polyline

问题 How do you get polyline that already plotted on Google Map as image? Only the polyline, without the map layout. I have plotted the polyline on the Google Map and I want to get the polyline as an image. So it only show the red line without any map https://i.stack.imgur.com/vUqS3.png 回答1: I manage to solve this by changing the coordinate to point private Bitmap createPolylineBitmap() { Bitmap bitmap = Bitmap.createBitmap(mapFragment.getView().getWidth(), mapFragment.getView().getHeight(),

问题 I'm using google map sdk in iOS 7.1 How can I set color for GMSPolyline, the default is black. I have try with setStrokeColor and setSpans: setStrokeColor:UIColorFromRGB(0xff0000, 1) setSpans:@[[GMSStyleSpan spanWithColor:UIColorFromRGB(0xff0000, 1)]] but it no have effect, I can only change the opacity by set alpha. Anyone can help me ? Thank you. 回答1: There are several ways to color polylines. Google's iOS SDK documentation has good info on this. The simplest way is to set the polyline's

问题 I have a polyline shapefile, which represents part of an urban road network. My shapefile contains several line/street segments (in my case 58). By using R-cran, I would like to further divide the polyline segments into smaller parts having equal length (e.g. 10 m). To provide an idea: When I import my polyline shapefile into R, and I create a dataframe, it looks like: # Import the polyline shapefile into a SpatialLinesDataFrame object: # library(sp) sp.roads <- readOGR(dsn="/Users/mgv

问题 I am working on a map of American Community Survey data. Currently I have a primary layer (seen below as plotMerge$incomePerCapita ). It works well, has a fully fleshed out popup, image and all. When I add a second layer, to provide county and regional boundaries, the tract boundaries become un-clickable, seemingly masked by the new layer. If I swap the layer order, the regional boundaries become invisible. map1<-leaflet()%>% addTiles()%>% addPolygons(data = plotMerge, fillColor = ~pal

问题 So I'm trying to plot the output of this Euler integration function: typedef double F(double,double); using std::vector; void euler(F f, double y0, double a, double b, double h,vector<POINT> Points) { POINT Pt; double y_n = y0; double t = a; for (double t = a; t != b; t += h ) { y_n += h * f(t, y_n); Pt.x = t; // assign the x value of the point to t. Pt.y = y_n; // assign the y value of the point to y_n. Points.push_back(Pt); } } // Example: Newton's cooling law double newtonCoolingLaw(double

问题 In my Android app I am already saving some strings to the SharedPreferences and serializing an ArrayList with Strings so this data is saved and can be used for future purposes. Even when the app is closed. A minute ago I discovered that I need to save my PolylineOptions for future use as well. PolylineOptions contain some coordinates to draw a line on my map with a color and width. I discovered that PolylineOptions aren't serializeable like Strings. Is there a way to 'save' my PolylineOptions

问题 I want to draw a curved line between two markers (something like Uber) but there's no method for doing that. is there any idea? 来源： https://stackoverflow.com/questions/49189242/draw-a-curved-line-by-gmspolyline-google-maps-ios-sdk

问题 The title is quite clear, I'm using Leaflet and I need to show only the vertices of a polyline. For exemple see this image : Currently I can only have the black line, I'd like only the red squares. Using markers is not an option for performance issue, my lines can be huge (500 000 vertices) and the use of smoothFactor is a need. Is that possible? If not, does someone knows a plugin that does that, or have a hint on how could I do that by extending the Polyline class? 回答1: What you could do

问题 I am working on a map with Mapbox and Leaflet and I am supposed to let the user draw polygons and calculate and show the are of that polygon and I also need to let the user draw a polyline and show the distance of the polyline. I have figured out the polygon area feature but I cannot figure out how to calculate the distance of a polyline. My code is as follows: loadScript('https://api.tiles.mapbox.com/mapbox.js/plugins/leaflet-draw/v0.2.2/leaflet.draw.js', function(){ loadScript('https://api

问题 I am attempting to draw a nice MKPolyline on an MKPolylineView . Everything is going great so far - the polyline draws just as I want it to and when I want it to using the following code: [[self map] addOverlay:routeLine]; And this method to tell the app how to draw it: - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay { MKOverlayView* overlayView = nil; self.routeLineView = [[MKPolylineView alloc] initWithPolyline:[self routeLine]]; [[self routeLineView]