Ramer-Douglas-Peucker and Reumann-Witkam line-simplification algorithms on C# - Grasshopper2024-03-29T07:00:32Zhttps://www.grasshopper3d.com/forum/topics/ramer-douglas-peucker-line-simplification-algorithm-on-c?commentId=2985220%3AComment%3A1467609&x=1&feed=yes&xn_auth=noHi denys
Happened some time…tag:www.grasshopper3d.com,2016-02-21:2985220:Comment:14676092016-02-21T04:00:18.870Ztangchihttps://www.grasshopper3d.com/profile/tangchi
<p>Hi denys</p>
<p> <span>Happened some time ago I did a similar Component,but I don't use the <span>Ramer-Douglas-Peucker line-simplification algorithm.<span>I don't know if this is what you want.…</span></span></span></p>
<p><span><span><span><a href="http://storage.ning.com/topology/rest/1.0/file/get/2769112130?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769112130?profile=RESIZE_1024x1024" width="721"></img></a></span></span></span></p>
<p>Hi denys</p>
<p> <span>Happened some time ago I did a similar Component,but I don't use the <span>Ramer-Douglas-Peucker line-simplification algorithm.<span>I don't know if this is what you want.</span></span></span></p>
<p><span><span><span><a href="http://storage.ning.com/topology/rest/1.0/file/get/2769112130?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/2769112130?profile=RESIZE_1024x1024" width="721" class="align-full"/></a></span></span></span></p> Hmm + Hmm
1. After receiving…tag:www.grasshopper3d.com,2016-02-06:2985220:Comment:14565632016-02-06T17:54:48.299Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>Hmm + Hmm</p>
<p>1. After receiving tour mail I sense a <strong>colossal</strong> confusion.</p>
<p>2. Points provided to these ^%### methods [<strong>as test</strong>] ARE not the curve "related" (what a word) points (in plain English: nurbs points or curve span points or cats or dogs) > THEY ARE points extracted by some curve division method.</p>
<p>3. Added the <strong>Hocus Pocus Locus Mk2</strong> (C)(TM)(US ... blah, blah) to shed(?) some(?) light(???) to this confusion. See/Test…</p>
<p>Hmm + Hmm</p>
<p>1. After receiving tour mail I sense a <strong>colossal</strong> confusion.</p>
<p>2. Points provided to these ^%### methods [<strong>as test</strong>] ARE not the curve "related" (what a word) points (in plain English: nurbs points or curve span points or cats or dogs) > THEY ARE points extracted by some curve division method.</p>
<p>3. Added the <strong>Hocus Pocus Locus Mk2</strong> (C)(TM)(US ... blah, blah) to shed(?) some(?) light(???) to this confusion. See/Test this (the bake VS span points thingy) as well:</p>
<p>NOTE: these 2 are not "standalone" stuff > you'll need to get portions of code <strong>that suits you</strong> (case <strong>nurbs</strong> or <strong>curve</strong> or maybe <strong>polyline)</strong> and make accordingly the List of Points as the <strong>proper input</strong> to the reduction methods.</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/2769098180?profile=original"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769098180?profile=RESIZE_1024x1024" width="721"/></a>So in fact (and due to the topology of your curves) you 'll need to use the span point List (case: curve) AND in order to keep the <strong>C1_locus_continuous points</strong> "intact" you'll need the related code from the 2nd C#.</p>
<p>Moral: Hocus Locus Pocus, what else?</p>
<p>Plan Z: Skype.</p> Hmm...
1. Since I have a feel…tag:www.grasshopper3d.com,2016-02-05:2985220:Comment:14555502016-02-05T14:56:43.233Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>Hmm...</p>
<p>1. Since I have a feeling that all the above sound Greek to you (I'm Greek, you know, he he) ... I've added the <strong>Hocus Locus Pocus</strong> C# (C)(TM)(US Patent pending) thingy to safely(?) guide(?) you into the unknown.</p>
<p>2. No curve freak should ignore the Bell curve (have some fun).</p>
<p>best, Lord of Darkness</p>
<p>Hmm...</p>
<p>1. Since I have a feeling that all the above sound Greek to you (I'm Greek, you know, he he) ... I've added the <strong>Hocus Locus Pocus</strong> C# (C)(TM)(US Patent pending) thingy to safely(?) guide(?) you into the unknown.</p>
<p>2. No curve freak should ignore the Bell curve (have some fun).</p>
<p>best, Lord of Darkness</p> Peter, thank you for your hel…tag:www.grasshopper3d.com,2016-02-05:2985220:Comment:14556192016-02-05T14:40:34.801ZDenys Demeshonokhttps://www.grasshopper3d.com/profile/DenisDemeshonok
<p>Peter, thank you for your help! I'll be comprehend your advices.</p>
<p>Peter, thank you for your help! I'll be comprehend your advices.</p> BTW: with regard your specifi…tag:www.grasshopper3d.com,2016-02-05:2985220:Comment:14554512016-02-05T13:16:32.565Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>BTW: with regard your <strong>specific</strong> requirement mailed:</p>
<p>1. Find the appropriate points on the curve (i.e. your desired "points to keep" <strong>at any cost</strong>):</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2769099246?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769099246?profile=original" width="575"></img></a> <a href="http://storage.ning.com/topology/rest/1.0/file/get/2769099517?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769099517?profile=original" width="555"></img></a> 2. Use some method and find the reduced Pts.</p>
<p>3. Then add the…</p>
<p>BTW: with regard your <strong>specific</strong> requirement mailed:</p>
<p>1. Find the appropriate points on the curve (i.e. your desired "points to keep" <strong>at any cost</strong>):</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/2769099246?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769099246?profile=original" width="575"/></a><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/2769099517?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2769099517?profile=original" width="555"/></a>2. Use some method and find the reduced Pts.</p>
<p>3. Then add the Pts from 1 to the List 2 of reduced Points.</p>
<p>4. Sort the List VS the curve (or use some smart way to properly "insert" Pts from 1 to Pts from 2).</p>
<p>public List<Point3d> SortPointsAlongCurve(List<Point3d> points_list, Curve sorting_curve)<br/> {<br/> points_list.Sort((point1, point2) =><br/> {<br/> double point1_t = 0;<br/> double point2_t = 0;<br/> sorting_curve.ClosestPoint(point1, out point1_t);<br/> sorting_curve.ClosestPoint(point2, out point2_t);<br/> return point2_t.CompareTo(point1_t);<br/> });<br/> return points_list;<br/> }</p>
<p>or</p>
<p>public List<Point3d> SortPointsAlongCurve2(List<Point3d> pList, Curve curve)<br/> {<br/> List<Point3d> pSorted = new List<Point3d>();<br/> List<Point3d> pClosest = new List<Point3d>();<br/><br/> for(int i = 0; i < pList.Count;i++){<br/> double t;<br/> curve.ClosestPoint(pList[i], out t);<br/> pClosest.Add(curve.PointAt(t));<br/> }<br/><br/> Point3d pPrev = pClosest[0];<br/> Rhino.Collections.Point3dList points = new Rhino.Collections.Point3dList(pClosest.Skip(1).ToList());<br/><br/> for(int i = 1; i < pClosest.Count;i++){<br/> pSorted.Add(pPrev);<br/><br/> int ind = points.ClosestIndex(pPrev);<br/> Point3d pNext = points[ind];<br/> points.RemoveAt(ind);<br/> <br/> pPrev = pNext;<br/> if(i == pClosest.Count - 1) pSorted.Add(pPrev);<br/> }<br/> return pSorted;<br/> }<br/><br/></p>
<p></p>
<p>5. Do some Polyline or Nurbs .</p> Update: Added a few lines moretag:www.grasshopper3d.com,2016-02-05:2985220:Comment:14552352016-02-05T08:23:54.694Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>Update: Added a few lines more</p>
<p>Update: Added a few lines more</p> Update: Added the Reumann met…tag:www.grasshopper3d.com,2016-02-04:2985220:Comment:14548382016-02-04T19:50:37.374Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>Update: Added the <strong>Reumann</strong> method.</p>
<p>Note: tolerance (tol) has <strong>different meaning</strong> for each method (play with the slider).</p>
<p>Update: Added the <strong>Reumann</strong> method.</p>
<p>Note: tolerance (tol) has <strong>different meaning</strong> for each method (play with the slider).</p> And (requires C++ > C# con…tag:www.grasshopper3d.com,2016-02-04:2985220:Comment:14548242016-02-04T19:07:13.418Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>And (requires C++ > C# conversion):</p>
<p><a href="http://www.codeproject.com/Articles/114797/Polyline-Simplification" target="_blank">http://www.codeproject.com/Articles/114797/Polyline-Simplification</a></p>
<p>And (requires C++ > C# conversion):</p>
<p><a href="http://www.codeproject.com/Articles/114797/Polyline-Simplification" target="_blank">http://www.codeproject.com/Articles/114797/Polyline-Simplification</a></p> Also have some fun with this:tag:www.grasshopper3d.com,2016-02-04:2985220:Comment:14545052016-02-04T18:26:13.097Zpeter fotiadishttps://www.grasshopper3d.com/profile/peterfotiadis
<p>Also have some fun with this:</p>
<p>Also have some fun with this:</p> Incidentally the Polyline Red…tag:www.grasshopper3d.com,2016-02-04:2985220:Comment:14545722016-02-04T18:18:09.348ZDavid Ruttenhttps://www.grasshopper3d.com/profile/DavidRutten
<p>Incidentally the Polyline Reduction component uses Douglas Puecker already.</p>
<p>Incidentally the Polyline Reduction component uses Douglas Puecker already.</p>