polygon

问题 I'm building a polygon in Google Maps through markers that can be dragged to reshape it. So, when there are 3 markers, the polygon is drawn, and further markers are appended in the shape, expanding it. That's fine when the user just want to follow a simple clockwise/counterclockwise pattern, but when he wants to expand the polygon through one of its edges, instead it will append the marker, twisting itself. Here in this example, if we add markers 1, 2 and 3, it will be drawn a simple triangle

问题 I'm new to libGDX and from what I can tell the Intersector class has overlap methods for Rectangle/Rectangle, Circle/Circle, Circle/Rectangle, and Polygon/Polygon, but for some reason it doesn't seem to have any methods for checking Polygon/Rectangle or Polygon/Circle. Is there a recommended way to check for collision between polygon and rect/circle? Also, is there some reason why this has been left out of the Intersector class? (ie, should I avoid it? If so, what's the recommended

问题 I store DbGeography polygon in database. My controller gets polygons from database and I need to convert them to JSON. var polygons = db.Areas .Where(x => x.Type == type) .Select(x => new ViewArea { Id = x.Id, Type = x.Type, Rate = x.Rate, Polygon = x.Polygon, }); return Json(polygons, JsonRequestBehavior.AllowGet); I try to use getJSON to take polygons from server, but can't convert DbGeography to JSON. How to make, that conversion? 回答1: First off, you probably don't want just any old JSON

问题 I'm looking for a way to draw a self intersecting polygon with holes, I'm using the HTML Canvas element. So given 5 points, I want to draw the red one below. This question is essentially the same thing. Note: I don't want to do this using line intersections and adding more points, the actual paths I will be using will be curved. 回答1: You can't draw the first pentagram with a single path in Canvas 2D - the fill rule being used there is even-odd and Canvas fills shapes with the non-zero winding

问题 I have to write a program in Python that reads the value n and draws a polygon of n sides on the screen. I can use either the turtle graphics module or graphics.py module. I know how to draw a polygon when n = the number of points you input and then click n times on the screen, but I'm having some trouble getting an idea on how to transform a number of sides into a polygon. Here's the code I have for the polygon with n number of points: def newPolygon(self,cmd): p = eval(input("how many

问题 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

问题 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

问题 I have three points, for example: Start 194 171 Right 216 131 Left 216 203 I want to get all the points within that triangle. How would I do that efficiently? 回答1: see z3nth10n's answer for better input validation Introduction: The general idea was to get the triangle's edges (y-Wise) for every x in it's range, and then you have all the y's that exist within the triangle for every single x, which with simple conversion turns into all points within the triangle. You can look at it as if you

问题 I want to add a boundary to a specified parcel of land so that it stands out in the map with a colored outline/border. In google maps, this is done using the polygon functionality if you know that path of coordinates to enter to surround the land parcel. However, I do not have the polygon path info, but I do have the both the geocode coordinates for the location and also the Assessor's Parcel Number (APN) for the parcel as well. I found this other SO post that talks a little about how to get

问题 I want to add a boundary to a specified parcel of land so that it stands out in the map with a colored outline/border. In google maps, this is done using the polygon functionality if you know that path of coordinates to enter to surround the land parcel. However, I do not have the polygon path info, but I do have the both the geocode coordinates for the location and also the Assessor's Parcel Number (APN) for the parcel as well. I found this other SO post that talks a little about how to get