805 lines
24 KiB
Java
805 lines
24 KiB
Java
/* Graphics.java -- Abstract Java drawing class
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Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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import java.awt.image.ImageObserver;
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/**
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* This is the abstract superclass of classes for drawing to graphics
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* devices such as the screen or printers.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Warren Levy <warrenl@cygnus.com>
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*/
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public abstract class Graphics
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{
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/*
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* Instance Variables
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*/
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Default constructor for subclasses.
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*/
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protected
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Graphics()
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{
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* Returns a copy of this <code>Graphics</code> object.
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*
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* @return A copy of this object.
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*/
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public abstract Graphics
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create();
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/*************************************************************************/
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/**
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* Returns a copy of this <code>Graphics</code> object. The origin point
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* will be translated to the point (x, y) and the cliping rectangle set
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* to the intersection of the clipping rectangle in this object and the
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* rectangle specified by the parameters to this method.
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*
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* @param x The new X coordinate of the clipping region rect.
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* @param y The new Y coordinate of the clipping region rect.
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* @param width The width of the clipping region intersect rectangle.
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* @param height The height of the clipping region intersect rectangle.
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*
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* @return A copy of this object, modified as specified.
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*/
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public Graphics
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create(int x, int y, int width, int height)
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{
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Graphics g = create();
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g.translate(x, y);
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// FIXME: I'm not sure if this will work. Are the old clip rect bounds
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// translated above?
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g.clipRect(0, 0, width, height);
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return(g);
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}
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/*************************************************************************/
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/**
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* Translates this context so that its new origin point is the point
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* (x, y).
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*
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* @param x The new X coordinate of the origin.
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* @param y The new Y coordinate of the origin.
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*/
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public abstract void
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translate(int x, int y);
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/*************************************************************************/
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/**
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* Returns the current color for this object.
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*
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* @return The color for this object.
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*/
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public abstract Color
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getColor();
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/*************************************************************************/
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/**
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* Sets the current color for this object.
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*
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* @param color The new color.
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*/
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public abstract void
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setColor(Color color);
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/*************************************************************************/
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/**
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* Sets this context into "paint" mode, where the target pixels are
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* completely overwritten when drawn on.
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*/
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public abstract void
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setPaintMode();
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/*************************************************************************/
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/**
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* Sets this context info "XOR" mode, where the targe pixles are
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* XOR-ed when drawn on.
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*
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* @param color The color to XOR against.
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*/
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public abstract void
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setXORMode(Color color);
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/*************************************************************************/
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/**
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* Returns the current font for this graphics context.
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*
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* @return The current font.
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*/
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public abstract Font
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getFont();
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/*************************************************************************/
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/**
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* Sets the font for this graphics context to the specified value.
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*
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* @param font The new font.
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*/
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public abstract void
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setFont(Font font);
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/*************************************************************************/
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/**
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* Returns the font metrics for the current font.
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*
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* @return The font metrics for the current font.
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*/
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public FontMetrics
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getFontMetrics()
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{
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return(getFontMetrics(getFont()));
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}
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/*************************************************************************/
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/**
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* Returns the font metrics for the specified font.
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*
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* @param font The font to return metrics for.
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*
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* @return The requested font metrics.
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*/
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public abstract FontMetrics
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getFontMetrics(Font font);
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/*************************************************************************/
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/**
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* Returns the bounding rectangle of the clipping region for this
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* graphics context.
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*
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* @return The bounding rectangle for the clipping region.
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*/
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public abstract Rectangle
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getClipBounds();
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/*************************************************************************/
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/**
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* Returns the bounding rectangle of the clipping region for this
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* graphics context.
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*
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* @return The bounding rectangle for the clipping region.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getClipBounds()</code>.
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*/
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public Rectangle
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getClipRect()
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{
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return(getClipBounds());
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}
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/*************************************************************************/
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/**
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* Sets the clipping region to the intersection of the current clipping
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* region and the rectangle determined by the specified parameters.
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*
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* @param x The X coordinate of the upper left corner of the intersect rect.
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* @param Y The Y coordinate of the upper left corner of the intersect rect.
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* @param width The width of the intersect rect.
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* @param height The height of the intersect rect.
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*/
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public abstract void
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clipRect(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Sets the clipping region to the rectangle determined by the specified
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* parameters.
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*
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* @param x The X coordinate of the upper left corner of the rect.
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* @param y The Y coordinate of the upper left corner of the rect.
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* @param width The width of the rect.
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* @param height The height of the rect.
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*/
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public abstract void
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setClip(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Returns the current clipping region as a <code>Shape</code> object.
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*
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* @return The clipping region as a <code>Shape</code>.
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*/
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public abstract Shape
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getClip();
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/*************************************************************************/
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/**
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* Sets the clipping region to the specified <code>Shape</code>.
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*
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* @param shape The new clipping region.
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*/
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public abstract void
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setClip(Shape clip);
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/*************************************************************************/
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/**
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* Copies the specified rectangle to the specified offset location.
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*
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* @param x The X coordinate of the upper left corner of the copy rect.
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* @param y The Y coordinate of the upper left corner of the copy rect.
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* @param width The width of the copy rect.
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* @param height The height of the copy rect.
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* @param dx The offset from the X value to start drawing.
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* @param dy The offset from the Y value to start drawing.
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*/
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public abstract void
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copyArea(int x, int y, int width, int height, int dx, int dy);
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/*************************************************************************/
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/**
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* Draws a line between the two specified points.
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*
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* @param x1 The X coordinate of the first point.
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* @param y1 The Y coordinate of the first point.
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* @param x2 The X coordinate of the second point.
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* @param y2 The Y coordinate of the second point.
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*/
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public abstract void
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drawLine(int x1, int y1, int x2, int y2);
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/*************************************************************************/
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/**
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* Fills the area bounded by the specified rectangle.
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*
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* @param x The X coordinate of the upper left corner of the fill rect.
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* @param y The Y coordinate of the upper left corner of the fill rect.
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* @param width The width of the fill rect.
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* @param height The height of the fill rect.
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*/
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public abstract void
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fillRect(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Draws the outline of the specified rectangle.
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*
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* @param x The X coordinate of the upper left corner of the draw rect.
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* @param y The Y coordinate of the upper left corner of the draw rect.
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* @param width The width of the draw rect.
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* @param height The height of the draw rect.
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*/
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public void
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drawRect(int x, int y, int width, int height)
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{
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int x1 = x;
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int y1 = y;
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int x2 = x + width;
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int y2 = y + height;
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drawLine(x1, y1, x2, y1);
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drawLine(x2, y1, x2, y2);
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drawLine(x2, y2, x1, y2);
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drawLine(x1, y2, x1, y1);
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}
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/*************************************************************************/
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/**
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* Clears the specified rectangle.
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*
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* @param x The X coordinate of the upper left corner of the clear rect.
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* @param y The Y coordinate of the upper left corner of the clear rect.
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* @param width The width of the clear rect.
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* @param height The height of the clear rect.
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*/
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public abstract void
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clearRect(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Draws the outline of the specified rectangle with rounded cornders.
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*
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* @param x The X coordinate of the upper left corner of the draw rect.
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* @param y The Y coordinate of the upper left corner of the draw rect.
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* @param width The width of the draw rect.
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* @param height The height of the draw rect.
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* @param arcWidth The width of the corner arcs.
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* @param arcHeigth The height of the corner arcs.
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*/
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public abstract void
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drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight);
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/*************************************************************************/
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/**
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* Fills the specified rectangle with rounded cornders.
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*
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* @param x The X coordinate of the upper left corner of the fill rect.
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* @param y The Y coordinate of the upper left corner of the fill rect.
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* @param width The width of the fill rect.
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* @param height The height of the fill rect.
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* @param arcWidth The width of the corner arcs.
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* @param arcHeigth The height of the corner arcs.
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*/
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public abstract void
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fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight);
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/*************************************************************************/
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public void
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draw3DRect(int x, int y, int width, int height, boolean raised)
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{
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Color color = getColor();
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Color tl = color.brighter();
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Color br = color.darker();
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if (!raised)
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{
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Color tmp = tl;
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tl = br;
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br = tmp;
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}
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int x1 = x;
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int y1 = y;
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int x2 = x + width;
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int y2 = y + height;
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setColor(tl);
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drawLine(x1, y1, x2, y1);
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drawLine(x1, y2, x1, y1);
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setColor(br);
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drawLine(x2, y1, x2, y2);
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drawLine(x2, y1, x1, y2);
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setColor(color);
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}
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/**
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* Fills the specified rectangle with a 3D effect
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*
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* @param x The X coordinate of the upper left corner of the fill rect.
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* @param y The Y coordinate of the upper left corner of the fill rect.
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* @param width The width of the fill rect.
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* @param height The height of the fill rect.
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* @param raised <code>true</code> if the rectangle appears raised,
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* <code>false</code> if it should appear etched.
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*/
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public void
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fill3DRect(int x, int y, int width, int height, boolean raised)
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{
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fillRect(x, y, width, height);
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draw3DRect(x, y, width-1, height-1, raised);
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}
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/*************************************************************************/
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/**
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* Draws the outline of the specified rectangle with a 3D effect
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*
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* @param x The X coordinate of the upper left corner of the draw rect.
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* @param y The Y coordinate of the upper left corner of the draw rect.
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* @param width The width of the draw rect.
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* @param height The height of the draw rect.
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* @param raised <code>true</code> if the rectangle appears raised,
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* <code>false</code> if it should appear etched.
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*/
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public void
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drawRoundRect(int x, int y, int width, int height, boolean raised)
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{
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// FIXME: ???
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}
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/*************************************************************************/
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/**
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* Draws an oval that just fits within the specified rectangle.
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*
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* @param x The X coordinate of the upper left corner of the rect.
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* @param y The Y coordinate of the upper left corner of the rect.
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* @param width The width of the rect.
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* @param height The height of the rect.
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*/
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public abstract void
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drawOval(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Fills an oval that just fits within the specified rectangle.
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*
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* @param x The X coordinate of the upper left corner of the rect.
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* @param y The Y coordinate of the upper left corner of the rect.
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* @param width The width of the rect.
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* @param height The height of the rect.
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*/
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public abstract void
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fillOval(int x, int y, int width, int height);
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/*************************************************************************/
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/**
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* Draws an arc using the specified bounding rectangle and the specified
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* angle parameter. The arc is centered at the center of the rectangle.
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* The arc starts at the arcAngle position and extend for arcAngle
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* degrees. The degree origin is at the 3 o'clock position.
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*
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* @param x The X coordinate of the upper left corner of the rect.
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* @param y The Y coordinate of the upper left corner of the rect.
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* @param width The width of the rect.
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* @param height The height of the rect.
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* @param arcStart The beginning angle of the arc.
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* @param arcAngle The extent of the arc.
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*/
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public abstract void
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drawArc(int x, int y, int width, int height, int startAngle, int arcAngle);
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/*************************************************************************/
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/**
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* Fills the arc define by the specified bounding rectangle and the specified
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* angle parameter. The arc is centered at the center of the rectangle.
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* The arc starts at the arcAngle position and extend for arcAngle
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* degrees. The degree origin is at the 3 o'clock position.
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*
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* @param x The X coordinate of the upper left corner of the rect.
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* @param y The Y coordinate of the upper left corner of the rect.
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* @param width The width of the rect.
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* @param height The height of the rect.
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* @param arcStart The beginning angle of the arc.
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* @param arcAngle The extent of the arc.
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*/
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public abstract void
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fillArc(int x, int y, int width, int height, int startAngle, int arcAngle);
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/*************************************************************************/
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/**
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* Draws a series of interconnected lines determined by the arrays
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* of corresponding x and y coordinates.
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*
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* @param xPoints The X coordinate array.
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* @param yPoints The Y coordinate array.
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* @param npoints The number of points to draw.
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*/
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public abstract void
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drawPolyline(int xPoints[], int yPoints[], int npoints);
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/*************************************************************************/
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/**
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* Draws a series of interconnected lines determined by the arrays
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* of corresponding x and y coordinates. The figure is closed if necessary
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* by connecting the first and last points.
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*
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* @param xPoints The X coordinate array.
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* @param yPoints The Y coordinate array.
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* @param npoints The number of points to draw.
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*/
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public abstract void
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drawPolygon(int xPoints[], int yPoints[], int npoints);
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/*************************************************************************/
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/**
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* Draws the specified polygon.
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*
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* @param polygon The polygon to draw.
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*/
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public void
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drawPolygon(Polygon polygon)
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{
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drawPolygon(polygon.xpoints, polygon.ypoints, polygon.npoints);
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}
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/*************************************************************************/
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/**
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* Fills the polygon determined by the arrays
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* of corresponding x and y coordinates.
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*
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* @param xPoints The X coordinate array.
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* @param yPoints The Y coordinate array.
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* @param npoints The number of points to draw.
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*/
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public abstract void
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fillPolygon(int xPoints[], int yPoints[], int npoints);
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/*************************************************************************/
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/**
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* Fills the specified polygon
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*
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* @param polygon The polygon to fill.
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*/
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public void
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fillPolygon(Polygon polygon)
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{
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fillPolygon(polygon.xpoints, polygon.ypoints, polygon.npoints);
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}
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/*************************************************************************/
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/**
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* Draws the specified string starting at the specified point.
|
|
*
|
|
* @param string The string to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
*/
|
|
public abstract void
|
|
drawString(String string, int x, int y);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws the specified characters starting at the specified point.
|
|
*
|
|
* @param data The array of characters to draw.
|
|
* @param offset The offset into the array to start drawing characters from.
|
|
* @param length The number of characters to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
*/
|
|
public void
|
|
drawChars(char data[], int offset, int length, int x, int y)
|
|
{
|
|
drawString(new String(data, offset, length), x, y);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws the specified bytes as text starting at the specified point.
|
|
*
|
|
* @param data The array of bytes to draw.
|
|
* @param offset The offset into the array to start drawing bytes from.
|
|
* @param length The number of bytes to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
*/
|
|
public void
|
|
drawChars(byte data[], int offset, int length, int x, int y)
|
|
{
|
|
drawString(new String(data, offset, length), x, y);
|
|
}
|
|
|
|
/*
|
|
public abstract void drawString(AttributedCharacterIterator iterator,
|
|
int x, int y)
|
|
*/
|
|
|
|
public void
|
|
drawBytes(byte[] data, int offset, int length, int x, int y)
|
|
{
|
|
String str = new String(data, offset, length);
|
|
drawString(str, x, y);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws all of the image that is available and returns. If the image
|
|
* is not completely loaded, <code>false</code> is returned and
|
|
* the specified iamge observer is notified as more data becomes
|
|
* available.
|
|
*
|
|
* @param image The image to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
* @param observer The image observer to notify as data becomes available.
|
|
*
|
|
* @return <code>true</code> if all the image data is available,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int x, int y, ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws all of the image that is available and returns. The image
|
|
* is scaled to fit in the specified rectangle. If the image
|
|
* is not completely loaded, <code>false</code> is returned and
|
|
* the specified iamge observer is notified as more data becomes
|
|
* available.
|
|
*
|
|
* @param image The image to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
* @param width The width of the rectangle to draw in.
|
|
* @param height The height of the rectangle to draw in.
|
|
* @param observer The image observer to notify as data becomes available.
|
|
*
|
|
* @return <code>true</code> if all the image data is available,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int x, int y, int width, int height,
|
|
ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws all of the image that is available and returns. If the image
|
|
* is not completely loaded, <code>false</code> is returned and
|
|
* the specified iamge observer is notified as more data becomes
|
|
* available.
|
|
*
|
|
* @param image The image to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
* @param bgcolor The background color to use for the image.
|
|
* @param observer The image observer to notify as data becomes available.
|
|
*
|
|
* @return <code>true</code> if all the image data is available,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int x, int y, Color bgcolor, ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Draws all of the image that is available and returns. The image
|
|
* is scaled to fit in the specified rectangle. If the image
|
|
* is not completely loaded, <code>false</code> is returned and
|
|
* the specified iamge observer is notified as more data becomes
|
|
* available.
|
|
*
|
|
* @param image The image to draw.
|
|
* @param x The X coordinate of the point to draw at.
|
|
* @param y The Y coordinate of the point to draw at.
|
|
* @param width The width of the rectangle to draw in.
|
|
* @param height The height of the rectangle to draw in.
|
|
* @param bgcolor The background color to use for the image.
|
|
* @param observer The image observer to notify as data becomes available.
|
|
*
|
|
* @return <code>true</code> if all the image data is available,
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int x, int y, int width, int height, Color bgcolor,
|
|
ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* FIXME: Write Javadocs for this when you understand it.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1,
|
|
int sx2, int sy2, ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* FIXME: Write Javadocs for this when you understand it.
|
|
*/
|
|
public abstract boolean
|
|
drawImage(Image image, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1,
|
|
int sx2, int sy2, Color bgcolor, ImageObserver observer);
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Free any resources held by this graphics context immediately instead
|
|
* of waiting for the object to be garbage collected and finalized.
|
|
*/
|
|
public abstract void
|
|
dispose();
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Frees the resources held by this graphics context when it is
|
|
* garbage collected.
|
|
*/
|
|
public void
|
|
finalize()
|
|
{
|
|
dispose();
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns a string representation of this object.
|
|
*
|
|
* @param A string representation of this object.
|
|
*/
|
|
public String
|
|
toString()
|
|
{
|
|
return(super.toString());
|
|
}
|
|
|
|
public boolean
|
|
hitClip(int x, int y, int width, int height)
|
|
{
|
|
throw new UnsupportedOperationException("not implemented yet");
|
|
}
|
|
|
|
public Rectangle
|
|
getClipBounds(Rectangle r)
|
|
{
|
|
Rectangle clipBounds = getClipBounds();
|
|
|
|
if (r == null)
|
|
return clipBounds;
|
|
|
|
r.x = clipBounds.x;
|
|
r.y = clipBounds.y;
|
|
r.width = clipBounds.width;
|
|
r.height = clipBounds.height;
|
|
return r;
|
|
}
|
|
|
|
} // class Graphics
|
|
|