java.awt.RenderingHints
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Java™ Platform Standard Ed. 6 |
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java.lang.Object
public class RenderingHints
The RenderingHints class defines and manages collections of
keys and associated values which allow an application to provide input
into the choice of algorithms used by other classes which perform
rendering and image manipulation services.
The Graphics2D class, and classes that implement
BufferedImageOp and
RasterOp all provide methods to get and
possibly to set individual or groups of RenderingHints
keys and their associated values.
When those implementations perform any rendering or image manipulation
operations they should examine the values of any RenderingHints
that were requested by the caller and tailor the algorithms used
accordingly and to the best of their ability.
Note that since these keys and values are hints, there is
no requirement that a given implementation supports all possible
choices indicated below or that it can respond to requests to
modify its choice of algorithm.
The values of the various hint keys may also interact such that
while all variants of a given key are supported in one situation,
the implementation may be more restricted when the values associated
with other keys are modified.
For example, some implementations may be able to provide several
types of dithering when the antialiasing hint is turned off, but
have little control over dithering when antialiasing is on.
The full set of supported keys and hints may also vary by destination
since runtimes may use different underlying modules to render to
the screen, or to BufferedImage objects,
or while printing.
Implementations are free to ignore the hints completely, but should try to use an implementation algorithm that is as close as possible to the request. If an implementation supports a given algorithm when any value is used for an associated hint key, then minimally it must do so when the value for that key is the exact value that specifies the algorithm.
The keys used to control the hints are all special values that
subclass the associated RenderingHints.Key class.
Many common hints are expressed below as static constants in this
class, but the list is not meant to be exhaustive.
Other hints may be created by other packages by defining new objects
which subclass the Key class and defining the associated values.
| Nested Class Summary | |
|---|---|
static class |
RenderingHints.Key
Defines the base type of all keys used along with the RenderingHints class to control various
algorithm choices in the rendering and imaging pipelines. |
| Nested classes/interfaces inherited from interface java.util.Map |
|---|
Map.Entry<K,V> |
| Field Summary | |
|---|---|
static RenderingHints.Key |
KEY_ALPHA_INTERPOLATION
Alpha interpolation hint key. |
static RenderingHints.Key |
KEY_ANTIALIASING
Antialiasing hint key. |
static RenderingHints.Key |
KEY_COLOR_RENDERING
Color rendering hint key. |
static RenderingHints.Key |
KEY_DITHERING
Dithering hint key. |
static RenderingHints.Key |
KEY_FRACTIONALMETRICS
Font fractional metrics hint key. |
static RenderingHints.Key |
KEY_INTERPOLATION
Interpolation hint key. |
static RenderingHints.Key |
KEY_RENDERING
Rendering hint key. |
static RenderingHints.Key |
KEY_STROKE_CONTROL
Stroke normalization control hint key. |
static RenderingHints.Key |
KEY_TEXT_ANTIALIASING
Text antialiasing hint key. |
static RenderingHints.Key |
KEY_TEXT_LCD_CONTRAST
LCD text contrast rendering hint key. |
static Object |
VALUE_ALPHA_INTERPOLATION_DEFAULT
Alpha interpolation hint value -- alpha blending algorithms are chosen by the implementation for a good tradeoff of performance vs. |
static Object |
VALUE_ALPHA_INTERPOLATION_QUALITY
Alpha interpolation hint value -- alpha blending algorithms are chosen with a preference for precision and visual quality. |
static Object |
VALUE_ALPHA_INTERPOLATION_SPEED
Alpha interpolation hint value -- alpha blending algorithms are chosen with a preference for calculation speed. |
static Object |
VALUE_ANTIALIAS_DEFAULT
Antialiasing hint value -- rendering is done with a default antialiasing mode chosen by the implementation. |
static Object |
VALUE_ANTIALIAS_OFF
Antialiasing hint value -- rendering is done without antialiasing. |
static Object |
VALUE_ANTIALIAS_ON
Antialiasing hint value -- rendering is done with antialiasing. |
static Object |
VALUE_COLOR_RENDER_DEFAULT
Color rendering hint value -- perform color conversion calculations as chosen by the implementation to represent the best available tradeoff between performance and accuracy. |
static Object |
VALUE_COLOR_RENDER_QUALITY
Color rendering hint value -- perform the color conversion calculations with the highest accuracy and visual quality. |
static Object |
VALUE_COLOR_RENDER_SPEED
Color rendering hint value -- perform the fastest color conversion to the format of the output device. |
static Object |
VALUE_DITHER_DEFAULT
Dithering hint value -- use a default for dithering chosen by the implementation. |
static Object |
VALUE_DITHER_DISABLE
Dithering hint value -- do not dither when rendering geometry. |
static Object |
VALUE_DITHER_ENABLE
Dithering hint value -- dither when rendering geometry, if needed. |
static Object |
VALUE_FRACTIONALMETRICS_DEFAULT
Font fractional metrics hint value -- character glyphs are positioned with accuracy chosen by the implementation. |
static Object |
VALUE_FRACTIONALMETRICS_OFF
Font fractional metrics hint value -- character glyphs are positioned with advance widths rounded to pixel boundaries. |
static Object |
VALUE_FRACTIONALMETRICS_ON
Font fractional metrics hint value -- character glyphs are positioned with sub-pixel accuracy. |
static Object |
VALUE_INTERPOLATION_BICUBIC
Interpolation hint value -- the color samples of 9 nearby integer coordinate samples in the image are interpolated using a cubic function in both X and Y to produce
a color sample. |
static Object |
VALUE_INTERPOLATION_BILINEAR
Interpolation hint value -- the color samples of the 4 nearest neighboring integer coordinate samples in the image are interpolated linearly to produce a color sample. |
static Object |
VALUE_INTERPOLATION_NEAREST_NEIGHBOR
Interpolation hint value -- the color sample of the nearest neighboring integer coordinate sample in the image is used. |
static Object |
VALUE_RENDER_DEFAULT
Rendering hint value -- rendering algorithms are chosen by the implementation for a good tradeoff of performance vs. |
static Object |
VALUE_RENDER_QUALITY
Rendering hint value -- rendering algorithms are chosen with a preference for output quality. |
static Object |
VALUE_RENDER_SPEED
Rendering hint value -- rendering algorithms are chosen with a preference for output speed. |
static Object |
VALUE_STROKE_DEFAULT
Stroke normalization control hint value -- geometry may be modified or left pure depending on the tradeoffs in a given implementation. |
static Object |
VALUE_STROKE_NORMALIZE
Stroke normalization control hint value -- geometry should be normalized to improve uniformity or spacing of lines and overall aesthetics. |
static Object |
VALUE_STROKE_PURE
Stroke normalization control hint value -- geometry should be left unmodified and rendered with sub-pixel accuracy. |
static Object |
VALUE_TEXT_ANTIALIAS_DEFAULT
Text antialiasing hint value -- text rendering is done according to the KEY_ANTIALIASING hint or a default chosen by the
implementation. |
static Object |
VALUE_TEXT_ANTIALIAS_GASP
Text antialiasing hint value -- text rendering is requested to use information in the font resource which specifies for each point size whether to apply VALUE_TEXT_ANTIALIAS_ON or
VALUE_TEXT_ANTIALIAS_OFF. |
static Object |
VALUE_TEXT_ANTIALIAS_LCD_HBGR
Text antialiasing hint value -- request that text be displayed optimised for an LCD display with subpixels in order from display left to right of B,G,R such that the horizontal subpixel resolution is three times that of the full pixel horizontal resolution (HBGR). |
static Object |
VALUE_TEXT_ANTIALIAS_LCD_HRGB
Text antialiasing hint value -- request that text be displayed optimised for an LCD display with subpixels in order from display left to right of R,G,B such that the horizontal subpixel resolution is three times that of the full pixel horizontal resolution (HRGB). |
static Object |
VALUE_TEXT_ANTIALIAS_LCD_VBGR
Text antialiasing hint value -- request that text be displayed optimised for an LCD display with subpixel organisation from display top to bottom of B,G,R such that the vertical subpixel resolution is three times that of the full pixel vertical resolution (VBGR). |
static Object |
VALUE_TEXT_ANTIALIAS_LCD_VRGB
Text antialiasing hint value -- request that text be displayed optimised for an LCD display with subpixel organisation from display top to bottom of R,G,B such that the vertical subpixel resolution is three times that of the full pixel vertical resolution (VRGB). |
static Object |
VALUE_TEXT_ANTIALIAS_OFF
Text antialiasing hint value -- text rendering is done without any form of antialiasing. |
static Object |
VALUE_TEXT_ANTIALIAS_ON
Text antialiasing hint value -- text rendering is done with some form of antialiasing. |
| Constructor Summary | |
|---|---|
RenderingHints(Map<RenderingHints.Key,?> init)
Constructs a new object with keys and values initialized from the specified Map object which may be null. |
|
RenderingHints(RenderingHints.Key key,
Object value)
Constructs a new object with the specified key/value pair. |
|
| Method Summary | |
|---|---|
void |
add(RenderingHints hints)
Adds all of the keys and corresponding values from the specified RenderingHints object to this
RenderingHints object. |
void |
clear()
Clears this RenderingHints object of all key/value
pairs. |
Object |
clone()
Creates a clone of this RenderingHints object
that has the same contents as this RenderingHints
object. |
boolean |
containsKey(Object key)
Returns true if this RenderingHints
contains a mapping for the specified key. |
boolean |
containsValue(Object value)
Returns true if this RenderingHints maps one or more keys to the specified value. |
Set<Map.Entry<Object,Object>> |
entrySet()
Returns a Set view of the mappings contained
in this RenderingHints. |
boolean |
equals(Object o)
Compares the specified Object with this
RenderingHints for equality. |
Object |
get(Object key)
Returns the value to which the specified key is mapped. |
int |
hashCode()
Returns the hash code value for this RenderingHints. |
boolean |
isEmpty()
Returns true if this
RenderingHints contains no key-value mappings. |
Set<Object> |
keySet()
Returns a Set view of the Keys contained in this
RenderingHints. |
Object |
put(Object key,
Object value)
Maps the specified key to the specified
value in this RenderingHints object. |
void |
putAll(Map<?,?> m)
Copies all of the mappings from the specified Map
to this RenderingHints. |
Object |
remove(Object key)
Removes the key and its corresponding value from this RenderingHints object. |
int |
size()
Returns the number of key-value mappings in this RenderingHints. |
String |
toString()
Returns a rather long string representation of the hashmap which contains the mappings of keys to values for this RenderingHints object. |
Collection<Object> |
values()
Returns a Collection view of the values
contained in this RenderinHints. |
| Methods inherited from class java.lang.Object |
|---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final RenderingHints.Key KEY_ANTIALIASING
ANTIALIASING hint controls whether or not the
geometry rendering methods of a Graphics2D object
will attempt to reduce aliasing artifacts along the edges
of shapes.
A typical antialiasing algorithm works by blending the existing colors of the pixels along the boundary of a shape with the requested fill paint according to the estimated partial pixel coverage of the shape.
The allowable values for this hint are
public static final Object VALUE_ANTIALIAS_ON
KEY_ANTIALIASINGpublic static final Object VALUE_ANTIALIAS_OFF
KEY_ANTIALIASINGpublic static final Object VALUE_ANTIALIAS_DEFAULT
KEY_ANTIALIASINGpublic static final RenderingHints.Key KEY_RENDERING
RENDERING hint is a general hint that provides
a high level recommendation as to whether to bias algorithm
choices more for speed or quality when evaluating tradeoffs.
This hint could be consulted for any rendering or image
manipulation operation, but decisions will usually honor
other, more specific hints in preference to this hint.
The allowable values for this hint are
public static final Object VALUE_RENDER_SPEED
KEY_RENDERINGpublic static final Object VALUE_RENDER_QUALITY
KEY_RENDERINGpublic static final Object VALUE_RENDER_DEFAULT
KEY_RENDERINGpublic static final RenderingHints.Key KEY_DITHERING
DITHERING hint controls how closely to approximate
a color when storing into a destination with limited color
resolution.
Some rendering destinations may support a limited number of
color choices which may not be able to accurately represent
the full spectrum of colors that can result during rendering
operations.
For such a destination the DITHERING hint controls
whether rendering is done with a flat solid fill of a single
pixel value which is the closest supported color to what was
requested, or whether shapes will be filled with a pattern of
colors which combine to better approximate that color.
The allowable values for this hint are
public static final Object VALUE_DITHER_DISABLE
KEY_DITHERINGpublic static final Object VALUE_DITHER_ENABLE
KEY_DITHERINGpublic static final Object VALUE_DITHER_DEFAULT
KEY_DITHERINGpublic static final RenderingHints.Key KEY_TEXT_ANTIALIASING
TEXT_ANTIALIASING hint can control the use of
antialiasing algorithms for text independently of the
choice used for shape rendering.
Often an application may want to use antialiasing for text
only and not for other shapes.
Additionally, the algorithms for reducing the aliasing
artifacts for text are often more sophisticated than those
that have been developed for general rendering so this
hint key provides additional values which can control
the choices of some of those text-specific algorithms.
If left in the DEFAULT state, this hint will
generally defer to the value of the regular
KEY_ANTIALIASING hint key.
The allowable values for this hint are
VALUE_TEXT_ANTIALIAS_ON
VALUE_TEXT_ANTIALIAS_OFF
VALUE_TEXT_ANTIALIAS_DEFAULT
VALUE_TEXT_ANTIALIAS_GASP
VALUE_TEXT_ANTIALIAS_LCD_HRGB
VALUE_TEXT_ANTIALIAS_LCD_HBGR
VALUE_TEXT_ANTIALIAS_LCD_VRGB
VALUE_TEXT_ANTIALIAS_LCD_VBGR
public static final Object VALUE_TEXT_ANTIALIAS_ON
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_OFF
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_DEFAULT
KEY_ANTIALIASING hint or a default chosen by the
implementation.
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_GASP
VALUE_TEXT_ANTIALIAS_ON or
VALUE_TEXT_ANTIALIAS_OFF.
TrueType fonts typically provide this information in the 'gasp' table. In the absence of this information, the behaviour for a particular font and size is determined by implementation defaults.
Note:A font designer will typically carefully hint a font for
the most common user interface point sizes. Consequently the 'gasp'
table will likely specify to use only hinting at those sizes and not
"smoothing". So in many cases the resulting text display is
equivalent to VALUE_TEXT_ANTIALIAS_OFF.
This may be unexpected but is correct.
Logical fonts which are composed of multiple physical fonts will for consistency will use the setting most appropriate for the overall composite font.
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_LCD_HRGB
Notes:
An implementation when choosing whether to apply any of the
LCD text hint values may take into account factors including requiring
color depth of the destination to be at least 15 bits per pixel
(ie 5 bits per color component),
characteristics of a font such as whether embedded bitmaps may
produce better results, or when displaying to a non-local networked
display device enabling it only if suitable protocols are available,
or ignoring the hint if performing very high resolution rendering
or the target device is not appropriate: eg when printing.
These hints can equally be applied when rendering to software images,
but these images may not then be suitable for general export, as the
text will have been rendered appropriately for a specific subpixel
organisation. Also lossy images are not a good choice, nor image
formats such as GIF which have limited colors.
So unless the image is destined solely for rendering on a
display device with the same configuration, some other text
anti-aliasing hint such as
VALUE_TEXT_ANTIALIAS_ON
may be a better choice.
Selecting a value which does not match the LCD display in use will likely lead to a degradation in text quality. On display devices (ie CRTs) which do not have the same characteristics as LCD displays, the overall effect may appear similar to standard text anti-aliasing, but the quality may be degraded by color distortion. Analog connected LCD displays may also show little advantage over standard text-antialiasing and be similar to CRTs.
In other words for the best results use an LCD display with a digital display connector and specify the appropriate sub-pixel configuration.
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_LCD_HBGR
VALUE_TEXT_ANTIALIAS_LCD_HRGB,
for more information on when this hint is applied.
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_LCD_VRGB
VALUE_TEXT_ANTIALIAS_LCD_HRGB,
for more information on when this hint is applied.
KEY_TEXT_ANTIALIASINGpublic static final Object VALUE_TEXT_ANTIALIAS_LCD_VBGR
VALUE_TEXT_ANTIALIAS_LCD_HRGB,
for more information on when this hint is applied.
KEY_TEXT_ANTIALIASINGpublic static final RenderingHints.Key KEY_TEXT_LCD_CONTRAST
Integer object which is used as a text
contrast adjustment when used in conjunction with an LCD text
anti-aliasing hint such as
VALUE_TEXT_ANTIALIAS_LCD_HRGB.
KEY_TEXT_ANTIALIASINGpublic static final RenderingHints.Key KEY_FRACTIONALMETRICS
FRACTIONALMETRICS hint controls whether the positioning
of individual character glyphs takes into account the sub-pixel
accuracy of the scaled character advances of the font or whether
such advance vectors are rounded to an integer number of whole
device pixels.
This hint only recommends how much accuracy should be used to
position the glyphs and does not specify or recommend whether or
not the actual rasterization or pixel bounds of the glyph should
be modified to match.
Rendering text to a low resolution device like a screen will necessarily involve a number of rounding operations as the high quality and very precise definition of the shape and metrics of the character glyphs must be matched to discrete device pixels. Ideally the positioning of glyphs during text layout would be calculated by scaling the design metrics in the font according to the point size, but then the scaled advance width will not necessarily be an integer number of pixels. If the glyphs are positioned with sub-pixel accuracy according to these scaled design metrics then the rasterization would ideally need to be adjusted for each possible sub-pixel origin.
Unfortunately, scaling each glyph customized to its exact subpixel origin during text layout would be prohibitively expensive so a simplified system based on integer device positions is typically used to lay out the text. The rasterization of the glyph and the scaled advance width are both adjusted together to yield text that looks good at device resolution and has consistent integer pixel distances between glyphs that help the glyphs look uniformly and consistently spaced and readable.
This process of rounding advance widths for rasterized glyphs to integer distances means that the character density and the overall length of a string of text will be different from the theoretical design measurements due to the accumulation of a series of small differences in the adjusted widths of each glyph. The specific differences will be different for each glyph, some being wider and some being narrower than their theoretical design measurements. Thus the overall difference in character density and length will vary by a number of factors including the font, the specific device resolution being targeted, and the glyphs chosen to represent the string being rendered. As a result, rendering the same string at multiple device resolutions can yield widely varying metrics for whole strings.
When FRACTIONALMETRICS are enabled, the true font design
metrics are scaled by the point size and used for layout with
sub-pixel accuracy.
The average density of glyphs and total length of a long
string of characters will therefore more closely match the
theoretical design of the font, but readability may be affected
since individual pairs of characters may not always appear to
be consistent distances apart depending on how the sub-pixel
accumulation of the glyph origins meshes with the device pixel
grid.
Enabling this hint may be desirable when text layout is being
performed that must be consistent across a wide variety of
output resolutions.
Specifically, this hint may be desirable in situations where
the layout of text is being previewed on a low resolution
device like a screen for output that will eventually be
rendered on a high resolution printer or typesetting device.
When disabled, the scaled design metrics are rounded or adjusted to integer distances for layout. The distances between any specific pair of glyphs will be more uniform on the device, but the density and total length of long strings may no longer match the theoretical intentions of the font designer. Disabling this hint will typically produce more readable results on low resolution devices like computer monitors.
The allowable values for this key are
public static final Object VALUE_FRACTIONALMETRICS_OFF
KEY_FRACTIONALMETRICSpublic static final Object VALUE_FRACTIONALMETRICS_ON
KEY_FRACTIONALMETRICSpublic static final Object VALUE_FRACTIONALMETRICS_DEFAULT
KEY_FRACTIONALMETRICSpublic static final RenderingHints.Key KEY_INTERPOLATION
INTERPOLATION hint controls how image pixels are
filtered or resampled during an image rendering operation.
Implicitly images are defined to provide color samples at integer coordinate locations. When images are rendered upright with no scaling onto a destination, the choice of which image pixels map to which device pixels is obvious and the samples at the integer coordinate locations in the image are transfered to the pixels at the corresponding integer locations on the device pixel grid one for one. When images are rendered in a scaled, rotated, or otherwise transformed coordinate system, then the mapping of device pixel coordinates back to the image can raise the question of what color sample to use for the continuous coordinates that lie between the integer locations of the provided image samples. Interpolation algorithms define functions which provide a color sample for any continuous coordinate in an image based on the color samples at the surrounding integer coordinates.
The allowable values for this hint are
public static final Object VALUE_INTERPOLATION_NEAREST_NEIGHBOR
As the image is scaled up, it will look correspondingly blocky. As the image is scaled down, the colors for source pixels will be either used unmodified, or skipped entirely in the output representation.
KEY_INTERPOLATIONpublic static final Object VALUE_INTERPOLATION_BILINEAR
As the image is scaled up, there are no blocky edges between
the colors in the image as there are with
NEAREST_NEIGHBOR,
but the blending may show some subtle discontinuities along the
horizontal and vertical edges that line up with the samples
caused by a sudden change in the slope of the interpolation
from one side of a sample to the other.
As the image is scaled down, more image pixels have their
color samples represented in the resulting output since each
output pixel recieves color information from up to 4 image
pixels.
KEY_INTERPOLATIONpublic static final Object VALUE_INTERPOLATION_BICUBIC
X and Y to produce
a color sample.
Conceptually the view of the image is very similar to the view
used in the BILINEAR
algorithm except that the ramps of colors that connect between
the samples are curved and have better continuity of slope
as they cross over between sample boundaries.
As the image is scaled up, there are no blocky edges and the
interpolation should appear smoother and with better depictions
of any edges in the original image than with BILINEAR.
As the image is scaled down, even more of the original color
samples from the original image will have their color information
carried through and represented.
KEY_INTERPOLATIONpublic static final RenderingHints.Key KEY_ALPHA_INTERPOLATION
ALPHA_INTERPOLATION hint is a general hint that
provides a high level recommendation as to whether to bias
alpha blending algorithm choices more for speed or quality
when evaluating tradeoffs.
This hint could control the choice of alpha blending calculations that sacrifice some precision to use fast lookup tables or lower precision SIMD instructions. This hint could also control whether or not the color and alpha values are converted into a linear color space during the calculations for a more linear visual effect at the expense of additional per-pixel calculations.
The allowable values for this hint are
public static final Object VALUE_ALPHA_INTERPOLATION_SPEED
KEY_ALPHA_INTERPOLATIONpublic static final Object VALUE_ALPHA_INTERPOLATION_QUALITY
KEY_ALPHA_INTERPOLATIONpublic static final Object VALUE_ALPHA_INTERPOLATION_DEFAULT
KEY_ALPHA_INTERPOLATIONpublic static final RenderingHints.Key KEY_COLOR_RENDERING
COLOR_RENDERING hint controls the accuracy of
approximation and conversion when storing colors into a
destination image or surface.
When a rendering or image manipulation operation produces a color value that must be stored into a destination, it must first convert that color into a form suitable for storing into the destination image or surface. Minimally, the color components must be converted to bit representations and ordered in the correct order or an index into a color lookup table must be chosen before the data can be stored into the destination memory. Without this minimal conversion, the data in the destination would likely represent random, incorrect or possibly even unsupported values. Algorithms to quickly convert the results of rendering operations into the color format of most common destinations are well known and fairly optimal to execute.
Simply performing the most basic color format conversion to
store colors into a destination can potentially ignore a
difference in the calibration of the
ColorSpace
of the source and destination or other factors such as the
linearity of the gamma correction.
Unless the source and destination ColorSpace are
identical, to correctly perform a rendering operation with
the most care taken for the accuracy of the colors being
represented, the source colors should be converted to a
device independent ColorSpace and the results then
converted back to the destination ColorSpace.
Furthermore, if calculations such as the blending of multiple
source colors are to be performed during the rendering
operation, greater visual clarity can be achieved if the
intermediate device independent ColorSpace is
chosen to have a linear relationship between the values
being calculated and the perception of the human eye to
the response curves of the output device.
The allowable values for this hint are
public static final Object VALUE_COLOR_RENDER_SPEED
KEY_COLOR_RENDERINGpublic static final Object VALUE_COLOR_RENDER_QUALITY
KEY_COLOR_RENDERINGpublic static final Object VALUE_COLOR_RENDER_DEFAULT
KEY_COLOR_RENDERINGpublic static final RenderingHints.Key KEY_STROKE_CONTROL
STROKE_CONTROL hint controls whether a rendering
implementation should or is allowed to modify the geometry
of rendered shapes for various purposes.
Some implementations may be able to use an optimized platform rendering library which may be faster than traditional software rendering algorithms on a given platform, but which may also not support floating point coordinates. Some implementations may also have sophisticated algorithms which perturb the coordinates of a path so that wide lines appear more uniform in width and spacing.
If an implementation performs any type of modification or "normalization" of a path, it should never move the coordinates by more than half a pixel in any direction.
The allowable values for this hint are
public static final Object VALUE_STROKE_DEFAULT
KEY_STROKE_CONTROLpublic static final Object VALUE_STROKE_NORMALIZE
KEY_STROKE_CONTROLpublic static final Object VALUE_STROKE_PURE
KEY_STROKE_CONTROL| Constructor Detail |
|---|
public RenderingHints(Map<RenderingHints.Key,?> init)
init - a map of key/value pairs to initialize the hints
or null if the object should be empty
public RenderingHints(RenderingHints.Key key,
Object value)
key - the key of the particular hint propertyvalue - the value of the hint property specified with
key| Method Detail |
|---|
public int size()
RenderingHints.
size in interface Map<Object,Object>RenderingHints.public boolean isEmpty()
true if this
RenderingHints contains no key-value mappings.
isEmpty in interface Map<Object,Object>true if this
RenderingHints contains no key-value mappings.public boolean containsKey(Object key)
true if this RenderingHints
contains a mapping for the specified key.
containsKey in interface Map<Object,Object>key - key whose presence in this
RenderingHints is to be tested.
true if this RenderingHints
contains a mapping for the specified key.
ClassCastExceptionRenderingHints.Keypublic boolean containsValue(Object value)
true if and only
if this RenderingHints
contains at least one mapping to a value v such that
(value==null ? v==null : value.equals(v)). This operation will probably require time linear in the
RenderingHints size for most implementations
of RenderingHints.
containsValue in interface Map<Object,Object>value - value whose presence in this
RenderingHints is to be tested.
true if this RenderingHints
maps one or more keys to the specified value.public Object get(Object key)
get in interface Map<Object,Object>key - a rendering hint key
null if the key is not mapped to any value in
this object.
ClassCastExceptionRenderingHints.Keyput(Object, Object)
public Object put(Object key,
Object value)
key to the specified
value in this RenderingHints object.
Neither the key nor the value can be null.
The value can be retrieved by calling the get method
with a key that is equal to the original key.
put in interface Map<Object,Object>key - the rendering hint key.value - the rendering hint value.
null if it did not have one.
NullPointerExceptionnull.
ClassCastExceptionRenderingHints.Key
IllegalArgumentExceptionKey.isCompatibleValue()
method of the specified key returns false for the
specified valueget(Object)public void add(RenderingHints hints)
RenderingHints object to this
RenderingHints object. Keys that are present in
this RenderingHints object, but not in the specified
RenderingHints object are not affected.
hints - the set of key/value pairs to be added to this
RenderingHints objectpublic void clear()
RenderingHints object of all key/value
pairs.
clear in interface Map<Object,Object>public Object remove(Object key)
RenderingHints object. This method does nothing if the
key is not in this RenderingHints object.
remove in interface Map<Object,Object>key - the rendering hints key that needs to be removed
RenderingHints object, or null
if the key did not have a mapping.
ClassCastExceptionRenderingHints.Keypublic void putAll(Map<?,?> m)
Map
to this RenderingHints. These mappings replace
any mappings that this RenderingHints had for any
of the keys currently in the specified Map.
putAll in interface Map<Object,Object>m - the specified Map
ClassCastExceptionMap prevents it from being
stored in this RenderingHints.
IllegalArgumentExceptionMap
prevents it from being stored in
this RenderingHints.public Set<Object> keySet()
Set view of the Keys contained in this
RenderingHints. The Set is backed by the
RenderingHints, so changes to the
RenderingHints are reflected in the Set,
and vice-versa. If the RenderingHints is modified
while an iteration over the Set is in progress,
the results of the iteration are undefined. The Set
supports element removal, which removes the corresponding
mapping from the RenderingHints, via the
Iterator.remove, Set.remove,
removeAll retainAll, and
clear operations. It does not support
the add or addAll operations.
keySet in interface Map<Object,Object>Set view of the keys contained
in this RenderingHints.public Collection<Object> values()
Collection view of the values
contained in this RenderinHints.
The Collection is backed by the
RenderingHints, so changes to
the RenderingHints are reflected in
the Collection, and vice-versa.
If the RenderingHints is modified while
an iteration over the Collection is
in progress, the results of the iteration are undefined.
The Collection supports element removal,
which removes the corresponding mapping from the
RenderingHints, via the
Iterator.remove,
Collection.remove, removeAll,
retainAll and clear operations.
It does not support the add or
addAll operations.
values in interface Map<Object,Object>Collection view of the values
contained in this RenderingHints.public Set<Map.Entry<Object,Object>> entrySet()
Set view of the mappings contained
in this RenderingHints. Each element in the
returned Set is a Map.Entry.
The Set is backed by the RenderingHints,
so changes to the RenderingHints are reflected
in the Set, and vice-versa. If the
RenderingHints is modified while
while an iteration over the Set is in progress,
the results of the iteration are undefined.
The entrySet returned from a RenderingHints object
is not modifiable.
entrySet in interface Map<Object,Object>Set view of the mappings contained in
this RenderingHints.public boolean equals(Object o)
Object with this
RenderingHints for equality.
Returns true if the specified object is also a
Map and the two Map objects represent
the same mappings. More formally, two Map objects
t1 and t2 represent the same mappings
if t1.keySet().equals(t2.keySet()) and for every
key k in t1.keySet(),
(t1.get(k)==null ? t2.get(k)==null : t1.get(k).equals(t2.get(k))). This ensures that the
equals method works properly across
different implementations of the Map interface.
equals in interface Map<Object,Object>equals in class Objecto - Object to be compared for equality with
this RenderingHints.
true if the specified Object
is equal to this RenderingHints.Object.hashCode(),
Hashtablepublic int hashCode()
RenderingHints.
The hash code of a RenderingHints is defined to be
the sum of the hashCodes of each Entry in the
RenderingHints object's entrySet view. This ensures that
t1.equals(t2) implies that
t1.hashCode()==t2.hashCode() for any two Map
objects t1 and t2, as required by the general
contract of Object.hashCode.
hashCode in interface Map<Object,Object>hashCode in class ObjectRenderingHints.Map.Entry.hashCode(),
Object.hashCode(),
Object.equals(Object),
equals(Object)public Object clone()
RenderingHints object
that has the same contents as this RenderingHints
object.
clone in class ObjectCloneablepublic String toString()
RenderingHints object.
toString in class Object
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