I know how to enable zooming and panning with the mouse in vega-embed.
I would like to zoom out one step programatically after pushing data into vega-embed. Is this somehow possible?
Related
When I pan the map with the mouse, I want the visible layers to update (before I release the mouse). Ideally, it would actually be preloaded, like the basemaps, so that you don't have to see the unloaded edge of the layers.
Example: Say I have a layer which is a solid red block over the entire map. When I pan, the screen moves so that you see that the red layer doesn't extend to infinity; it's actually covering only the viewport. It now appears as a rectangle which is moving around the screen as you pan, until you release. I want the user to be able to pan and only ever see red. This is a contrived example, but it's the functionality I want.
What doesn't work: I have already tried running a layer.refresh() command on the map's pan event. That won't work until after you release the mouse.
Well, As I am understanding above requirement. you want to add a layer on the ESRI map; which will refresh every time you pan or zoom.
In this case no need to add the layer as ArcGISDynamicMapServiceLayer. Simply add the layer as a feature layer in ondemand mode.
To know about feature layer and its mode please click here...
As we know it request to update layer automatically whenever you change extent of the map.
Hoping I gave you the hint which you are looking for... :)
The question posted below
how to rotate a google map in a web application
can be use to rotate the map by rotating the div which contains the map
but if i do scroll or drag on the map the map is working in unpredictably way is there a way to retain those functionalities as it is
Note: i am rotating the map using div because the aerial tiles are not available at that location.
Please say whether this can be done with some other map api are how to go about it in google map API
It is difficult to answer with certainty unless you post a more complete answer, but I believe your issue is with the corrodinate system.
You are rotating the display of the map, but the x,y coordinates of your mouse are not. When you drag the mouse, the javascript is capturing the mouse movement relative to the screen and then you are rotating the output by 45 degrees. In other words, google maps has no idea that you have rotated it. It would be the same output if you just turned your monitor 90degrees, the mouse is still going to send the same x,y coordinates.
In order to do what I think you want you would need to take over the code handling the movement or accomplish it another way. You will notice that the dragging is disabled on the example you referenced.
This might be a place to start looking for getting the center of the map on mouse events:
https://developers.google.com/maps/documentation/javascript/3.exp/reference#MouseEvent
You might be able to get the current coordinates and "transform" the new coordiantes by looking at this example of getting pixels:
https://developers.google.com/maps/documentation/javascript/examples/map-coordinates
Here is a page explaining some things about transforming coordinate systems:
http://www.continuummechanics.org/cm/coordxforms.html
If this is something that you really have to do, it can probably be done, but it is likely a lot more trouble to get right than it is worth for an average map embed. It might also add a lot of processing that will make the interaction pretty laggy.
After saying all that, I'd still love to see an example of this working so if you do make it work please post some code.
So, i have a really big canvas (width can be exceed 10000px).
I'm looking for a way to navigate into this canvas, like we navigate into google maps.
I should be able to navigate the canvas by clicking the mouse and dragging the canvas with maybe a zoom option.
Do you know an easy way to do that ?
I can create this system but if i can gain some times... Thanks !
When clicking from one marker to another in Google Maps, the map screen animates the move smoothly if both markers are within them initial map view but jumps if one of the markers is off screen.
I'm trying to set up a map which has several locations within the main map area but has one which is 'off screen'. I have a signpost icon to the more distant location within the initial map area which I want to smoothly scroll to the off screen location when clicked (so as to give a better sense of it's relative location). I can't find anything in the Maps API which would let me do this however.
I could zoom out, move and then zoom in again but this looks a bit jarring. Am I missing something in the API, or does anyone have any suggestions?
Unfortunately, I don't think this is possible (without a change from Google). From the v3 API reference for panTo:
Changes the center of the map to the given LatLng. If the change is less than both the width and height of the map, the transition will be smoothly animated.
which implies that if that change is not less than the dimensions of the map, the transition won't be smoothly animated. The other pan methods are similar.
You could try moving in multiple steps but that's a bit of a hack and I suspect the result will be poor.
Sorry that's not very helpful (I have the same problem).
For me this method works, but i'm using Google Maps API v2.
LatLng latLng = new LatLng(lat,lng);
map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, ZOOM_FACTOR));
This animates the camera from current position to the new one.
If you are using Gmaps API V2, then you can implement smooth animated move very easily by using panBy() method. You have to use fromLatLngToContainerPixel() method to find the amount of pixels to pan by.
Here is the bit of code:
var newLoc = map.fromLatLngToContainerPixel(new GLatLng(lat, lng));
map.panBy(new GSize( newLoc.x, newLoc.y ));
However, what I am trying to do is to achieve the same thing in maps API V3, but sadly fromLatLngToContainerPixel() method does not work anymore the way it did :(
I have a web application that needs to display 30,000 markers on a map at the same time. I don't want to use any kind of clustering. I need them to all be displayed.
I also need them to be clickable. The user can click on each point and a popup will come up with information about that point. Even at a low zoom level when there are thousands of markers in a single 256x256 square, the user needs to be able to click on them. It may be cumbersome for the user to click on a point thats bunched up with hundreds of other points, but if there happens to be one marker in the middle of nowhere, I want the user to be able to click on it right there instead of having to zoom in.
How do I do this? I know it's possible because I watched a video on google video where this guy creates a GTileLayerOverlay app that had clickable markers. He didn't explain how it was done though.
Is my only option to just remove the GTileLayerOverlay at high zoom levels and replace it with a true GMarker layer? I really don't want to do that. It seems over engineering to me.
If you were me, how would you go about this?
I found this example is in the Google Maps API Demo Gallery:
Clickable Tile Layer
This example creates a custom map type (GMapType) that shows regional borders and squares for county centers. When the squares are clicked, an info window opens with information about that county. The clickability is accomplished by passing in information about clickable pixel bounds in the cookies attached to the tiles, and doing a client-side check on mouseover for whether the mouse position was within the pixel bounds.
Here's some commentary on his method.
I don't have any experience with GTileLayOverlays, but I believe it is possible to accomplish what you're trying to do without using GMarkers.
Would it be possible to utilize clustering if each cluster could bring up a list of the markers it represents? It seems like having 30,000 markers visible at once would be visually confusing and difficult to navigate .