OpenJDK 27 · java.awt.RadialGradientPaint · APIdia, the JavaDoc alternative

The RadialGradientPaint 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 described 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.

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 the gradient colors.

Specifying a focus point outside of the radius of the circle will cause the rings of the gradient pattern to be centered on the point just inside the edge of the circle in the direction of the focus point. The rendering will internally use this modified location as if it were the specified focus point.

The user must provide an array of floats specifying how to distribute the colors along the gradient. These values should range from 0.0 to 1.0 and act like keyframes along the gradient (they mark where the gradient should be exactly a particular color).

In the event that the user does not set the first keyframe value equal to 0 and/or the last keyframe value equal to 1, keyframes will be created at these positions and the first and last colors will be replicated there. So, if a user specifies the following arrays to construct a gradient:

    {Color.BLUE, Color.RED}, {.3f, .7f}

this will be converted to a gradient with the following keyframes:

    {Color.BLUE, Color.BLUE, Color.RED, Color.RED}, {0f, .3f, .7f, 1f}

The user may also select what action the RadialGradientPaint object takes when it is filling the space outside the circle's radius by setting CycleMethod to either REFLECTION or REPEAT. The gradient color proportions are equal for any particular line drawn from the focus point. The following figure shows that the distance AB is equal to the distance BC, and the distance AD is equal to the distance DE.

image showing the
distance AB=BC, and AD=DE

If the gradient and graphics rendering transforms are uniformly scaled and the user sets the focus so that it coincides with the center of the circle, the gradient color proportions are equal for any line drawn from the center. The following figure shows the distances AB, BC, AD, and DE. They are all equal.

image showing the
distance of AB, BC, AD, and DE are all equal

Note that some minor variations in distances may occur due to sampling at the granularity of a pixel. If no cycle method is specified, NO_CYCLE will be chosen by default, which means the last keyframe color will be used to fill the remaining area.

The colorSpace parameter allows the user to specify in which colorspace the interpolation should be performed, default sRGB or linearized RGB.

The following code demonstrates typical usage of RadialGradientPaint, where the center and focus points are the same:

    Point2D center = new Point2D.Float(50, 50);
    float radius = 25;
    float[] dist = {0.0f, 0.2f, 1.0f};
    Color[] colors = {Color.RED, Color.WHITE, Color.BLUE};
    RadialGradientPaint p =
        new RadialGradientPaint(center, radius, dist, colors);

This image demonstrates the example code above, with default (centered) focus for each of the three cycle methods:

image showing the
output of the sameple code

It is also possible to specify a non-centered focus point, as in the following code:

    Point2D center = new Point2D.Float(50, 50);
    float radius = 25;
    Point2D focus = new Point2D.Float(40, 40);
    float[] dist = {0.0f, 0.2f, 1.0f};
    Color[] colors = {Color.RED, Color.WHITE, Color.BLUE};
    RadialGradientPaint p =
        new RadialGradientPaint(center, radius, focus,
                                dist, colors,
                                CycleMethod.NO_CYCLE);

This image demonstrates the previous example code, with non-centered focus for each of the three cycle methods:

image showing the
output of the sample code

Modifier and Type	Field and Description
private final Point2D	center Center of the circle defining the 100% gradient stop X coordinate.
private final Point2D	focus Focus point which defines the 0% gradient stop X coordinate.
private final float	radius Radius of the outermost circle defining the 100% gradient stop.

Constructor Summary

Access	Constructor and Description
public	RadialGradientPaint(float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cx, float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy, float the radius of the circle defining the extents of the color gradient radius, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors) Constructs a `RadialGradientPaint` with a default `NO_CYCLE` repeating method and `SRGB` color space, using the center as the focus point.
public	RadialGradientPaint(Point2D the center point, in user space, of the circle defining the gradient center, float the radius of the circle defining the extents of the color gradient radius, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors) Constructs a `RadialGradientPaint` with a default `NO_CYCLE` repeating method and `SRGB` color space, using the center as the focus point.
public	RadialGradientPaint(float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cx, float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy, float the radius of the circle defining the extents of the color gradient radius, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space, using the center as the focus point.
public	RadialGradientPaint(Point2D the center point, in user space, of the circle defining the gradient center, float the radius of the circle defining the extents of the color gradient radius, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space, using the center as the focus point.
public	RadialGradientPaint(float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cx, float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy, float the radius of the circle defining the extents of the color gradient radius, float the X coordinate of the point in user space to which the first color is mapped fx, float the Y coordinate of the point in user space to which the first color is mapped fy, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space.
public	RadialGradientPaint(Point2D the center point, in user space, of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. center, float the radius of the circle defining the extents of the color gradient radius, Point2D the point in user space to which the first color is mapped focus, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space.
public	RadialGradientPaint(Point2D the center point in user space of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. center, float the radius of the circle defining the extents of the color gradient radius, Point2D the point in user space to which the first color is mapped focus, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod, MultipleGradientPaint.ColorSpaceType which color space to use for interpolation, either `SRGB` or `LINEAR_RGB` colorSpace, AffineTransform transform to apply to the gradient gradientTransform) Constructs a `RadialGradientPaint`.
public	RadialGradientPaint(Rectangle2D the bounding box, in user space, of the circle defining the outermost extent of the gradient gradientBounds, float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient fractions, Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. colors, MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space.

Method Summary

Modifier and Type	Method and Description
public PaintContext	Returns: the `PaintContext` for generating color patterns. createContext(ColorModel the preferred `ColorModel` which represents the most convenient format for the caller to receive the pixel data, or `null` if there is no preference. cm, Rectangle the device space bounding box of the graphics primitive being rendered. deviceBounds, Rectangle2D the user space bounding box of the graphics primitive being rendered. userBounds, AffineTransform the `AffineTransform` from user space into device space. transform, RenderingHints the set of hints that the context object can use to choose between rendering alternatives. hints) Implements java.awt.Paint.createContext. Creates and returns a `PaintContext` used to generate a circular radial color gradient pattern.
private static AffineTransform	createGradientTransform(Rectangle2D r)
public Point2D	Returns: a `Point2D` object that is a copy of the center point getCenterPoint() Returns a copy of the center point of the radial gradient.
public Point2D	Returns: a `Point2D` object that is a copy of the focus point getFocusPoint() Returns a copy of the focus point of the radial gradient.
public float	Returns: the radius of the circle defining the radial gradient getRadius() Returns the radius of the circle defining the radial gradient.

Inherited from java.awt.MultipleGradientPaint:: getColors getColorSpace getCycleMethod getFractions getTransform getTransparency

Field Detail

center	back to summary
private final Point2D center Center of the circle defining the 100% gradient stop X coordinate.

focus	back to summary
private final Point2D focus Focus point which defines the 0% gradient stop X coordinate.

radius	back to summary
private final float radius Radius of the outermost circle defining the 100% gradient stop.

Constructor Detail

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors) Constructs a `RadialGradientPaint` with a default `NO_CYCLE` repeating method and `SRGB` color space, using the center as the focus point. Parameters cx:float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy:float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. radius:float the radius of the circle defining the extents of the color gradient fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. Exceptions NullPointerException: if `fractions` array is null, or `colors` array is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors)

Constructs a RadialGradientPaint with a default NO_CYCLE repeating method and SRGB color space, using the center as the focus point.

Parameters

cx:float: the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
cy:float: the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
radius:float: the radius of the circle defining the extents of the color gradient
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.

Exceptions

NullPointerException:: if fractions array is null, or colors array is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors) Constructs a `RadialGradientPaint` with a default `NO_CYCLE` repeating method and `SRGB` color space, using the center as the focus point. Parameters center:Point2D the center point, in user space, of the circle defining the gradient radius:float the radius of the circle defining the extents of the color gradient fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. Exceptions NullPointerException: if `center` point is null, or `fractions` array is null, or `colors` array is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors)

Constructs a RadialGradientPaint with a default NO_CYCLE repeating method and SRGB color space, using the center as the focus point.

Parameters

center:Point2D: the center point, in user space, of the circle defining the gradient
radius:float: the radius of the circle defining the extents of the color gradient
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.

Exceptions

NullPointerException:: if center point is null, or fractions array is null, or colors array is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space, using the center as the focus point. Parameters cx:float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy:float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. radius:float the radius of the circle defining the extents of the color gradient fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` Exceptions NullPointerException: if `fractions` array is null, or `colors` array is null, or `cycleMethod` is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod)

Constructs a RadialGradientPaint with a default SRGB color space, using the center as the focus point.

Parameters

cx:float: the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
cy:float: the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
radius:float: the radius of the circle defining the extents of the color gradient
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT

Exceptions

NullPointerException:: if fractions array is null, or colors array is null, or cycleMethod is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space, using the center as the focus point. Parameters center:Point2D the center point, in user space, of the circle defining the gradient radius:float the radius of the circle defining the extents of the color gradient fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` Exceptions NullPointerException: if `center` point is null, or `fractions` array is null, or `colors` array is null, or `cycleMethod` is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod)

Constructs a RadialGradientPaint with a default SRGB color space, using the center as the focus point.

Parameters

center:Point2D: the center point, in user space, of the circle defining the gradient
radius:float: the radius of the circle defining the extents of the color gradient
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT

Exceptions

NullPointerException:: if center point is null, or fractions array is null, or colors array is null, or cycleMethod is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(float cx, float cy, float radius, float fx, float fy, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space. Parameters cx:float the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. cy:float the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. radius:float the radius of the circle defining the extents of the color gradient fx:float the X coordinate of the point in user space to which the first color is mapped fy:float the Y coordinate of the point in user space to which the first color is mapped fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` Exceptions NullPointerException: if `fractions` array is null, or `colors` array is null, or `cycleMethod` is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(float cx, float cy, float radius, float fx, float fy, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod)

Constructs a RadialGradientPaint with a default SRGB color space.

Parameters

cx:float: the X coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
cy:float: the Y coordinate in user space of the center point of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
radius:float: the radius of the circle defining the extents of the color gradient
fx:float: the X coordinate of the point in user space to which the first color is mapped
fy:float: the Y coordinate of the point in user space to which the first color is mapped
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT

Exceptions

NullPointerException:: if fractions array is null, or colors array is null, or cycleMethod is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space. Parameters center:Point2D the center point, in user space, of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. radius:float the radius of the circle defining the extents of the color gradient focus:Point2D the point in user space to which the first color is mapped fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` Exceptions NullPointerException: if one of the points is null, or `fractions` array is null, or `colors` array is null, or `cycleMethod` is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod)

Constructs a RadialGradientPaint with a default SRGB color space.

Parameters

center:Point2D: the center point, in user space, of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
radius:float: the radius of the circle defining the extents of the color gradient
focus:Point2D: the point in user space to which the first color is mapped
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT

Exceptions

NullPointerException:: if one of the points is null, or fractions array is null, or colors array is null, or cycleMethod is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod, MultipleGradientPaint.ColorSpaceType colorSpace, AffineTransform gradientTransform) Constructs a `RadialGradientPaint`. Parameters center:Point2D the center point in user space of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle. radius:float the radius of the circle defining the extents of the color gradient focus:Point2D the point in user space to which the first color is mapped fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` colorSpace:MultipleGradientPaint.ColorSpaceType which color space to use for interpolation, either `SRGB` or `LINEAR_RGB` gradientTransform:AffineTransform transform to apply to the gradient Annotations @ConstructorProperties:centerPoint, radius, focusPoint, fractions, colors, cycleMethod, colorSpace, transform Exceptions NullPointerException: if one of the points is null, or `fractions` array is null, or `colors` array is null, or `cycleMethod` is null, or `colorSpace` is null, or `gradientTransform` is null IllegalArgumentException: if `radius` is non-positive, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod, MultipleGradientPaint.ColorSpaceType colorSpace, AffineTransform gradientTransform)

Constructs a RadialGradientPaint.

Parameters

center:Point2D: the center point in user space of the circle defining the gradient. The last color of the gradient is mapped to the perimeter of this circle.
radius:float: the radius of the circle defining the extents of the color gradient
focus:Point2D: the point in user space to which the first color is mapped
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT
colorSpace:MultipleGradientPaint.ColorSpaceType: which color space to use for interpolation, either SRGB or LINEAR_RGB
gradientTransform:AffineTransform: transform to apply to the gradient

Annotations

@ConstructorProperties:centerPoint, radius, focusPoint, fractions, colors, cycleMethod, colorSpace, transform

Exceptions

NullPointerException:: if one of the points is null, or fractions array is null, or colors array is null, or cycleMethod is null, or colorSpace is null, or gradientTransform is null
IllegalArgumentException:: if radius is non-positive, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

RadialGradientPaint back to summary

RadialGradientPaint	back to summary
public RadialGradientPaint(Rectangle2D gradientBounds, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod) Constructs a `RadialGradientPaint` with a default `SRGB` color space. The gradient circle of the `RadialGradientPaint` is defined by the given bounding box. This constructor is a more convenient way to express the following (equivalent) code: double gw = gradientBounds.getWidth(); double gh = gradientBounds.getHeight(); double cx = gradientBounds.getCenterX(); double cy = gradientBounds.getCenterY(); Point2D center = new Point2D.Double(cx, cy); AffineTransform gradientTransform = new AffineTransform(); gradientTransform.translate(cx, cy); gradientTransform.scale(gw / 2, gh / 2); gradientTransform.translate(-cx, -cy); RadialGradientPaint gp = new RadialGradientPaint(center, 1.0f, center, fractions, colors, cycleMethod, ColorSpaceType.SRGB, gradientTransform); Parameters gradientBounds:Rectangle2D the bounding box, in user space, of the circle defining the outermost extent of the gradient fractions:float[] numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient colors:Color[] array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle. cycleMethod:MultipleGradientPaint.CycleMethod either `NO_CYCLE`, `REFLECT`, or `REPEAT` Exceptions NullPointerException: if `gradientBounds` is null, or `fractions` array is null, or `colors` array is null, or `cycleMethod` is null IllegalArgumentException: if `gradientBounds` is empty, or `fractions.length != colors.length`, or `colors` is less than 2 in size, or a `fractions` value is less than 0.0 or greater than 1.0, or the `fractions` are not provided in strictly increasing order

public RadialGradientPaint(Rectangle2D gradientBounds, float[] fractions, Color[] colors, MultipleGradientPaint.CycleMethod cycleMethod)

Constructs a RadialGradientPaint with a default SRGB color space. The gradient circle of the RadialGradientPaint is defined by the given bounding box.

This constructor is a more convenient way to express the following (equivalent) code:

    double gw = gradientBounds.getWidth();
    double gh = gradientBounds.getHeight();
    double cx = gradientBounds.getCenterX();
    double cy = gradientBounds.getCenterY();
    Point2D center = new Point2D.Double(cx, cy);

    AffineTransform gradientTransform = new AffineTransform();
    gradientTransform.translate(cx, cy);
    gradientTransform.scale(gw / 2, gh / 2);
    gradientTransform.translate(-cx, -cy);

    RadialGradientPaint gp =
        new RadialGradientPaint(center, 1.0f, center,
                                fractions, colors,
                                cycleMethod,
                                ColorSpaceType.SRGB,
                                gradientTransform);

Parameters

gradientBounds:Rectangle2D: the bounding box, in user space, of the circle defining the outermost extent of the gradient
fractions:float[]: numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient
colors:Color[]: array of colors to use in the gradient. The first color is used at the focus point, the last color around the perimeter of the circle.
cycleMethod:MultipleGradientPaint.CycleMethod: either NO_CYCLE, REFLECT, or REPEAT

Exceptions

NullPointerException:: if gradientBounds is null, or fractions array is null, or colors array is null, or cycleMethod is null
IllegalArgumentException:: if gradientBounds is empty, or fractions.length != colors.length, or colors is less than 2 in size, or a fractions value is less than 0.0 or greater than 1.0, or the fractions are not provided in strictly increasing order

public final Class RadialGradientPaint

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