Divide shape into polygons

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I have a shape, described by its edges. For example, this shape:



image1



I want to find all of the polygons that create this shape. Something similar to that:



enter image description here



I managed to do that by rendering an image and then finding its' contours (Something similar to findContours in OpenCV). But by rendering an image and finding shapes within it, I'm losing precision, which is unwanted.




geometry polygons




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    Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
    – dxiv
    Aug 2 at 21:58















up vote
0
down vote

favorite












I have a shape, described by its edges. For example, this shape:



image1



I want to find all of the polygons that create this shape. Something similar to that:



enter image description here



I managed to do that by rendering an image and then finding its' contours (Something similar to findContours in OpenCV). But by rendering an image and finding shapes within it, I'm losing precision, which is unwanted.




geometry polygons




share|cite|improve this question

















  • 2




    Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
    – dxiv
    Aug 2 at 21:58













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have a shape, described by its edges. For example, this shape:



image1



I want to find all of the polygons that create this shape. Something similar to that:



enter image description here



I managed to do that by rendering an image and then finding its' contours (Something similar to findContours in OpenCV). But by rendering an image and finding shapes within it, I'm losing precision, which is unwanted.




geometry polygons




share|cite|improve this question













I have a shape, described by its edges. For example, this shape:



image1



I want to find all of the polygons that create this shape. Something similar to that:



enter image description here



I managed to do that by rendering an image and then finding its' contours (Something similar to findContours in OpenCV). But by rendering an image and finding shapes within it, I'm losing precision, which is unwanted.





geometry polygons





share|cite|improve this question












share|cite|improve this question




share|cite|improve this question








edited Aug 2 at 21:48









Adrian Keister

3,49321533




3,49321533









asked Aug 2 at 21:47









user972014

1011




1011







  • 2




    Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
    – dxiv
    Aug 2 at 21:58













  • 2




    Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
    – dxiv
    Aug 2 at 21:58








2




2




Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
– dxiv
Aug 2 at 21:58





Find the intersections of the edges. Start from one of them and go on an edge. At each intersection, go left if there is an edge that way, otherwise straight ahead if the edge continues, otherwise right. Keep going until you return to the starting point. You just found the first polygon. Repeat as necessary.
– dxiv
Aug 2 at 21:58
















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