Class PdfFreeFormGouraudShadedTriangleShading


  • public class PdfFreeFormGouraudShadedTriangleShading
    extends AbstractPdfShadingMeshWithFlags
    The class that extends AbstractPdfShading, AbstractPdfShadingMesh and AbstractPdfShadingMeshWithFlags classes and is in charge of Shading Dictionary with free-form Gouraud-shaded triangle mesh type.

    The area to be shaded is defined by a path composed entirely of triangles. The colour at each vertex of the triangles is specified, and a technique known as Gouraud interpolation is used to colour the interiors.

    The object shall be represented as stream containing a sequence of vertex data. Each vertex is specified by the following values, in the order shown: f x y c1 ... cn where: f - the vertex's edge flag, that determines the vertex is connected to other vertices of the triangle mesh. For full description, see ISO-320001 Paragraph 8.7.4.5.5 x, y - vertex's horizontal and vertical coordinates, expressed in the shading's target coordinate space. c1...cn - vertex's colour components.

    If the shading dictionary includes a Function entry, only a single parametric value, t, shall be specified for each vertex in place of the colour components c1...cn.

    • Constructor Detail

      • PdfFreeFormGouraudShadedTriangleShading

        public PdfFreeFormGouraudShadedTriangleShading​(PdfColorSpace cs,
                                                       int bitsPerCoordinate,
                                                       int bitsPerComponent,
                                                       int bitsPerFlag,
                                                       float[] decode)
        Creates the new instance of the class.
        Parameters:
        cs - the PdfColorSpace object in which colour values shall be expressed. The special Pattern space isn't excepted.
        bitsPerCoordinate - the number of bits used to represent each vertex coordinate. The value shall be 1, 2, 4, 8, 12, 16, 24, or 32
        bitsPerComponent - the number of bits used to represent each colour component. The value shall be 1, 2, 4, 8, 12, or 16
        bitsPerFlag - the number of bits used to represent the edge flag for each vertex. The value of BitsPerFlag shall be 2, 4, or 8, but only the least significant 2 bits in each flag value shall be used. The value for the edge flag shall be 0, 1, or 2
        decode - the int[] of numbers specifying how to map vertex coordinates and colour components into the appropriate ranges of values. The ranges shall be specified as follows: [x_min x_max y_min y_max c1_min c1_max … cn_min cn_max]. Only one pair of color values shall be specified if a Function entry is present
      • PdfFreeFormGouraudShadedTriangleShading

        public PdfFreeFormGouraudShadedTriangleShading​(PdfColorSpace cs,
                                                       int bitsPerCoordinate,
                                                       int bitsPerComponent,
                                                       int bitsPerFlag,
                                                       PdfArray decode)
        Creates the new instance of the class.
        Parameters:
        cs - the PdfColorSpace object in which colour values shall be expressed. The special Pattern space isn't excepted
        bitsPerCoordinate - the number of bits used to represent each vertex coordinate. The value shall be 1, 2, 4, 8, 12, 16, 24, or 32
        bitsPerComponent - the number of bits used to represent each colour component. The value shall be 1, 2, 4, 8, 12, or 16
        bitsPerFlag - the number of bits used to represent the edge flag for each vertex. The value of BitsPerFlag shall be 2, 4, or 8, but only the least significant 2 bits in each flag value shall be used. The value for the edge flag shall be 0, 1, or 2
        decode - the PdfArray of numbers specifying how to map vertex coordinates and colour components into the appropriate ranges of values. The ranges shall be specified as follows: [x_min x_max y_min y_max c1_min c1_max … cn_min cn_max]. Only one pair of color values shall be specified if a Function entry is present