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Douglas-Peucker Generalization Algorithm for simplifying 2D & 3D polylines and polygons
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| Submitted on: |
5/4/2006 7:04:41 AM |
| By: |
Stavros
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| Level: |
Intermediate |
| User Rating: |
By 18 Users |
| Compatibility: |
VB 6.0 |
| Views: |
27947 |
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(About the author) |
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The process of generalization is normally executed when the map scale has to be reduced. Another usage is in cleaning up noisy representations of polylines, possibly generated by a raster-to-vector conversion (tracing).
Generalization can be seen as a form of lossy data compression; given a large and complicated object, we seek to simplify it by reducing detail. Ideally, we obtain a polyline/polygon with far fewer vertices that looks essentially the same at a target scale. This can be a big win in computer graphics, where replacing a large model with a smaller one might have little visual impact but require significantly less storage space and rendering time.
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'Windows API/Global Declarations for :Douglas-Peucker Generalization Algorithm for simplifying 2D & 3D polylines and polygons
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Other 2 submission(s) by this author
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Other User Comments
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 5/2/2006 4:46:44 AM: Light Templer
Very rara stuff, Stavros! THx for sharing and my ***** for! Regards - LiTe
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5/2/2006 2:13:30 PM: Robert Rayment
Nice explanation ( I had to draw it out on paper first) but holding the D key down and watching the lines disappear ending up with one line - fascinating. Trivial point but I think your starting message box has swapped the left & right mouse buttons.
5/5.
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5/3/2006 12:06:28 AM: Bob Krohn
I love these types of tools.
Thanks
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5/3/2006 1:43:29 PM: Stavros Sirigos
Thank you guys for the feedback and votes!
LiTe: My intent was to post something never done in PSC but still useful/interesting :)
Robert: I'm glad you liked it!Thanks for the msgbox bit.
Bob: You're welcome, buddy
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5/6/2006 3:18:52 AM: Stewart
Very nicely written code, well structured and plenty of well written comments. This is an excellent piece of code :) 5 balls from me
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5/7/2006 3:23:23 PM: Option Explicit
Stavros, this is everything a submission to PSC should be... concisely written and excellently coded. The originality is a huge plus also. 5 generalized globes from me.
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5/7/2006 3:24:02 PM: Option Explicit
Oh, and great documentation also! :D
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5/7/2006 5:20:40 PM: Stavros Sirigos
Stewart & Option Explicit:
Thank you very much for your great and encouraging feedback!
Thanks also to all other people that took the time and voted. :D
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4/11/2007 5:04:43 PM: marshal
Nice Job. It's fun to use and learn from.
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4/9/2008 9:26:08 AM: pietro ing. cecchi
Have my compliments also, dear Stavros...
And an 'excellent' rating, of course... :)
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