHORD}, or {@link #PIE} - * @throws IllegalArgumentException if type is invalid - */ - public void setArc(double x, double y, double w, double h, double start, - double extent, int type) - { - this.x = (float) x; - this.y = (float) y; - width = (float) w; - height = (float) h; - this.start = (float) start; - this.extent = (float) extent; - setArcType(type); - } - - /** - * Sets the start angle of the arc. - * - * @param start the new start angle - */ - public void setAngleStart(double start) - { - this.start = (float) start; - } - - /** - * Sets the extent angle of the arc. - * - * @param extent the new extent angle - */ - public void setAngleExtent(double extent) - { - this.extent = (float) extent; - } - - /** - * Creates a tight bounding box given dimensions that more precise than - * the bounding box of the ellipse. - * - * @param x the x coordinate - * @param y the y coordinate - * @param w the width - * @param h the height - */ - protected Rectangle2D makeBounds(double x, double y, double w, double h) - { - return new Rectangle2D.Float((float) x, (float) y, (float) w, (float) h); - } - } // class Float -} // class Arc2D |