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D01168 So, when the user puts up a graph on the screen, the mouse is activated and awaits move- ment and/or clicking, while looping in the routine TMYSELO. When the user clicks on a line (in a line graph), the system must determine if the click was in a graph, on which trace, at what time (x axis) step, and on an input line. If these are true, then the routine RUB- BAND is called, which follows the location of the mouse. If there is a change in the loca- tion of the mouse, then a line in the background color is drawn, effectively erasing the old line, and a new line is drawn to connect the mouse location with the adjacent points. This routine terminates when the user clicks the mouse button a second time. The approach to building the slider is similar to that used in the graphs, though less com- plicated. Here, a routine TDraSOB is used as a modified version of TSELOBJ. When th e user starts up the slider, a group of drawings appear. On the left is a table which allows the user to click in the cell, changing the relative maximum and minimums that the slider can affect a change in the overall maximum and minimum values. The actual rectangle area that changes with the location of the mouse, the slider, is a rectangle drawn with the toolbox call TBOX. Again, in TDIGSOB, the mouse location is constantly being sampled in a loop. As the location of the mouse changes, a box in the background color "erases" the old box, then a new box is drawn reflecting the new location of the mouse. Also, the mouses y or vertical location is converted from screen coordinates to the slider value. On the right pro- tion of the slider group is a hidden dialogue box, where the user can click in the highlighted portion to enter a number via the keyboard. 1.8 System requirements The 24 Month Study Interface was developed on Sun Sparc stations, running BSD UNIX operating system v???? The software that is required is as follows: GKS version? running on Sun View windowing system? the Fortran code Fortran?? ???? UNIX operating system is required to run this inteface because it has been programmed tak- ing advantage of the multi-tasking capabilities of UNIX. The multi-tasking capability allows two processes (or more) processes to be running simultaneously. For instance, the 24MSI application is an a executable file which has been compiled and linked. While the 24MSI is being used, the system executes a separate executable file (the actual 24MSM). In this manner, the 24MSM code could be left completely intact and separate from the inter- face. the user can also run the 24MSM, which exists as a separate executable file. This file is called from the 24MSI, 24 Month Study Proiect Doo.Jrncntation Volwne II 6/8/91 8