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JavaTM 2 Platform Std. Ed. v1.3.1 |
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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
| Constructor Summary | |
protected |
FontRenderContext()
Constructs a new FontRenderContext
object. |
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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. |
| Method Summary | |
AffineTransform |
getTransform()
Gets the transform that is used to scale typographical points to pixels in this FontRenderContext. |
boolean |
isAntiAliased()
Gets the text anti-aliasing mode used in this FontRenderContext. |
boolean |
usesFractionalMetrics()
Gets the text fractional metrics mode requested by the application for use in this FontRenderContext. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
FontRenderContext
protected FontRenderContext()
- Constructs a new
FontRenderContextobject.
FontRenderContext
public FontRenderContext(AffineTransform tx, boolean isAntiAliased, boolean usesFractionalMetrics)
- Constructs a
FontRenderContextobject from an optionalAffineTransformand twobooleanvalues 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 thisFontRenderContext. If null, an identity tranform is used.isAntiAliased- determines if the newly contructed object has anti-aliasingusesFractionalMetrics- determines if the newly constructed object uses fractional metrics
| Method Detail |
getTransform
public AffineTransform getTransform()
- Gets the transform that is used to scale typographical points
to pixels in this
FontRenderContext.- See Also:
AffineTransform
isAntiAliased
public boolean isAntiAliased()
- Gets the text anti-aliasing mode used in this
FontRenderContext.- See Also:
RenderingHints.KEY_TEXT_ANTIALIASING
usesFractionalMetrics
public boolean usesFractionalMetrics()
- Gets the text fractional metrics mode requested by the application
for use in this
FontRenderContext.- See Also:
RenderingHints.KEY_FRACTIONALMETRICS
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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