The MIDAS graphics keyword structure can be accessed in two ways. First, you can control the graphics setup in the same way as if you are using the command SET/GRAPH. In that case you are dealing with the keywords PLCSTAT , PLISTAT and PLRSTAT. However, changing these keywords within our application program means that, like with SET/GRAPH, you are changing the user setup of the graphics system. To avoid this problem the setting of the coordinate box, scales, and offsets can be done via the keyword PLRGRAP. This keyword can be manipulated without changing the user setup. PLRGRAP also contains information about which part of a MIDAS image has been plotted. In case you plot image data using the high level graphics interfaces you should set these values correctly, in order to ensure correct output from the high level cursor routine.
The keyword PLCMETA contains the name of active plotfile. The keyword PLCDATA contains information about the data plotted. Although the content is not vital for the performance of the graphics package itself, programmers are advised to fill these keywords properly.
The values in the graphics keywords are not accessed by number but, similar to the SET/GRAPH command, by name. Below, you will find an overview of all relevant graphics keywords in combination with the names of the various entries, and their default values. The routine PCKDEF (PTKDEF) can be used to reset the keywords: PLCSTAT, PLISTAT and PLRSTAT to their default values.
| function: PCKRDI (PTKRDI) and PCKWRI (PTKWRI) | ||||
| keyword | parameter | length | default | description |
| PLISTAT | PMODE | 1 | 2 | pmode mode (ranging from 0 to 2) |
| FONT | 1 | 0 | font used (ranging from 0 to 6) | |
| LTYPE | 1 | 1 | line type (ranging from 0 to 6) | |
| STYPE | 1 | 5 | symbol type (ranging from 0 to 21) | |
| LWIDT | 1 | 1 | line width (ranging from 1 to 4) | |
| TWIDT | 1 | 1 | text width (ranging from 1 to 4) | |
| COLOUR | 1 | 1 | colour (ranging from 0 to 8) | |
| BCOLOUR | 1 | 0 | background colour (0 to 8) | |
| function: PCKRDR (PTKRDR) and PCKWRR (PTKWRR) | ||||
| keyword | parameter | length | default | description |
| PLRSTAT | XAXIS | 4 | 0,0,0,0 | x axis frame limits and ticks |
| YAXIS | 4 | 0,0,0,0 | y axis frame limits and ticks | |
| ZAXIS | 4 | 0,0,0,0 | z axis frame limits and ticks | |
| XSCALE | 1 | 0.0 | scale set by user in x | |
| YSCALE | 1 | 0.0 | scale set by user in y | |
| ZSCALE | 1 | 0.0 | scale set by user in z | |
| XOFFSET | 1 | -999.0 | offset in mm set by user in x | |
| YOFFSET | 1 | -999.0 | offset in mm set by user in y | |
| SSIZE | 1 | 1.0 | symbol size multiplier | |
| TSIZE | 1 | 1.0 | text size multiplier | |
| function: PCKRDC (PTKRDC) and PCKWRC (PTKWRC) | ||||
| keyword | parameter | length | default | description |
| PLCSTAT | BINMODE | 4 | OFF | bin mode: ON or OFF |
| COLMODE | 4 | SUB | colour mode: Sub or Xor | |
| CLEARGRA | 4 | ON | erase for plot commands or over plot | |
| DEBUG | 4 | OFF | debug mode: ON or OFF | |
| FRAME | 4 | AUTO | AUTO scaling or SQUAre frame | |
| XFORMAT | 4 | AUTO | format for values along the x axis or NONE | |
| YFORMAT | 4 | AUTO | format for values along the y axis or NONE | |
| ZFORMAT | 4 | AUTO | format for values along the z axis or NONE | |
| PLCMETA | PLNAME | 80 | unknown | name of plot file |
| PLCDATA | DNAME | 60 | unknown | name of data stucture |
| DTYPE | 20 | unknown | type of data | |
| function: PCKRDR (PTKRDR) and PCKWRR (PTKWRR) | ||||
| keyword | parameter | length | default | description |
| PLRGRAP | XWNDL | 4 | 0,0,0,0 | x axis frame limits and ticks |
| YWNDL | 4 | 0,0,0,0 | y axis frame limits and ticks | |
| ZWNDL | 4 | 0,0,0,0 | z axis frame limits and ticks | |
| SCALE | 3 | 0,0,0 | scale parameters in x, y, z | |
| PIXEL | 4 | 0,0,0,0 | pixel area of BDF file plotted | |
| OFFSET | 2 | -999,-999 | offset parameters in x and y | |