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DarkBASIC Discussion / newxvalue

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pagio
22
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Joined: 8th Jan 2003
Location: - Please Select -
Posted: 6th Mar 2003 14:53
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what exacly that command does?
why i should use it
Dont forget the retro games
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arras
22
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Joined: 3rd Feb 2003
Location: Slovakia
Posted: 6th Mar 2003 15:30
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You can use it instead of syn and cos math functions in order to calculate new position if you have angle and distance of movement

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IanM
Retired Moderator
22
Years of Service
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Joined: 11th Sep 2002
Location: In my moon base
Posted: 6th Mar 2003 19:23
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NEWXVALUE(X,ANGLE,SIZE) is simply (SIN(ANGLE)*SIZE)+X

I think these commands were added purely to simplify the maths.

Here's an example
sync on
sync rate 0

` outer circle uses SIN/COS
for angle=0 to 360
x=(SIN(angle)*200)+320
y=(COS(angle)*200)+240
dot x,y
next angle

` inner circle uses NEWXVALUE/NEWZVALUE (see note below)
for angle=0 to 360
x=NEWXVALUE(320,angle,190)
y=NEWZVALUE(240,angle,190)
dot x,y
next angle

sync
wait key

NEWYVALUE produces exactly the same numbers as NEWXVALUE so I'm not sure why it's provided.
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The Darthster
22
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Joined: 25th Sep 2002
Location: United Kingdom
Posted: 7th Mar 2003 00:34
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Here's a comparison of the commands:



Once I was but the learner,
now, I am the Master.
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