OpenEuphoria

Cursor positioning

• Posted by alrobnett <alrobnett at alumni.princeton.edu> Jan 09, 2004
• 407 views

I am displaying 63   8-character words in various locations on screen 
and allowing the user to maneuver over them by arrow presses.
The various lineno's, and positions are stored in the sequence   rn_loc 
=  {{1,37,"%8s"...}, {2,16,"%8s"....}, {2,58,"%8s.."}, ... }
(Actually, each sequence element contains some additional word selection 
and formatting information, but this is the main idea)
A "for" loop. 1 to 63, does a beautiful job of positioning and 
displaying the array:
Essentially it is:
    lineno = 1
    pos = 2
    format = 3
    for word_nmbr = 1 to 63  do
       position(rn_loc[word_nmbr][lineno],  rn_loc[word_nmbr][pos])
       printf(1, rn_loc[word_nmbr][format], and code to select the word)
    end for

At the conclusion, the user manuevers to a chosen word via arrow keys. I 
want the cursor to appear at the beginning of the word.
The code I used is
   position(rn_loc[word_nmbr][lineno],  rn_loc[word_nmbr][pos])
   printf(1, "%1s", " ")

The cursor appears on the correct line, but near the left of the screen.
If I substitute explicit line and pos numbers, it works correctly.
    position(2, 40)
    printf(1, "%1s", " "

Trace will not show me rn_loc[word_nmbr][pos],  but the entire sequence, 
rn_loc, still appears to be inact.
The puzzle is that it has just finished using the sequence data to 
locate and print the words, why not the cursor posion?

Allen