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CO - COntours into contour storage file

(5/21/97)

PURPOSE

Reads SPIDER image file, extracts equi-intensity contours, and transfers contours into a SPIDER contour metafile.

USAGE

.OPERATION: CO

.NEW CONTOUR FILE: CNT000
[Name for new contour metafile.]

.ENTER MAX. NUMBER OF CONTOURS EXPECTED: 400
[Sets aside storage for this number of contours. The actual number of contours which are plotted will depend on the answers to the next three questions.]

.FILE PREFIX OR TEMPLATE (EG. PIC****): PIC001
[Name of first image file which is to be contoured.]

.ENTER FILE NUMBERS: 1
[Numbers of file in this image file series to be contoured. In this example it is a single file only.]

Lists the maximum and minimum values in the first image.

.STARTING AND ENDING CONTOUR LEVELS: 0.1 10.0
[Contours are drawn between these values.]

.CONTOUR LEVEL INCREMENT (USE INCR. > END FOR ONE LEVEL): 1000.0
[Separation between contour levels.]

If this is a multiple z-level file the user will be asked the z coordinate for each contour.

.ENTER Z COORDINATE: 0.1
[The value for Z can be any size depending upon its meaning in your application.]

As each contour is transferred to the plot file the contour level and the length of the contour are listed.

.SHOW POSTSCRIPT MENU NOW: (Y/N): N
[A 'Y' answer will immediately show the menu obtained with the 'CS DI PO' operation"]

NOTES

  1. To display the plot use "CS DI" for desired device.

  2. Contours will be thinned to < 600 points if possible.

  3. Previously this operation was named 'CO CS'

SUBROUTINES

CNFILE, CNOPN, CSRDCT, CNINT3, CNTUR, CNSCAN, CNTRCE, CNCALC, CSPUSH

CALLER

PLOT1

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