const func PRIMITIVE_WINDOW: readPgm (inout file: pgmFile)

Reads a PGM (portable graymap) image file into a pixmap.

Parameters:

pgmFile - File that contains a PGM image.

Returns:

A pixmap with the PGM image, or PRIMITIVE_WINDOW.value if the file does not contain a PGM magic number.

Raises:

RANGE_ERROR - The file is not in the PGM file format.

const func PRIMITIVE_WINDOW: readPgm (in string: pgmFileName)

Reads a PGM file with the given pgmFileName into a pixmap.

Parameters:

pgmFileName - Name of the PGM file.

Returns:

A pixmap with the PGM image, or PRIMITIVE_WINDOW.value if the file cannot be opened or does not contain a PGM magic number.

Raises:

RANGE_ERROR - The file is not in the PGM file format.

const func string: str (in PRIMITIVE_WINDOW: pixmap, PGM)

Converts a pixmap into a string in PGM format.

Parameters:

pixmap - Pixmap to be converted.

Returns:

a string with data in PGM format.