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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.awt.Graphics

All known Subclasses:   java.awt.Graphics2D,
Graphics
abstract public class Graphics (Code)
The Graphics 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.

A Graphics object encapsulates state information needed for the basic rendering operations that Java supports. This state information includes the following properties:

  • The Component object on which to draw.
  • A translation origin for rendering and clipping coordinates.
  • The current clip.
  • The current color.
  • The current font.
  • The current logical pixel operation function (XOR or Paint).
  • The current XOR alternation color (see Graphics.setXORMode ).

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.

The graphics pen hangs down and to the right from the path it traverses. This has the following implications:

  • 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.
  • If you draw a horizontal line along the same y coordinate as the baseline of a line of text, that line is drawn entirely below the text, except for any descenders.

All coordinates that appear as arguments to the methods of this Graphics object are considered relative to the translation origin of this Graphics object prior to the invocation of the method.

All rendering operations modify only pixels which lie within the area bounded by the current clip, which is specified by a Shape in user space and is controlled by the program using the Graphics object. This user clip is transformed into device space and combined with the device clip, which is defined by the visibility of windows and device extents. The combination of the user clip and device clip defines the composite clip, 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 setClip or clipRect methods. All drawing or writing is done in the current color, using the current paint mode, and in the current font.
version:
   1.80, 05/05/07
author:
   Sami Shaio
author:
   Arthur van Hoff
See Also:   java.awt.Component
See Also:   java.awt.Graphics.clipRect(intintintint)
See Also:   java.awt.Graphics.setColor(java.awt.Color)
See Also:   java.awt.Graphics.setPaintMode
See Also:   java.awt.Graphics.setXORMode(java.awt.Color)
See Also:   java.awt.Graphics.setFont(java.awt.Font)
since:
   JDK1.0




Constructor Summary
protected  Graphics()
     Constructs a new Graphics object.

Method Summary
abstract public  voidclearRect(int x, int y, int width, int height)
     Clears the specified rectangle by filling it with the background color of the current drawing surface.
abstract public  voidclipRect(int x, int y, int width, int height)
     Intersects the current clip with the specified rectangle. The resulting clipping area is the intersection of the current clipping area and the specified rectangle.
abstract public  voidcopyArea(int x, int y, int width, int height, int dx, int dy)
     Copies an area of the component by a distance specified by dx and dy.
abstract public  Graphicscreate()
     Creates a new Graphics object that is a copy of this Graphics object.
public  Graphicscreate(int x, int y, int width, int height)
     Creates a new Graphics object based on this Graphics object, but with a new translation and clip area. The new Graphics object has its origin translated to the specified point (xy).
abstract public  voiddispose()
     Disposes of this graphics context and releases any system resources that it is using.
public  voiddraw3DRect(int x, int y, int width, int height, boolean raised)
     Draws a 3-D highlighted outline of the specified rectangle.
abstract public  voiddrawArc(int x, int y, int width, int height, int startAngle, int arcAngle)
     Draws the outline of a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees, using the current color. Angles are interpreted such that 0 degrees is at the 3 o'clock position.

public  voiddrawBytes(byte data, int offset, int length, int x, int y)
     Draws the text given by the specified byte array, using this graphics context's current font and color.
public  voiddrawChars(char data, int offset, int length, int x, int y)
     Draws the text given by the specified character array, using this graphics context's current font and color.
abstract public  booleandrawImage(Image img, int x, int y, ImageObserver observer)
     Draws as much of the specified image as is currently available. The image is drawn with its top-left corner at (xy) in this graphics context's coordinate space.
abstract public  booleandrawImage(Image img, int x, int y, int width, int height, ImageObserver observer)
     Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.

The image is drawn inside the specified rectangle of this graphics context's coordinate space, and is scaled if necessary.

abstract public  booleandrawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer)
     Draws as much of the specified image as is currently available. The image is drawn with its top-left corner at (xy) in this graphics context's coordinate space.
abstract public  booleandrawImage(Image img, int x, int y, int width, int height, Color bgcolor, ImageObserver observer)
     Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.

The image is drawn inside the specified rectangle of this graphics context's coordinate space, and is scaled if necessary.

abstract public  booleandrawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer)
     Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
abstract public  booleandrawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor, ImageObserver observer)
     Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
abstract public  voiddrawLine(int x1, int y1, int x2, int y2)
     Draws a line, using the current color, between the points (x1, y1) and (x2, y2) in this graphics context's coordinate system.
abstract public  voiddrawOval(int x, int y, int width, int height)
     Draws the outline of an oval. The result is a circle or ellipse that fits within the rectangle specified by the x, y, width, and height arguments.
abstract public  voiddrawPolygon(int xPoints, int yPoints, int nPoints)
     Draws a closed polygon defined by arrays of x and y coordinates.
public  voiddrawPolygon(Polygon p)
     Draws the outline of a polygon defined by the specified Polygon object.
abstract public  voiddrawPolyline(int xPoints, int yPoints, int nPoints)
     Draws a sequence of connected lines defined by arrays of x and y coordinates.
public  voiddrawRect(int x, int y, int width, int height)
     Draws the outline of the specified rectangle.
abstract public  voiddrawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)
     Draws an outlined round-cornered rectangle using this graphics context's current color.
abstract public  voiddrawString(String str, int x, int y)
     Draws the text given by the specified string, using this graphics context's current font and color.
abstract public  voiddrawString(AttributedCharacterIterator iterator, int x, int y)
     Renders the text of the specified iterator applying its attributes in accordance with the specification of the java.awt.font.TextAttribute TextAttribute class.

The baseline of the leftmost character is at position (xy) in this graphics context's coordinate system.

public  voidfill3DRect(int x, int y, int width, int height, boolean raised)
     Paints a 3-D highlighted rectangle filled with the current color.
abstract public  voidfillArc(int x, int y, int width, int height, int startAngle, int arcAngle)
     Fills a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees. Angles are interpreted such that 0 degrees is at the 3 o'clock position.

abstract public  voidfillOval(int x, int y, int width, int height)
     Fills an oval bounded by the specified rectangle with the current color.
abstract public  voidfillPolygon(int xPoints, int yPoints, int nPoints)
     Fills a closed polygon defined by arrays of x and y coordinates.
public  voidfillPolygon(Polygon p)
     Fills the polygon defined by the specified Polygon object with the graphics context's current color.
abstract public  voidfillRect(int x, int y, int width, int height)
     Fills the specified rectangle.
abstract public  voidfillRoundRect(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 x and x + width - 1, respectively.
public  voidfinalize()
     Disposes of this graphics context once it is no longer referenced.
abstract public  ShapegetClip()
     Gets the current clipping area.
abstract public  RectanglegetClipBounds()
     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.
public  RectanglegetClipBounds(Rectangle r)
     Returns the bounding rectangle of the current clipping area. The coordinates in the rectangle are relative to the coordinate system origin of this graphics context.
public  RectanglegetClipRect()
     Returns the bounding rectangle of the current clipping area.
abstract public  ColorgetColor()
     Gets this graphics context's current color.
abstract public  FontgetFont()
     Gets the current font.
public  FontMetricsgetFontMetrics()
     Gets the font metrics of the current font.
abstract public  FontMetricsgetFontMetrics(Font f)
     Gets the font metrics for the specified font.
public  booleanhitClip(int x, int y, int width, int height)
     Returns true if the specified rectangular area might intersect the current clipping area.
abstract public  voidsetClip(int x, int y, int width, int height)
     Sets the current clip to the rectangle specified by the given coordinates.
abstract public  voidsetClip(Shape clip)
     Sets the current clipping area to an arbitrary clip shape. Not all objects that implement the Shape interface can be used to set the clip.
abstract public  voidsetColor(Color c)
     Sets this graphics context's current color to the specified color.
abstract public  voidsetFont(Font font)
     Sets this graphics context's font to the specified font.
abstract public  voidsetPaintMode()
     Sets the paint mode of this graphics context to overwrite the destination with this graphics context's current color.
abstract public  voidsetXORMode(Color c1)
     Sets the paint mode of this graphics context to alternate between this graphics context's current color and the new specified color.
public  StringtoString()
     Returns a String object representing this Graphics object's value.
abstract public  voidtranslate(int x, int y)
     Translates the origin of the graphics context to the point (xy) in the current coordinate system.


Constructor Detail
Graphics
protected Graphics()(Code)
Constructs a new Graphics object. This constructor is the default contructor for a graphics context.

Since Graphics is an abstract class, applications cannot call this constructor directly. Graphics contexts are obtained from other graphics contexts or are created by calling getGraphics on a component.
See Also:   java.awt.Graphics.create
See Also:   java.awt.Component.getGraphics





Method Detail
clearRect
abstract public void clearRect(int x, int y, int width, int height)(Code)
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.

Beginning with Java 1.1, the background color of offscreen images may be system dependent. Applications should use setColor followed by fillRect to ensure that an offscreen image is cleared to a specific color.
Parameters:
  x - the x coordinate of the rectangle to clear.
Parameters:
  y - the y coordinate of the rectangle to clear.
Parameters:
  width - the width of the rectangle to clear.
Parameters:
  height - the height of the rectangle to clear.
See Also:   java.awt.Graphics.fillRect(intintintint)
See Also:   java.awt.Graphics.drawRect
See Also:   java.awt.Graphics.setColor(java.awt.Color)
See Also:   java.awt.Graphics.setPaintMode
See Also:   java.awt.Graphics.setXORMode(java.awt.Color)




clipRect
abstract public void clipRect(int x, int y, int width, int height)(Code)
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 setClip(null), 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.
Parameters:
  x - the x coordinate of the rectangle to intersect the clip with
Parameters:
  y - the y coordinate of the rectangle to intersect the clip with
Parameters:
  width - the width of the rectangle to intersect the clip with
Parameters:
  height - the height of the rectangle to intersect the clip with
See Also:   Graphics.setClip(int,int,int,int)
See Also:   Graphics.setClip(Shape)



copyArea
abstract public void copyArea(int x, int y, int width, int height, int dx, int dy)(Code)
Copies an area of the component by a distance specified by dx and dy. From the point specified by x and y, 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 dx or dy. If a portion of the source rectangle lies outside the bounds of the component, or is obscured by another window or component, copyArea will be unable to copy the associated pixels. The area that is omitted can be refreshed by calling the component's paint method.
Parameters:
  x - the x coordinate of the source rectangle.
Parameters:
  y - the y coordinate of the source rectangle.
Parameters:
  width - the width of the source rectangle.
Parameters:
  height - the height of the source rectangle.
Parameters:
  dx - the horizontal distance to copy the pixels.
Parameters:
  dy - the vertical distance to copy the pixels.



create
abstract public Graphics create()(Code)
Creates a new Graphics object that is a copy of this Graphics object. a new graphics context that is a copy of this graphics context.



create
public Graphics create(int x, int y, int width, int height)(Code)
Creates a new Graphics object based on this Graphics object, but with a new translation and clip area. The new Graphics object has its origin translated to the specified point (xy). 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 Graphics object. The new graphics context is identical to the original, except in two respects:

  • The new graphics context is translated by (xy). That is to say, the point (00) in the new graphics context is the same as (xy) in the original graphics context.
  • 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 (00), and its size is specified by the width and height arguments.


Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
Parameters:
  width - the width of the clipping rectangle.
Parameters:
  height - the height of the clipping rectangle. a new graphics context.
See Also:   java.awt.Graphics.translate
See Also:   java.awt.Graphics.clipRect




dispose
abstract public void dispose()(Code)
Disposes of this graphics context and releases any system resources that it is using. A Graphics object cannot be used after disposehas been called.

When a Java program runs, a large number of Graphics objects can be created within a short time frame. Although the finalization process of the garbage collector also disposes of the same system resources, it is preferable to manually free the associated resources by calling this method rather than to rely on a finalization process which may not run to completion for a long period of time.

Graphics objects which are provided as arguments to the paint and update methods of components are automatically released by the system when those methods return. For efficiency, programmers should call dispose when finished using a Graphics object only if it was created directly from a component or another Graphics object.
See Also:   java.awt.Graphics.finalize
See Also:   java.awt.Component.paint
See Also:   java.awt.Component.update
See Also:   java.awt.Component.getGraphics
See Also:   java.awt.Graphics.create




draw3DRect
public void draw3DRect(int x, int y, int width, int height, boolean raised)(Code)
Draws a 3-D highlighted outline of the specified rectangle. The edges of the rectangle are highlighted so that they appear to be beveled and lit from the upper left corner.

The colors used for the highlighting effect are determined based on the current color. The resulting rectangle covers an area that is width + 1 pixels wide by height + 1 pixels tall.
Parameters:
  x - the x coordinate of the rectangle to be drawn.
Parameters:
  y - the y coordinate of the rectangle to be drawn.
Parameters:
  width - the width of the rectangle to be drawn.
Parameters:
  height - the height of the rectangle to be drawn.
Parameters:
  raised - a boolean that determines whether the rectangleappears to be raised above the surface or sunk into the surface.
See Also:   java.awt.Graphics.fill3DRect




drawArc
abstract public void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)(Code)
Draws the outline of a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees, using the current color. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (xy) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.
Parameters:
  x - the x coordinate of the upper-left corner of the arc to be drawn.
Parameters:
  y - the y coordinate of the upper-left corner of the arc to be drawn.
Parameters:
  width - the width of the arc to be drawn.
Parameters:
  height - the height of the arc to be drawn.
Parameters:
  startAngle - the beginning angle.
Parameters:
  arcAngle - the angular extent of the arc, relative to the start angle.
See Also:   java.awt.Graphics.fillArc




drawBytes
public void drawBytes(byte data, int offset, int length, int x, int y)(Code)
Draws the text given by the specified byte array, using this graphics context's current font and color. The baseline of the first character is at position (xy) in this graphics context's coordinate system.

Use of this method is not recommended as each byte is interpreted as a Unicode code point in the range 0 to 255, and so can only be used to draw Latin characters in that range.
Parameters:
  data - the data to be drawn
Parameters:
  offset - the start offset in the data
Parameters:
  length - the number of bytes that are drawn
Parameters:
  x - the x coordinate of the baseline of the text
Parameters:
  y - the y coordinate of the baseline of the text
throws:
  NullPointerException - if data is null.
throws:
  IndexOutOfBoundsException - if offset orlengthis less than zero, or offset+length is greater than the length of the data array.
See Also:   java.awt.Graphics.drawChars
See Also:   java.awt.Graphics.drawString




drawChars
public void drawChars(char data, int offset, int length, int x, int y)(Code)
Draws the text given by the specified character array, using this graphics context's current font and color. The baseline of the first character is at position (xy) in this graphics context's coordinate system.
Parameters:
  data - the array of characters to be drawn
Parameters:
  offset - the start offset in the data
Parameters:
  length - the number of characters to be drawn
Parameters:
  x - the x coordinate of the baseline of the text
Parameters:
  y - the y coordinate of the baseline of the text
throws:
  NullPointerException - if data is null.
throws:
  IndexOutOfBoundsException - if offset orlengthis less than zero, or offset+length is greater than the length of thedata array.
See Also:   java.awt.Graphics.drawBytes
See Also:   java.awt.Graphics.drawString



drawImage
abstract public boolean drawImage(Image img, int x, int y, ImageObserver observer)(Code)
Draws as much of the specified image as is currently available. The image is drawn with its top-left corner at (xy) in this graphics context's coordinate space. Transparent pixels in the image do not affect whatever pixels are already there.

This method returns immediately in all cases, even if the complete image has not yet been loaded, and it has not been dithered and converted for the current output device.

If the image has completely loaded and its pixels are no longer being changed, then drawImage returns true. Otherwise, drawImage returns false and as more of the image becomes available or it is time to draw another frame of animation, the process that loads the image notifies the specified image observer.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
Parameters:
  observer - object to be notified as more of the image is converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)




drawImage
abstract public boolean drawImage(Image img, int x, int y, int width, int height, ImageObserver observer)(Code)
Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.

The image is drawn inside the specified rectangle of this graphics context's coordinate space, and is scaled if necessary. Transparent pixels do not affect whatever pixels are already there.

This method returns immediately in all cases, even if the entire image has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete, then drawImage returns false. As more of the image becomes available, the process that loads the image notifies the image observer by calling its imageUpdate method.

A scaled version of an image will not necessarily be available immediately just because an unscaled version of the image has been constructed for this output device. Each size of the image may be cached separately and generated from the original data in a separate image production sequence.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
Parameters:
  width - the width of the rectangle.
Parameters:
  height - the height of the rectangle.
Parameters:
  observer - object to be notified as more of the image is converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)




drawImage
abstract public boolean drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer)(Code)
Draws as much of the specified image as is currently available. The image is drawn with its top-left corner at (xy) in this graphics context's coordinate space. Transparent pixels are drawn in the specified background color.

This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the complete image has not yet been loaded, and it has not been dithered and converted for the current output device.

If the image has completely loaded and its pixels are no longer being changed, then drawImage returns true. Otherwise, drawImage returns false and as more of the image becomes available or it is time to draw another frame of animation, the process that loads the image notifies the specified image observer.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
Parameters:
  bgcolor - the background color to paint under thenon-opaque portions of the image.
Parameters:
  observer - object to be notified as more of the image is converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)




drawImage
abstract public boolean drawImage(Image img, int x, int y, int width, int height, Color bgcolor, ImageObserver observer)(Code)
Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.

The image is drawn inside the specified rectangle of this graphics context's coordinate space, and is scaled if necessary. Transparent pixels are drawn in the specified background color. This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the entire image has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that loads the image notifies the specified image observer.

A scaled version of an image will not necessarily be available immediately just because an unscaled version of the image has been constructed for this output device. Each size of the image may be cached separately and generated from the original data in a separate image production sequence.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
Parameters:
  width - the width of the rectangle.
Parameters:
  height - the height of the rectangle.
Parameters:
  bgcolor - the background color to paint under thenon-opaque portions of the image.
Parameters:
  observer - object to be notified as more of the image is converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)




drawImage
abstract public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer)(Code)
Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface. Transparent pixels do not affect whatever pixels are already there.

This method returns immediately in all cases, even if the image area to be drawn has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that loads the image notifies the specified image observer.

This method always uses the unscaled version of the image to render the scaled rectangle and performs the required scaling on the fly. It does not use a cached, scaled version of the image for this operation. Scaling of the image from source to destination is performed such that the first coordinate of the source rectangle is mapped to the first coordinate of the destination rectangle, and the second source coordinate is mapped to the second destination coordinate. The subimage is scaled and flipped as needed to preserve those mappings.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  dx1 - the x coordinate of the first corner of thedestination rectangle.
Parameters:
  dy1 - the y coordinate of the first corner of thedestination rectangle.
Parameters:
  dx2 - the x coordinate of the second corner of thedestination rectangle.
Parameters:
  dy2 - the y coordinate of the second corner of thedestination rectangle.
Parameters:
  sx1 - the x coordinate of the first corner of thesource rectangle.
Parameters:
  sy1 - the y coordinate of the first corner of thesource rectangle.
Parameters:
  sx2 - the x coordinate of the second corner of thesource rectangle.
Parameters:
  sy2 - the y coordinate of the second corner of thesource rectangle.
Parameters:
  observer - object to be notified as more of the image isscaled and converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)
since:
   JDK1.1




drawImage
abstract public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor, ImageObserver observer)(Code)
Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.

Transparent pixels are drawn in the specified background color. This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the image area to be drawn has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that loads the image notifies the specified image observer.

This method always uses the unscaled version of the image to render the scaled rectangle and performs the required scaling on the fly. It does not use a cached, scaled version of the image for this operation. Scaling of the image from source to destination is performed such that the first coordinate of the source rectangle is mapped to the first coordinate of the destination rectangle, and the second source coordinate is mapped to the second destination coordinate. The subimage is scaled and flipped as needed to preserve those mappings.
Parameters:
  img - the specified image to be drawn. This method doesnothing if img is null.
Parameters:
  dx1 - the x coordinate of the first corner of thedestination rectangle.
Parameters:
  dy1 - the y coordinate of the first corner of thedestination rectangle.
Parameters:
  dx2 - the x coordinate of the second corner of thedestination rectangle.
Parameters:
  dy2 - the y coordinate of the second corner of thedestination rectangle.
Parameters:
  sx1 - the x coordinate of the first corner of thesource rectangle.
Parameters:
  sy1 - the y coordinate of the first corner of thesource rectangle.
Parameters:
  sx2 - the x coordinate of the second corner of thesource rectangle.
Parameters:
  sy2 - the y coordinate of the second corner of thesource rectangle.
Parameters:
  bgcolor - the background color to paint under thenon-opaque portions of the image.
Parameters:
  observer - object to be notified as more of the image isscaled and converted. false if the image pixels are still changing;true otherwise.
See Also:   java.awt.Image
See Also:   java.awt.image.ImageObserver
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)
since:
   JDK1.1




drawLine
abstract public void drawLine(int x1, int y1, int x2, int y2)(Code)
Draws a line, using the current color, between the points (x1, y1) and (x2, y2) in this graphics context's coordinate system.
Parameters:
  x1 - the first point's x coordinate.
Parameters:
  y1 - the first point's y coordinate.
Parameters:
  x2 - the second point's x coordinate.
Parameters:
  y2 - the second point's y coordinate.



drawOval
abstract public void drawOval(int x, int y, int width, int height)(Code)
Draws the outline of an oval. The result is a circle or ellipse that fits within the rectangle specified by the x, y, width, and height arguments.

The oval covers an area that is width + 1 pixels wide and height + 1 pixels tall.
Parameters:
  x - the x coordinate of the upper left corner of the oval to be drawn.
Parameters:
  y - the y coordinate of the upper left corner of the oval to be drawn.
Parameters:
  width - the width of the oval to be drawn.
Parameters:
  height - the height of the oval to be drawn.
See Also:   java.awt.Graphics.fillOval




drawPolygon
abstract public void drawPolygon(int xPoints, int yPoints, int nPoints)(Code)
Draws a closed polygon defined by arrays of x and y coordinates. Each pair of (xy) coordinates defines a point.

This method draws the polygon defined by nPoint line segments, where the first nPoint - 1 line segments are line segments from (xPoints[i - 1], yPoints[i - 1]) to (xPoints[i], yPoints[i]), for 1 ≤ i ≤ nPoints. The figure is automatically closed by drawing a line connecting the final point to the first point, if those points are different.
Parameters:
  xPoints - a an array of x coordinates.
Parameters:
  yPoints - a an array of y coordinates.
Parameters:
  nPoints - a the total number of points.
See Also:   java.awt.Graphics.fillPolygon
See Also:   java.awt.Graphics.drawPolyline




drawPolygon
public void drawPolygon(Polygon p)(Code)
Draws the outline of a polygon defined by the specified Polygon object.
Parameters:
  p - the polygon to draw.
See Also:   java.awt.Graphics.fillPolygon
See Also:   java.awt.Graphics.drawPolyline



drawPolyline
abstract public void drawPolyline(int xPoints, int yPoints, int nPoints)(Code)
Draws a sequence of connected lines defined by arrays of x and y coordinates. Each pair of (xy) coordinates defines a point. The figure is not closed if the first point differs from the last point.
Parameters:
  xPoints - an array of x points
Parameters:
  yPoints - an array of y points
Parameters:
  nPoints - the total number of points
See Also:   java.awt.Graphics.drawPolygon(int[]int[]int)
since:
   JDK1.1



drawRect
public void drawRect(int x, int y, int width, int height)(Code)
Draws the outline of the specified rectangle. The left and right edges of the rectangle are at x and x + width. The top and bottom edges are at y and y + height. The rectangle is drawn using the graphics context's current color.
Parameters:
  x - the x coordinate of the rectangle to be drawn.
Parameters:
  y - the y coordinate of the rectangle to be drawn.
Parameters:
  width - the width of the rectangle to be drawn.
Parameters:
  height - the height of the rectangle to be drawn.
See Also:   java.awt.Graphics.fillRect
See Also:   java.awt.Graphics.clearRect



drawRoundRect
abstract public void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)(Code)
Draws an outlined round-cornered rectangle using this graphics context's current color. The left and right edges of the rectangle are at x and x + width, respectively. The top and bottom edges of the rectangle are at y and y + height.
Parameters:
  x - the x coordinate of the rectangle to be drawn.
Parameters:
  y - the y coordinate of the rectangle to be drawn.
Parameters:
  width - the width of the rectangle to be drawn.
Parameters:
  height - the height of the rectangle to be drawn.
Parameters:
  arcWidth - the horizontal diameter of the arc at the four corners.
Parameters:
  arcHeight - the vertical diameter of the arc at the four corners.
See Also:   java.awt.Graphics.fillRoundRect



drawString
abstract public void drawString(String str, int x, int y)(Code)
Draws the text given by the specified string, using this graphics context's current font and color. The baseline of the leftmost character is at position (xy) in this graphics context's coordinate system.
Parameters:
  str - the string to be drawn.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
throws:
  NullPointerException - if str is null.
See Also:   java.awt.Graphics.drawBytes
See Also:   java.awt.Graphics.drawChars



drawString
abstract public void drawString(AttributedCharacterIterator iterator, int x, int y)(Code)
Renders the text of the specified iterator applying its attributes in accordance with the specification of the java.awt.font.TextAttribute TextAttribute class.

The baseline of the leftmost character is at position (xy) in this graphics context's coordinate system.
Parameters:
  iterator - the iterator whose text is to be drawn
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.
throws:
  NullPointerException - if iterator isnull.
See Also:   java.awt.Graphics.drawBytes
See Also:   java.awt.Graphics.drawChars




fill3DRect
public void fill3DRect(int x, int y, int width, int height, boolean raised)(Code)
Paints a 3-D highlighted rectangle filled with the current color. The edges of the rectangle will be highlighted so that it appears as if the edges were beveled and lit from the upper left corner. The colors used for the highlighting effect will be determined from the current color.
Parameters:
  x - the x coordinate of the rectangle to be filled.
Parameters:
  y - the y coordinate of the rectangle to be filled.
Parameters:
  width - the width of the rectangle to be filled.
Parameters:
  height - the height of the rectangle to be filled.
Parameters:
  raised - a boolean value that determines whether the rectangle appears to be raised above the surface or etched into the surface.
See Also:   java.awt.Graphics.draw3DRect



fillArc
abstract public void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)(Code)
Fills a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (xy) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.
Parameters:
  x - the x coordinate of the upper-left corner of the arc to be filled.
Parameters:
  y - the y coordinate of the upper-left corner of the arc to be filled.
Parameters:
  width - the width of the arc to be filled.
Parameters:
  height - the height of the arc to be filled.
Parameters:
  startAngle - the beginning angle.
Parameters:
  arcAngle - the angular extent of the arc, relative to the start angle.
See Also:   java.awt.Graphics.drawArc




fillOval
abstract public void fillOval(int x, int y, int width, int height)(Code)
Fills an oval bounded by the specified rectangle with the current color.
Parameters:
  x - the x coordinate of the upper left corner of the oval to be filled.
Parameters:
  y - the y coordinate of the upper left corner of the oval to be filled.
Parameters:
  width - the width of the oval to be filled.
Parameters:
  height - the height of the oval to be filled.
See Also:   java.awt.Graphics.drawOval



fillPolygon
abstract public void fillPolygon(int xPoints, int yPoints, int nPoints)(Code)
Fills a closed polygon defined by arrays of x and y coordinates.

This method draws the polygon defined by nPoint line segments, where the first nPoint - 1 line segments are line segments from (xPoints[i - 1], yPoints[i - 1]) to (xPoints[i], yPoints[i]), for 1 ≤ i ≤ nPoints. The figure is automatically closed by drawing a line connecting the final point to the first point, if those points are different.

The area inside the polygon is defined using an even-odd fill rule, also known as the alternating rule.
Parameters:
  xPoints - a an array of x coordinates.
Parameters:
  yPoints - a an array of y coordinates.
Parameters:
  nPoints - a the total number of points.
See Also:   java.awt.Graphics.drawPolygon(int[]int[]int)




fillPolygon
public void fillPolygon(Polygon p)(Code)
Fills the polygon defined by the specified Polygon object with the graphics context's current color.

The area inside the polygon is defined using an even-odd fill rule, also known as the alternating rule.
Parameters:
  p - the polygon to fill.
See Also:   java.awt.Graphics.drawPolygon(int[]int[]int)




fillRect
abstract public void fillRect(int x, int y, int width, int height)(Code)
Fills the specified rectangle. The left and right edges of the rectangle are at x and x + width - 1. The top and bottom edges are at y and y + height - 1. The resulting rectangle covers an area width pixels wide by height pixels tall. The rectangle is filled using the graphics context's current color.
Parameters:
  x - the x coordinate of the rectangle to be filled.
Parameters:
  y - the y coordinate of the rectangle to be filled.
Parameters:
  width - the width of the rectangle to be filled.
Parameters:
  height - the height of the rectangle to be filled.
See Also:   java.awt.Graphics.clearRect
See Also:   java.awt.Graphics.drawRect



fillRoundRect
abstract public void fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)(Code)
Fills the specified rounded corner rectangle with the current color. The left and right edges of the rectangle are at x and x + width - 1, respectively. The top and bottom edges of the rectangle are at y and y + height - 1.
Parameters:
  x - the x coordinate of the rectangle to be filled.
Parameters:
  y - the y coordinate of the rectangle to be filled.
Parameters:
  width - the width of the rectangle to be filled.
Parameters:
  height - the height of the rectangle to be filled.
Parameters:
  arcWidth - the horizontal diameter of the arc at the four corners.
Parameters:
  arcHeight - the vertical diameter of the arc at the four corners.
See Also:   java.awt.Graphics.drawRoundRect



finalize
public void finalize()(Code)
Disposes of this graphics context once it is no longer referenced.
See Also:   Graphics.dispose



getClip
abstract public Shape getClip()(Code)
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 setClip(null), this method returns null. a Shape object representing the current clipping area, or null ifno clip is set.
See Also:   java.awt.Graphics.getClipBounds
See Also:   java.awt.Graphics.clipRect
See Also:   java.awt.Graphics.setClip(intintintint)
See Also:   java.awt.Graphics.setClip(Shape)
since:
   JDK1.1



getClipBounds
abstract public Rectangle getClipBounds()(Code)
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 setClip(null), this method returns null. The coordinates in the rectangle are relative to the coordinate system origin of this graphics context. the bounding rectangle of the current clipping area,or null if no clip is set.
See Also:   java.awt.Graphics.getClip
See Also:   java.awt.Graphics.clipRect
See Also:   java.awt.Graphics.setClip(intintintint)
See Also:   java.awt.Graphics.setClip(Shape)
since:
   JDK1.1



getClipBounds
public Rectangle getClipBounds(Rectangle r)(Code)
Returns the bounding rectangle of the current clipping area. The coordinates in the rectangle are relative to the coordinate system origin of this graphics context. This method differs from Graphics.getClipBounds() getClipBounds in that an existing rectangle is used instead of allocating a new one. 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 setClip(null), this method returns the specified Rectangle.
Parameters:
  r - the rectangle where the current clipping area iscopied to. Any current values in this rectangle areoverwritten. the bounding rectangle of the current clipping area.



getClipRect
public Rectangle getClipRect()(Code)
Returns the bounding rectangle of the current clipping area. the bounding rectangle of the current clipping areaor null if no clip is set.



getColor
abstract public Color getColor()(Code)
Gets this graphics context's current color. this graphics context's current color.
See Also:   java.awt.Color
See Also:   java.awt.Graphics.setColor(Color)



getFont
abstract public Font getFont()(Code)
Gets the current font. this graphics context's current font.
See Also:   java.awt.Font
See Also:   java.awt.Graphics.setFont(Font)



getFontMetrics
public FontMetrics getFontMetrics()(Code)
Gets the font metrics of the current font. the font metrics of this graphics context's current font.
See Also:   java.awt.Graphics.getFont
See Also:   java.awt.FontMetrics
See Also:   java.awt.Graphics.getFontMetrics(Font)



getFontMetrics
abstract public FontMetrics getFontMetrics(Font f)(Code)
Gets the font metrics for the specified font. the font metrics for the specified font.
Parameters:
  f - the specified font
See Also:   java.awt.Graphics.getFont
See Also:   java.awt.FontMetrics
See Also:   java.awt.Graphics.getFontMetrics



hitClip
public boolean hitClip(int x, int y, int width, int height)(Code)
Returns true if the specified rectangular area might intersect the current clipping area. The coordinates of the specified rectangular area are in the user coordinate space and are relative to the coordinate system origin of this graphics context. This method may use an algorithm that calculates a result quickly but which sometimes might return true even if the specified rectangular area does not intersect the clipping area. The specific algorithm employed may thus trade off accuracy for speed, but it will never return false unless it can guarantee that the specified rectangular area does not intersect the current clipping area. The clipping area used by this method can represent the intersection of the user clip as specified through the clip methods of this graphics context as well as the clipping associated with the device or image bounds and window visibility.
Parameters:
  x - the x coordinate of the rectangle to test against the clip
Parameters:
  y - the y coordinate of the rectangle to test against the clip
Parameters:
  width - the width of the rectangle to test against the clip
Parameters:
  height - the height of the rectangle to test against the clip true if the specified rectangle intersectsthe bounds of the current clip; falseotherwise.



setClip
abstract public void setClip(int x, int y, int width, int height)(Code)
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.
Parameters:
  x - the x coordinate of the new clip rectangle.
Parameters:
  y - the y coordinate of the new clip rectangle.
Parameters:
  width - the width of the new clip rectangle.
Parameters:
  height - the height of the new clip rectangle.
See Also:   java.awt.Graphics.clipRect
See Also:   java.awt.Graphics.setClip(Shape)
See Also:   java.awt.Graphics.getClip
since:
   JDK1.1



setClip
abstract public void setClip(Shape clip)(Code)
Sets the current clipping area to an arbitrary clip shape. Not all objects that implement the Shape interface can be used to set the clip. The only Shape objects that are guaranteed to be supported are Shape objects that are obtained via the getClip method and via Rectangle objects. This method sets the user clip, which is independent of the clipping associated with device bounds and window visibility.
Parameters:
  clip - the Shape to use to set the clip
See Also:   java.awt.Graphics.getClip
See Also:   java.awt.Graphics.clipRect
See Also:   java.awt.Graphics.setClip(intintintint)
since:
   JDK1.1



setColor
abstract public void setColor(Color c)(Code)
Sets this graphics context's current color to the specified color. All subsequent graphics operations using this graphics context use this specified color.
Parameters:
  c - the new rendering color.
See Also:   java.awt.Color
See Also:   java.awt.Graphics.getColor



setFont
abstract public void setFont(Font font)(Code)
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.
Parameters:
  font - the font.
See Also:   java.awt.Graphics.getFont
See Also:   java.awt.Graphics.drawString(java.lang.Stringintint)
See Also:   java.awt.Graphics.drawBytes(byte[]intintintint)
See Also:   java.awt.Graphics.drawChars(char[]intintintint)



setPaintMode
abstract public void setPaintMode()(Code)
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.



setXORMode
abstract public void setXORMode(Color c1)(Code)
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.

When drawing operations are performed, pixels which are the current color are changed to the specified color, and vice versa.

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.
Parameters:
  c1 - the XOR alternation color




toString
public String toString()(Code)
Returns a String object representing this Graphics object's value. a string representation of this graphics context.



translate
abstract public void translate(int x, int y)(Code)
Translates the origin of the graphics context to the point (xy) in the current coordinate system. Modifies this graphics context so that its new origin corresponds to the point (xy) 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.
Parameters:
  x - the x coordinate.
Parameters:
  y - the y coordinate.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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