polygon

问题 I'm attempting to use the following code to change the color of a polygon on my MapBox map, after it's already been added to the map. parishPolygon990 = L.polygon([ vertices ], { color: "#0000FF" }).addTo(map); console.log(parishPolygon990); // returns #0000FF console.log(parishPolygon990.options['color']); // returns #0000FF parishPolygon990.options.color = '#d31603'; console.log(parishPolygon990); // returns #d31603 console.log(parishPolygon990.options['color']); // returns #d31603 You can

问题 Using the HERE JavaScript API 3.0, is it possible to create geodesic polygons? I.e. draw the shortest path on the actual earth instead of the plain projection. Apparently I wasn't able to find anything in the HERE API documentation. For GoogleMaps this is possible as seen here: https://developers.google.com/maps/documentation/javascript/examples/geometry-headings?csw=1 Thanks in advance! 回答1: Although not available out of the box, It can be implemented using some simple coding. You will find

问题 I hope this question was not asked before, I searched everywhere. My problem is that I'm drawing a set of coordinates on my wpf usercontrol with points, I managed to fill my polygon with background color but not with a stroke. Stoke for some reason is not drawing? Here is my code on the OnRender event using the DrawingContext System.Windows.Media.Pen penDrawing = new System.Windows.Media.Pen(System.Windows.Media.Brushes.OrangeRed, 2); drawingContext.DrawGeometry(System.Windows.Media.Brushes

问题 I want to create an interactive digital canvas that will generate a series of near-square polygons in a grid. The below jsFiddle shows a 2x2 grid system of said polygons. If you inspect the code or refresh the page you'll see the center vertex is a semi-randomly generated point that the 4 adjacent polygons share. I would like to scale this grid to something in the vicinity of 16x16, with each inner vertex being semi-randomly generated, but in its current state the completed code would be

问题 My data.txt file contains the 2D coordinates of points forming a segment of a polygon. These coordinates are evolving over time. The file is structured like this: itr nbr_pts p1.x p1.y ...... pk.x pk.y (itr+1) .......... ..... where pk is the k-th point/vertex of the polygon and nb_pts is the number vertices. My question is how to draw the 2D polygon from its vertices (p1, p2, ...pk) at a certain iteration (row)? In addition, note that there is not only one data file/polygon but N ones: data1

问题 I am trying to display several zipcodes (thus polygons...) on a leaflet map. Data is available as a geojson file here. I chose as an example some zip codes from Seattle. I tried the following (reproducible example): library(jsonlite) library(leaflet) url <- "https://raw.githubusercontent.com/openseattle/seattle-boundaries/master/data/zip-codes.geojson" geojson <- fromJSON(url) map <- leaflet() %>% addTiles() %>% addGeoJSON(geojson) map I could not figure out how to properly set addGeoJSON

问题 I have a location defined by a polygon (e.g.(-8.87 41.86,-8.74 41.98,-8.63 42.06,-8.16 42.13 ...) ) and want to search for places from db within the polygon extended by a distance. Google maps algorithm: http://www.geocodezip.com/v3_map-markers_ConvexHull_extend.asp Any idea how to get extended polygon in PHP/MySQL in order to search for records from MySQL? I use ST_CONTAINS mysql function to search for records within an exact polygon. 来源： https://stackoverflow.com/questions/35848073/how-to

问题 I want to add polygon on google maps view but I have this error no visible @ interface GMSMapView declares the selector add overlay Code: CLLocationCoordinate2D commuterLotCoords[5]={ CLLocationCoordinate2DMake(39.048019,-76.850535), CLLocationCoordinate2DMake(39.048027,-76.850234), CLLocationCoordinate2DMake(39.047407,-76.850181), CLLocationCoordinate2DMake(39.047407,-76.8505), CLLocationCoordinate2DMake(39.048019,-76.850535) }; MKPolygon *commuterPoly1 = [MKPolygon polygonWithCoordinates

问题 I have a Spatial Point DF spo (covering an irregular shaped area of interest). The data are not on a regular grid due to crs transformation. My goal is a raster with predefined resolution and extent of the area of interest ( more spatial point data are to be mapped on this master raster) . Problems start when I rasterize(spo, raster(ncol, nrow, extent, crs), spo$param) I need to adjust nrow and ncol in a way so that I wont get moire patterns of NAs within my area of interest. I can't use a

问题 I am trying to do hole in the polygon using fillRule = 'evenodd' in fabric.js globalCompositeOperation won't work for me, because I need to see shape in the polygon hole like this Here is my code: fiddle There are 2 examples: Fabric.js 2 polygons (doesn't work) native html5 canvas 2 polygons (works) When I set fillRule: 'evenodd' for fabric.js polygon, it is going to the fabric function and it's setting context fill to 'eveneodd' _renderFill: function(ctx) { ... if (this.fillRule === 'evenodd