I want to use the drag function for data zoom in echarts, but I want to fetch the data of the zoomed area from the server and draw it again when the data is zoomed.
Is it possible? Please give me any ideas. thanks.
Description:
When Drag area in the chart like below
I don't want the chart to zoom like below. I want to fetch data and redraw chart.
Instead of datazoom, use the brush tool to select a region, on brush end you can get the selected region and ask for the data and redraw the plot.
Listen to the 'dataZoom' event and then pull additional data from your server.
this.chart.on('dataZoom', (params: DataZoomEvent) => {
const options = params.batch[0];
const startTS = options.startValue;
const endTS = options.endValue;
yourService.getData(startTS, endTS).subscribe(data => {
// Replace the old data of your series by the fetched elements
// If you reset the zoom, you will still have the detailed area
});
});
The documentation about the event: https://echarts.apache.org/en/api.html#events.datazoom
Related
I am trying to let the user choose their paint color and then paint polygon on map. I know there is a setFeatureProperty method, but it needs to pass in a feature ID and thus user will need to draw the shape first and then change style. Is there anyway to just change to draw style programmably for future drawing? Any help is appreciated.
Based on the Gist https://gist.github.com/dnseminara/0790e53cef9867e848e716937727ab18
It's possible to get feature ID:
// callback for draw.update and draw.selectionchange
var setDrawFeature = function(e) {
if (e.features.length && e.features[0].type === 'Feature') {
var feat = e.features[0];
drawFeatureID = feat.id;
}
}
I've made this Jsfidle: https://jsfiddle.net/ToniBCN/y79ajgrw/3/ Maybe it could help you because it's easy to change feature color before draw and not after like the example.
I want to show the scale of my leaflet map using L.control.scale() however I want to position the scale the same way as the Google Maps API offers. I need the scale to be inline with map attribution. I have attached an image below.
Google Maps API (how i want it)
Leaflet (how it currently is)
I am using the following code to create the scale and add it to my map.
L.control.scale().addTo(map);
To simply put the scale in the same corner of the map as the attribution, you can just set the position option when you create the scale control:
L.control.scale({position:'bottomright', metric: false}).addTo(map);
To make the scale actually go inline with the attribution, you can create a custom control that includes both the scale widget and the attribution text. Leaflet is designed to be extensible, so you can extend the source code for L.Control.Scale to just add what you need:
L.Control.AttrScale = L.Control.Scale.extend({
onAdd: function (map) {
var className = 'leaflet-control-scale',
wrapper = L.DomUtil.create('div', 'leaflet-control-attr-scale'),
attribution = L.DomUtil.create('div', 'leaflet-control-attribution', wrapper),
container = L.DomUtil.create('div', className, wrapper),
options = this.options;
wrapper.style.display = "flex";
wrapper.style.alignItems = "center";
attribution.innerHTML = "My attribution string";
this._addScales(options, className + '-line', container);
map.on(options.updateWhenIdle ? 'moveend' : 'move', this._update, this);
map.whenReady(this._update, this);
return wrapper;
},
});
map.addControl(new L.Control.AttrScale({position:'bottomright', metric: false}))
The example above shows a static attribution string before the scale. You can still use the normal options to position the control and set whether to show the metric and/or imperial scale. You will probably also want to create the map with the attributionControl: false option, to avoid the default attribution showing.
If you need to dynamically set the attribution message based on the map selection (like the normal attribution control does), look at the source code for L.Control.Attribution to see what extra functionality you need to incorporate into the custom control.
Another developer created our original map but I'm tasked with making some changes. One of these is making sure the activated marker is brought to the front when clicked on (where it is partially overlapped by other markers).
The developers have used mapbox 2.2.2.
I have looked at leafletjs's docs, have followed some instructions on other posted solutions (e.g. solution one and solution two). Neither of these makes any difference.
Examining the marker in Chrome's console I can see the value of options.zIndexOffset is being set (10000 in my test case). I've even set _zIndex to an artificially high value and can see that reflected in the marker's data structure. But visually nothing is changing.
This is how the map is set up initially. All features are from a single geojson feed:
L.mapbox.accessToken = '<access token here>';
var map = L.mapbox.map('map', 'map.id', {
}).setView([37.8, -96], 3);
var jsonFeed, jsonFeedURL;
var featureLayer = L.mapbox.featureLayer()
.addTo(map)
.setFilter(function (f) {
return false;
});
$.getJSON(jsonFeedURL, function (json) {
jsonFeed = json;
jsonFeedOld = json;
// Load all the map features from our json file
featureLayer.setGeoJSON(jsonFeed);
}).done(function(e) {
// Once the json feed has loaded via AJAX, check to see if
// we should show a default view
mapControl.activateInitialItem();
});
Below is a snippet of how I had tried setting values to change the z-index. When a visual marker on the featureLayer is clicked, 'activateMarker' is called:
featureLayer.on('click', function (e) {
mapControl.activateMarker(e);
});
The GEOjson feed has urls for the icons to show, and the active marker icon is switched to an alternative version (which is also larger). When the active feature is a single Point I've tried to set values for the marker (lines commented out, some of the various things I've tried!)
activateMarker: function (e) {
var marker = e.layer;
var feature = e.layer.feature;
this.resetMarkers();
if (feature.properties.hasOwnProperty('icon')) {
feature.properties.icon['oldIcon'] = feature.properties.icon['iconUrl'];
feature.properties.icon['iconUrl'] = feature.properties.icon['iconActive'];
feature.properties.icon['oldIconSize'] = feature.properties.icon['iconSize'];
feature.properties.icon['iconSize'] = feature.properties.icon['iconSizeActive'];
}
if (feature.geometry.type == 'Point') {
marker.setZIndexOffset(10001);
marker.addTo(featureLayer);
}
//featureLayer.setGeoJSON(jsonFeed);
}
Any advice would be greatly appreciated! I'm at the point where I don't know what else to try (and that's saying something).
What probably happens is that you just flush your markers with the last call to .setGeoJSON():
If the layer already has features, they are replaced with the new features.
You correctly adjust the GeoJSON data related to your icon, so that when re-created, your featureLayer can use the new values to show a new icon (depending on how you configured featureLayer).
But anything you changed directly on the marker is lost, as the marker is removed and replaced by a new one, re-built from the GeoJSON data.
The "cleanest" way would probably be to avoid re-creating all features at every click.
Another way could be to also change something else in your GeoJSON data that tells featureLayer to build your new marker (through the pointToLayer option) with a different zIndexOffset option.
I'm building an online version of a boardgame using Leaflet as the viewport.
My source: https://github.com/edenLOL/gotta-chug-em-all/tree/master
What I'm trying to achieve, is a way to spiderfy/spread out markers that land on the same square as each other, including when they move past each other.
I'm using https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet to Spiderfy the markers, which appears to work when clicking the markers.
However, I need these markers to be spiderfied always, without requiring a click event. So I set keepSpiderfied: true for the spiderfier object (oms).
var options = { //**spiderfier
keepSpiderfied: true,
nearbyDistance: 120
};
oms = new OverlappingMarkerSpiderfier(map, options); //**spiderfier
But this doesn't work. I can't seem to load the markers in a spiderfied state, it always requires a click to spiderfy them.
For context, markers are generated dynamically during a prompt before the user sees the map.
('#playerIcons > table > tbody > tr > td').on('click', function(){
pokemonSelected = $(this).attr('class');
if ( !$(this).hasClass('pokemonSelected') ){
playerArray[pokeCounter].pokemon = ''+ pokemonSelected +'';
playerArray[pokeCounter].marker = L.marker([playerArray[pokeCounter].coords[0], playerArray[pokeCounter].coords[1]], {
icon: window[pokemonSelected]
}).addTo(map);
oms.addMarker(playerArray[pokeCounter].marker) //**spiderfier
pokeCounter += 1;
} else {
return false;
};
});
I've also tried using Leaflet/Leaflet.markercluster. This works to an extent, and spiderfies the Markers at defined zoom levels, however the markers don't move, and stay stacked on top of each other.
What am I missing here that could be causing these issues? I don't mind using either Spiderfier or MarkerCluster, as both should be able to provide the solution I'm looking for once either issue is fixed.
Spiderfier: Markers need to spiderfy automatically
MarkerCluster: Markers don't physically move when spiderfying out of cluster
Note: If you decide to open index.html, be aware the Pokemon theme song will autoplay in the background on page load (until the map is drawn), so check your volume :)
I solve the problem like this, using fire('click') аfrom leaflet.
scope.spiderMarker - the marker, i want to spidrefy. In your case i think its playerArray[pokeCounter].marker
try{
scope.spiderMarker.fire('click')}
catch (e) {
console.log(e);
};
If you have 2 pushpins on 'London' at the same geolocation, is there anything in the API to move them apart so they are both visible?
I can only find documentation on their old map points API which had PreventIconCollisions, this is what I want but can't see any reference to this in the new API.
I am using the JavaScript API.
So if I understand correctly, you have similar information on the same location, it this correct?
In order to display both information, you will have two options:
Merge information in the textbox using an appropriate way to present the information inside this ui element (using your own tabbed infobox for example)
Decluster the point manually when you're at a certain level of zoom
There is no default property to set this and it would really messy to do this on many pushpins, but in the main idea, you would have to: detect viewchangeend event, if you're at a certain level of zoom (or higher zoom level) then you're declustering them (I call it decluter nearby pushpins).
// Bind pushpin mouseover.
Microsoft.Maps.Events.addHandler(pin, 'mouseover', function (e) {
var currentPin = e.target;
currentPin.setOptions({ visible: false });
var currentLocation = currentPin.getLocation().clone();
var currentPoint = bmGlobals.geo.map.tryLocationToPixel(currentLocation);
if (currentPin.associatedCluster.length == 2) {
// Display the first pushpin
var pinA = createPin(currentPin.associatedCluster[0]);
var locA = bmGlobals.geo.map.tryPixelToLocation(new Microsoft.Maps.Point(currentPoint.x - pinA.getWidth(), currentPoint.y));
pinA.setLocation(locA);
bmGlobals.geo.layerClusteredPin.push(pinA);
// Display the second pushpin
var pinB = createPin(currentPin.associatedCluster[1]);
var locB = bmGlobals.geo.map.tryPixelToLocation(new Microsoft.Maps.Point(currentPoint.x + pinB.getWidth(), currentPoint.y));
pinB.setLocation(locB);
bmGlobals.geo.layerClusteredPin.push(pinB);
}
});
I will try to write a bing maps module about this, but in the fact, you'll have to get your clustered pushpins (or your own pushpin that has two associated data object) and then you will have to set their position based on the rendering on the client side.
I know this question is really old, but if someone is looking for something similar (clustering the pins) here is a good start: http://rtsinani.github.io/PinClusterer/