I have two polylines drawn on a google maps api v3 directions service.
My problem is that where they overlap on part of the map, one covers the others. I wish to draw 6 lines in total which are bus routes in my city. All routes come back to the same area of the city but it will be very difficult to distinguish them apart.
Is there a way to slightly offset each line?
function busRoute2(source,destination){
// show route between the points
directionsService = new google.maps.DirectionsService();
directionsDisplay = new google.maps.DirectionsRenderer(
{
suppressMarkers: true,
suppressInfoWindows: true,
polylineOptions: { strokeColor: '#000000', strokeOpacity: 0.5 }
});
directionsDisplay.setMap(map);
var request = {
origin:source,
destination:destination,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function(response, status)
{
if (status == google.maps.DirectionsStatus.OK)
{
directionsDisplay.setDirections(response);
}
});
}
Heres the working code (very basic) polyLine offset map animated Note: The icon 'offset' property is the percent offset of the icon along the line.
You need to manipulate the relative 'path' Coordinates (SVG format) of the icon (in your case a line) itself in order to offset it away from the line
Forget my suggestions. I tried to create a repeat icon (2 pixel dot) repeated every 4 pixels offset from the polyLine. It looks absolutely disgusting and lags the browser.
I am going to have to create a function that edits the coords of the polyline at load time according to angle dLat, dLng and zoom scale.
As you want your markers (stops, buses) and lines to be on one side of the road going one direction and the opposite going back. You also dont want to obscure the road name on the map
If anyone wants to help with this email me at huntington#beachincalifornia.com
Related
Please find the google mapsApi documentation https://developers.google.com/maps/documentation/javascript/shapes#editable
Please zoomout to world view and then expand the region selection towards right in single attempt. At some point you could observe that the selection became unstable and it selects entirely different section of the world.
By default the rectangle selection tool seems to look for shortest possible path to complete the shape. This creates a strange behavior when attempting to draw a very very large region.
I wanted to click and drag a very large region that covered a large geography. I was dragging West to East. Once the size of the object was very large, the selection reserved and was covering a completely different section of the world.
I attempt to expand a boundary to include the entire world. When the boundary goes far enough, again the region appears to be the minimal/smaller area.
Expected behavior was the selector to continue expanding in the direction the user intends. In this case I would expect the selector to continue its west to east expansion.
https://developers.google.com/maps/documentation/javascript/shapes#editable
var bounds = {north: 44.599, south: 44.490, east: -78.443, west: -78.649 }; // Define a rectangle and set its editable property to true. var rectangle = new google.maps.Rectangle({bounds: bounds, editable: true});
Please tries to expands rectangle to further right
Is there a solution to resolve the scenario mentioned?
Please let me know if further details required.
As I said in my comment, when you drag it "too far", the rectangle left and right coordinates (longitude) get inverted.
In other words, if you drag it too far to the right, right will become left and left will be where you dragged the right side to. And the opposite in the other direction. So by comparing where was the left with where is the right or vice-versa, you can detect if your rectangle left and right got inverted and invert it again... This way you can achieve what you want.
And of course if you drag the right side further to the right than where the left was (or the other way around), it will reset, as you can't have a rectangle overlapping itself around the globe.
The UI can be a bit confusing though, as you can see the rectangle lines get inverted but you can't do much about that.
var map;
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(0, 0),
zoom: 2,
zoomControl: false
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
// Set origin bounds
var originBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(-20, -100),
new google.maps.LatLng(20, 20)
);
// Get left/right coords
var left = originBounds.getSouthWest().lng();
var right = originBounds.getNorthEast().lng();
// Create editable rectangle
var rectangle = new google.maps.Rectangle({
bounds: originBounds,
fillColor: 'white',
fillOpacity: .5,
editable: true,
map: map
});
// Check for rectangle bounds changed
google.maps.event.addListener(rectangle, 'bounds_changed', function() {
// Get currents bounds and left/right coords
var newBounds = rectangle.getBounds();
var newLeft = newBounds.getSouthWest().lng();
var newRight = newBounds.getNorthEast().lng();
if ((newRight === left) || (newLeft === right)) {
// User dragged "too far" left or right and rectangle got inverted
// Invert left and right coordinates
rectangle.setBounds(invertBounds(newBounds));
}
// Reset current left and right
left = rectangle.getBounds().getSouthWest().lng();
right = rectangle.getBounds().getNorthEast().lng();
});
}
function invertBounds(bounds) {
// Invert the rectangle bounds
var invertedBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(bounds.getNorthEast().lat(), bounds.getNorthEast().lng()),
new google.maps.LatLng(bounds.getSouthWest().lat(), bounds.getSouthWest().lng())
);
return invertedBounds;
}
initialize();
#map-canvas {
height: 150px;
}
<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>
I'm using leaflet with custom CRS.Simple projection. If I draw a polyline at the page Load it is more or less drawn ok (Although much more accurate in firefox than in chrome) but if I drag the map the polyline remains in the same place of the browser window, so then appears shifted respect of the background map.
Example:
Initial load
After drag the map, the map moves but the polyline remains in the same place
To add the polyline I'm converting the coordinates to the CRS.Simple projection. I don't think there is a problem here as every other map marker or text appears correctly
.....
//initialize leaflet map
map = L.map('map', {
maxZoom: mapMaxZoom,
minZoom: mapMinZoom,
zoomControl: false,
crs: L.CRS.Simple //simple coordinates system
}).setView([0, 0], mapMaxZoom);
//set the bounds of the map to the current dimension
var mapBounds = new L.LatLngBounds(
map.unproject([0, mapHeight], mapMaxZoom),
map.unproject([mapWidth, 0], mapMaxZoom)
);
//load the tiles
map.fitBounds(mapBounds);
L.tileLayer(mapData.info.tiles+'/{z}/{x}/{y}.png', {
minZoom: mapMinZoom,
maxZoom: mapMaxZoom,
bounds: mapBounds,
attribution: '',
noWrap: true,
continuousWorld: true
}).addTo(map);
.....
var pointList = [getMapCoordinates(1750,1750),
getMapCoordinates(1520,1764),
getMapCoordinates(1300,1560),
getMapCoordinates(1132,1258),
getMapCoordinates(1132,1060),
getMapCoordinates(926,960)];
polyline = new L.Polyline(pointList, {
color: 'red',
weight: 3,
opacity: 0.5,
smoothFactor: 1
});
polyline.addTo(map);
....
function getMapCoordinates(px,py)
{
//as we use simple system, transform the point (based on pixel) on map coordinates that leaflet understand
return map.unproject([px, py], map.getMaxZoom());
}
Any idea what I'm doing wrong, or is it a bug? Any workaround would be appreciated
Ok, it seems the problem was in stable version (0.7.3) Using dev version (1.0-dev) works ok and even solves the problem with the different browser drawing
I was able to set minimum and maximum zoom level for clustered data points in Nokia HERE Maps API 3.0. But, I can't seem to figure out the way to do this for regular markers.
How can I set a minimum and maximum zoom level for markers?
Thank you for any help you can provide.
There is not a mix-max zoom config for a nomal Marker, but it can be easily achieved using Map listener, a simple example is as follows
var minZoom=5;
var maxZoom=13;
marker = new H.map.Marker({ lat:50.16 , lng: 8.63});
map.addObject(marker);
map.addEventListener('mapviewchange', function () {
var zoom=map.getZoom();
if(zoom>=minZoom && zoom<=maxZoom) {
marker.setVisibility(true);
}else{
marker.setVisibility(false);
}
});
I'm trying to let people draw a rectangle on Google Maps and store the bottomLeft and topRight coordinates.
I know I can draw a Rectangle codewise (see: http://code.google.com/intl/nl-NL/apis/maps/documentation/javascript/reference.html#Rectangle), but before i can load the bounds from my DB the people need to define it themself first off course :)
So my question is, how can I let people draw a rectangle on Google Maps (API v3) and store the coordinates of the bottomLeft and topRight corner?
Already got it to work by looking into events. Took a lot of my time to make :)
This is how i've done it for people that need it to:
function mapsInitialize()
{
startPoint = new google.maps.LatLng(lat,lon);
options = { zoom: 16, center: startPoint, mapTypeId: google.maps.MapTypeId.HYBRID};
map = new google.maps.Map(document.getElementById("map_canvas"), options);
google.maps.event.addListener(map, 'click', function(event) {
if (drawing == true){
placeMarker(event.latLng);
if (bottomLeft == null) {
bottomLeft = new google.maps.LatLng(event.latLng.Oa, event.latLng.Pa);
}
else if (topRight == null){
topRight = new google.maps.LatLng(event.latLng.Oa, event.latLng.Pa);
drawing = false;
rectangle = new google.maps.Rectangle();
var bounds = new google.maps.LatLngBounds(bottomLeft, topRight);
var rectOptions = {
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
bounds: bounds
};
rectangle.setOptions(rectOptions);
}
}
});
}
function placeMarker(location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
}
If I understand you properly - You need a way to get users inputting some polyline/polygon. If so - take a look at this example, where polygon is created by clicking a map. It uses some class PolygonCreator and jquery. You can adopt this method, and save result in form field (there possible a number of options: JSON or your own method of serialization)
If you just need to show that polygons on map and nothing more: you even can take advantage of geometry.encoding library and store encoded polylines into database. Or, if you are going to use spatial queries (for instance - detect if some point falls into your polygons) you better use spatial extnsion of some sort: MySQL spatial extensions, PostGIS, etc. In MySQL you can store polyline into Polyline or Polygon typed columns, which is based on OpenGIS formats.
Frankly, here on stackoverflow is a whole bunch of related information.
I managed to center a marker inside a polygon path by extending the getBounds method:
//polyline
google.maps.Polyline.prototype.getBounds = function() {
var bounds = new google.maps.LatLngBounds();
this.getPath().forEach(function(e) {
bounds.extend(e);
});
return bounds;
};
All I have to do is this:
var marker = new google.maps.Marker({
map: map,
position: flight_path.getBounds().getCenter()
});
Now I want the marker to be at 10%, 25% or 95% of the path.
How can I achieve that?
You can use the Geometry library to work this out. Add libraries=geometry to the Google Maps JS URL.
Then use the interpolate function to work out what percentage along your polyline you place your marker.
var inBetween = google.maps.geometry.spherical.interpolate(startLatlng, endLatLng, 0.5); // 50%
This is simple on one polyline, but if you have multiple lines forming one path, it might be a bit trickier! You could then maybe use computeLength to calculate the overall path length, do the maths yourself for where 95% is, and then I'm not sure...