GRAPH_PAPER
Make Your Own Graph Paper.

GRAPH_PAPER is a FORTRAN90 library, using double precision arithmetic, which can make graph paper.

GRAPH_PAPER generates simple Encapsulated PostScript files (EPS) representing several styles of graph paper.

When I manage to find a pad of printed graph paper, I use it all up in a week. Right now, there are just a couple of options involving simple plain grids, but more may come.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

PS_WRITE is a FORTRAN90 library which can be used to create PostScript image files.

Source Code:

• graph_paper.f90, the source code;
• graph_paper.csh, commands to compile the source code;

Examples and Tests:

• graph_paper_prb.f90, the calling program;
• graph_paper_prb.csh, commands to compile, link and run the calling program;
• graph_paper_prb_output.txt, the output file.

Sample Graph Paper Files:

• hexagonal_1.png, a PNG image of a hexagonal line grid that roughly forms a triangle.
• hexagonal_2.png, a PNG image of a hollow hexagonal dot grid that fills a rectangle. The dots look like "chicken wire", because a central dot of each hexagon has been removed.
• hexagonal_3.png, a PNG image of a hexagonal line grid that fills a rectangle (some minor defects in the image need to be attended to).
• hexagonal_4.png, a PNG image of a hexagonal line grid that fills a rectangle. This is similar to the chicken wire graph, except that no dots are omitted.
• hexagonal_5.png, a PNG image of a 14x14 hexagonal grid suitable for playing HEX.
• polar_1.png, a PNG image of a polar line grid.
• sudoku_blank.png, a PNG image of a sheet of 12 blank sudoku grids.
• sudoku_filled.png, a PNG image of a sheet of 12 sudoku grids, only one of them has a problem set up.
• staggered_2.png, a PNG image of a staggered dot grid.
• triangular_1.png, a PNG image of a triangular line grid.
• triangular_2.png, a PNG image of a triangular dot grid.
• uniform_1.png, a PNG image of a uniform line grid;
• uniform_2.png, a PNG image of a uniform dot grid;
• uniform_3.png, a uniform line grid with heavy guide lines;
• uniform_4.png, a PNG image of a uniform line grid with 12 boxes per inch;

List of Routines:

• CH_CAP capitalizes a single character.
• DEGREES_TO_RADIANS converts an angle from degrees to radians.
• EPS_FILE_HEAD writes header information to an encapsulated PostScript file.
• EPS_FILE_TAIL writes trailer information to an encapsulated PostScript file.
• GET_UNIT returns a free FORTRAN unit number.
• HEXAGON_DRAW draws a hexagon.
• HEXAGONAL_1 draws a hexagonal grid that roughly forms a triangle.
• HEXAGONAL_2 draws a hexagonal grid of dots (no lines).
• HEXAGONAL_3 draws a hexagonal grid that fills a rectangle.
• HEXAGONAL_4 draws a hexagonal grid of dots (no lines).
• HEXAGONAL_5 draws a Hex board.
• I4_SWAP swaps two I4 values.
• POLAR_1 draws a polar grid.
• PS_COLOR_LINE handles the line color.
• PS_COLOR_LINE_SET sets the line color.
• PS_COMMENT inserts a comment into the PostScript file.
• PS_DEFAULT sets the internal settings to their default values
• PS_FILE_CLOSE closes a PostScript file.
• PS_FILE_OPEN opens a new version of a PostScript file with a given name.
• PS_LINE_CLOSED adds the graph of a closed line to a PostScript file.
• PS_PAGE_HEAD writes header information on a new page.
• PS_PAGE_TAIL writes tail information at the end of a page.
• PS_SETTING_INT sets, gets, or prints integer ( kind = 4 ) internal PS_WRITE parameters.
• PS_SETTING_REAL sets, gets, or prints real internal PS_WRITE parameters.
• R8_SWAP swaps two real values.
• S_EQI is a case insensitive comparison of two strings for equality.
• STAGGERED_2 draws a staggered grid of dots (no lines).
• SUDOKU_SHEET_BLANK draws a sheet of 12 blank sudoku grids.
• SUDOKU_SHEET_FILLED draws a sheet of 12 filled sudoku grids.
• SUDOKU_GRID_BLANK draws one blank sudoku grid.
• SUDOKU_GRID_FILLED draws one sudoku grid with some values filled.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TRIANGULAR_1 draws a triangular grid.
• TRIANGULAR_2 draws a triangular grid of dots (no lines).
• UNIFORM_1 draws a uniform grid at 1/4 inch intervals.
• UNIFORM_2 draws a uniform grid of dots (no lines).
• UNIFORM_3 draws a uniform 1/4 inch grid; every fifth line is heavy.
• UNIFORM_4 draws a uniform grid with N boxes per inch.

You can go up one level to the FORTRAN90 source codes.