| java.lang.Object java.awt.MultipleGradientPaint java.awt.RadialGradientPaint
RadialGradientPaint | final public class RadialGradientPaint extends MultipleGradientPaint (Code) | | 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 circle's radius will result in the
focus being set to the intersection point of the focus-center line and the
perimeter of the circle.
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 should take when filling color outside the bounds of the circle's radius.
If no cycle method is specified,
NO_CYCLE will be chosen by
default, which means the 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:
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:
See Also: java.awt.Paint See Also: java.awt.Graphics2D.setPaint author: Nicholas Talian, Vincent Hardy, Jim Graham, Jerry Evans since: 1.6 |
Constructor 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 - the X coordinate in user space of the center point of the circle defining the gradient. | 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 - the center point, in user space, of the circle defining the gradient Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. | public | RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors, CycleMethod cycleMethod) Constructs a
RadialGradientPaint with a default
SRGB color space, using the center as the focus point.
Parameters: cx - the X coordinate in user space of the center point of the circle defining the gradient. | public | RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors, CycleMethod cycleMethod) Constructs a
RadialGradientPaint with a default
SRGB color space, using the center as the focus point.
Parameters: center - the center point, in user space, of the circle defining the gradient Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. | public | RadialGradientPaint(float cx, float cy, float radius, float fx, float fy, float[] fractions, Color[] colors, CycleMethod cycleMethod) Constructs a
RadialGradientPaint with a default
SRGB color space.
Parameters: cx - the X coordinate in user space of the center point of the circle defining the gradient. | public | RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, CycleMethod cycleMethod) Constructs a
RadialGradientPaint with a default
SRGB color space.
Parameters: center - the center point, in user space, of the circle defining the gradient. | public | RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, CycleMethod cycleMethod, ColorSpaceType colorSpace, AffineTransform gradientTransform) Constructs a
RadialGradientPaint .
Parameters: center - the center point in user space of the circle defining thegradient. | public | RadialGradientPaint(Rectangle2D gradientBounds, float[] fractions, Color[] colors, 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 - the bounding box, in user space, of the circledefining the outermost extent of the gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. |
RadialGradientPaint | public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors)(Code) | | Constructs a
RadialGradientPaint with a default
NO_CYCLE repeating method and
SRGB color space,
using the center as the focus point.
Parameters: cx - the X coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: cy - the Y coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. throws: NullPointerException - if fractions array is null,or colors array is null throws: 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 | public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors)(Code) | | Constructs a
RadialGradientPaint with a default
NO_CYCLE repeating method and
SRGB color space,
using the center as the focus point.
Parameters: center - the center point, in user space, of the circle defining the gradient Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. throws: NullPointerException - if center point is null,or fractions array is null,or colors array is null throws: 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 | public RadialGradientPaint(float cx, float cy, float radius, float[] fractions, Color[] colors, CycleMethod cycleMethod)(Code) | | Constructs a
RadialGradientPaint with a default
SRGB color space, using the center as the focus point.
Parameters: cx - the X coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: cy - the Y coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT throws: NullPointerException - if fractions array is null,or colors array is null,or cycleMethod is null throws: 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 | public RadialGradientPaint(Point2D center, float radius, float[] fractions, Color[] colors, CycleMethod cycleMethod)(Code) | | Constructs a
RadialGradientPaint with a default
SRGB color space, using the center as the focus point.
Parameters: center - the center point, in user space, of the circle defining the gradient Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT throws: NullPointerException - if center point is null,or fractions array is null,or colors array is null,or cycleMethod is null throws: 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 | public RadialGradientPaint(float cx, float cy, float radius, float fx, float fy, float[] fractions, Color[] colors, CycleMethod cycleMethod)(Code) | | Constructs a
RadialGradientPaint with a default
SRGB color space.
Parameters: cx - the X coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: cy - the Y coordinate in user space of the center point of the circle defining the gradient. The last color of thegradient is mapped to the perimeter of this circle. Parameters: radius - the radius of the circle defining the extents of the color gradient Parameters: fx - the X coordinate of the point in user space to which the first color is mapped Parameters: fy - the Y coordinate of the point in user space to which the first color is mapped Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT throws: NullPointerException - if fractions array is null,or colors array is null,or cycleMethod is null throws: 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 | public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, CycleMethod cycleMethod)(Code) | | Constructs a
RadialGradientPaint with a default
SRGB color space.
Parameters: center - the center point, in user space, of the circle defining the gradient. The last color of the gradient is mappedto the perimeter of this circle. Parameters: radius - the radius of the circle defining the extents of the colorgradient Parameters: focus - the point in user space to which the first color is mapped Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT throws: NullPointerException - if one of the points is null,or fractions array is null,or colors array is null,or cycleMethod is null throws: 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 | public RadialGradientPaint(Point2D center, float radius, Point2D focus, float[] fractions, Color[] colors, CycleMethod cycleMethod, ColorSpaceType colorSpace, AffineTransform gradientTransform)(Code) | | Constructs a
RadialGradientPaint .
Parameters: center - the center point in user space of the circle defining thegradient. The last color of the gradient is mapped tothe perimeter of this circle. Parameters: radius - the radius of the circle defining the extents of thecolor gradient Parameters: focus - the point in user space to which the first color is mapped Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first coloris used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT Parameters: colorSpace - which color space to use for interpolation, either SRGB or LINEAR_RGB Parameters: gradientTransform - transform to apply to the gradient throws: 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 throws: 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 | public RadialGradientPaint(Rectangle2D gradientBounds, float[] fractions, Color[] colors, CycleMethod cycleMethod)(Code) | | 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 - the bounding box, in user space, of the circledefining the outermost extent of the gradient Parameters: fractions - numbers ranging from 0.0 to 1.0 specifying the distribution of colors along the gradient Parameters: colors - array of colors to use in the gradient. The first color is used at the focus point, the last color around theperimeter of the circle. Parameters: cycleMethod - either NO_CYCLE , REFLECT ,or REPEAT throws: NullPointerException - if gradientBounds is null,or fractions array is null,or colors array is null,or cycleMethod is null throws: 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 |
getCenterPoint | public Point2D getCenterPoint()(Code) | | Returns a copy of the center point of the radial gradient.
a Point2D object that is a copy of the center point |
getFocusPoint | public Point2D getFocusPoint()(Code) | | Returns a copy of the end point of the gradient axis.
a Point2D object that is a copy of the focus point |
getRadius | public float getRadius()(Code) | | Returns the radius of the circle defining the radial gradient.
the radius of the circle defining the radial gradient |
|
|