Package com.itextpdf.kernel.colors.gradients

Class AbstractRadialGradientBuilder

java.lang.Object

com.itextpdf.kernel.colors.gradients.AbstractGradientBuilder<RadialGradientPoint>

com.itextpdf.kernel.colors.gradients.AbstractRadialGradientBuilder

All Implemented Interfaces:

IGradientBuilder

Direct Known Subclasses:

RadialGradientBuilder, StrategyBasedRadialGradientBuilder

       public abstract class AbstractRadialGradientBuilder extends AbstractGradientBuilder<RadialGradientPoint>
      

Base class for radial gradient builders implementations.

Constructor Summary

Constructors

Constructor	Description
AbstractRadialGradientBuilder()

Method Summary

Modifier and Type	Method	Description
protected double[]	computeCoveringDomain(RadialGradientPoint[] coords, Rectangle toCover)	Computes the minimal domain that covers the box with vector normals.
protected PdfArray	createCoordsDictEntry(RadialGradientPoint[] coordsPoints)	Converts gradient vector into pdf coordinates array for shading.
protected RadialGradientPoint[]	createCoordsForNewDomain(double[] newDomain, RadialGradientPoint[] baseVector)	Expand the base vector to cover the new domain
protected RadialGradientPoint[]	createCoveringCoordinates(Rectangle targetBoundingBox)	Creates some gradient vector which would cover the target bounding box.
protected AbstractPdfShading	createPdfShading(PdfColorSpace colorSpace, PdfArray coordinates, PdfArray coordinatesDomain, IPdfFunction stopsFunction)	Creates the gradient shading object.
protected double	getBaseVectorLength(RadialGradientPoint[] coordinates)	Evaluates base vector length for future color stops spreading.

Methods inherited from class com.itextpdf.kernel.colors.gradients.AbstractGradientBuilder

addStopColor, buildColor, getGradientVectorWithTransform, getSpread, getStopColors, getToIntervalTransform, isZero, setSpread, setSvgLuminanceMode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AbstractRadialGradientBuilder

             public AbstractRadialGradientBuilder()
            

Method Details

createCoordsForNewDomain

             protected RadialGradientPoint[] createCoordsForNewDomain
             (double[] newDomain, RadialGradientPoint[] baseVector)
            

Expand the base vector to cover the new domain

Specified by:

createCoordsForNewDomain in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

newDomain - the array of exactly two elements that specifies the domain that should be covered by the created vector

baseVector - the array of exactly two elements that specifies the base vector which corresponds to [0, 1] domain

Returns:

the array of two

createCoveringCoordinates

             protected RadialGradientPoint[] createCoveringCoordinates
             (Rectangle targetBoundingBox)
            

Creates some gradient vector which would cover the target bounding box.

Specified by:

createCoveringCoordinates in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

targetBoundingBox - the bounding box to cover

Returns:

constructed gradient vector

getBaseVectorLength

             protected double getBaseVectorLength
             (RadialGradientPoint[] coordinates)
            

Evaluates base vector length for future color stops spreading.

Specified by:

getBaseVectorLength in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

coordinates - the base vector

Returns:

base vector length

createCoordsDictEntry

             protected PdfArray createCoordsDictEntry
             (RadialGradientPoint[] coordsPoints)
            

Converts gradient vector into pdf coordinates array for shading.

Specified by:

createCoordsDictEntry in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

coordsPoints - vector to convert

Returns:

constructed pdf array

createPdfShading

             protected AbstractPdfShading createPdfShading
             (PdfColorSpace colorSpace, PdfArray coordinates, PdfArray coordinatesDomain, IPdfFunction stopsFunction)
            

Creates the gradient shading object.

Specified by:

createPdfShading in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

colorSpace - colorspace to use

coordinates - gradient coordinates

coordinatesDomain - gradient coordinates domain

stopsFunction - color stops function

Returns:

constructed gradient shading

computeCoveringDomain

             protected double[] computeCoveringDomain
             (RadialGradientPoint[] coords, Rectangle toCover)
            

Computes the minimal domain that covers the box with vector normals. The domain corresponding to the initial vector is [0, 1].

Specified by:

computeCoveringDomain in class AbstractGradientBuilder<RadialGradientPoint>

Parameters:

coords - the array of exactly two elements that describe the base vector (corresponding to [0,1] domain, that need to be adjusted to cover the box

toCover - the box that needs to be covered

Returns:

the array of two elements in ascending order specifying the calculated covering domain