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- .\" @(#)intro.4 8.1 (Berkeley) 6/4/93
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- .sh 1 "Cursor Movement Optimizations"
- .pp
- One of the most difficult things to do properly is motion optimization.
- After using
- .Fn gettmode
- and
- .Fn setterm
- to get the terminal descriptions,
- the function
- .Fn mvcur
- deals with this task.
- It usage is simple:
- simply tell it where you are now and where you want to go.
- For example
- .(l
- mvcur(0\*,0\*,LINES/2\*,COLS/2);
- .)l
- .lp
- would move the cursor from the home position (0\*,0)
- to the middle of the screen.
- If you wish to force absolute addressing,
- you can use the function
- .Fn tgoto
- from the
- .b termlib (7)
- routines,
- or you can tell
- .Fn mvcur
- that you are impossibly far away,
- For example,
- to absolutely address the lower left hand corner of the screen
- from anywhere
- just claim that you are in the upper right hand corner:
- .(l
- mvcur(0\*,COLS\-1\*,LINES\-1\*,0);
- .)l
-