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#1 2012-07-16 11:44:39

berberberber
Scratcher
Registered: 2012-03-08
Posts: 1000+

Duplicate if blocks

When I view some advanced scratchers project's, they have if blocks with the same boolean statement in them.  AgentRoop did this:

if <touching color [#000000]?>
change y by ([abs v] of (xvel))
 if <touching color [#000000]?>
 change y by (([abs v] of (xvel)) * (-1))
 end
end
What does having multiple if blocks do?  Wouldn't they cancel each other out?

http://i47.tinypic.com/2iaa73k.png

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#2 2012-07-16 11:59:04

TRocket
Scratcher
Registered: 2009-08-18
Posts: 1000+

Re: Duplicate if blocks

in that example, since there's a change y by() block the sprite may not be touching that color anymore. Therefore the second if is more like if still touching color(BLACK)

http://i.imgur.com/1QqnHxQ.png

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#3 2012-07-16 12:01:52

Wes64
Scratcher
Registered: 2011-08-19
Posts: 1000+

Re: Duplicate if blocks

Basically its in the proper order to cancel itself.
So if it is touching black on the FIRST if block and then it moves, it might not be touching black any more.

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