public class GraphicContext
extends java.lang.Object
implements java.lang.Cloneable
| Modifier and Type | Field and Description |
|---|---|
protected java.awt.Color |
background
Current background color.
|
protected java.awt.Shape |
clip
Current clip
|
protected java.awt.Composite |
composite
Current Composite
|
protected java.awt.geom.AffineTransform |
defaultTransform
Default Transform to be used for creating FontRenderContext.
|
protected java.awt.Font |
font
Current Font
|
protected java.awt.Color |
foreground
Current foreground color
|
protected java.awt.RenderingHints |
hints
Current set of RenderingHints
|
protected java.awt.Paint |
paint
Current Paint
|
protected java.awt.Stroke |
stroke
Current Stroke
|
protected java.awt.geom.AffineTransform |
transform
Current AffineTransform.
|
protected java.util.List |
transformStack
Transform stack
|
protected boolean |
transformStackValid
Defines whether the transform stack is valid or not.
|
| Modifier | Constructor and Description |
|---|---|
|
GraphicContext()
Default constructor
|
|
GraphicContext(java.awt.geom.AffineTransform defaultDeviceTransform) |
protected |
GraphicContext(GraphicContext template)
Copy constructor.
|
| Modifier and Type | Method and Description |
|---|---|
void |
addRenderingHints(java.util.Map<java.lang.String,java.lang.Object> hints)
Sets the values of an arbitrary number of preferences for the
rendering algorithms.
|
void |
clip(java.awt.Shape s)
Intersects the current
Clip with the interior of the
specified Shape and sets the Clip to the
resulting intersection. |
void |
clipRect(int x,
int y,
int width,
int height)
Intersects the current clip with the specified rectangle.
|
java.lang.Object |
clone() |
java.awt.Color |
getBackground()
Returns the background color used for clearing a region.
|
java.awt.Shape |
getClip()
Gets the current clipping area.
|
java.awt.Rectangle |
getClipBounds()
Returns the bounding rectangle of the current clipping area.
|
java.awt.Color |
getColor()
Gets this graphics context's current color.
|
java.awt.Composite |
getComposite()
Returns the current
Composite in the
Graphics2D context. |
java.awt.Font |
getFont()
Gets the current font.
|
java.awt.font.FontRenderContext |
getFontRenderContext()
Get the rendering context of the
Font within this
Graphics2D context. |
java.awt.Paint |
getPaint()
Returns the current
Paint of the
Graphics2D context. |
java.lang.Object |
getRenderingHint(java.awt.RenderingHints.Key hintKey)
Returns the value of a single preference for the rendering algorithms.
|
java.awt.RenderingHints |
getRenderingHints()
Gets the preferences for the rendering algorithms.
|
java.awt.Stroke |
getStroke()
Returns the current
Stroke in the
Graphics2D context. |
java.awt.geom.AffineTransform |
getTransform()
Returns a copy of the current
Transform in the
Graphics2D context. |
TransformStackElement[] |
getTransformStack() |
protected void |
invalidateTransformStack()
Marks the GraphicContext's isNewTransformStack to true
as a memento that the current transform stack was reset
since it was last read.
|
boolean |
isTransformStackValid()
Checks the status of the transform stack.
|
void |
rotate(double theta)
Concatenates the current
Graphics2D
Transform with a rotation transform. |
void |
rotate(double theta,
double x,
double y)
Concatenates the current
Graphics2D
Transform with a translated rotation
transform. |
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. |
void |
setBackground(java.awt.Color color)
Sets the background color for the
Graphics2D context. |
void |
setClip(int x,
int y,
int width,
int height)
Sets the current clip to the rectangle specified by the given
coordinates.
|
void |
setClip(java.awt.Shape clip)
Sets the current clipping area to an arbitrary clip shape.
|
void |
setColor(java.awt.Color c)
Sets this graphics context's current color to the specified
color.
|
void |
setComposite(java.awt.Composite comp)
Sets the
Composite for the Graphics2D context. |
void |
setFont(java.awt.Font font)
Sets this graphics context's font to the specified font.
|
void |
setPaint(java.awt.Paint paint)
Sets the
Paint attribute for the
Graphics2D context. |
void |
setRenderingHint(java.awt.RenderingHints.Key hintKey,
java.lang.Object hintValue)
Sets the value of a single preference for the rendering algorithms.
|
void |
setRenderingHints(java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> hints)
Replaces the values of all preferences for the rendering
algorithms with the specified
hints. |
void |
setStroke(java.awt.Stroke s)
Sets the
Stroke for the Graphics2D context. |
void |
setTransform(java.awt.geom.AffineTransform tx)
Sets the
Transform in the Graphics2D
context. |
void |
shear(double shx,
double shy)
Concatenates the current
Graphics2D
Transform with a shearing transform. |
void |
transform(java.awt.geom.AffineTransform tx)
Composes an
AffineTransform object with the
Transform in this Graphics2D according
to the rule last-specified-first-applied. |
void |
translate(double tx,
double ty)
Concatenates the current
Graphics2D Transform
with a translation transform. |
void |
translate(int x,
int y)
Translates the origin of the graphics context to the point
(x, y) in the current coordinate system.
|
void |
validateTransformStack()
Marks the GraphicContext's isNewTransformStack to false
as a memento that the current transform stack was read and
has not been reset.
|
protected java.awt.geom.AffineTransform defaultTransform
protected java.awt.geom.AffineTransform transform
protected java.util.List transformStack
protected boolean transformStackValid
protected java.awt.Paint paint
protected java.awt.Stroke stroke
protected java.awt.Composite composite
protected java.awt.Shape clip
protected java.awt.RenderingHints hints
protected java.awt.Font font
protected java.awt.Color background
protected java.awt.Color foreground
public GraphicContext()
public GraphicContext(java.awt.geom.AffineTransform defaultDeviceTransform)
defaultDeviceTransform - Default affine transform applied to map the user space to the
user space.protected GraphicContext(GraphicContext template)
template - the instance to make a copy ofpublic java.lang.Object clone()
clone in class java.lang.Objectpublic java.awt.Color getColor()
Color,
Graphics.setColor(java.awt.Color)public void setColor(java.awt.Color c)
c - the new rendering color.Color,
Graphics.getColor()public java.awt.Font getFont()
Font,
Graphics.setFont(java.awt.Font)public void setFont(java.awt.Font font)
font - the font.Graphics.getFont()public java.awt.Rectangle getClipBounds()
setClip(null), this method returns
null.
The coordinates in the rectangle are relative to the coordinate
system origin of this graphics context.null if no clip is set.Graphics.getClip(),
Graphics.clipRect(int, int, int, int),
Graphics.setClip(int, int, int, int),
Graphics.setClip(Shape)public void clipRect(int x,
int y,
int width,
int height)
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.x - the x coordinate of the rectangle to intersect the clip withy - the y coordinate of the rectangle to intersect the clip withwidth - the width of the rectangle to intersect the clip withheight - the height of the rectangle to intersect the clip withsetClip(int, int, int, int),
setClip(Shape)public void setClip(int x,
int y,
int width,
int height)
x - the x coordinate of the new clip rectangle.y - the y coordinate of the new clip rectangle.width - the width of the new clip rectangle.height - the height of the new clip rectangle.Graphics.clipRect(int, int, int, int),
Graphics.setClip(Shape)public java.awt.Shape getClip()
setClip(null), this method returns
null.Shape object representing the
current clipping area, or null if
no clip is set.Graphics.getClipBounds(),
Graphics.clipRect(int, int, int, int),
Graphics.setClip(int, int, int, int),
Graphics.setClip(Shape)public void setClip(java.awt.Shape clip)
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.clip - the Shape to use to set the clipGraphics.getClip(),
Graphics.clipRect(int, int, int, int),
Graphics.setClip(int, int, int, int)public void setComposite(java.awt.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 renderingjava.lang.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(),
AlphaCompositepublic void setPaint(java.awt.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 nullGraphics.setColor(java.awt.Color),
GradientPaint,
TexturePaintpublic void setStroke(java.awt.Stroke s)
Stroke for the Graphics2D context.s - the Stroke object to be used to stroke a
Shape during the rendering processBasicStrokepublic void setRenderingHint(java.awt.RenderingHints.Key hintKey,
java.lang.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.RenderingHintspublic java.lang.Object getRenderingHint(java.awt.RenderingHints.Key hintKey)
RenderingHints class for definitions of some common
keys and values.hintKey - the key corresponding to the hint to get.RenderingHints class.RenderingHintspublic void setRenderingHints(java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> 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 setRenderingHintspublic void addRenderingHints(java.util.Map<java.lang.String,java.lang.Object> 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 setRenderingHintspublic java.awt.RenderingHints getRenderingHints()
RenderingHints class for definitions of some common
keys and values.RenderingHints
that contains the current preferences.RenderingHintspublic void translate(int x,
int y)
x - the x coordinate.y - the y coordinate.public 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-axisty - the distance to translate along the y-axispublic 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 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 radiansx - x coordinate of the origin of the rotationy - y coordinate of the origin of the rotationpublic 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 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 coordinateshy - the multiplier by which coordinates are shifted in
the positive Y axis direction as a function of their X coordinatepublic void transform(java.awt.geom.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 TransformsetTransform(java.awt.geom.AffineTransform),
AffineTransformpublic void setTransform(java.awt.geom.AffineTransform tx)
Transform in the Graphics2D
context.tx - the AffineTransform object to be used in the
rendering processtransform,
AffineTransformpublic void validateTransformStack()
public boolean isTransformStackValid()
public TransformStackElement[] getTransformStack()
protected void invalidateTransformStack()
public java.awt.geom.AffineTransform getTransform()
Transform in the
Graphics2D context.AffineTransform in the
Graphics2D context.transform,
setTransform(java.awt.geom.AffineTransform)public java.awt.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 java.awt.Composite getComposite()
Composite in the
Graphics2D context.Graphics2D Composite,
which defines a compositing style.setComposite(java.awt.Composite)public void setBackground(java.awt.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 clearRectgetBackground(),
Graphics.clearRect(int, int, int, int)public java.awt.Color getBackground()
Graphics2D Color,
which defines the background color.setBackground(java.awt.Color)public java.awt.Stroke getStroke()
Stroke in the
Graphics2D context.Graphics2D Stroke,
which defines the line style.setStroke(java.awt.Stroke)public void clip(java.awt.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 java.awt.font.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(FontRenderContext,char[]),
TextLayoutCopyright 1999-2025 The Apache Software Foundation. All Rights Reserved.