This Graphics2D
class extends the Graphics
class to provide more sophisticated control over geometry, coordinate
transformations, color management, and text layout. This is the fundamental
class for rendering 2-dimensional shapes, text and images on the Java(tm)
platform.
Graphics2D
object are specified in a device-independent coordinate system called User
Space, which is used by applications. The Graphics2D
object
contains an AffineTransform
object as part of its rendering state that defines how to convert coordinates
from user space to device-dependent coordinates in Device Space.
Coordinates in device space usually refer to individual device pixels and are
aligned on the infinitely thin gaps between these pixels. Some
Graphics2D
objects can be used to capture rendering operations for
storage into a graphics metafile for playback on a concrete device of unknown
physical resolution at a later time. Since the resolution might not be known
when the rendering operations are captured, the Graphics2D
Transform
is set up to transform user coordinates to a virtual
device space that approximates the expected resolution of the target device.
Further transformations might need to be applied at playback time if the
estimate is incorrect.
Some of the operations performed by the rendering attribute objects occur in
the device space, but all Graphics2D
methods take user space
coordinates.
Every Graphics2D
object is associated with a target that defines
where rendering takes place. A GraphicsConfiguration
object defines the characteristics of the rendering target, such as pixel format
and resolution. The same rendering target is used throughout the life of a
Graphics2D
object.
When creating a Graphics2D
object, the
GraphicsConfiguration
specifies the default
transform for the target of the Graphics2D
(a Component
or Image
).
This default transform maps the user space coordinate system to screen and
printer device coordinates such that the origin maps to the upper left hand
corner of the target region of the device with increasing X coordinates
extending to the right and increasing Y coordinates extending downward. The
scaling of the default transform is set to identity for those devices that are
close to 72 dpi, such as screen devices. The scaling of the default transform is
set to approximately 72 user space coordinates per square inch for high
resolution devices, such as printers. For image buffers, the default transform
is the Identity
transform.
Graphics2D
rendering attributes.
The renderer can optimize many of these steps, either by caching the results for
future calls, by collapsing multiple virtual steps into a single operation, or
by recognizing various attributes as common simple cases that can be eliminated
by modifying other parts of the operation.
The steps in the rendering process are:
Clip
. The
Clip
is specified by a Shape
in user space and is controlled by the program using the various clip
manipulation methods of Graphics
and Graphics2D
.
This user clip is transformed into device space by the current
Transform
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 is not modified by the
rendering system to reflect the resulting composite clip.
Composite
attribute in the Graphics2D
context. Shape
operations
draw(Shape)
operation, then the createStrokedShape
method on the current Stroke
attribute in the Graphics2D
context is used to construct a new
Shape
object that contains the outline of the specified
Shape
.
Shape
is transformed from user space to device space
using the current Transform
in the Graphics2D
context.
Shape
is extracted using the getPathIterator
method of Shape
, which returns a PathIterator
object that iterates along the boundary of the Shape
.
Graphics2D
object cannot handle the curved segments
that the PathIterator
object returns then it can call the
alternate getPathIterator
method of Shape
, which flattens the Shape
.
Paint
in the Graphics2D
context is queried for a PaintContext
,
which specifies the colors to render in device space. String
:
String
, then the current
Font
in the Graphics2D
context is asked to
convert the Unicode characters in the String
into a set of
glyphs for presentation with whatever basic layout and shaping algorithms
the font implements.
AttributedCharacterIterator
,
the iterator is asked to convert itself to a TextLayout
using its embedded font attributes. The TextLayout
implements
more sophisticated glyph layout algorithms that perform Unicode
bi-directional layout adjustments automatically for multiple fonts of
differing writing directions.
GlyphVector
,
then the GlyphVector
object already contains the appropriate
font-specific glyph codes with explicit coordinates for the position of
each glyph. Font
is queried to obtain outlines for the
indicated glyphs. These outlines are treated as shapes in user space
relative to the position of each glyph that was determined in step 1.
Shape
operations.
Paint
is queried for a
PaintContext
, which specifies the colors to render in device
space. Image
Operations
Image
. This bounding box is specified in Image Space, which is
the Image
object's local coordinate system.
AffineTransform
is passed to drawImage(Image,
AffineTransform, ImageObserver)
, the AffineTransform
is used to transform the bounding box from image space to user space. If no
AffineTransform
is supplied, the bounding box is treated as if
it is already in user space.
Image
is transformed from
user space into device space using the current Transform
. Note
that the result of transforming the bounding box does not necessarily result
in a rectangular region in device space.
Image
object determines what colors to render, sampled
according to the source to destination coordinate mapping specified by the
current Transform
and the optional image transform.
Graphics2D
rendering attributes are:
Paint
Component
.
Font
Font
of the Component
.
Stroke
Transform
getDefaultTransform
for the GraphicsConfiguration
of the Component
.
Composite
AlphaComposite.SRC_OVER
rule.
Clip
Clip
, the output is clipped to the
Component
. The Java 2D(tm) (Java(tm) 2 platform) API supports antialiasing renderers. A
pen with a width of one pixel does not need to fall completely on pixel N as
opposed to pixel N+1. The pen can fall partially on both pixels. It is not
necessary to choose a bias direction for a wide pen since the blending that
occurs along the pen traversal edges makes the sub-pixel position of the pen
visible to the user. On the other hand, when antialiasing is turned off by
setting the KEY_ANTIALIASING
hint key to the VALUE_ANTIALIAS_OFF
hint value, the renderer might need to apply a bias to determine which pixel to
modify when the pen is straddling a pixel boundary, such as when it is drawn
along an integer coordinate in device space. While the capabilities of an
antialiasing renderer make it no longer necessary for the rendering model to
specify a bias for the pen, it is desirable for the antialiasing and
non-antialiasing renderers to perform similarly for the common cases of drawing
one-pixel wide horizontal and vertical lines on the screen. To ensure that
turning on antialiasing by setting the KEY_ANTIALIASING
hint key to VALUE_ANTIALIAS_ON
does not cause such lines to suddenly become twice as wide and half as opaque,
it is desirable to have the model specify a path for such lines so that they
completely cover a particular set of pixels to help increase their crispness.
Java 2D API maintains compatibility with JDK 1.1 rendering behavior, such
that legacy operations and existing renderer behavior is unchanged under Java 2D
API. Legacy methods that map onto general draw
and
fill
methods are defined, which clearly indicates how
Graphics2D
extends Graphics
based on settings of
Stroke
and Transform
attributes and rendering hints.
The definition performs identically under default attribute settings. For
example, the default Stroke
is a BasicStroke
with a
width of 1 and no dashing and the default Transform for screen drawing is an
Identity transform.
The following two rules provide predictable rendering behavior whether aliasing or antialiasing is being used.
BasicStroke
object may be
"normalized" to provide consistent rendering of the outlines when positioned
at various points on the drawable and whether drawn with aliased or
antialiased rendering. This normalization process is controlled by the KEY_STROKE_CONTROL
hint. The exact normalization algorithm is not specified, but the goals of
this normalization are to ensure that lines are rendered with consistent
visual appearance regardless of how they fall on the pixel grid and to promote
more solid horizontal and vertical lines in antialiased mode so that they
resemble their non-antialiased counterparts more closely. A typical
normalization step might promote antialiased line endpoints to pixel centers
to reduce the amount of blending or adjust the subpixel positioning of
non-antialiased lines so that the floating point line widths round to even or
odd pixel counts with equal likelihood. This process can move endpoints by up
to half a pixel (usually towards positive infinity along both axes) to promote
these consistent results. The following definitions of general legacy methods perform identically to previously specified behavior under default attribute settings:
fill
operations, including fillRect
,
fillRoundRect
, fillOval
, fillArc
,
fillPolygon
, and clearRect
, fill
can now be called with the desired Shape
. For example, when
filling a rectangle: fill(new Rectangle(x, y, w, h));is called.
drawLine
,
drawRect
, drawRoundRect
, drawOval
,
drawArc
, drawPolyline
, and drawPolygon
,
draw
can now be called with the desired Shape
. For example, when
drawing a rectangle: draw(new Rectangle(x, y, w, h));is called.
draw3DRect
and fill3DRect
methods were
implemented in terms of the drawLine
and fillRect
methods in the Graphics
class which would predicate their
behavior upon the current Stroke
and Paint
objects
in a Graphics2D
context. This class overrides those
implementations with versions that use the current Color
exclusively, overriding the current Paint
and which uses
fillRect
to describe the exact same behavior as the preexisting
methods regardless of the setting of the current Stroke
.
Graphics
class defines only the setColor
method to control the color to be painted. Since the Java 2D API extends the
Color
object to implement the new Paint
interface, the
existing setColor
method is now a convenience method for setting
the current Paint
attribute to a Color
object.
setColor(c)
is equivalent to setPaint(c)
.
The Graphics
class defines two methods for controlling how
colors are applied to the destination.
setPaintMode
method is implemented as a convenience
method to set the default Composite
, equivalent to
setComposite(new AlphaComposite.SrcOver)
.
setXORMode(Color xorcolor)
method is implemented as a
convenience method to set a special Composite
object that ignores
the Alpha
components of source colors and sets the destination
color to the value: dstpixel = (PixelOf(srccolor) ^ PixelOf(xorcolor) ^ dstpixel);
RenderingHints
Constructor Summary | |
protected
|
Graphics2D()
Constructs a new Graphics2D object. |
Method Summary | |
abstract
void |
addRenderingHints(Map hints)
Sets the values of an arbitrary number of preferences for the rendering algorithms. |
abstract
void |
clip(Shape s)
Intersects the current Clip with the interior of the specified
Shape and sets the Clip to the resulting
intersection. |
abstract
void |
draw(Shape s)
Strokes the outline of a Shape using the settings of the current
Graphics2D context. |
void |
draw3DRect(int x,
int y, int width, int height, boolean raised)
Draws a 3-D highlighted outline of the specified rectangle. |
abstract
void |
drawGlyphVector(GlyphVector g,
float x, float y)
Renders the text of the specified GlyphVector
using the Graphics2D context's rendering attributes. |
abstract
void |
drawImage(BufferedImage img,
BufferedImageOp op,
int x, int y)
Renders a BufferedImage that is filtered with a BufferedImageOp . |
abstract
boolean |
drawImage(Image img,
AffineTransform xform,
ImageObserver obs)
Renders an image, applying a transform from image space into user space before drawing. |
abstract
void |
drawRenderableImage(RenderableImage img,
AffineTransform xform)
Renders a RenderableImage ,
applying a transform from image space into user space before
drawing. |
abstract
void |
drawRenderedImage(RenderedImage img,
AffineTransform xform)
Renders a RenderedImage ,
applying a transform from image space into user space before
drawing. |
abstract
void |
drawString(AttributedCharacterIterator iterator,
float x, float y)
Renders the text of the specified iterator, using the Graphics2D
context's current Paint . |
abstract
void |
drawString(AttributedCharacterIterator iterator,
int x, int y)
Renders the text of the specified iterator, using the Graphics2D
context's current Paint . |
abstract
void |
drawString(String s,
float x, float y)
Renders the text specified by the specified String , using the current
Font and Paint attributes in the
Graphics2D context. |
abstract
void |
drawString(String str,
int x, int y)
Renders the text of the specified String , using the current
Font and Paint attributes in the
Graphics2D context. |
abstract
void |
fill(Shape s)
Fills the interior of a Shape using the settings of the
Graphics2D context. |
void |
fill3DRect(int x,
int y, int width, int height, boolean raised)
Paints a 3-D highlighted rectangle filled with the current color. |
abstract
Color |
getBackground()
Returns the background color used for clearing a region. |
abstract
Composite |
getComposite()
Returns the current Composite in the Graphics2D
context. |
abstract
GraphicsConfiguration |
getDeviceConfiguration()
Returns the device configuration associated with this Graphics2D . |
abstract
FontRenderContext |
getFontRenderContext()
Get the rendering context of the Font within this
Graphics2D context. |
abstract
Paint |
getPaint()
Returns the current Paint of the Graphics2D
context. |
abstract
Object |
getRenderingHint(RenderingHints.Key hintKey)
Returns the value of a single preference for the rendering algorithms. |
abstract
RenderingHints |
getRenderingHints()
Gets the preferences for the rendering algorithms. |
abstract
Stroke |
getStroke()
Returns the current Stroke in the Graphics2D
context. |
abstract
AffineTransform |
getTransform()
Returns a copy of the current Transform in the Graphics2D
context. |
abstract
boolean |
hit(Rectangle rect,
Shape s,
boolean onStroke)
Checks whether or not the specified Shape intersects the specified
Rectangle ,
which is in device space. |
abstract
void |
rotate(double theta)
Concatenates the current Graphics2D Transform with a rotation
transform. |
abstract
void |
rotate(double theta,
double x, double y)
Concatenates the current Graphics2D Transform with a
translated rotation transform. |
abstract
void |
scale(double sx,
double sy)
Concatenates the current Graphics2D Transform with a scaling
transformation Subsequent rendering is resized according to the specified
scaling factors relative to the previous scaling. |
abstract
void |
setBackground(Color color)
Sets the background color for the Graphics2D context. |
abstract
void |
setComposite(Composite comp)
Sets the Composite for the Graphics2D context. |
abstract
void |
setPaint(Paint paint)
Sets the Paint attribute for the Graphics2D
context. |
abstract
void |
setRenderingHint(RenderingHints.Key hintKey,
Object hintValue)
Sets the value of a single preference for the rendering algorithms. |
abstract
void |
setRenderingHints(Map hints)
Replaces the values of all preferences for the rendering algorithms with the specified hints . |
abstract
void |
setStroke(Stroke s)
Sets the Stroke for the Graphics2D context. |
abstract
void |
setTransform(AffineTransform Tx)
Sets the Transform in the Graphics2D context. |
abstract
void |
shear(double shx,
double shy)
Concatenates the current Graphics2D Transform with a shearing
transform. |
abstract
void |
transform(AffineTransform Tx)
Composes an AffineTransform object with the Transform in
this Graphics2D according to the rule
last-specified-first-applied. |
abstract
void |
translate(double tx,
double ty)
Concatenates the current Graphics2D Transform with a
translation transform. |
abstract
void |
translate(int x,
int y)
Translates the origin of the Graphics2D context to the point
(x, y) in the current coordinate
system. |
Methods inherited from class java.awt.Graphics |
clearRect,
clipRect,
copyArea,
create,
create,
dispose,
drawArc,
drawBytes,
drawChars,
drawImage,
drawImage,
drawImage,
drawImage,
drawImage,
drawImage,
drawLine,
drawOval,
drawPolygon,
drawPolygon,
drawPolyline,
drawRect,
drawRoundRect,
fillArc,
fillOval,
fillPolygon,
fillPolygon,
fillRect,
fillRoundRect,
finalize,
getClip,
getClipBounds,
getClipBounds,
getClipRect,
getColor,
getFont,
getFontMetrics,
getFontMetrics,
hitClip,
setClip,
setClip,
setColor,
setFont,
setPaintMode,
setXORMode,
toString |
Methods inherited from class java.lang.Object |
clone,
equals,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait |
Constructor Detail |
protected Graphics2D()
Graphics2D
object. Since
Graphics2D
is an abstract class, and since it must be customized
by subclasses for different output devices, Graphics2D
objects
cannot be created directly. Instead, Graphics2D
objects must be
obtained from another Graphics2D
object, created by a
Component
, or obtained from images such as BufferedImage
objects.
Component.getGraphics()
,
Graphics.create()
Method Detail |
public void draw3DRect(int x, int y, int width, int height, boolean raised)
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. This method uses the current
Color
exclusively and ignores the current Paint
.
draw3DRect
in class Graphics
x, y
- the coordinates of the rectangle to be drawn.
width
- the width of the rectangle to be drawn.
height
- the height of the rectangle to be drawn.
raised
- a boolean that determines whether the rectangle
appears to be raised above the surface or sunk into the surface.
Graphics.fill3DRect(int,
int, int, int, boolean)
public void fill3DRect(int x, int y, int width, int height, boolean raised)
Color
. This method uses the current Color
exclusively and ignores the current Paint
.
fill3DRect
in class Graphics
x, y
- the coordinates of the rectangle to be filled.
width
- the width of the rectangle to be filled.
height
- the height of the rectangle to be filled.
raised
- a boolean value that determines whether the
rectangle appears to be raised above the surface or etched into the surface.
Graphics.draw3DRect(int,
int, int, int, boolean)
public abstract void draw(Shape s)
Shape
using the settings of the
current Graphics2D
context. The rendering attributes applied
include the Clip
, Transform
, Paint
,
Composite
and Stroke
attributes.
s
- the Shape
to be rendered
setStroke(java.awt.Stroke)
,
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
, setComposite(java.awt.Composite)
public abstract boolean drawImage(Image img, AffineTransform xform, ImageObserver obs)
Transform
in the Graphics2D
. The
specified transformation is applied to the image before the transform
attribute in the Graphics2D
context is applied. The rendering
attributes applied include the Clip
, Transform
, and
Composite
attributes. Note that no rendering is done if the
specified transform is noninvertible.
img
- the Image
to be rendered
xform
- the transformation from image space into user space
obs
- the ImageObserver
to be notified as more of the Image
is converted
true
if the Image
is fully loaded and
completely rendered; false
if the Image
is still
being loaded.
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawImage(BufferedImage img, BufferedImageOp op, int x, int y)
BufferedImage
that is filtered with a BufferedImageOp
.
The rendering attributes applied include the Clip
,
Transform
and Composite
attributes. This is
equivalent to: img1 = op.filter(img, null); drawImage(img1, new AffineTransform(1f,0f,0f,1f,x,y), null);
op
- the filter to be applied to the image before rendering
img
- the BufferedImage
to be rendered
x, y
- the location in user space where the upper left
corner of the image is rendered
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawRenderedImage(RenderedImage img, AffineTransform xform)
RenderedImage
,
applying a transform from image space into user space before drawing. The
transformation from user space into device space is done with the current
Transform
in the Graphics2D
. The specified
transformation is applied to the image before the transform attribute in the
Graphics2D
context is applied. The rendering attributes applied
include the Clip
, Transform
, and
Composite
attributes. Note that no rendering is done if the
specified transform is noninvertible.
img
- the image to be rendered
xform
- the transformation from image space into user space
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawRenderableImage(RenderableImage img, AffineTransform xform)
RenderableImage
,
applying a transform from image space into user space before drawing. The
transformation from user space into device space is done with the current
Transform
in the Graphics2D
. The specified
transformation is applied to the image before the transform attribute in the
Graphics2D
context is applied. The rendering attributes applied
include the Clip
, Transform
, and
Composite
attributes. Note that no rendering is done if the
specified transform is noninvertible.
Rendering hints set on the Graphics2D
object might be used in
rendering the RenderableImage
. If explicit control is required
over specific hints recognized by a specific RenderableImage
, or
if knowledge of which hints are used is required, then a
RenderedImage
should be obtained directly from the
RenderableImage
and rendered using drawRenderedImage
.
img
- the image to be rendered
xform
- the transformation from image space into user space
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
, drawRenderedImage(java.awt.image.RenderedImage,
java.awt.geom.AffineTransform)
public abstract void drawString(String str, int x, int y)
String
, using the current
Font
and Paint
attributes in the
Graphics2D
context. The baseline of the first character is at
position (x, y) in the User Space. The rendering attributes
applied include the Clip
, Transform
,
Paint
, Font
and Composite
attributes.
For characters in script systems such as Hebrew and Arabic, the glyphs can be
rendered from right to left, in which case the coordinate supplied is the
location of the leftmost character on the baseline.
drawString
in class Graphics
str
- the string to be rendered
x, y
- the coordinates where the String
should be rendered
NullPointerException
- if str
is null
Graphics.drawBytes(byte[],
int, int, int, int)
, Graphics.drawChars(char[],
int, int, int, int)
public abstract void drawString(String s, float x, float y)
String
, using the
current Font
and Paint
attributes in the
Graphics2D
context. The baseline of the first character is at
position (x, y) in the User Space. The rendering attributes
applied include the Clip
, Transform
,
Paint
, Font
and Composite
attributes.
For characters in script systems such as Hebrew and Arabic, the glyphs can be
rendered from right to left, in which case the coordinate supplied is the
location of the leftmost character on the baseline.
s
- the String
to be rendered
x, y
- the coordinates where the String
should be rendered
NullPointerException
- if str
is null
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
Graphics.setFont(java.awt.Font)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawString(AttributedCharacterIterator iterator, int x, int y)
Graphics2D
context's current Paint
. The iterator has
to specify a font for each character. The baseline of the first character is
at position (x, y) in the User Space. The rendering
attributes applied include the Clip
, Transform
,
Paint
, and Composite
attributes. For characters in
script systems such as Hebrew and Arabic, the glyphs can be rendered from
right to left, in which case the coordinate supplied is the location of the
leftmost character on the baseline.
drawString
in class Graphics
iterator
- the iterator whose text is to be rendered
x, y
- the coordinates where the iterator's text is to
be rendered
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawString(AttributedCharacterIterator iterator, float x, float y)
Graphics2D
context's current Paint
. The iterator
must specify a font for each character. The baseline of the first character is
at position (x, y) in the User Space. The rendering
attributes applied include the Clip
, Transform
,
Paint
, and Composite
attributes. For characters in
script systems such as Hebrew and Arabic, the glyphs can be rendered from
right to left, in which case the coordinate supplied is the location of the
leftmost character on the baseline.
iterator
- the iterator whose text is to be rendered
x, y
- the coordinates where the iterator's text is to
be rendered
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
Graphics.setClip(int,
int, int, int)
public abstract void drawGlyphVector(GlyphVector g, float x, float y)
GlyphVector
using the Graphics2D
context's rendering attributes. The
rendering attributes applied include the Clip
,
Transform
, Paint
, and Composite
attributes. The GlyphVector
specifies individual glyphs from a Font
.
The GlyphVector
can also contain the glyph positions. This is the
fastest way to render a set of characters to the screen.
g
- the GlyphVector
to be rendered
x, y
- the position in User Space where the glyphs
should be rendered
GlyphVector
,
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
Graphics.setClip(int,
int, int, int)
public abstract void fill(Shape s)
Shape
using the settings of the
Graphics2D
context. The rendering attributes applied include the
Clip
, Transform
, Paint
, and
Composite
.
s
- the Shape
to be filled
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
,
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
setComposite(java.awt.Composite)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
public abstract boolean hit(Rectangle rect, Shape s, boolean onStroke)
Shape
intersects the
specified Rectangle
,
which is in device space. If onStroke
is false, this method
checks whether or not the interior of the specified Shape
intersects the specified Rectangle
. If onStroke
is
true
, this method checks whether or not the Stroke
of the specified Shape
outline intersects the specified
Rectangle
. The rendering attributes taken into account include
the Clip
, Transform
, and Stroke
attributes.
rect
- the area in device space to check for a hit
s
- the Shape
to check for a hit
onStroke
- flag used to choose between testing the stroked
or the filled shape. If the flag is true
, the
Stroke
oultine is tested. If the flag is false
,
the filled Shape
is tested.
true
if there is a hit; false
otherwise.
setStroke(java.awt.Stroke)
,
fill(java.awt.Shape)
,
draw(java.awt.Shape)
,
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
,
clip(java.awt.Shape)
,
Graphics.setClip(int,
int, int, int)
public abstract GraphicsConfiguration getDeviceConfiguration()
Graphics2D
.public abstract void setComposite(Composite comp)
Composite
for the Graphics2D
context.
The Composite
is used in all drawing methods such as
drawImage
, drawString
, draw
, and
fill
. It specifies how new pixels are to be combined with the
existing pixels on the graphics device during the rendering process.
If this Graphics2D
context is drawing to a
Component
on the display screen and the Composite
is
a custom object rather than an instance of the AlphaComposite
class, and if there is a security manager, its checkPermission
method is called with an AWTPermission("readDisplayPixels")
permission.
comp
- the Composite
object to be used for
rendering
SecurityException
- if a custom Composite
object is being used to render to the
screen and a security manager is set and its checkPermission
method does not allow the operation.
Graphics.setXORMode(java.awt.Color)
,
Graphics.setPaintMode()
,
AlphaComposite
,
SecurityManager.checkPermission(java.security.Permission)
,
AWTPermission
public abstract void setPaint(Paint paint)
Paint
attribute for the Graphics2D
context. Calling this method with a null
Paint
object does not have any effect on the current Paint
attribute of
this Graphics2D
.
paint
- the Paint
object to be used to
generate color during the rendering process, or null
Graphics.setColor(java.awt.Color)
,
GradientPaint
,
TexturePaint
public abstract void setStroke(Stroke s)
Stroke
for the Graphics2D
context.
s
- the Stroke
object to be used to stroke a
Shape
during the rendering process
BasicStroke
public abstract void setRenderingHint(RenderingHints.Key hintKey, Object hintValue)
RenderingHints
class for definitions of some common keys and values.
hintKey
- the key of the hint to be set.
hintValue
- the value indicating preferences for the
specified hint category.
RenderingHints
public abstract Object getRenderingHint(RenderingHints.Key hintKey)
RenderingHints
class for definitions of some common keys and
values.
hintKey
- the key corresponding to the hint to get.
RenderingHints
class.
RenderingHints
public abstract void setRenderingHints(Map hints)
hints
. The existing values for all rendering hints
are discarded and the new set of known hints and values are initialized from
the specified Map
object. Hint categories include controls for rendering quality and overall
time/quality trade-off in the rendering process. Refer to the
RenderingHints
class for definitions of some common keys and
values.
hints
- the rendering hints to be set
RenderingHints
public abstract void addRenderingHints(Map hints)
Map
object are modified. All other preferences not
present in the specified object are left unmodified. Hint categories include
controls for rendering quality and overall time/quality trade-off in the
rendering process. Refer to the RenderingHints
class for
definitions of some common keys and values.
hints
- the rendering hints to be set
RenderingHints
public abstract RenderingHints getRenderingHints()
RenderingHints
class for
definitions of some common keys and values.
RenderingHints
that contains
the current preferences.
RenderingHints
public abstract void translate(int x, int y)
Graphics2D
context to the point
(x, y) in the current coordinate system. Modifies the
Graphics2D
context so that its new origin corresponds to the
point (x, y) in the Graphics2D
context's
former coordinate system. All coordinates used in subsequent rendering
operations on this graphics context are relative to this new origin.
translate
in class Graphics
x, y
- the specified coordinates
public abstract void translate(double tx, double ty)
Graphics2D
Transform
with a translation transform. Subsequent rendering is translated by the
specified distance relative to the previous position. This is equivalent to
calling transform(T), where T is an AffineTransform
represented
by the following matrix: [ 1 0 tx ] [ 0 1 ty ] [ 0 0 1 ]
tx
- the distance to translate along the x-axis
ty
- the distance to translate along the
y-axispublic abstract void rotate(double theta)
Graphics2D
Transform
with a rotation transform. Subsequent rendering is rotated by the specified
radians relative to the previous origin. This is equivalent to calling
transform(R)
, where R is an AffineTransform
represented by the following matrix: [ cos(theta) -sin(theta) 0 ] [ sin(theta) cos(theta) 0 ] [ 0 0 1 ]Rotating with a positive angle theta rotates points on the positive x axis toward the positive y axis.
theta
- the angle of rotation in radianspublic abstract void rotate(double theta, double x, double y)
Graphics2D
Transform
with a translated rotation transform. Subsequent rendering is transformed by a
transform which is constructed by translating to the specified location,
rotating by the specified radians, and translating back by the same amount as
the original translation. This is equivalent to the following sequence of
calls: translate(x, y); rotate(theta); translate(-x, -y);Rotating with a positive angle theta rotates points on the positive x axis toward the positive y axis.
theta
- the angle of rotation in radians
x, y
- coordinates of the origin of the
rotationpublic abstract void scale(double sx, double sy)
Graphics2D
Transform
with a scaling transformation Subsequent rendering is resized according to the
specified scaling factors relative to the previous scaling. This is equivalent
to calling transform(S)
, where S is an
AffineTransform
represented by the following matrix: [ sx 0 0 ] [ 0 sy 0 ] [ 0 0 1 ]
sx
- the amount by which X coordinates in subsequent
rendering operations are multiplied relative to previous rendering
operations.
sy
- the amount by which Y coordinates in subsequent
rendering operations are multiplied relative to previous rendering
operations.public abstract void shear(double shx, double shy)
Graphics2D
Transform
with a shearing transform. Subsequent renderings are sheared by the specified
multiplier relative to the previous position. This is equivalent to calling
transform(SH)
, where SH is an AffineTransform
represented by the following matrix: [ 1 shx 0 ] [ shy 1 0 ] [ 0 0 1 ]
shx
- the multiplier by which coordinates are shifted in
the positive X axis direction as a function of their Y coordinate
shy
- the multiplier by which coordinates are shifted in
the positive Y axis direction as a function of their X
coordinatepublic abstract void transform(AffineTransform Tx)
AffineTransform
object with the
Transform
in this Graphics2D
according to the rule
last-specified-first-applied. If the current Transform
is Cx, the
result of composition with Tx is a new Transform
Cx'. Cx' becomes
the current Transform
for this Graphics2D
.
Transforming a point p by the updated Transform
Cx' is equivalent
to first transforming p by Tx and then transforming the result by the original
Transform
Cx. In other words, Cx'(p) = Cx(Tx(p)). A copy of the
Tx is made, if necessary, so further modifications to Tx do not affect
rendering.
Tx
- the AffineTransform
object to be composed
with the current Transform
setTransform(java.awt.geom.AffineTransform)
,
AffineTransform
public abstract void setTransform(AffineTransform Tx)
Transform
in the Graphics2D
context.
Tx
- the AffineTransform
object to be used in
the rendering process
transform(java.awt.geom.AffineTransform)
,
AffineTransform
public abstract AffineTransform getTransform()
Transform
in the
Graphics2D
context.
AffineTransform
in the Graphics2D
context.
transform(java.awt.geom.AffineTransform)
,
setTransform(java.awt.geom.AffineTransform)
public abstract Paint getPaint()
Paint
of the Graphics2D
context.
Graphics2D
Paint
, which defines a
color or pattern.
setPaint(java.awt.Paint)
,
Graphics.setColor(java.awt.Color)
public abstract Composite getComposite()
Composite
in the Graphics2D
context.
Graphics2D
Composite
, which
defines a compositing style.
setComposite(java.awt.Composite)
public abstract void setBackground(Color color)
Graphics2D
context. The
background color is used for clearing a region. When a Graphics2D
is constructed for a Component
, the background color is inherited
from the Component
. Setting the background color in the
Graphics2D
context only affects the subsequent
clearRect
calls and not the background color of the
Component
. To change the background of the
Component
, use appropriate methods of the Component
.
color
- the background color that isused in subsequent
calls to clearRect
getBackground()
,
Graphics.clearRect(int,
int, int, int)
public abstract Color getBackground()
Graphics2D
Color
, which defines
the background color.
setBackground(java.awt.Color)
public abstract Stroke getStroke()
Stroke
in the Graphics2D
context.
Graphics2D
Stroke
, which defines
the line style.
setStroke(java.awt.Stroke)
public abstract void clip(Shape s)
Clip
with the interior of the
specified Shape
and sets the Clip
to the resulting
intersection. The specified Shape
is transformed with the current
Graphics2D
Transform
before being intersected with
the current Clip
. This method is used to make the current
Clip
smaller. To make the Clip
larger, use
setClip
. The user clip modified by this method is
independent of the clipping associated with device bounds and visibility. If
no clip has previously been set, or if the clip has been cleared using setClip
with a null
argument, the specified Shape
becomes
the new user clip.
s
- the Shape
to be intersected with the
current Clip
. If s
is null
, this
method clears the current Clip
.public abstract FontRenderContext getFontRenderContext()
Font
within this
Graphics2D
context. The FontRenderContext
encapsulates application hints such as anti-aliasing and fractional metrics,
as well as target device specific information such as dots-per-inch. This
information should be provided by the application when using objects that
perform typographical formatting, such as Font
and
TextLayout
. This information should also be provided by
applications that perform their own layout and need accurate measurements of
various characteristics of glyphs such as advance and line height when various
rendering hints have been applied to the text rendering.
FontRenderContext
,
Font.createGlyphVector(java.awt.font.FontRenderContext,
java.lang.String)
, TextLayout
Maintained by John Loomis, last updated 1 June 2000