/* * Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package java.awt; import java.io.*;import java.lang.*;import java.util.*;import java.awt.image.ImageObserver;import java.text.AttributedCharacterIterator; /** * The <code>Graphics</code> class is the abstract base class for * all graphics contexts that allow an application to draw onto * components that are realized on various devices, as well as * onto off-screen images. * <p> * A <code>Graphics</code> object encapsulates state information needed * for the basic rendering operations that Java supports. This * state information includes the following properties: * <p> * <ul> * <li>The <code>Component</code> object on which to draw. * <li>A translation origin for rendering and clipping coordinates. * <li>The current clip. * <li>The current color. * <li>The current font. * <li>The current logical pixel operation function (XOR or Paint). * <li>The current XOR alternation color * (see {@link Graphics#setXORMode}). * </ul> * <p> * Coordinates are infinitely thin and lie between the pixels of the * output device. * Operations that draw the outline of a figure operate by traversing * an infinitely thin path between pixels with a pixel-sized pen that hangs * down and to the right of the anchor point on the path. * Operations that fill a figure operate by filling the interior * of that infinitely thin path. * Operations that render horizontal text render the ascending * portion of character glyphs entirely above the baseline coordinate. * <p> * The graphics pen hangs down and to the right from the path it traverses. * This has the following implications: * <p><ul> * <li>If you draw a figure that covers a given rectangle, that * figure occupies one extra row of pixels on the right and bottom edges * as compared to filling a figure that is bounded by that same rectangle. * <li>If you draw a horizontal line along the same <i>y</i> coordinate as * the baseline of a line of text, that line is drawn entirely below * the text, except for any descenders. * </ul><p> * All coordinates that appear as arguments to the methods of this * <code>Graphics</code> object are considered relative to the * translation origin of this <code>Graphics</code> object prior to * the invocation of the method. * <p> * All rendering operations modify only pixels which lie within the * area bounded by the current clip, which is specified by a {@link Shape} * in user space and is controlled by the program using the * <code>Graphics</code> object. This <i>user clip</i> * is transformed into device space and combined with the * <i>device clip</i>, which is defined by the visibility of windows and * device extents. The combination of the user clip and device clip * defines the <i>composite clip</i>, which determines the final clipping * region. The user clip cannot be modified by the rendering * system to reflect the resulting composite clip. The user clip can only * be changed through the <code>setClip</code> or <code>clipRect</code> * methods. * All drawing or writing is done in the current color, * using the current paint mode, and in the current font. * * @author Sami Shaio * @author Arthur van Hoff * @see java.awt.Component * @see java.awt.Graphics#clipRect(int, int, int, int) * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode() * @see java.awt.Graphics#setXORMode(java.awt.Color) * @see java.awt.Graphics#setFont(java.awt.Font) * @since JDK1.0 */public abstract class Graphics { /** * Constructs a new <code>Graphics</code> object. * This constructor is the default contructor for a graphics * context. * <p> * Since <code>Graphics</code> is an abstract class, applications * cannot call this constructor directly. Graphics contexts are * obtained from other graphics contexts or are created by calling * <code>getGraphics</code> on a component. * @see java.awt.Graphics#create() * @see java.awt.Component#getGraphics */ protected Graphics() { } /** * Creates a new <code>Graphics</code> object that is * a copy of this <code>Graphics</code> object. * @return a new graphics context that is a copy of * this graphics context. */ public abstract Graphics create(); /** * Creates a new <code>Graphics</code> object based on this * <code>Graphics</code> object, but with a new translation and clip area. * The new <code>Graphics</code> object has its origin * translated to the specified point (<i>x</i>, <i>y</i>). * Its clip area is determined by the intersection of the original * clip area with the specified rectangle. The arguments are all * interpreted in the coordinate system of the original * <code>Graphics</code> object. The new graphics context is * identical to the original, except in two respects: * <p> * <ul> * <li> * The new graphics context is translated by (<i>x</i>, <i>y</i>). * That is to say, the point (<code>0</code>, <code>0</code>) in the * new graphics context is the same as (<i>x</i>, <i>y</i>) in * the original graphics context. * <li> * The new graphics context has an additional clipping rectangle, in * addition to whatever (translated) clipping rectangle it inherited * from the original graphics context. The origin of the new clipping * rectangle is at (<code>0</code>, <code>0</code>), and its size * is specified by the <code>width</code> and <code>height</code> * arguments. * </ul> * <p> * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. * @param width the width of the clipping rectangle. * @param height the height of the clipping rectangle. * @return a new graphics context. * @see java.awt.Graphics#translate * @see java.awt.Graphics#clipRect */ public Graphics create(int x, int y, int width, int height) { Graphics g = create(); if (g == null) return null; g.translate(x, y); g.clipRect(0, 0, width, height); return g; } /** * Translates the origin of the graphics context to the point * (<i>x</i>, <i>y</i>) in the current coordinate system. * Modifies this graphics context so that its new origin corresponds * to the point (<i>x</i>, <i>y</i>) in this graphics context's * original coordinate system. All coordinates used in subsequent * rendering operations on this graphics context will be relative * to this new origin. * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. */ public abstract void translate(int x, int y); /** * Gets this graphics context's current color. * @return this graphics context's current color. * @see java.awt.Color * @see java.awt.Graphics#setColor(Color) */ public abstract Color getColor(); /** * Sets this graphics context's current color to the specified * color. All subsequent graphics operations using this graphics * context use this specified color. * @param c the new rendering color. * @see java.awt.Color * @see java.awt.Graphics#getColor */ public abstract void setColor(Color c); /** * Sets the paint mode of this graphics context to overwrite the * destination with this graphics context's current color. * This sets the logical pixel operation function to the paint or * overwrite mode. All subsequent rendering operations will * overwrite the destination with the current color. */ public abstract void setPaintMode(); /** * Sets the paint mode of this graphics context to alternate between * this graphics context's current color and the new specified color. * This specifies that logical pixel operations are performed in the * XOR mode, which alternates pixels between the current color and * a specified XOR color. * <p> * When drawing operations are performed, pixels which are the * current color are changed to the specified color, and vice versa. * <p> * Pixels that are of colors other than those two colors are changed * in an unpredictable but reversible manner; if the same figure is * drawn twice, then all pixels are restored to their original values. * @param c1 the XOR alternation color */ public abstract void setXORMode(Color c1); /** * Gets the current font. * @return this graphics context's current font. * @see java.awt.Font * @see java.awt.Graphics#setFont(Font) */ public abstract Font getFont(); /** * Sets this graphics context's font to the specified font. * All subsequent text operations using this graphics context * use this font. A null argument is silently ignored. * @param font the font. * @see java.awt.Graphics#getFont * @see java.awt.Graphics#drawString(java.lang.String, int, int) * @see java.awt.Graphics#drawBytes(byte[], int, int, int, int) * @see java.awt.Graphics#drawChars(char[], int, int, int, int) */ public abstract void setFont(Font font); /** * Gets the font metrics of the current font. * @return the font metrics of this graphics * context's current font. * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics(Font) */ public FontMetrics getFontMetrics() { return getFontMetrics(getFont()); } /** * Gets the font metrics for the specified font. * @return the font metrics for the specified font. * @param f the specified font * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics() */ public abstract FontMetrics getFontMetrics(Font f); /** * Returns the bounding rectangle of the current clipping area. * This method refers to the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using <code>setClip(null)</code>, this method returns * <code>null</code>. * The coordinates in the rectangle are relative to the coordinate * system origin of this graphics context. * @return the bounding rectangle of the current clipping area, * or <code>null</code> if no clip is set. * @see java.awt.Graphics#getClip * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Rectangle getClipBounds(); /** * Intersects the current clip with the specified rectangle. * The resulting clipping area is the intersection of the current * clipping area and the specified rectangle. If there is no * current clipping area, either because the clip has never been * set, or the clip has been cleared using <code>setClip(null)</code>, * the specified rectangle becomes the new clip. * This method sets the user clip, which is independent of the * clipping associated with device bounds and window visibility. * This method can only be used to make the current clip smaller. * To set the current clip larger, use any of the setClip methods. * Rendering operations have no effect outside of the clipping area. * @param x the x coordinate of the rectangle to intersect the clip with * @param y the y coordinate of the rectangle to intersect the clip with * @param width the width of the rectangle to intersect the clip with * @param height the height of the rectangle to intersect the clip with * @see #setClip(int, int, int, int) * @see #setClip(Shape) */ public abstract void clipRect(int x, int y, int width, int height); /** * Sets the current clip to the rectangle specified by the given * coordinates. This method sets the user clip, which is * independent of the clipping associated with device bounds * and window visibility. * Rendering operations have no effect outside of the clipping area. * @param x the <i>x</i> coordinate of the new clip rectangle. * @param y the <i>y</i> coordinate of the new clip rectangle. * @param width the width of the new clip rectangle. * @param height the height of the new clip rectangle. * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(Shape) * @see java.awt.Graphics#getClip * @since JDK1.1 */ public abstract void setClip(int x, int y, int width, int height); /** * Gets the current clipping area. * This method returns the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using <code>setClip(null)</code>, this method returns * <code>null</code>. * @return a <code>Shape</code> object representing the * current clipping area, or <code>null</code> if * no clip is set. * @see java.awt.Graphics#getClipBounds * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Shape getClip(); /** * Sets the current clipping area to an arbitrary clip shape. * Not all objects that implement the <code>Shape</code> * interface can be used to set the clip. The only * <code>Shape</code> objects that are guaranteed to be * supported are <code>Shape</code> objects that are * obtained via the <code>getClip</code> method and via * <code>Rectangle</code> objects. This method sets the * user clip, which is independent of the clipping associated * with device bounds and window visibility. * @param clip the <code>Shape</code> to use to set the clip * @see java.awt.Graphics#getClip() * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @since JDK1.1 */ public abstract void setClip(Shape clip); /** * Copies an area of the component by a distance specified by * <code>dx</code> and <code>dy</code>. From the point specified * by <code>x</code> and <code>y</code>, this method * copies downwards and to the right. To copy an area of the * component to the left or upwards, specify a negative value for * <code>dx</code> or <code>dy</code>. * If a portion of the source rectangle lies outside the bounds * of the component, or is obscured by another window or component, * <code>copyArea</code> will be unable to copy the associated * pixels. The area that is omitted can be refreshed by calling * the component's <code>paint</code> method. * @param x the <i>x</i> coordinate of the source rectangle. * @param y the <i>y</i> coordinate of the source rectangle. * @param width the width of the source rectangle. * @param height the height of the source rectangle. * @param dx the horizontal distance to copy the pixels. * @param dy the vertical distance to copy the pixels. */ public abstract void copyArea(int x, int y, int width, int height, int dx, int dy); /** * Draws a line, using the current color, between the points * <code>(x1, y1)</code> and <code>(x2, y2)</code> * in this graphics context's coordinate system. * @param x1 the first point's <i>x</i> coordinate. * @param y1 the first point's <i>y</i> coordinate. * @param x2 the second point's <i>x</i> coordinate. * @param y2 the second point's <i>y</i> coordinate. */ public abstract void drawLine(int x1, int y1, int x2, int y2); /** * Fills the specified rectangle. * The left and right edges of the rectangle are at * <code>x</code> and <code>x + width - 1</code>. * The top and bottom edges are at * <code>y</code> and <code>y + height - 1</code>. * The resulting rectangle covers an area * <code>width</code> pixels wide by * <code>height</code> pixels tall. * The rectangle is filled using the graphics context's current color. * @param x the <i>x</i> coordinate * of the rectangle to be filled. * @param y the <i>y</i> coordinate * of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @see java.awt.Graphics#clearRect * @see java.awt.Graphics#drawRect */ public abstract void fillRect(int x, int y, int width, int height); /** * Draws the outline of the specified rectangle. * The left and right edges of the rectangle are at * <code>x</code> and <code>x + width</code>. * The top and bottom edges are at * <code>y</code> and <code>y + height</code>. * The rectangle is drawn using the graphics context's current color. * @param x the <i>x</i> coordinate * of the rectangle to be drawn. * @param y the <i>y</i> coordinate * of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @see java.awt.Graphics#fillRect * @see java.awt.Graphics#clearRect */ public void drawRect(int x, int y, int width, int height) { if ((width < 0) || (height < 0)) { return; } if (height == 0 || width == 0) { drawLine(x, y, x + width, y + height); } else { drawLine(x, y, x + width - 1, y); drawLine(x + width, y, x + width, y + height - 1); drawLine(x + width, y + height, x + 1, y + height); drawLine(x, y + height, x, y + 1); } } /** * Clears the specified rectangle by filling it with the background * color of the current drawing surface. This operation does not * use the current paint mode. * <p> * Beginning with Java 1.1, the background color * of offscreen images may be system dependent. Applications should * use <code>setColor</code> followed by <code>fillRect</code> to * ensure that an offscreen image is cleared to a specific color. * @param x the <i>x</i> coordinate of the rectangle to clear. * @param y the <i>y</i> coordinate of the rectangle to clear. * @param width the width of the rectangle to clear. * @param height the height of the rectangle to clear. * @see java.awt.Graphics#fillRect(int, int, int, int) * @see java.awt.Graphics#drawRect * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode * @see java.awt.Graphics#setXORMode(java.awt.Color) */ public abstract void clearRect(int x, int y, int width, int height); /** * Draws an outlined round-cornered rectangle using this graphics * context's current color. The left and right edges of the rectangle * are at <code>x</code> and <code>x + width</code>, * respectively. The top and bottom edges of the rectangle are at * <code>y</code> and <code>y + height</code>. * @param x the <i>x</i> coordinate of the rectangle to be drawn. * @param y the <i>y</i> coordinate of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @param arcWidth the horizontal diameter of the arc * at the four corners. * @param arcHeight the vertical diameter of the arc * at the four corners. * @see java.awt.Graphics#fillRoundRect */ public abstract void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight); /** * Fills the specified rounded corner rectangle with the current color. * The left and right edges of the rectangle * are at <code>x</code> and <code>x + width - 1</code>, * respectively. The top and bottom edges of the rectangle are at * <code>y</code> and <code>y + height - 1</code>. * @param x the <i>x</i> coordinate of the rectangle to be filled. * @param y the <i>y</i> coordinate of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @param arcWidth the horizontal diameter * of the arc at the four corners.Lines 1–500 of 1256. Load more
/* * Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt; import java.io.*; import java.lang.*; import java.util.*; import java.awt.image.ImageObserver; import java.text.AttributedCharacterIterator; /** * The <code>Graphics</code> class is the abstract base class for * all graphics contexts that allow an application to draw onto * components that are realized on various devices, as well as * onto off-screen images. * <p> * A <code>Graphics</code> object encapsulates state information needed * for the basic rendering operations that Java supports. This * state information includes the following properties: * <p> * <ul> * <li>The <code>Component</code> object on which to draw. * <li>A translation origin for rendering and clipping coordinates. * <li>The current clip. * <li>The current color. * <li>The current font. * <li>The current logical pixel operation function (XOR or Paint). * <li>The current XOR alternation color * (see {@link Graphics#setXORMode}). * </ul> * <p> * Coordinates are infinitely thin and lie between the pixels of the * output device. * Operations that draw the outline of a figure operate by traversing * an infinitely thin path between pixels with a pixel-sized pen that hangs * down and to the right of the anchor point on the path. * Operations that fill a figure operate by filling the interior * of that infinitely thin path. * Operations that render horizontal text render the ascending * portion of character glyphs entirely above the baseline coordinate. * <p> * The graphics pen hangs down and to the right from the path it traverses. * This has the following implications: * <p><ul> * <li>If you draw a figure that covers a given rectangle, that * figure occupies one extra row of pixels on the right and bottom edges * as compared to filling a figure that is bounded by that same rectangle. * <li>If you draw a horizontal line along the same <i>y</i> coordinate as * the baseline of a line of text, that line is drawn entirely below * the text, except for any descenders. * </ul><p> * All coordinates that appear as arguments to the methods of this * <code>Graphics</code> object are considered relative to the * translation origin of this <code>Graphics</code> object prior to * the invocation of the method. * <p> * All rendering operations modify only pixels which lie within the * area bounded by the current clip, which is specified by a {@link Shape} * in user space and is controlled by the program using the * <code>Graphics</code> object. This <i>user clip</i> * is transformed into device space and combined with the * <i>device clip</i>, which is defined by the visibility of windows and * device extents. The combination of the user clip and device clip * defines the <i>composite clip</i>, which determines the final clipping * region. The user clip cannot be modified by the rendering * system to reflect the resulting composite clip. The user clip can only * be changed through the <code>setClip</code> or <code>clipRect</code> * methods. * All drawing or writing is done in the current color, * using the current paint mode, and in the current font. * * @author Sami Shaio * @author Arthur van Hoff * @see java.awt.Component * @see java.awt.Graphics#clipRect(int, int, int, int) * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode() * @see java.awt.Graphics#setXORMode(java.awt.Color) * @see java.awt.Graphics#setFont(java.awt.Font) * @since JDK1.0 */ public abstract class Graphics { /** * Constructs a new <code>Graphics</code> object. * This constructor is the default contructor for a graphics * context. * <p> * Since <code>Graphics</code> is an abstract class, applications * cannot call this constructor directly. Graphics contexts are * obtained from other graphics contexts or are created by calling * <code>getGraphics</code> on a component. * @see java.awt.Graphics#create() * @see java.awt.Component#getGraphics */ protected Graphics() { } /** * Creates a new <code>Graphics</code> object that is * a copy of this <code>Graphics</code> object. * @return a new graphics context that is a copy of * this graphics context. */ public abstract Graphics create(); /** * Creates a new <code>Graphics</code> object based on this * <code>Graphics</code> object, but with a new translation and clip area. * The new <code>Graphics</code> object has its origin * translated to the specified point (<i>x</i>, <i>y</i>). * Its clip area is determined by the intersection of the original * clip area with the specified rectangle. The arguments are all * interpreted in the coordinate system of the original * <code>Graphics</code> object. The new graphics context is * identical to the original, except in two respects: * <p> * <ul> * <li> * The new graphics context is translated by (<i>x</i>, <i>y</i>). * That is to say, the point (<code>0</code>, <code>0</code>) in the * new graphics context is the same as (<i>x</i>, <i>y</i>) in * the original graphics context. * <li> * The new graphics context has an additional clipping rectangle, in * addition to whatever (translated) clipping rectangle it inherited * from the original graphics context. The origin of the new clipping * rectangle is at (<code>0</code>, <code>0</code>), and its size * is specified by the <code>width</code> and <code>height</code> * arguments. * </ul> * <p> * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. * @param width the width of the clipping rectangle. * @param height the height of the clipping rectangle. * @return a new graphics context. * @see java.awt.Graphics#translate * @see java.awt.Graphics#clipRect */ public Graphics create(int x, int y, int width, int height) { Graphics g = create(); if (g == null) return null; g.translate(x, y); g.clipRect(0, 0, width, height); return g; } /** * Translates the origin of the graphics context to the point * (<i>x</i>, <i>y</i>) in the current coordinate system. * Modifies this graphics context so that its new origin corresponds * to the point (<i>x</i>, <i>y</i>) in this graphics context's * original coordinate system. All coordinates used in subsequent * rendering operations on this graphics context will be relative * to this new origin. * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. */ public abstract void translate(int x, int y); /** * Gets this graphics context's current color. * @return this graphics context's current color. * @see java.awt.Color * @see java.awt.Graphics#setColor(Color) */ public abstract Color getColor(); /** * Sets this graphics context's current color to the specified * color. All subsequent graphics operations using this graphics * context use this specified color. * @param c the new rendering color. * @see java.awt.Color * @see java.awt.Graphics#getColor */ public abstract void setColor(Color c); /** * Sets the paint mode of this graphics context to overwrite the * destination with this graphics context's current color. * This sets the logical pixel operation function to the paint or * overwrite mode. All subsequent rendering operations will * overwrite the destination with the current color. */ public abstract void setPaintMode(); /** * Sets the paint mode of this graphics context to alternate between * this graphics context's current color and the new specified color. * This specifies that logical pixel operations are performed in the * XOR mode, which alternates pixels between the current color and * a specified XOR color. * <p> * When drawing operations are performed, pixels which are the * current color are changed to the specified color, and vice versa. * <p> * Pixels that are of colors other than those two colors are changed * in an unpredictable but reversible manner; if the same figure is * drawn twice, then all pixels are restored to their original values. * @param c1 the XOR alternation color */ public abstract void setXORMode(Color c1); /** * Gets the current font. * @return this graphics context's current font. * @see java.awt.Font * @see java.awt.Graphics#setFont(Font) */ public abstract Font getFont(); /** * Sets this graphics context's font to the specified font. * All subsequent text operations using this graphics context * use this font. A null argument is silently ignored. * @param font the font. * @see java.awt.Graphics#getFont * @see java.awt.Graphics#drawString(java.lang.String, int, int) * @see java.awt.Graphics#drawBytes(byte[], int, int, int, int) * @see java.awt.Graphics#drawChars(char[], int, int, int, int) */ public abstract void setFont(Font font); /** * Gets the font metrics of the current font. * @return the font metrics of this graphics * context's current font. * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics(Font) */ public FontMetrics getFontMetrics() { return getFontMetrics(getFont()); } /** * Gets the font metrics for the specified font. * @return the font metrics for the specified font. * @param f the specified font * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics() */ public abstract FontMetrics getFontMetrics(Font f); /** * Returns the bounding rectangle of the current clipping area. * This method refers to the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using <code>setClip(null)</code>, this method returns * <code>null</code>. * The coordinates in the rectangle are relative to the coordinate * system origin of this graphics context. * @return the bounding rectangle of the current clipping area, * or <code>null</code> if no clip is set. * @see java.awt.Graphics#getClip * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Rectangle getClipBounds(); /** * Intersects the current clip with the specified rectangle. * The resulting clipping area is the intersection of the current * clipping area and the specified rectangle. If there is no * current clipping area, either because the clip has never been * set, or the clip has been cleared using <code>setClip(null)</code>, * the specified rectangle becomes the new clip. * This method sets the user clip, which is independent of the * clipping associated with device bounds and window visibility. * This method can only be used to make the current clip smaller. * To set the current clip larger, use any of the setClip methods. * Rendering operations have no effect outside of the clipping area. * @param x the x coordinate of the rectangle to intersect the clip with * @param y the y coordinate of the rectangle to intersect the clip with * @param width the width of the rectangle to intersect the clip with * @param height the height of the rectangle to intersect the clip with * @see #setClip(int, int, int, int) * @see #setClip(Shape) */ public abstract void clipRect(int x, int y, int width, int height); /** * Sets the current clip to the rectangle specified by the given * coordinates. This method sets the user clip, which is * independent of the clipping associated with device bounds * and window visibility. * Rendering operations have no effect outside of the clipping area. * @param x the <i>x</i> coordinate of the new clip rectangle. * @param y the <i>y</i> coordinate of the new clip rectangle. * @param width the width of the new clip rectangle. * @param height the height of the new clip rectangle. * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(Shape) * @see java.awt.Graphics#getClip * @since JDK1.1 */ public abstract void setClip(int x, int y, int width, int height); /** * Gets the current clipping area. * This method returns the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using <code>setClip(null)</code>, this method returns * <code>null</code>. * @return a <code>Shape</code> object representing the * current clipping area, or <code>null</code> if * no clip is set. * @see java.awt.Graphics#getClipBounds * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Shape getClip(); /** * Sets the current clipping area to an arbitrary clip shape. * Not all objects that implement the <code>Shape</code> * interface can be used to set the clip. The only * <code>Shape</code> objects that are guaranteed to be * supported are <code>Shape</code> objects that are * obtained via the <code>getClip</code> method and via * <code>Rectangle</code> objects. This method sets the * user clip, which is independent of the clipping associated * with device bounds and window visibility. * @param clip the <code>Shape</code> to use to set the clip * @see java.awt.Graphics#getClip() * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @since JDK1.1 */ public abstract void setClip(Shape clip); /** * Copies an area of the component by a distance specified by * <code>dx</code> and <code>dy</code>. From the point specified * by <code>x</code> and <code>y</code>, this method * copies downwards and to the right. To copy an area of the * component to the left or upwards, specify a negative value for * <code>dx</code> or <code>dy</code>. * If a portion of the source rectangle lies outside the bounds * of the component, or is obscured by another window or component, * <code>copyArea</code> will be unable to copy the associated * pixels. The area that is omitted can be refreshed by calling * the component's <code>paint</code> method. * @param x the <i>x</i> coordinate of the source rectangle. * @param y the <i>y</i> coordinate of the source rectangle. * @param width the width of the source rectangle. * @param height the height of the source rectangle. * @param dx the horizontal distance to copy the pixels. * @param dy the vertical distance to copy the pixels. */ public abstract void copyArea(int x, int y, int width, int height, int dx, int dy); /** * Draws a line, using the current color, between the points * <code>(x1, y1)</code> and <code>(x2, y2)</code> * in this graphics context's coordinate system. * @param x1 the first point's <i>x</i> coordinate. * @param y1 the first point's <i>y</i> coordinate. * @param x2 the second point's <i>x</i> coordinate. * @param y2 the second point's <i>y</i> coordinate. */ public abstract void drawLine(int x1, int y1, int x2, int y2); /** * Fills the specified rectangle. * The left and right edges of the rectangle are at * <code>x</code> and <code>x + width - 1</code>. * The top and bottom edges are at * <code>y</code> and <code>y + height - 1</code>. * The resulting rectangle covers an area * <code>width</code> pixels wide by * <code>height</code> pixels tall. * The rectangle is filled using the graphics context's current color. * @param x the <i>x</i> coordinate * of the rectangle to be filled. * @param y the <i>y</i> coordinate * of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @see java.awt.Graphics#clearRect * @see java.awt.Graphics#drawRect */ public abstract void fillRect(int x, int y, int width, int height); /** * Draws the outline of the specified rectangle. * The left and right edges of the rectangle are at * <code>x</code> and <code>x + width</code>. * The top and bottom edges are at * <code>y</code> and <code>y + height</code>. * The rectangle is drawn using the graphics context's current color. * @param x the <i>x</i> coordinate * of the rectangle to be drawn. * @param y the <i>y</i> coordinate * of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @see java.awt.Graphics#fillRect * @see java.awt.Graphics#clearRect */ public void drawRect(int x, int y, int width, int height) { if ((width < 0) || (height < 0)) { return; } if (height == 0 || width == 0) { drawLine(x, y, x + width, y + height); } else { drawLine(x, y, x + width - 1, y); drawLine(x + width, y, x + width, y + height - 1); drawLine(x + width, y + height, x + 1, y + height); drawLine(x, y + height, x, y + 1); } } /** * Clears the specified rectangle by filling it with the background * color of the current drawing surface. This operation does not * use the current paint mode. * <p> * Beginning with Java 1.1, the background color * of offscreen images may be system dependent. Applications should * use <code>setColor</code> followed by <code>fillRect</code> to * ensure that an offscreen image is cleared to a specific color. * @param x the <i>x</i> coordinate of the rectangle to clear. * @param y the <i>y</i> coordinate of the rectangle to clear. * @param width the width of the rectangle to clear. * @param height the height of the rectangle to clear. * @see java.awt.Graphics#fillRect(int, int, int, int) * @see java.awt.Graphics#drawRect * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode * @see java.awt.Graphics#setXORMode(java.awt.Color) */ public abstract void clearRect(int x, int y, int width, int height); /** * Draws an outlined round-cornered rectangle using this graphics * context's current color. The left and right edges of the rectangle * are at <code>x</code> and <code>x + width</code>, * respectively. The top and bottom edges of the rectangle are at * <code>y</code> and <code>y + height</code>. * @param x the <i>x</i> coordinate of the rectangle to be drawn. * @param y the <i>y</i> coordinate of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @param arcWidth the horizontal diameter of the arc * at the four corners. * @param arcHeight the vertical diameter of the arc * at the four corners. * @see java.awt.Graphics#fillRoundRect */ public abstract void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight); /** * Fills the specified rounded corner rectangle with the current color. * The left and right edges of the rectangle * are at <code>x</code> and <code>x + width - 1</code>, * respectively. The top and bottom edges of the rectangle are at * <code>y</code> and <code>y + height - 1</code>. * @param x the <i>x</i> coordinate of the rectangle to be filled. * @param y the <i>y</i> coordinate of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @param arcWidth the horizontal diameter * of the arc at the four corners.