68SINUS

Author:   STK
Category: Christmas Challenge
System:   C128
Language: Basic 7.0
Len source code: 92
Len exe file:    70
Len code only:   68
Instructions:
DLOAD"68SINUS"
RUN
Description:
As the pattern is perodic in x- and y-direction, two sinus functions are
used. A star is plotted if the absolute values of both functions give the
same result (instead of abs ^2 is used). Two compensate floating point
errors, both values are considered as equal if the absolute difference is
smaller than 0.1.
Comments:
Does also run on C16, C116, Plus4 (Basic 3.5).