| /* RoundRectangle2D.java -- represents a rectangle with rounded corners |
| Copyright (C) 2000, 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 implements a rectangle with rounded corners. |
| * @author Tom Tromey (tromey@cygnus.com) |
| * @date December 3, 2000 |
| */ |
| public abstract class RoundRectangle2D extends RectangularShape |
| { |
| /** Return the arc height of this round rectangle. */ |
| public abstract double getArcHeight(); |
| |
| /** Return the arc width of this round rectangle. */ |
| public abstract double getArcWidth(); |
| |
| /** Set the values of this round rectangle |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| * @param arcWidth The arc width |
| * @param arcHeight The arc height |
| */ |
| public abstract void setRoundRect(double x, double y, double w, double h, |
| double arcWidth, double arcHeight); |
| |
| /** Create a RoundRectangle2D. This is protected because this class |
| * is abstract and cannot be instantiated. |
| */ |
| protected RoundRectangle2D() |
| { |
| } |
| |
| /** Return true if this object contains the specified point. |
| * @param x The x coordinate |
| * @param y The y coordinate |
| */ |
| public boolean contains(double x, double y) |
| { |
| double mx = getX(); |
| double mw = getWidth(); |
| if (x < mx || x >= mx + mw) |
| return false; |
| double my = getY(); |
| double mh = getHeight(); |
| if (y < my || y >= my + mh) |
| return false; |
| |
| // Now check to see if the point is in range of an arc. |
| double dy = Math.min(Math.abs(my - y), Math.abs(my + mh - y)); |
| double dx = Math.min(Math.abs(mx - x), Math.abs(mx + mw - x)); |
| |
| // The arc dimensions are that of the corresponding ellipse |
| // thus a 90 degree segment is half of that. |
| double aw = getArcWidth() / 2.0; |
| double ah = getArcHeight() / 2.0; |
| if (dx > aw || dy > ah) |
| return true; |
| |
| // At this point DX represents the distance from the nearest edge |
| // of the rectangle. But we want to transform it to represent the |
| // scaled distance from the center of the ellipse that forms the |
| // arc. Hence this code: |
| dy = (ah - dy) / ah; |
| dx = (aw - dx) / aw; |
| |
| return dx * dx + dy * dy <= 1.0; |
| } |
| |
| /** Return true if this object contains the specified rectangle |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| */ |
| public boolean contains(double x, double y, double w, double h) |
| { |
| // We have to check all four points here (for ordinary rectangles |
| // we can just check opposing corners). |
| return (contains(x, y) && contains(x, y + h) && contains(x + w, y + h) |
| && contains(x + w, y)); |
| } |
| |
| /** Return a new path iterator which iterates over this rectangle. |
| * @param at An affine transform to apply to the object |
| */ |
| public PathIterator getPathIterator(final AffineTransform at) |
| { |
| final double minx = getX(); |
| final double miny = getY(); |
| final double maxx = minx + getWidth(); |
| final double maxy = miny + getHeight(); |
| final double arcwidth = getArcWidth(); |
| final double archeight = getArcHeight(); |
| return new PathIterator() |
| { |
| /** We iterate counterclockwise around the rectangle, starting in the |
| * upper right. This variable tracks our current point, which |
| * can be on either side of a given corner. */ |
| private int current = 0; |
| |
| /** Child path iterator, used for corners. */ |
| private PathIterator corner; |
| |
| /** This is used when rendering the corners. We re-use the arc |
| * for each corner. */ |
| private Arc2D arc = new Arc2D.Double(); |
| |
| /** Temporary array used by getPoint. */ |
| private double[] temp = new double[2]; |
| |
| public int getWindingRule() |
| { |
| return WIND_NON_ZERO; |
| } |
| |
| public boolean isDone() |
| { |
| return current > 9; |
| } |
| |
| private void getPoint(int val) |
| { |
| switch (val) |
| { |
| case 0: |
| case 8: |
| temp[0] = maxx; |
| temp[1] = miny + archeight; |
| break; |
| case 7: |
| temp[0] = maxx; |
| temp[1] = maxy - archeight; |
| break; |
| case 6: |
| temp[0] = maxx - arcwidth; |
| temp[1] = maxy; |
| break; |
| case 5: |
| temp[0] = minx + arcwidth; |
| temp[1] = maxy; |
| break; |
| case 4: |
| temp[0] = minx; |
| temp[1] = maxy - archeight; |
| break; |
| case 3: |
| temp[0] = minx; |
| temp[1] = miny + archeight; |
| break; |
| case 2: |
| temp[0] = minx + arcwidth; |
| temp[1] = miny; |
| break; |
| case 1: |
| temp[0] = maxx - arcwidth; |
| temp[1] = miny; |
| break; |
| } |
| } |
| |
| public void next() |
| { |
| if (current >= 8) |
| ++current; |
| else if (corner != null) |
| { |
| // We're iterating through the corner. Work on the child |
| // iterator; if it finishes, reset and move to the next |
| // point along the rectangle. |
| corner.next(); |
| if (corner.isDone()) |
| { |
| corner = null; |
| ++current; |
| } |
| } |
| else |
| { |
| // Make an arc between this point on the rectangle and |
| // the next one, and then iterate over this arc. |
| getPoint(current); |
| double x1 = temp[0]; |
| double y1 = temp[1]; |
| getPoint(current + 1); |
| Rectangle2D.Double r = new Rectangle2D.Double(Math.min(x1, |
| temp[0]), |
| Math.min(y1, |
| temp[1]), |
| Math.abs(x1 |
| - temp[0]), |
| Math.abs(y1 |
| - temp[1])); |
| arc.setArc(r, (current >> 1) * 90.0, 90.0, Arc2D.OPEN); |
| corner = arc.getPathIterator(at); |
| } |
| } |
| |
| public int currentSegment(float[] coords) |
| { |
| if (corner != null) |
| { |
| int r = corner.currentSegment(coords); |
| if (r == SEG_MOVETO) |
| r = SEG_LINETO; |
| return r; |
| } |
| |
| if (current < 9) |
| { |
| getPoint(current); |
| coords[0] = (float) temp[0]; |
| coords[1] = (float) temp[1]; |
| } |
| else if (current == 9) |
| return SEG_CLOSE; |
| else |
| throw new NoSuchElementException("rect iterator out of bounds"); |
| |
| if (at != null) |
| at.transform(coords, 0, coords, 0, 1); |
| return current == 0 ? SEG_MOVETO : SEG_LINETO; |
| } |
| |
| public int currentSegment(double[] coords) |
| { |
| if (corner != null) |
| { |
| int r = corner.currentSegment(coords); |
| if (r == SEG_MOVETO) |
| r = SEG_LINETO; |
| return r; |
| } |
| |
| if (current < 9) |
| { |
| getPoint(current); |
| coords[0] = temp[0]; |
| coords[1] = temp[1]; |
| } |
| else if (current == 9) |
| return SEG_CLOSE; |
| else |
| throw new NoSuchElementException("rect iterator out of bounds"); |
| |
| if (at != null) |
| at.transform(coords, 0, coords, 0, 1); |
| return current == 0 ? SEG_MOVETO : SEG_LINETO; |
| } |
| }; |
| } |
| |
| /** Return true if the given rectangle intersects this shape. |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| */ |
| public boolean intersects(double x, double y, double w, double h) |
| { |
| // Check if any corner is within the rectangle |
| return (contains(x, y) || contains(x, y + h) || contains(x + w, y + h) |
| || contains(x + w, y)); |
| } |
| |
| /** Set the boundary of this round rectangle. |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| */ |
| public void setFrame(double x, double y, double w, double h) |
| { |
| // This is a bit lame. |
| setRoundRect(x, y, w, h, getArcWidth(), getArcHeight()); |
| } |
| |
| /** Set the values of this round rectangle to be the same as those |
| * of the argument. |
| * @param rr The round rectangle to copy |
| */ |
| public void setRoundRect(RoundRectangle2D rr) |
| { |
| setRoundRect(rr.getX(), rr.getY(), rr.getWidth(), rr.getHeight(), |
| rr.getArcWidth(), rr.getArcHeight()); |
| } |
| |
| /** A subclass of RoundRectangle which keeps its parameters as |
| * doubles. */ |
| public static class Double extends RoundRectangle2D |
| { |
| /** The height of the corner arc. */ |
| public double archeight; |
| |
| /** The width of the corner arc. */ |
| public double arcwidth; |
| |
| /** The x coordinate of this object. */ |
| public double x; |
| |
| /** The y coordinate of this object. */ |
| public double y; |
| |
| /** The width of this object. */ |
| public double width; |
| |
| /** The height of this object. */ |
| public double height; |
| |
| /** Construct a new instance, with all parameters set to 0. */ |
| public Double() |
| { |
| } |
| |
| /** Construct a new instance with the given arguments. |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| * @param arcWidth The arc width |
| * @param arcHeight The arc height |
| */ |
| public Double(double x, double y, double w, double h, double arcWidth, |
| double arcHeight) |
| { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| this.arcwidth = arcWidth; |
| this.archeight = arcHeight; |
| } |
| |
| public double getArcHeight() |
| { |
| return archeight; |
| } |
| |
| public double getArcWidth() |
| { |
| return arcwidth; |
| } |
| |
| public Rectangle2D getBounds2D() |
| { |
| return new Rectangle2D.Double(x, y, width, height); |
| } |
| |
| public double getX() |
| { |
| return x; |
| } |
| |
| public double getY() |
| { |
| return y; |
| } |
| |
| public double getWidth() |
| { |
| return width; |
| } |
| |
| public double getHeight() |
| { |
| return height; |
| } |
| |
| public boolean isEmpty() |
| { |
| return width <= 0 || height <= 0; |
| } |
| |
| public void setRoundRect(double x, double y, double w, double h, |
| double arcWidth, double arcHeight) |
| { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| this.arcwidth = arcWidth; |
| this.archeight = arcHeight; |
| } |
| } // class Double |
| |
| /** A subclass of RoundRectangle which keeps its parameters as |
| * floats. */ |
| public static class Float extends RoundRectangle2D |
| { |
| /** The height of the corner arc. */ |
| public float archeight; |
| |
| /** The width of the corner arc. */ |
| public float arcwidth; |
| |
| /** The x coordinate of this object. */ |
| public float x; |
| |
| /** The y coordinate of this object. */ |
| public float y; |
| |
| /** The width of this object. */ |
| public float width; |
| |
| /** The height of this object. */ |
| public float height; |
| |
| /** Construct a new instance, with all parameters set to 0. */ |
| public Float() |
| { |
| } |
| |
| /** Construct a new instance with the given arguments. |
| * @param x The x coordinate |
| * @param y The y coordinate |
| * @param w The width |
| * @param h The height |
| * @param arcWidth The arc width |
| * @param arcHeight The arc height |
| */ |
| public Float(float x, float y, float w, float h, float arcWidth, |
| float arcHeight) |
| { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| this.arcwidth = arcWidth; |
| this.archeight = arcHeight; |
| } |
| |
| public double getArcHeight() |
| { |
| return archeight; |
| } |
| |
| public double getArcWidth() |
| { |
| return arcwidth; |
| } |
| |
| public Rectangle2D getBounds2D() |
| { |
| return new Rectangle2D.Float(x, y, width, height); |
| } |
| |
| public double getX() |
| { |
| return x; |
| } |
| |
| public double getY() |
| { |
| return y; |
| } |
| |
| public double getWidth() |
| { |
| return width; |
| } |
| |
| public double getHeight() |
| { |
| return height; |
| } |
| |
| public boolean isEmpty() |
| { |
| return width <= 0 || height <= 0; |
| } |
| |
| public void setRoundRect(float x, float y, float w, float h, |
| float arcWidth, float arcHeight) |
| { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| this.arcwidth = arcWidth; |
| this.archeight = arcHeight; |
| } |
| |
| public void setRoundRect(double x, double y, double w, double h, |
| double arcWidth, double arcHeight) |
| { |
| this.x = (float) x; |
| this.y = (float) y; |
| this.width = (float) w; |
| this.height = (float) h; |
| this.arcwidth = (float) arcWidth; |
| this.archeight = (float) arcHeight; |
| } |
| } // class Float |
| } // class RoundRectangle2D |