Chapter 11 COORDINATE_FRAME

There are 2 different sets of frames used in creating plots. They are DATA and TEXT frames. TEXT is always specified in inches Unless modified by either a SET SIZE or SET UNITS command. The character and symbol sizes and are all specified in tenths of inches. Both of these may be changed by the SET UNITS command. The actual data is in the DATA frame, which is mapped to the physical (TEXT) frame at the time of plotting. The plots are all scaled automatically, unless you use the command SET LIMITS to specify the scale. All commands which plot "things" work in either the DATA or the TEXT frame. You may select the frame with the option DATA or TEXT. In addition if 3d coordinates are used the frame is automatically DATA. The DATA frame is not mapped to the TEXT frame until a plotting command or a command which uses the data frame is used. Plotting commands are JOIN, HISTOGRAM, PLOT and so on. Commands which use the data frame are ARROW DATA, BOX DATA, TITLE DATA and so on. If you wish to have TOPDRAWER automatically set the data frame, you should supply the data before any commands which reference the data frame. Several commands modify the data frame, once it has been defined: SET WINDOW SET LIMITS SET THREE SET SIZE SET SCALE These commands allow you to overlay different plots with different scales. Just reading in new data does not change the current data frame.