javafx.scene.paint

Class RadialGradient

java.lang.Object

javafx.scene.paint.Paint
- javafx.scene.paint.RadialGradient

public final class RadialGradient
extends Paint

The RadialGradient class provides a way to fill a shape with a circular radial color gradient pattern. The user may specify 2 or more gradient colors, and this paint will provide an interpolation between each color. The user must specify the circle controlling the gradient pattern, which is defined by a center point and a radius. The user can also specify a separate focus point within that circle, which controls the location of the first color of the gradient. By default the focus is set to be the center of the circle. The center and radius are specified relative to a unit square, unless the proportional variable is false. By default proportional is true, and the gradient will be scaled to fill whatever shape it is applied to. The focus point is always specified relative to the center point by an angle and a distance relative to the radius. This paint will map the first color of the gradient to the focus point, and the last color to the perimeter of the circle, interpolating smoothly for any in-between colors specified by the user. Any line drawn from the focus point to the circumference will thus span all of the gradient colors. The focus distance will be clamped to the range (-1, 1) so that the focus point is always strictly inside the circle. The application provides an array of Stops specifying how to distribute the colors along the gradient. The Stop#offset variable must be the range 0.0 to 1.0 and act like keyframes along the gradient. They mark where the gradient should be exactly a particular color.

Since:

JavaFX 2.0

Constructor Summary

Constructors
Constructor and Description
`RadialGradient(double focusAngle, double focusDistance, double centerX, double centerY, double radius, boolean proportional, CycleMethod cycleMethod, List<Stop> stops)` Creates a new instance of RadialGradient.
`RadialGradient(double focusAngle, double focusDistance, double centerX, double centerY, double radius, boolean proportional, CycleMethod cycleMethod, Stop... stops)` Creates a new instance of RadialGradient.

Method Summary

All MethodsStatic MethodsInstance MethodsConcrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`double`	`getCenterX()` Defines the X coordinate of the center point of the circle defining the gradient.
`double`	`getCenterY()` Defines the X coordinate of the center point of the circle defining the gradient.
`CycleMethod`	`getCycleMethod()` Defines which of the follwing cycle method is applied to the `LinearGradient`: `CycleMethod.NO_CYCLE`, `CycleMethod.REFLECT`, or `CycleMethod.REPEAT`.
`double`	`getFocusAngle()` Defines the angle in degrees from the center of the gradient to the focus point to which the first color is mapped.
`double`	`getFocusDistance()` Defines the distance from the center of the gradient to the focus point to which the first color is mapped.
`double`	`getRadius()` Specifies the radius of the circle defining the extents of the color gradient.
`List<Stop>`	`getStops()` A sequence of 2 or more `Stop` values specifying how to distribute the colors along the gradient.
`int`	`hashCode()` Returns a hash code for this `RadialGradient` object.
`boolean`	`isOpaque()` Gets whether this Paint is completely opaque.
`boolean`	`isProportional()` Indicates whether the center and radius values are proportional or absolute.
`String`	`toString()` Returns a string representation of this `RadialGradient` object.
`static RadialGradient`	`valueOf(String value)` Creates a radial gradient value from a string representation.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RadialGradient

public RadialGradient(double focusAngle,
                      double focusDistance,
                      double centerX,
                      double centerY,
                      double radius,
                      boolean proportional,
                      CycleMethod cycleMethod,
                      Stop... stops)

Creates a new instance of RadialGradient.

Parameters:

focusAngle - the angle in degrees from the center of the gradient to the focus point to which the first color is mapped

RadialGradient

public RadialGradient(double focusAngle,
                      double focusDistance,
                      double centerX,
                      double centerY,
                      double radius,
                      boolean proportional,
                      CycleMethod cycleMethod,
                      List<Stop> stops)

Creates a new instance of RadialGradient.

Parameters:

focusAngle - the angle in degrees from the center of the gradient to the focus point to which the first color is mapped

Method Detail
- getFocusAngle
```
public final double getFocusAngle()
```
  Defines the angle in degrees from the center of the gradient to the focus point to which the first color is mapped.
- getFocusDistance
```
public final double getFocusDistance()
```
  Defines the distance from the center of the gradient to the focus point to which the first color is mapped. A distance of 0.0 will be at the center of the gradient circle. A distance of 1.0 will be on the circumference of the gradient circle.
- getCenterX
```
public final double getCenterX()
```
  Defines the X coordinate of the center point of the circle defining the gradient. If proportional is true (the default), this value specifies a point on a unit square that will be scaled to match the size of the the shape that the gradient fills. The last color of the gradient is mapped to the perimeter of this circle.
  
  Default value:
  
  0.0
- getCenterY
```
public final double getCenterY()
```
  Defines the X coordinate of the center point of the circle defining the gradient. If proportional is true (the default), this value specifies a point on a unit square that will be scaled to match the size of the the shape that the gradient fills. The last color of the gradient is mapped to the perimeter of this circle.
  
  Default value:
  
  0.0
- getRadius
```
public final double getRadius()
```
  Specifies the radius of the circle defining the extents of the color gradient. If proportional is true (the default), this value specifies a size relative to unit square that will be scaled to match the size of the the shape that the gradient fills.
  
  Default value:
  
  1.0
- isProportional
```
public final boolean isProportional()
```
  Indicates whether the center and radius values are proportional or absolute. If this flag is true, the center point and radius are defined in a coordinate space where coordinates in the range [0..1] are scaled to map onto the bounds of the shape that the gradient fills. If this flag is false, then the center coordinates and the radius are specified in the local coordinate system of the node.
  
  Default value:
  
  true
- getCycleMethod
```
public final CycleMethod getCycleMethod()
```
  Defines which of the follwing cycle method is applied to the LinearGradient: CycleMethod.NO_CYCLE, CycleMethod.REFLECT, or CycleMethod.REPEAT.
  
  Default value:
  
  NO_CYCLE
- getStops
```
public final List<Stop> getStops()
```
  A sequence of 2 or more Stop values specifying how to distribute the colors along the gradient. These values must be in the range 0.0 to 1.0. They act like keyframes along the gradient: they mark where the gradient should be exactly a particular color.
  Each stop in the sequence must have an offset that is greater than the previous stop in the sequence.
  
  The list is unmodifiable and will throw UnsupportedOperationException on each modification attempt.
  
  Default value:
  
  empty
- isOpaque
```
public final boolean isOpaque()
```
  Description copied from class: Paint
  
  Gets whether this Paint is completely opaque. An opaque paint is one that has no alpha component in any of its colors. It may be possible for a Paint to be opaque and yet return false, if it cannot be easily determined whether the paint is actually opaque. For example, the ImagePattern may not be able to cheaply determine its opacity.
  
  Specified by:
  
  isOpaque in class Paint
  
  Returns:
  
  true if the Paint is opaque, false if it is not opaque or if it cannot be determined.
  
  Since:
  
  JavaFX 8.0
- equals
```
public boolean equals(Object obj)
```
  Indicates whether some other object is "equal to" this one.
  
  Overrides:
  
  equals in class Object
  
  Parameters:
  
  obj - the reference object with which to compare.
  
  Returns:
  
  true if this object is equal to the obj argument; false otherwise.
- hashCode
```
public int hashCode()
```
  Returns a hash code for this RadialGradient object.
  
  Overrides:
  
  hashCode in class Object
  
  Returns:
  
  a hash code for this RadialGradient object.
- toString
```
public String toString()
```
  Returns a string representation of this RadialGradient object.
  
  Overrides:
  
  toString in class Object
  
  Returns:
  
  a string representation of this RadialGradient object.
- valueOf
```
public static RadialGradient valueOf(String value)
```
  Creates a radial gradient value from a string representation.
  The format of the string representation is based on JavaFX CSS specification for radial gradient which is
```
radial-gradient([focus-angle <angle>, ]? 
                 [focus-distance <percentage>, ]? 
                 [center <point>, ]? 
                 radius [<length> | <percentage>], 
                 [[repeat | reflect],]? 
                 <color-stop>[, <color-stop>]+)
```
  where
```
<point> = [ [ <length> <length> ] | [ <percentage> | <percentage> ] ]
 <color-stop> = [ <color> [ <percentage> | <length>]? ]
```
  Currently length can be only specified in px, the specification of unit can be omited. Format of color representation is the one used in Color.web(String color). The radial-gradient keyword can be omited. For additional information about the format of string representation, see the CSS Reference Guide.
  Examples:
```
RadialGradient g
      = RadialGradient.valueOf("radial-gradient(center 100px 100px, radius 200px, red  0%, blue 30%, black 100%)");
 RadialGradient g
      = RadialGradient.valueOf("center 100px 100px, radius 200px, red  0%, blue 30%, black 100%");
 RadialGradient g
      = RadialGradient.valueOf("radial-gradient(center 50% 50%, radius 50%,  cyan, violet 75%, magenta)");
 RadialGradient g
      = RadialGradient.valueOf("center 50% 50%, radius 50%,  cyan, violet 75%, magenta");
```
  Parameters:
  
  value - the string to convert
  
  Returns:
  
  a RadialGradient object holding the value represented by the string argument.
  
  Throws:
  
  NullPointerException - if the value is null
  
  Since:
  
  JavaFX 2.1

© 2008, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from JavaFX API Documentation.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Java, JavaFX and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Class RadialGradient

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

RadialGradient

RadialGradient

Method Detail

getFocusAngle

getFocusDistance

getCenterX

getCenterY

getRadius

isProportional

getCycleMethod

getStops

isOpaque

equals

hashCode

toString

valueOf