[Gnuplot-info] User I/O for plot

[Suresh G. <sgo...@ya...>]

Hello,

  I am using the following to plot over 500 rectangles:

      plot  [0:50]  -10*x 

      set object 2 rect from 10, -65 to 6, -143
      set label 3 at 10, -65 "1" front
      replot
      pause mouse key "rectangle 1 - hit tab to clear"; 
      if(MOUSE_KEY == 9) reset

      set object 4 rect from 21, -65 to 17, -143
      set label 5 at 21, -65 "2" front
      replot
      pause mouse key "rectangle 2 - hit tab to clear"; 
      if(MOUSE_KEY == 9) reset

      set object 6 rect from 30, -348 to 6, -387
      set label 7 at 30, -348 "3" front
      replot
      pause mouse key "rectangle 3 - hit tab to clear"; 
      if(MOUSE_KEY == 9) reset

      <etc>

  So after each rectangle is added to the plot, the user 
  is allowed to examine the plot for as long as needed.
  He then has the option to add another rectangle to 
  the plot or to clear the plot and then add another
  rectangle.

  1) Is there a better way to do the User Interaction?

  2) Also, when the user is examining the plot, how to 
     support allowing him to zoom-in into user-specified
     regions?

  3) The only use for the very first plot line is to 
     to specify the size of the canvas.  What's a better
     way to do this?
  
  Thanks,

  --Suresh