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From: d88-jwa@byse.nada.kth.se (Jon W{tte)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Selecting lines
Message-ID: <1991Mar6.073428.13205@nada.kth.se>
Date: 6 Mar 91 07:34:28 GMT
References: <Mboxnd200UhWE2=qA4@andrew.cmu.edu>
Organization: Royal Institute of Technology, Stockholm, Sweden
Lines: 21

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.

The last time around, the consensus was to use  QuickDraw:

Create an offscreen port with portBits just one/two/(your-marginal)
pixels wide & tall. Draw your stuff, from front to back, in this
port, and see when the portBits change. QuickDraw clipping makes
this quite fast.

>- Brian

							h+@nada.kth.se
							Jon W{tte


"The IM-IV file manager chapter documents zillions of calls, all of which
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