More Line construction options.

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This provides Line.FromSlopeIntercept, Line.FromRTheta, and Line.FromPointTheta 
factory methods, and tests for same. It also privatizes the Line(Point,Point) 
constructor, on the theory that having both constructors and factory methods is 
a great way to make users never notice the factories.

Because a Line no longer necessarily has user-specified points, this portion of 
Line has been moved to a new LineSegment class, which must be constructed from 
two points, and has an explicit (and cheap) conversion to Line.

I could add LineSegment.DistanceToPoint here, but I thought it would be better 
in a separate issue.

Original issue reported on code.google.com by dales...@gmail.com on 13 Nov 2010 at 1:27

Attachments:

• LineRefactoring.patch

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Original comment by andrew.k...@gmail.com on 13 Nov 2010 at 8:15

• Changed state: Accepted
• Added labels: Priority-Medium, Project-Math

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Merged. Committed in revision 1344. Will be released in version 2.1.5.

I liked the previous path from you more than this, since it required me less to 
modify :) In this patch you forgot to update some docs - Line's sample code was 
still using old constructors. Also you copy-pasted Line's sample into 
LineSegment into left it as it is (I removed that for now until we get better 
sample).

But still looks fine.

Original comment by andrew.k...@gmail.com on 13 Nov 2010 at 4:50

• Changed state: Fixed
• Added labels: Milestone-Coming

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Original comment by andrew.k...@gmail.com on 12 Jan 2011 at 11:45

• Changed state: Released
• Removed labels: Milestone-Coming