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### VECT Files

The conventional suffix for `VECT` files is ``.vect'`.

Syntax:

    [4]VECT
    NPolylines  NVertices  NColors

    Nv[0] ... Nv[NPolylines-1]     # number of vertices
                                               # in each polyline

    Nc[0] ... Nc[NPolylines-1]     # number of colors supplied
                                               # in each polyline

    Vert[0] ... Vert[NVertices-1]  # All the vertices
                                               # (3*NVertices floats)

    Color[0] ... Color[NColors-1]  # All the colors
                                               # (4*NColors floats, RGBA)

`VECT` objects represent lists of polylines (strings of connected line segments, possibly closed). A degenerate polyline can be used to represent a point.

A `VECT` file begins with the key word `VECT` or `4VECT` and three integers: NLines, NVertices, and NColors. Here NLines is the number of polylines in the file, NVertices the total number of vertices, and NColors the number of colors as explained below.

Next come NLines integers

Nv[0] Nv[1] Nv[2] ... Nv[NLines-1]

giving the number of vertices in each polyline. A negative number indicates a closed polyline; 1 denotes a single-pixel point. The sum (of absolute values) of the Nv[i] must equal NVertices.

Next come NLines more integers Nc[i]: the number of colors in each polyline. Normally one of three values:

0
  No color is specified for this polyline. It's drawn in the same color as the previous polyline.
1
  A single color is specified. The entire polyline is drawn in that color.
abs(Nv[i])
  Each vertex has a color. Either each segment is drawn in the corresponding color, or the colors are smoothly interpolated along the line segments, depending on the implementation.

The sum of the Nc[i] must equal NColors.

Next come NVertices groups of 3 or 4 floating-point numbers: the coordinates of all the vertices. If the keyword is 4VECT then there are 4 values per vertex. The first abs(Nv[0]) of them form the first polyline, the next abs(Nv[1]) form the second and so on.

Finally NColors groups of 4 floating-point numbers give red, green, blue and alpha (opacity) values. The first Nc[0] of them apply to the first polyline, and so on.

A VECT BINARY format is accepted; See section Binary format. The binary format exactly follows the ASCII format, with 32-bit ints where integers appear, and 32-bit floats where real values appear.

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