Hi...
don't mind you butting in at all..
I had noticed as I was playing with the file
that there was an occasional
error coming up...
I wasn't sure why...!
so thankyou Clars...
have a good weekend...!
alan
----- Original Message -----
From: "Clars" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: 08 December 2000 13:41
Subject: Re: <lingo-l> Lingo question_scrolling images with mouse position
> Hi leon and alan-
>
> Hope you don't mind my butting in...
> That's a nice little script. However, it has a flaw; positioning the
> cursor over the center of the rotating sprite produces a "cannot divide
> by zero" error. One way of amending this is to add a single line:
>
> if x2-x1 = 0 then exit
>
> so the entire script reads:
>
> on exitFrame me
> -- get the mouse location
> p = the mouseLoc
> x1 = p.locH
> y1 = p.locV
>
> -- get the sprite location
> x2 = (sprite me.spriteNum).locH
> y2 = (sprite me. spriteNum). locV
>
> --avoid "cannot divide by zero" error
> if x2-x1 = 0 then exit
>
> -- use atan to compute the angle
> angle = atan(float(y2-y1)/float(x2-x1))
>
> -- correct the angle
> if x1 < x2 then angle = pi()+angle
>
> -- convert the angle to degrees
> angle = angle*360.0/(2.0*pi())
>
> -- set sprite rotation
> (sprite me.spriteNum).rotation = angle + 90
> end
>
> regards,
> Clars
>
> ----------------------------
> Alan Andrews wrote:
> > Hi leon..
> > I found this the other day...
> <snip>
> > I think this may be what you are looking for...
> > regards
> > Alan
> <snip>
>
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