Class SVGAlphaComposite

  • All Implemented Interfaces:
    XMLConstants, ErrorConstants, SVGConverter, SVGSyntax, CSSConstants, SVGConstants

    public class SVGAlphaComposite
    extends AbstractSVGConverter
    Utility class that converts an AlphaComposite object into a set of SVG properties and definitions. Here is how AlphaComposites are mapped to SVG: + AlphaComposite.SRC_OVER with extra alpha is mapped to the opacity attribute + AlphaComposite's other rules are translated into predefined filter effects. One of the big differences between AlphaComposite and the SVG feComposite filter is that feComposite does not have the notion of extra alpha applied to the source. The extra alpha equivalent is obtained by setting the opacity property on the nodes to be composited.
    Version:
    $Id: SVGAlphaComposite.java 1808888 2017-09-19 14:22:11Z ssteiner $
    See Also:
    SVGAlphaComposite
    • Field Detail

      • compositeDefsMap

        private java.util.Map compositeDefsMap
        Map of all possible AlphaComposite filter equivalents
      • backgroundAccessRequired

        private boolean backgroundAccessRequired
        By default, access to the background is not required.
    • Constructor Detail

      • SVGAlphaComposite

        public SVGAlphaComposite​(SVGGeneratorContext generatorContext)
        Parameters:
        generatorContext - for use by SVGAlphaComposite to build Elements
    • Method Detail

      • getAlphaCompositeFilterSet

        public java.util.List getAlphaCompositeFilterSet()
        Returns:
        set of all AlphaComposite filter definitions
      • requiresBackgroundAccess

        public boolean requiresBackgroundAccess()
        Returns:
        true if background access is required for any of the converted AlphaComposite rules
      • toSVG

        public SVGDescriptor toSVG​(GraphicContext gc)
        Converts part or all of the input GraphicContext into a set of attribute/value pairs and related definitions
        Parameters:
        gc - GraphicContext to be converted
        Returns:
        descriptor of the attributes required to represent some or all of the GraphicContext state, along with the related definitions
        See Also:
        SVGDescriptor
      • toSVG

        public SVGCompositeDescriptor toSVG​(java.awt.AlphaComposite composite)
        Parameters:
        composite - the AlphaComposite object to convert to SVG
        Returns:
        an SVGCompositeDescriptor that defines how to map the input composite in SVG
      • compositeToSVG

        private org.w3c.dom.Element compositeToSVG​(java.awt.AlphaComposite composite)
        Parameters:
        composite - AlphaComposite to convert to a filter effect
        Throws:
        java.lang.Error - if an AlphaComposite with SRC_OVER rule in passed to this method.