Here is a simple SIN snippet written in a few minutes. Written in DBP, should work in 1.x.
Basically, Sin & Cos will return a value that smoothly goes up & down when you feed it an increasing number.
Looks great.
+ Code Snippetrem 2d text scroller using SIN by David Tattersall (David89)
rem define some variables
string$ = "DarkBASIC Professional! SIN wonders!"
chars = len(string$)
do
rem clear the screen
cls
rem increment root variable
inc i#,0.5
rem set our counter variable
char = chars+1
rem the loop is set like this to allow spacing between the letters
for d = 1 to (chars*10) step 10
rem find the next char in string
dec char
rem grab this from the string
char$ = mid$(string$,char)
rem set text colour
ink rgb(char*10,i#,sin(i#)*100),0
rem write the text - heavy SIN & COS usage!
text mousex()+(sin(i#+d)*(sin(i#)*300)),mousey()+(cos(i#+d)*(sin(i#)*300)),char$
next d
rem sync
sync
loop