docs/old-html/online/xpm.html

   1 <title>xpm file format</title>
   2 <H3>Description</H3>
   3 The GROMACS xpm file format is compatible with the XPixMap format
   4 and is used for storing matrix data.
   5 Thus GROMACS xpm files can be viewed directly with programs like XV.
   6 Alternatively, they can be imported into GIMP and scaled to 300 DPI,
   7 using strong antialiasing for font and graphics.
   8 The first matrix data line in an xpm file corresponds to the last matrix
   9 row.
  10 In addition to the XPixMap format, GROMACS xpm files may contain
  11 extra fields. The information in these fields is used when converting
  12 an xpm file to EPS with
  13 <A HREF="../programs/gmx-xpm2ps.html">gmx xpm2ps</a>.
  14 The optional extra field are:
  15 <ul>
  16 <li>
  17 Before the <tt>gv_xpm</tt> declaration:  <tt>title</tt>, <tt>legend</tt>,
  18 <tt>x-label</tt>, <tt>y-label</tt> and <tt>type</tt>,
  19 all followed by a string.
  20 The <tt>legend</tt> field determines the legend title.
  21 The <tt>type</tt> field must be followed by <tt>"continuous"</tt> or
  22 <tt>"discrete"</tt>,
  23 this determines which type of legend will be drawn in an EPS file,
  24 the default type is continuous.
  25 <li>
  26 The xpm colormap entries may be followed by a string, which is a label for
  27 that color.
  28 <li>
  29 Between the colormap and the matrix data, the fields
  30 <tt>x-axis</tt> and/or <tt>y-axis</tt>
  31 may be present followed by the tick-marks for that axis.
  32 </ul>
  33 The example GROMACS xpm file below contains all the extra fields.
  34 The C-comment delimiters and the colon in the extra fields are optional.
  35 <pre>
  36 /* XPM */
  37 /* This matrix is generated by g_rms. */
  38 /* title:   "Backbone RMSD matrix" */
  39 /* legend:  "RMSD (nm)" */
  40 /* x-label: "Time (ps)" */
  41 /* y-label: "Time (ps)" */
  42 /* type:    "Continuous" */
  43 static char * gv_xpm[] = {
  44 "13 13   6 1",
  45 "A  c #FFFFFF " /* "0" */,
  46 "B  c #CCCCCC " /* "0.0399" */,
  47 "C  c #999999 " /* "0.0798" */,
  48 "D  c #666666 " /* "0.12" */,
  49 "E  c #333333 " /* "0.16" */,
  50 "F  c #000000 " /* "0.2" */,
  51 /* x-axis:  0 40 80 120 160 200 240 280 320 360 400 440 480 */
  52 /* y-axis:  0 40 80 120 160 200 240 280 320 360 400 440 480 */
  53 "FEDDDDCCCCCBA",
  54 "FEDDDCCCCBBAB",
  55 "FEDDDCCCCBABC",
  56 "FDDDDCCCCABBC",
  57 "EDDCCCCBACCCC",
  58 "EDCCCCBABCCCC",
  59 "EDCCCBABCCCCC",
  60 "EDCCBABCCCCCD",
  61 "EDCCABCCCDDDD",
  62 "ECCACCCCCDDDD",
  63 "ECACCCCCDDDDD",
  64 "DACCDDDDDDEEE",
  65 "ADEEEEEEEFFFF"
  66 </pre>