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java.awt.font
Class FontRenderContext
java.lang.Object
java.awt.font.FontRenderContext
-
public class FontRenderContext
- extends Object
The FontRenderContext class is a container for the information needed to correctly measure text. The measurement of text can vary because of rules that map outlines to pixels, and rendering hints provided by an application.
One such piece of information is a transform that scales typographical points to pixels. (A point is defined to be exactly 1/72 of an inch, which is slightly different than the traditional mechanical measurement of a point.) A character that is rendered at 12pt on a 600dpi device might have a different size than the same character rendered at 12pt on a 72dpi device because of such factors as rounding to pixel boundaries and hints that the font designer may have specified.
Anti-aliasing and Fractional-metrics specified by an application can also affect the size of a character because of rounding to pixel boundaries.
Typically, instances of FontRenderContext are obtained from a
Graphics2D
object. A FontRenderContext which is directly constructed will most likely not represent any actual graphics device, and may lead to unexpected or incorrect results.
-
See Also:
-
RenderingHints.KEY_TEXT_ANTIALIASING
,
RenderingHints.KEY_FRACTIONALMETRICS
,
Graphics2D.getFontRenderContext()
,
LineMetrics
Method Summary
|
boolean |
equals
(
FontRenderContext
rhs)
Return true if rhs has the same transform, antialiasing, and fractional metrics values as this. |
boolean |
equals
(
Object
obj)
Return true if obj is an instance of FontRenderContext and has the same transform, antialiasing, and fractional metrics values as this. |
Object
|
getAntiAliasingHint
()
Return the text anti-aliasing rendering mode hint used in this FontRenderContext.
|
Object
|
getFractionalMetricsHint
()
Return the text fractional metrics rendering mode hint used in this FontRenderContext.
|
AffineTransform
|
getTransform
()
Gets the transform that is used to scale typographical points to pixels in this FontRenderContext. |
int
|
getTransformType
()
Returns the integer type of the affine transform for this FontRenderContext as specified by java.awt.geom.AffineTransform.getType()
|
int |
hashCode
()
Return a hashcode for this FontRenderContext. |
boolean |
isAntiAliased
()
Returns a boolean which indicates whether or not some form of antialiasing is specified by
Gets the text anti-aliasing mode used in
this FontRenderContext. |
boolean
|
isTransformed
()
Indicates whether or not this FontRenderContext object measures text in a transformed render context.
|
boolean
|
usesFractionalMetrics
()
Gets the text fractional metrics mode requested by the application for use in this FontRenderContext.
|
boolean
|
usesFractionalMetrics
()
Returns a boolean which whether text fractional metrics mode is used in this FontRenderContext.
|
FontRenderContext
protected FontRenderContext()
-
Constructs a new FontRenderContext object.
FontRenderContext
public FontRenderContext(AffineTransform tx,
boolean isAntiAliased,
boolean usesFractionalMetrics)
-
Constructs a FontRenderContext object from an optional
AffineTransform
and two boolean values that determine if the newly constructed object has anti-aliasing or fractional metrics.
In each case the boolean values true and false correspond to the rendering hint values ON and OFF respectively.
To specify other hint values, use the constructor which specifies the rendering hint values as parameters :
FontRenderContext(AffineTransform, Object, Object)
.
-
Parameters:
-
tx - the transform which is used to scale typographical points to pixels in this FontRenderContext. If null, an identity
transform
tranform
is used. -
isAntiAliased - determines if the newly
constructed
contructed
object has
anti-aliasing.
anti-aliasing
-
usesFractionalMetrics - determines if the newly constructed object
has
uses
fractional
metrics.
metrics
FontRenderContext
public FontRenderContext ( AffineTransform tx,
Object aaHint,
Object fmHint)
-
Constructs a FontRenderContext object from an optional
AffineTransform
and two Object values that determine if the newly constructed object has anti-aliasing or fractional metrics.
-
Parameters:
-
tx - the transform which is used to scale typographical points to pixels in this FontRenderContext. If null, an identity tranform is used.
-
aaHint - - one of the text antialiasing rendering hint values defined in
java.awt.RenderingHints
. Any other value will throw IllegalArgumentException.
VALUE_TEXT_ANTIALIAS_DEFAULT
may be specified, in which case the mode used is implementation dependent.
-
fmHint - - one of the text fractional rendering hint values defined in
java.awt.RenderingHints
.
VALUE_FRACTIONALMETRICS_DEFAULT
may be specified, in which case the mode used is implementation dependent. Any other value will throw IllegalArgumentException
-
Throws:
-
IllegalArgumentException
- if the hints are not one of the legal values.
-
Since:
-
1.6
isTransformed
public boolean isTransformed ()
-
Indicates whether or not this FontRenderContext object measures text in a transformed render context.
-
-
Returns:
-
true if this FontRenderContext object has a non-identity AffineTransform attribute. false otherwise.
-
Since:
-
1.6
-
See Also:
-
getTransform()
getTransformType
public int getTransformType ()
-
Returns the integer type of the affine transform for this FontRenderContext as specified by java.awt.geom.AffineTransform.getType()
-
-
Returns:
-
the type of the transform.
-
Since:
-
1.6
-
See Also:
-
AffineTransform
getTransform
public AffineTransform getTransform()
-
Gets the transform that is used to scale typographical points to pixels in this FontRenderContext.
-
-
Returns:
-
the AffineTransform of this FontRenderContext.
-
See Also:
-
AffineTransform
isAntiAliased
public boolean isAntiAliased()
-
Returns a boolean which indicates whether or not some form of antialiasing is specified by this FontRenderContext. Call
getAntiAliasingHint()
for the specific rendering hint value.
Gets the text anti-aliasing mode used in this FontRenderContext.
-
-
Returns:
-
true, if text is anti-aliased in this FontRenderContext; false otherwise.
-
See Also:
-
RenderingHints.KEY_TEXT_ANTIALIASING
,
FontRenderContext(AffineTransform,boolean,boolean)
,
FontRenderContext(AffineTransform,Object,Object)
usesFractionalMetrics
public boolean usesFractionalMetrics()
-
Returns a boolean which whether text fractional metrics mode is used in this FontRenderContext. Call
getFractionalMetricsHint()
to obtain the corresponding rendering hint value.
Gets the text fractional metrics mode requested by the application for use in this FontRenderContext.
-
-
Returns:
-
true, if layout should be performed with fractional metrics; false otherwise. in this FontRenderContext.
-
See Also:
-
RenderingHints.KEY_FRACTIONALMETRICS
,
FontRenderContext(AffineTransform,boolean,boolean)
,
FontRenderContext(AffineTransform,Object,Object)
getAntiAliasingHint
public ObjectgetAntiAliasingHint ()
-
Return the text anti-aliasing rendering mode hint used in this FontRenderContext. This will be one of the text antialiasing rendering hint values defined in
java.awt.RenderingHints
.
-
-
Returns:
-
text anti-aliasing rendering mode hint used in this FontRenderContext.
-
Since:
-
1.6
getFractionalMetricsHint
public ObjectgetFractionalMetricsHint ()
-
Return the text fractional metrics rendering mode hint used in this FontRenderContext. This will be one of the text fractional metrics rendering hint values defined in
java.awt.RenderingHints
.
-
-
Returns:
-
the text fractional metrics rendering mode hint used in this FontRenderContext.
-
Since:
-
1.6
equals
public boolean equals(Object obj)
-
Return true if obj is an instance of FontRenderContext and has the same transform, antialiasing, and fractional metrics values as this.
-
-
Overrides:
-
equals
in class
Object
-
-
Parameters:
-
obj - the object to test for equality
-
Returns:
-
true if the specified object is equal to this FontRenderContext; false otherwise.
-
See Also:
-
Object.hashCode()
,
Hashtable
equals
public boolean equals(FontRenderContext rhs)
-
Return true if rhs has the same transform, antialiasing, and fractional metrics values as this.
-
-
Parameters:
-
rhs - the FontRenderContext to test for equality
-
Returns:
-
true if rhs is equal to this FontRenderContext; false otherwise.
hashCode
public int hashCode()
-
Return a hashcode for this FontRenderContext.
-
-
Overrides:
-
hashCode
in class
Object
-
-
Returns:
-
a hash code value for this object.
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable