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Newcomers DBPro Corner / Rotating directional mouse cursor question

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Lost Dragon
14
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Joined: 22nd Aug 2010
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Posted: 15th Jan 2011 06:13 Edited at: 15th Jan 2011 06:14
I saw some code here.

That thread is too old to post on now.

I was reminded of Ultima 6 and 7, where the mouse cursor would rotate around the character, changing directions depending on how it was oriented on screen.

I hacked this out of it.

But I wonder if there is a better way? I do not understand the math in the function (math is not my thing) and atan produces 3 sets of 0 values, two of which have to be taken care of by extra code (otherwise the sprite mouse cursor shows "north" even though it's west or east of the character).

I've already done the best I know to do.

Graphics are attached.

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luskos
17
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Posted: 15th Jan 2011 13:22
What's the problem here?It isn't accurate enough or simply not fast enough?

Coding is My Kung Fu!
And My Kung Fu is better than Yours!
LBFN
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Location: USA
Posted: 15th Jan 2011 15:45
Use rotate sprite. Here is how I would do it:


I simply use the arrow that faces north and rotate it based upon the angle. Hope this helps.

LB

Agent
20
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Location: Sydney, Australia
Posted: 15th Jan 2011 16:01
I was just going to suggest that, LBFN. This is definitely the best way - use a single sprite and rotate it based on the angle.
Lost Dragon
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Posted: 15th Jan 2011 19:40
Luskos: It was okay, I just wondered if there was a better way. Specifically I didn't understand the math in the function so I thought I'd ask.

LBFN: I like that improvement. Manually drawing arrows in 8 directions was pain! I also like that changing the arrow from inward facing to outward facing is as easy as swapping n.png or s.png.

Thanks all!
Benjamin
21
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Joined: 24th Nov 2002
Location: France
Posted: 15th Jan 2011 19:49
That function basically does the same thing as ATANFULL, just so you know.

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