java.lang.Object
java.awt.GradientPaint
- All Implemented Interfaces:
Paint
,Transparency
The
GradientPaint
class provides a way to fill
a Shape
with a linear color gradient pattern.
If Point
P1 with Color
C1 and Point
P2 with
Color
C2 are specified in user space, the
Color
on the P1, P2 connecting line is proportionally
changed from C1 to C2. Any point P not on the extended P1, P2
connecting line has the color of the point P' that is the perpendicular
projection of P on the extended P1, P2 connecting line.
Points on the extended line outside of the P1, P2 segment can be colored
in one of two ways.
- If the gradient is cyclic then the points on the extended P1, P2 connecting line cycle back and forth between the colors C1 and C2.
-
If the gradient is acyclic then points on the P1 side of the segment
have the constant
Color
C1 while points on the P2 side have the constantColor
C2.
- See Also:
-
Field Summary
Fields declared in interface java.awt.Transparency
BITMASK, OPAQUE, TRANSLUCENT
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Constructor Summary
ConstructorDescriptionGradientPaint
(float x1, float y1, Color color1, float x2, float y2, Color color2) Constructs a simple acyclicGradientPaint
object.GradientPaint
(float x1, float y1, Color color1, float x2, float y2, Color color2, boolean cyclic) Constructs either a cyclic or acyclicGradientPaint
object depending on theboolean
parameter.GradientPaint
(Point2D pt1, Color color1, Point2D pt2, Color color2) Constructs a simple acyclicGradientPaint
object.GradientPaint
(Point2D pt1, Color color1, Point2D pt2, Color color2, boolean cyclic) Constructs either a cyclic or acyclicGradientPaint
object depending on theboolean
parameter. -
Method Summary
Modifier and TypeMethodDescriptioncreateContext
(ColorModel cm, Rectangle deviceBounds, Rectangle2D userBounds, AffineTransform xform, RenderingHints hints) Creates and returns aPaintContext
used to generate a linear color gradient pattern.Returns the color C1 anchored by the point P1.Returns the color C2 anchored by the point P2.Returns a copy of the point P1 that anchors the first color.Returns a copy of the point P2 which anchors the second color.int
Returns the transparency mode for thisGradientPaint
.boolean
isCyclic()
Returnstrue
if the gradient cycles repeatedly between the two colors C1 and C2.
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Constructor Details
-
GradientPaint
Constructs a simple acyclicGradientPaint
object.- Parameters:
x1
- x coordinate of the first specifiedPoint
in user spacey1
- y coordinate of the first specifiedPoint
in user spacecolor1
-Color
at the first specifiedPoint
x2
- x coordinate of the second specifiedPoint
in user spacey2
- y coordinate of the second specifiedPoint
in user spacecolor2
-Color
at the second specifiedPoint
- Throws:
NullPointerException
- if either one of colors is null
-
GradientPaint
Constructs a simple acyclicGradientPaint
object.- Parameters:
pt1
- the first specifiedPoint
in user spacecolor1
-Color
at the first specifiedPoint
pt2
- the second specifiedPoint
in user spacecolor2
-Color
at the second specifiedPoint
- Throws:
NullPointerException
- if either one of colors or points is null
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GradientPaint
public GradientPaint(float x1, float y1, Color color1, float x2, float y2, Color color2, boolean cyclic) Constructs either a cyclic or acyclicGradientPaint
object depending on theboolean
parameter.- Parameters:
x1
- x coordinate of the first specifiedPoint
in user spacey1
- y coordinate of the first specifiedPoint
in user spacecolor1
-Color
at the first specifiedPoint
x2
- x coordinate of the second specifiedPoint
in user spacey2
- y coordinate of the second specifiedPoint
in user spacecolor2
-Color
at the second specifiedPoint
cyclic
-true
if the gradient pattern should cycle repeatedly between the two colors;false
otherwise
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GradientPaint
@ConstructorProperties({"point1","color1","point2","color2","cyclic"}) public GradientPaint(Point2D pt1, Color color1, Point2D pt2, Color color2, boolean cyclic) Constructs either a cyclic or acyclicGradientPaint
object depending on theboolean
parameter.- Parameters:
pt1
- the first specifiedPoint
in user spacecolor1
-Color
at the first specifiedPoint
pt2
- the second specifiedPoint
in user spacecolor2
-Color
at the second specifiedPoint
cyclic
-true
if the gradient pattern should cycle repeatedly between the two colors;false
otherwise- Throws:
NullPointerException
- if either one of colors or points is null
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Method Details
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getPoint1
Returns a copy of the point P1 that anchors the first color.- Returns:
- a
Point2D
object that is a copy of the point that anchors the first color of thisGradientPaint
.
-
getColor1
Returns the color C1 anchored by the point P1.- Returns:
- a
Color
object that is the color anchored by P1.
-
getPoint2
Returns a copy of the point P2 which anchors the second color.- Returns:
- a
Point2D
object that is a copy of the point that anchors the second color of thisGradientPaint
.
-
getColor2
Returns the color C2 anchored by the point P2.- Returns:
- a
Color
object that is the color anchored by P2.
-
isCyclic
public boolean isCyclic()Returnstrue
if the gradient cycles repeatedly between the two colors C1 and C2.- Returns:
true
if the gradient cycles repeatedly between the two colors;false
otherwise.
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createContext
public PaintContext createContext(ColorModel cm, Rectangle deviceBounds, Rectangle2D userBounds, AffineTransform xform, RenderingHints hints) Creates and returns aPaintContext
used to generate a linear color gradient pattern. See thespecification
of the method in thePaint
interface for information on null parameter handling.- Specified by:
createContext
in interfacePaint
- Parameters:
cm
- the preferredColorModel
which represents the most convenient format for the caller to receive the pixel data, ornull
if there is no preference.deviceBounds
- the device space bounding box of the graphics primitive being rendered.userBounds
- the user space bounding box of the graphics primitive being rendered.xform
- theAffineTransform
from user space into device space.hints
- the set of hints that the context object can use to choose between rendering alternatives.- Returns:
- the
PaintContext
for generating color patterns. - See Also:
-
getTransparency
public int getTransparency()Returns the transparency mode for thisGradientPaint
.- Specified by:
getTransparency
in interfaceTransparency
- Returns:
- an integer value representing this
GradientPaint
object's transparency mode. - See Also:
-