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SteelCat		#1 Posted : 17 May 2020 22:24:07(UTC)
Rank: Advanced Member Groups: Registered Joined: 02/05/2020(UTC) Posts: 41 Was thanked: 3 time(s) in 3 post(s)		Hi everyone, I'm looking for suggestions to find the intersection of two polygons and hatch the result. The most particular case concerns the hatching of a part of polygon intersected by a straight line. I know some basic of X-Y plot to draw a polygon...
		Physics is like sex. Sure, it may give some practical results, but that’s not why we do it. (R. Feynman)
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mkraska		#2 Posted : 17 May 2020 23:12:07(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)		Perhaps the GPC (general polygon clipping library) wrapper plugin might help. The basics are described in section G.3 of the german handbook. You also might have a look at the hatch and fill snippet. GPC.sm (7kb) downloaded 76 time(s). Edited by user 17 May 2020 23:16:17(UTC)  | Reason: Not specified
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
1 user thanked mkraska for this useful post.		on 18/05/2020(UTC)
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Jean Giraud		#3 Posted : 18 May 2020 17:04:20(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Otherwise, piece wise from native Smath ... just demo. Circular Polygon.sm (21kb) downloaded 21 time(s).
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Razonar		#4 Posted : 18 May 2020 18:31:53(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Hi. Maybe you also can check this discussion: https://en.smath.com/for..._Line-intersections.aspx Best regards. Alvaro.
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Jean Giraud		#5 Posted : 19 May 2020 02:56:55(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		IMHO, I don't see much interest for polygon intersection. For your interest: Intersection Pentastar. Maths Polygon Solve Intersection.sm (22kb) downloaded 13 time(s). Maths Polygon Intersection Pentastar.sm (36kb) downloaded 9 time(s).
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Jean Giraud		#6 Posted : 19 May 2020 04:32:09(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Jean Giraud For your interest: Intersection Pentastar. ...labels added, superb for publishing. Maths Polygon Intersection Pentastar.sm (48kb) downloaded 18 time(s).
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SteelCat		#7 Posted : 19 May 2020 17:38:48(UTC)
Rank: Advanced Member Groups: Registered Joined: 02/05/2020(UTC) Posts: 41 Was thanked: 3 time(s) in 3 post(s)		thank you all, I will do some application
		Physics is like sex. Sure, it may give some practical results, but that’s not why we do it. (R. Feynman)
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ianlh		#8 Posted : 23 May 2020 12:37:34(UTC)
Rank: Advanced Member Groups: Registered Joined: 18/12/2014(UTC) Posts: 38		Question: How would you then calculate / determine the length of the clipped line? Interested for tension and shear lengths in unusual shapes
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Jean Giraud		#9 Posted : 23 May 2020 17:24:32(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		... refreshed/generalized/augmented [A, P, CG] 2D Plot Setup Critical Polygon Intersection.sm (32kb) downloaded 17 time(s).
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Jean Giraud		#10 Posted : 23 May 2020 19:04:57(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: ianlh How would you then calculate / determine the length of the clipped line? Interested for tension and shear lengths in unusual shapes From the attached Smath document.
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SteelCat		#11 Posted : 23 May 2020 19:11:13(UTC)
Rank: Advanced Member Groups: Registered Joined: 02/05/2020(UTC) Posts: 41 Was thanked: 3 time(s) in 3 post(s)		Originally Posted by: ianlh Question: How would you then calculate / determine the length of the clipped line? Interested for tension and shear lengths in unusual shapes From coords, using Pitagora's theorem Originally Posted by: Jean Giraud ... refreshed/generalized/augmented [A, P, CG] 2D Plot Setup Critical Polygon Intersection.sm (32kb) downloaded 17 time(s). Very nice.
		Physics is like sex. Sure, it may give some practical results, but that’s not why we do it. (R. Feynman)
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Polygon Intersection Demo (Samples) by Jean Giraud 24/05/2020 04:40:51(UTC)