polygon

I have the following code, gathered initially from here. , which uses matplotlib, shapely, cartopy to draw a world map. When a click is made, I need to determine on which country it was made. I am able to add a pick_event callback to the canvas, however, it is called on every artist.(cartopy.mpl.feature_artist.FeatureArtist, which corresponds to a country). Given an artist and a mouse event with x, y coordinates, how can I determine containment? I've tried artist.get_clip_box().contains , but it is not really a polygon, rather a plain rectangle. The default containment test for the

I have some points in 3D which are in a single plane. I want to arrange them in clock wise or counter clockwise order. The points can create a concave or convex polygon in a single plane. Can any body give any suggestions? Find the center of all the points, then calculate all the angles from the center to each point. Then sort by angle. Ok, I nearly solve the problem. I got line segment instead of having points in 3d. So, Now I have to arrange line segment in sequence. Which becomes somehow easier for me. I am now able to arrange them in sequence. 来源： https://stackoverflow.com/questions

I have several data frames in R. The first data frame contains the computed convex hull of a set of lat and long coordinates by market (courtesy of chull in R). It looks like this: MyGeo<- "Part of Chicago & Wisconsin" Longitude <- c(-90.31914, -90.61911, -89.37842, -88.0988, -87.44875) Latitude <- c(38.45781, 38.80097, 43.07961, 43.0624,41.49182) dat <- data.frame(Longitude, Latitude, MyGeo) The second has zip codes by their latitude and longitudinal coordinates (courtesy of the US census website). It looks like this: CensuseZip <- c("SomeZipCode1","SomeZipCode2","SomeZipCode3","SomeZipCode4"

I need to draw polygon on google maps using the hard coded values.I have used ngMap ( https://ngmap.github.io/ )and used drawing manager of ngMap to it, because i also want the user to draw polygon dynamically. if i use drawing manager,i am not able to draw polygon with hardcoded values. and also another thing , if the user put the marker on map. i need to get the co-ordinates of it. (for example:get the co-ordinates in alert box or console). can anyone please help me Plunker here: http://plnkr.co/edit/keRsKthRAwX89WOWeYwZ?p=preview <ng-map zoom="12" center="28.623457, 77.196452" map-type-id=

Currently, I am using a convex hull algorithm to get the outer most points from a set of points randomly placed. What I aim to do is draw a polygon from the set of points returned by the convex hull however, when I try to draw the polygon it looks quite strange. My question, how do I order the points so the polygon draws correctly? Thanks. EDIT: Also, I have tried sorting using orderby(...).ThenBy(...) and I cant seem to get it working. user1149913 Have you tried the gift wrapping algorithm ( http://en.wikipedia.org/wiki/Gift_wrapping_algorithm )? This should return points in the correct order

I have been searching everywhere but I could not find an answer. I need to have drawing resizable polygons with mouse interaction but I do not want irregular, overlapping or intersecting polygons in the end. Here is a simple example of drawing resizable polygons http://www.wolfpil.de/polygon.html You can easily create & resize polygons which is great. But I need an extra functionality to detect intersections and NOT allowing weird looking shapes/polygons. You can see the problem in this video: http://www.youtube.com/watch?v=zou2jcGM8zw The only solution for that problem I found at http://www