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From: Lawson.English@p88.f15.n300.z1.fidonet.org (Lawson English)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Selecting lines
Message-ID: <4747.27DDB39C@stjhmc.fidonet.org>
Date: 11 Mar 91 18:21:58 GMT
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In article <> ba0k+@andrew.cmu.edu (Brian Patrick Arnold) writes:

>    I need a little help on finding a good algorithm for selecting lines
>as objects, er, the detection of a mouse click "close enough" to a line.

Jon W{tte writes in a message to All

JW> The last time around, the consensus was to use QuickDraw: 
JW> Create an offscreen port with portBits just one/two/(your-marginal) 
JW> pixels wide & tall. Draw your stuff, from front to back, in this 
JW> port, and see when the portBits change. QuickDraw clipping makes 
JW> this quite fast. 
>- Brian

I don't mean to be dense, but I couldn't quite get that...


Could you expand on it a little?


Thanks.

Lawson
 

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