I am developing a weather radar viewer using Mapbox. In a certain mode, there are 2 Mapbox maps on the screen at the same time showing different modes of the radar. The maps are locked to each other. When one map moves, rotates, or pans - the other one does as well. I did this by simply passing the properties of one map to the other. In the below screenshot, you will see how they are showing identical locations.
What I want to do is - when the user is hovering the mouse over "map1", I would like an identical (ghost or false) cursor on "map2". Here is what I am looking to do:
(edit: What you are looking at is an actual screenshot. Each map is enclosed in a DIV with 50% width of the screen, if this helps to explain)
I don't know if this is even possible in Mapbox. Hopefully someone can give some guidance as I can't find any other questions related to this and I really have no code to show without knowing where to start.
If you attempt to do this inside Mapbox-GL-JS (for instance, by constantly updating the location of a GeoJSON feature layer), I think the performance will be pretty poor.
But since the two views are exactly locked (and presumably the exact same dimensions), you can just do this at an HTML/CSS level. Detect mouse movement on the first map, and update the location of an absolutely-positioned element hovering over the second map to match.
Another approach would be using a canvas element overlaid over the second map, similarly updated.
Related
I have recently implemented the flutter plugin called flutter_map, using the Mapbox tiles, and would like to know how you guys manage to count the network requests for the Static Tiles. Is it supposed to make a request for every move (zoom in, zoom out, move around, etc.) on the map itself? Is that the intended functioning or is there a way to diminish the number of requests made?Amount of requests made after zooming/panning
Is it supposed to make a request for every move (zoom in, zoom out, move around, etc.) on the map itself?
Yes indeed. The package supports static raster tiles, which means they must be re-downloaded if they change - such as on move or zoom events.
There isn't much in the way you can do about this, as it's a kind-of standard. This is why you'll find a similar thing in other mapping libraries, such as Leaflet.js and others.
See https://docs.mapbox.com/api/maps/static-tiles/ for potential ways to reduce costs whilst maintaining standards.
I'm using Mapbox GL JS. Is there any way I can style my base layer to look like the Mapbox Light example, but showing only the UK?
I assume I would use Mapbox Studio to build my own base layer, but I can't see any way in Studio to filter by country.
If that's not possible, is there any way I could show labels on the UK only, and show other countries as filled polygons? (As per this unanswered question.)
Unfortunately it is not possible to filter by a certain geography when selecting the data source for a layer. If you're working with Mapbox's tiles, they'll always cover the entire planet.
There is the possibility to restrict the map to a certain (rectangular) bounds, with the map.setMaxBounds method (https://www.mapbox.com/mapbox-gl-js/api/#Map#setMaxBounds). This might work reasonably well since you want to restrict the view to the UK, but might not be suitable depending on the geometry you want to restrict the view to.
As a workaround you could create a dataset and add a polygon that covers the entire planet except for the extent you want to show in your map. Then add this dataset in your style as the top most layer and style it with whatever you'd like the empty space in your map to look like.
The workaround has been also suggested in this SO answer, if you can get maptiles for the UK only (the SO answer gives a link, but for Germany) you can
upload them to Mapbox as a dataset, export it to tilesets, and then
to a map as a layer. Delete all other layers
You have also the possibility to Style a single country in Mapbox
studio ref this tutorial. The other countries are still shown, but you can style your map in a way to highlight UK
There is a option that allows you to show only one country highlighted. But drawback is, you lose all the layers and tile-level details. Here is the link https://www.mapbox.com/videos/how-to/map-a-single-country-in-mapbox-studio/.
But if you want to include the tile details as well as whole world map but in that map only one or two or custom amount of countries highlighted, then, from above link of Natural Earth download the zipped file of ne_10m_admin_0_countries and upload.
Go back to your map style, and instead of making a blank one. Add another layer of ne_10m_admin_0_countries in your current map. Select the country in the filter option (in same way as shown in video). And change its opacity. That's it.
Hope it helps. Have a great day.
I have several GeoJSON features on the map and wonder if leaflet could notify me when I am over a feature. I think that's geofencing?
Yes, and there is nothing very complicated to implement it.
What do you mean by "I am over a feature"?
If you mean your mouse pointer or a kind of marker / point that represents your current position, you would simply need a plugin like leaflet-pip to determine which features contain your position, if any (react on map"mousemove" event for the mouse).
If you mean the current map view intersects some of the features, that would be slightly more complex, but still easily solved through another library like turf. Look for turf.intersect method. You would need to iterate over all your features, checked against a rectangle built from the current map view (probably something like: L.rectangle(map.getBounds()).toGeoJSON()).
For an Android App I have created a custom overlay here, to display various items of game data on the map.
In general the overlay works fine and smoothly!
However there is one geometrical constellation which is not working as expected: Some objects within the overlay are not bound to geocoordinates, but to current user location. Now it happens, that Osmdroid is selectively redrawing the screen. When the screen is not focussed to user location, the user location bound stuff is not updated correctly: New stuff gets only drawn in some selective rectangle, old stuff isn't deleted outside that rectangle.
So far I failed to find a mechanism to communicate the required redraw of an overlay to the basic Osmdroid system? I.e. to invalidate the surroundings of the current user location? Any hint, clue or pointer?
By studying the sample code I realized they really consider it the overlay responsibility to issue appropriate invalidate calls to the map component to ensure their own optical integrity.
I am still struggling with the coordinates to do the right invalidate(left, top, right, buttom) calls cause my updates actually happen on location changes and it is unclear to me if the screen pixel of the map to be invalidated need to get measured relative to the old location or the new one. This is actually a timing question.
However taking the CPU byte and issuing postInvalidate() just looks as intended and it is unclear how much performance is really lost.
Am working on a project where we have a Bing map being resized depending on whether or not a panel is shown/hidden on the left-hand side of the map. Because of this, and Microsoft's terms preventing overlaying anything over the logo/copyright, etc, I'm using the VEMap.resize method to resize the map, and then am moving the panel out of the way. The issue is that there's an awkward autopan that occurs as part of the resize - because we're declaring a center point to determine the resize, the map pans to include this point in the center without any control over it. Without declaring a center, the map doesn't pan, but it also doesn't pull the new data (map tiles) in our resize in either, resulting in an awkward grey bar on the right-hand side..
Is there a simple way to either resize the map and disable that autopan, moving the center prior to the panning, or to force the map tiles to be rendered upon the resize itself? Any help would be appreciated.
You may want to try the new version 7.0 as you could get rid of this annoyance by using "map.setView({center: map.getCenter(), animate:false})" after resizing; that should override the nice but annoying pan movement on resize.
However there are a few features (like infoboxes or client-side clustering) currently missing in 7.0 when migrating from 6.3 however and the classnames changed, so you may want to wait for now, however it would be the good moment to prepare yourself for 7.