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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.awt.BasicStroke
public class BasicStroke
The BasicStroke
class defines a basic set of rendering
attributes for the outlines of graphics primitives, which are rendered
with a Graphics2D
object that has its Stroke attribute set to
this BasicStroke
.
The rendering attributes defined by BasicStroke
describe
the shape of the mark made by a pen drawn along the outline of a
Shape
and the decorations applied at the ends and joins of
path segments of the Shape
.
These rendering attributes include:
SEG_CLOSE
for more information on the CLOSE segment.
The three different decorations are: CAP_BUTT
,
CAP_ROUND
, and CAP_SQUARE
.
SEG_CLOSE
.
The three different decorations are: JOIN_BEVEL
,
JOIN_MITER
, and JOIN_ROUND
.
Shape
argument. When a Graphics2D
object uses a
Stroke
object to redefine a path during the execution
of one of its draw
methods, the geometry is supplied
in its original form before the Graphics2D
transform
attribute is applied. Therefore, attributes such as the pen width
are interpreted in the user space coordinate system of the
Graphics2D
object and are subject to the scaling and
shearing effects of the user-space-to-device-space transform in that
particular Graphics2D
.
For example, the width of a rendered shape's outline is determined
not only by the width attribute of this BasicStroke
,
but also by the transform attribute of the
Graphics2D
object. Consider this code:
// sets the Graphics2D object's Tranform attribute g2d.scale(10, 10); // sets the Graphics2D object's Stroke attribute g2d.setStroke(new BasicStroke(1.5f));Assuming there are no other scaling transforms added to the
Graphics2D
object, the resulting line
will be approximately 15 pixels wide.
As the example code demonstrates, a floating-point line
offers better precision, especially when large transforms are
used with a Graphics2D
object.
When a line is diagonal, the exact width depends on how the
rendering pipeline chooses which pixels to fill as it traces the
theoretical widened outline. The choice of which pixels to turn
on is affected by the antialiasing attribute because the
antialiasing rendering pipeline can choose to color
partially-covered pixels.
For more information on the user space coordinate system and the
rendering process, see the Graphics2D
class comments.
Graphics2D
Field Summary | |
---|---|
static int |
CAP_BUTT
Ends unclosed subpaths and dash segments with no added decoration. |
static int |
CAP_ROUND
Ends unclosed subpaths and dash segments with a round decoration that has a radius equal to half of the width of the pen. |
static int |
CAP_SQUARE
Ends unclosed subpaths and dash segments with a square projection that extends beyond the end of the segment to a distance equal to half of the line width. |
static int |
JOIN_BEVEL
Joins path segments by connecting the outer corners of their wide outlines with a straight segment. |
static int |
JOIN_MITER
Joins path segments by extending their outside edges until they meet. |
static int |
JOIN_ROUND
Joins path segments by rounding off the corner at a radius of half the line width. |
Constructor Summary | |
---|---|
BasicStroke()
Constructs a new BasicStroke with defaults for all
attributes. |
|
BasicStroke(float width)
Constructs a solid BasicStroke with the specified
line width and with default values for the cap and join
styles. |
|
BasicStroke(float width,
int cap,
int join)
Constructs a solid BasicStroke with the specified
attributes. |
|
BasicStroke(float width,
int cap,
int join,
float miterlimit)
Constructs a solid BasicStroke with the specified
attributes. |
|
BasicStroke(float width,
int cap,
int join,
float miterlimit,
float[] dash,
float dash_phase)
Constructs a new BasicStroke with the specified
attributes. |
Method Summary | |
---|---|
Shape |
createStrokedShape(Shape s)
Returns a Shape whose interior defines the
stroked outline of a specified Shape . |
boolean |
equals(Object obj)
Tests if a specified object is equal to this BasicStroke
by first testing if it is a BasicStroke and then comparing
its width, join, cap, miter limit, dash, and dash phase attributes with
those of this BasicStroke . |
float[] |
getDashArray()
Returns the array representing the lengths of the dash segments. |
float |
getDashPhase()
Returns the current dash phase. |
int |
getEndCap()
Returns the end cap style. |
int |
getLineJoin()
Returns the line join style. |
float |
getLineWidth()
Returns the line width. |
float |
getMiterLimit()
Returns the limit of miter joins. |
int |
hashCode()
Returns the hashcode for this stroke. |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final int JOIN_MITER
public static final int JOIN_ROUND
public static final int JOIN_BEVEL
public static final int CAP_BUTT
public static final int CAP_ROUND
public static final int CAP_SQUARE
Constructor Detail |
---|
public BasicStroke(float width, int cap, int join, float miterlimit, float[] dash, float dash_phase)
BasicStroke
with the specified
attributes.
width
- the width of this BasicStroke
. The
width must be greater than or equal to 0.0f. If width is
set to 0.0f, the stroke is rendered as the thinnest
possible line for the target device and the antialias
hint setting.cap
- the decoration of the ends of a BasicStroke
join
- the decoration applied where path segments meetmiterlimit
- the limit to trim the miter join. The miterlimit
must be greater than or equal to 1.0f.dash
- the array representing the dashing patterndash_phase
- the offset to start the dashing pattern
IllegalArgumentException
- if width
is negative
IllegalArgumentException
- if cap
is not either
CAP_BUTT, CAP_ROUND or CAP_SQUARE
IllegalArgumentException
- if miterlimit
is less
than 1 and join
is JOIN_MITER
IllegalArgumentException
- if join
is not
either JOIN_ROUND, JOIN_BEVEL, or JOIN_MITER
IllegalArgumentException
- if dash_phase
is negative and dash
is not null
IllegalArgumentException
- if the length of
dash
is zero
IllegalArgumentException
- if dash lengths are all zero.public BasicStroke(float width, int cap, int join, float miterlimit)
BasicStroke
with the specified
attributes.
width
- the width of the BasicStroke
cap
- the decoration of the ends of a BasicStroke
join
- the decoration applied where path segments meetmiterlimit
- the limit to trim the miter join
IllegalArgumentException
- if width
is negative
IllegalArgumentException
- if cap
is not either
CAP_BUTT, CAP_ROUND or CAP_SQUARE
IllegalArgumentException
- if miterlimit
is less
than 1 and join
is JOIN_MITER
IllegalArgumentException
- if join
is not
either JOIN_ROUND, JOIN_BEVEL, or JOIN_MITERpublic BasicStroke(float width, int cap, int join)
BasicStroke
with the specified
attributes. The miterlimit
parameter is
unnecessary in cases where the default is allowable or the
line joins are not specified as JOIN_MITER.
width
- the width of the BasicStroke
cap
- the decoration of the ends of a BasicStroke
join
- the decoration applied where path segments meet
IllegalArgumentException
- if width
is negative
IllegalArgumentException
- if cap
is not either
CAP_BUTT, CAP_ROUND or CAP_SQUARE
IllegalArgumentException
- if join
is not
either JOIN_ROUND, JOIN_BEVEL, or JOIN_MITERpublic BasicStroke(float width)
BasicStroke
with the specified
line width and with default values for the cap and join
styles.
width
- the width of the BasicStroke
IllegalArgumentException
- if width
is negativepublic BasicStroke()
BasicStroke
with defaults for all
attributes.
The default attributes are a solid line of width 1.0, CAP_SQUARE,
JOIN_MITER, a miter limit of 10.0.
Method Detail |
---|
public Shape createStrokedShape(Shape s)
Shape
whose interior defines the
stroked outline of a specified Shape
.
createStrokedShape
in interface Stroke
s
- the Shape
boundary be stroked
Shape
of the stroked outline.public float getLineWidth()
Graphics2D
class comments for more information on
the user space coordinate system.
BasicStroke
.Graphics2D
public int getEndCap()
BasicStroke
as one
of the static int
values that define possible end cap
styles.public int getLineJoin()
BasicStroke
as one
of the static int
values that define possible line
join styles.public float getMiterLimit()
BasicStroke
.public float[] getDashArray()
Shape
to be stroked, the user space
distance that the pen travels is accumulated. The distance
value is used to index into the dash array.
The pen is opaque when its current cumulative distance maps
to an even element of the dash array and transparent otherwise.
public float getDashPhase()
float
value.public int hashCode()
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
public boolean equals(Object obj)
BasicStroke
by first testing if it is a BasicStroke
and then comparing
its width, join, cap, miter limit, dash, and dash phase attributes with
those of this BasicStroke
.
equals
in class Object
obj
- the specified object to compare to this
BasicStroke
true
if the width, join, cap, miter limit, dash, and
dash phase are the same for both objects;
false
otherwise.Object.hashCode()
,
Hashtable
|
Java™ Platform Standard Ed. 6 |
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