polygon

I'm pretty new to Python so the answer to this question is probably quite simple, but I've looked everywhere and tried a lot but couldn't find the answer. Simplifying a polygon using Shapely may result in an empty polygon. I want to replace the polygon with a point if the polygon is empty. Something that would work like: if mypoly is empty: mypoly = [(0,0)] Given that mypoly is a shapely polygon, you can check if it's empty using is_empty which is built in to Shapely to check for empty ones. from shapely.geometry import Point if mypoly.is_empty: mypoly = Point(0, 0) 来源： https://stackoverflow

I'm struggling with detecting a tap on a GMSPolyline drawn on my Google map, it works just fine with GMSpolygones, but the same approach doesn't seem to work with polyline. My current approach, which works for polygones, is: if (GMSGeometryContainsLocation(coordinate, polygon.path!, false)) { ... } Any suggestions how to detect taps on a polyline? Or just close to it? eshirima According to their API documentation , GMSPolyline inherits from GMSOverlay which means a GMSPolyline has the property tappable . So you'd want something like this let polyLine: GMSPolyline = GMSPolyline(path: newPath)

I have a list of points that in pairs describe a polygon, like this: <0,0><0,1><0,1><1,0><1,0><1,1><1,1><0,0> which is a square. Note that each pair of points describes a line so our square is made up out of the lines <<0,0><0,1>><<0,1><1,0>><<1,0><1,1>><<1,1><0,0>> I do however have to draw these polygons which works fine when the points in question are all properly in order and there are no holes. Unfortunatly this sometimes goes wrong when the input is like <0,0><0,1><1,1><0,0><0,1><1,0><1,0><1,1> and the resulting polygon is weird or when there are several holes in the <0,0><0,2><0,2><2,0>

Using Google Maps V3 API How can I draw a rectangle (It wouldn't exactly be a google map rectangle anymore but a rectangular polygon) around a polygon. Important however is that the rectangle has be rotated around a certain given angle. I do not mean to calculate the min and max of the coord of the polygon first to draw a rectangle and rotate it afterwards; This image may be a better description from what I am trying to accomplish. What I am trying to accomplish is to get the bounding rectangle of the polygon at an angle. This is very similar to finding a bounding box, which is not rotated. If

I'm trying to understand the paper "Clipping of Arbitrary Polygons with Degeneracies" by E. L Foster and J. R. Overfelt [1], which claims to extend the classic Greiner-Hormann polygon clipping algorithm by handling of degeneracies. However, I ran into some difficulties with the procedure they describe. Consider the situation depicted on Figure 6(c) and suppose the polygons are oriented in the same way. Start the labeling phase from the I5 (as opposed from I1, as they do): for both subject polygon S and clipping polygon C, I5 has previous and next labels (on, on). Therefore, according to Table