Examples of com.sun.pdfview.pattern.PDFShader

com.sun.pdfview.pattern.PDFShader

A PDFShader fills a given region with a shading, such as a gradient.

Shading Dictionaries (section 4.6)
A shading dictionary specifies details of a particular gradient fill, including the type of shading to be used, the geometry of the area to be shaded, and the geometry of the gradient fill. Various shading types are available, depending on the value of the dictionary’s ShadingType entry:

Function-based shadings (type 1) define the color of every point in the domain using a mathematical function (not necessarily smooth or continuous).

Axial shadings (type 2) define a color blend along a line between two points, optionally extended beyond the boundary points by continuing the boundary colors.

Radial shadings (type 3) define a blend between two circles, optionally extended beyond the boundary circles by continuing the boundary colors. This type of shading is commonly used to represent three-dimensional spheres and cones.

Free-form Gouraud-shaded triangle meshes (type 4) define a common construct used by many three-dimensional applications to represent complex colored and shaded shapes. Vertices are specified in free-form geometry.

Lattice-form Gouraud-shaded triangle meshes (type 5) are based on the same geometrical construct as type 4 but with vertices specified as a pseudorectangular lattice.

Coons patch meshes (type 6) construct a shading from one or more color patches, each bounded by four cubic Bézier curves.

Tensor-product patch meshes (type 7) are similar to type 6 but with additional control points in each patch, affording greater control over color mapping.

Table 4.28 shows the entries that all shading dictionaries share in common; entries specific to particular shading types are described in the relevant sections below.


    /**
     * build a shader from a dictionary.
     */
    private void doShader(PDFObject shaderObj) throws IOException {
        PDFShader shader = PDFShader.getShader(shaderObj, resources);


        cmds.addPush();


        Rectangle2D bbox = shader.getBBox();
        if (bbox != null) {
            cmds.addFillPaint(shader.getPaint());
            cmds.addPath(new GeneralPath(bbox), PDFShapeCmd.FILL);
        }


        cmds.addPop();
    }


    /**
     * build a shader from a dictionary.
     */
    private void doShader(PDFObject shaderObj) throws IOException {
        PDFShader shader = PDFShader.getShader(shaderObj, this.resources);


        this.cmds.addPush();


        Rectangle2D bbox = shader.getBBox();
        if (bbox != null) {
            this.cmds.addFillPaint(shader.getPaint());
            this.cmds.addPath(new GeneralPath(bbox), PDFShapeCmd.FILL);
        }
        else {
          //if no bounding box is set, use the default user space
            this.cmds.addFillPaint(shader.getPaint());
            this.cmds.addPath(new GeneralPath(this.cmds.getBBox()), PDFShapeCmd.FILL);
        }


        this.cmds.addPop();
    }

Related Classes of com.sun.pdfview.pattern.PDFShader

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