polygon

问题 I'm working in javascript finding that if the point i have is inside a polygon. I'm using ray-casting algorithm to compare that if the point is inside the polygon or not. The algo is working perfect for some case. But for some case it show the point is outside even when the points are lying all inside the polygon. !https://www.dropbox.com/s/rpxqnw9re3q6vsi/Screen%20Shot.png?dl=0 The area marked A1 is the parent polygon, and A2 and A3 are inside the parent polygon. Below the the function i'm

问题 I am using Cesiumjs to create a polygon which is moving around an area. To show its movement I tried to create a sampledProperty of PolygonHierarchy . Each sample is an array of Cartesian3 positions (three endpoints of my polygon at each time step). I need to know the type of the property that I am using in sampledProperty as it is mentioned in Cesiumjs website: Cesiumjs.org/SampledProperty. But I don't know how to define it and I couldn't find any explanation on the website on how to

问题 How can I convert the wpf polygon shape as a bitmap image? I am trying to send as Visual parameter to change as bitmap, but it doesn't seem to be working. Is there any other way to convert the WPF polygon to bitmap? am using like below RenderTargetBitmap RTbmap = new RenderTargetBitmap((int)yellowPolygon.Width, (int)yellowPolygon.Height, 96, 96, PixelFormats.Default); RTbmap.Render(yellowPolygon); image1.Source = RTbmap; 回答1: Change Width and Height to ActualWidth and ActualHeight . Line,

问题 I am having some difficulties in R trying to calculate the area of overlap between polygons. As an example, for Switzerland I have data on the administrative boundaries of the cantons and the ethnic groups in the country. ## Libraries library(sp) library(spdep) library(maptools) library(rgeos) ## Data print(load(url("http://gadm.org/data/rda/CHE_adm1.RData"))) greg<-readShapeSpatial("raw_data/GREG.shp", proj4string=CRS(" +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0")) switzerland<

问题 I'm working on a geo spatial web app with MongoDB. I have a lot of polygons on a collection with different categories ( COUNTRY , STATE , etc.), and I want to know which is the COUNTRY of a certain STATE but in some cases the border of a neighbour COUNTRY is touching the border of the STATE so when I query the intersection I get 2 countries. I want to calculate the overlapping percentage between the state and both countries to know which one is the parent. I've been looking but I didn't found

问题 Lets say that I've got the coordinates of two Rectangle s, they could be right next to each other or have space between them. I need to draw a PolygonHotSpot around the two rectangles (so it will only cover the two rectangles and the space between them). I've come to find that I have to give the coordinates a clockwise order around the entire polygon, rather than around each rectangle (which works fine for a single rectangle). So given a list of coordinates, is there a way to get them into

问题 So I have a shp-file containing a bunch of polygons. In this case, a polygon is a body of in-land water (like lakes and that kind of stuff). My system is tracking a moving object, so in order to determine what this object is, I would like to see if this object is in water or on land AND how far it is to NEAREST shore (yes, both if it's in or out of water). I will take a sample point from the object once in a while and test it. The system is written in Java, and I have imported GeoTools

问题 I have lot's of polygon drawn. Some of which overlaps. I want to be able to detect a tap inside the polygon and display a dialog saying it was clicked inside the polygon (this polygon should be detected on tap). This kind of property can be seen with ItemizedIconOverlay where we can detect all of the OverlayItem with the tap on the OverlayItem. How to implement this on polygon? The way I draw and add Polygon is: MyPolygon myNewPolygon = new MyPolygon(this); myPolygon.setPoints(Polygon

问题 I'm writing a tiled game board with hexagonal shape tiles using java swing. I'm able to draw polygon with help of this SOF thread. Now I want to add background image to these hexagons and I have totally no idea how to do this. Here is a tutorial that draws background on "Rectangle" but how can I do the same on Hexagon ? 回答1: Create the hexagon using a Shape. Probably a Polygon for this. Set the Shape as a clip for the Graphics2D object. Paint the image. Move the Shape to the next location

问题 I have a matrix A that define ordered segments of a self-intersecting polygon: A <- t(matrix(c( 0, 0 , 1, 0 , 1, -2 , -2, -2 , -2, -1 , 0, -1 , 0, -4 , -1, -4 , -1, -2 , 2, -2 , 2, -3 , 0, -3 , 0, 0), nrow = 2)); par(mfrow=c(1,3)) plot(A, col='red', type= 'l', xlim=c(min(A[,1]),max(A[,1])), ylim=c(min(A[,2]),max(A[,2])), xlab='x', ylab='y'); points(A, col='black', pch = 22); grid() I heed to map the matrix A to an undirected graph where a point (x,y) corresponds to a vertex and a segment