google maps infinite line / increase length or lat lng calculation - javascript

Hey there i´m trying to find a way to just increase the length of a line without changing the orientation
i tried this with Polyline
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 37.4419, lng: -122.1419},
zoom: 8
});
var line = new google.maps.Polyline({
path: [new google.maps.LatLng(37.4419, -122.1419), new google.maps.LatLng(37.4519, -122.1519)],
strokeColor: "#FF0000",
strokeOpacity: 1.0,
strokeWeight: 10,
geodesic: true,
map: map
});
}
and it works as expected
but i rather want it like
or
i only have the two coordinates from first example
it should be geodesic and theoreticaly idealy arround the globe back at same start so it will be like endless
i also tried to find out a way to calculate the some more far coordinates but searching is a mess because everboidy want to be found for caluclating distances.
so having two coordinates following the "line-through orientation" of but have high distance like some thousand kilometers pls let me know

You can use the Google Maps Javascript API Geometry library to compute the heading of the line and extend it an arbitrarily long distance along that heading.
code snippet::
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {
lat: 37.4419,
lng: -122.1419
},
zoom: 8
});
var line = new google.maps.Polyline({
path: [new google.maps.LatLng(37.4419, -122.1419), new google.maps.LatLng(37.4519, -122.1519)],
strokeColor: "#FF0000",
strokeOpacity: 1.0,
strokeWeight: 10,
geodesic: true,
map: map
});
// extend line from each end along its existing heading
// pick 20e6 meters as an arbitrary length
var lineHeading = google.maps.geometry.spherical.computeHeading(line.getPath().getAt(0), line.getPath().getAt(1));
var newPt0 = google.maps.geometry.spherical.computeOffset(line.getPath().getAt(0), 20000000, lineHeading);
line.getPath().insertAt(0, newPt0);
var newPt1 = google.maps.geometry.spherical.computeOffset(line.getPath().getAt(1), 20000000, lineHeading + 180);
line.getPath().push(newPt1);
}
google.maps.event.addDomListener(window, "load", initMap);
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map"></div>

Related

Cannot Draw Polygons in Google Maps

I have a Google Maps API file I'm trying to draw polylines and polygons in. However when I input the code for drawing these, I get an error in Google Chrome saying 'Uncaught SyntaxError: Unexpected end of input' for my closing script bracket (< /script>).
Here is my code:
<script>
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
//center on the US
center: {lat: 39.8283, lng: -98.5795},
zoom: 5
});
// Define the LatLng coordinates for the polygon's path.
var sampleCounty = [
{lat: 32.344437, lng: -86.496774},
{lat: 32.402814, lng: -86.717897},
{lat: 32.340803, lng: -86.814912},
];
// Construct the polygon.
var samplePolygon = new google.maps.Polygon({
paths: sampleCounty,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
});
//place polygon in map
samplePolygon.setMap(map);
//make HTML element change color when polygon is hovered over
google.maps.event.addListener(samplePolygon, 'mouseover', function (event) {
document.getElementById("sampleDescription").style.color = "blue";
});
//make HTML element change color when polygon is not hovered over
google.maps.event.addListener(samplePolygon, 'mouseout', function (event) {
document.getElementById("sampleDescription").style.color = "red";
});
</script><!--end google maps API-->
<!--api link here--><script src="https://maps.googleapis.com/maps/api/js?key=MY_KEY&libraries=places&callback=initAutocomplete" async defer></script>
In my code my API key is there. Does anyone know why this is happening/how to fix it?
There are two issues with your code:
missing close } on the initMap function (causes Uncaught SyntaxError: Unexpected end of input error).
&callback=initAutocomplete in the script include (causes "initAutocomplete is not a function" error), there is no initAutocomplete function in your code, that should be initMap.
If I change those and add the required HTML/CSS, it works.
working code snippet: (note I also changed the center and zoom so you can see the polygon)
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
//center on the US
center: {
lat: 32.402814,
lng: -86.717897
},
zoom: 10
});
// Define the LatLng coordinates for the polygon's path.
var sampleCounty = [{
lat: 32.344437,
lng: -86.496774
},
{
lat: 32.402814,
lng: -86.717897
},
{
lat: 32.340803,
lng: -86.814912
},
];
// Construct the polygon.
var samplePolygon = new google.maps.Polygon({
paths: sampleCounty,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
});
//place polygon in map
samplePolygon.setMap(map);
//make HTML element change color when polygon is hovered over
google.maps.event.addListener(samplePolygon, 'mouseover', function(event) {
document.getElementById("sampleDescription").style.color = "blue";
});
//make HTML element change color when polygon is not hovered over
google.maps.event.addListener(samplePolygon, 'mouseout', function(event) {
document.getElementById("sampleDescription").style.color = "red";
});
}
#map {
height: 100%;
width: 100%;
}
body,
html {
height: 100%;
width: 100%;
padding: 0px;
margin: 0px;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places&callback=initMap" async defer></script>

How to draw a line and a box on gmaps?

I've seen this tool which let you draw a line on gmaps and it generates the js code for you
So the JS is:
var myCoordinates = [
new google.maps.LatLng(48.955410,10.034749),
new google.maps.LatLng(59.648652,29.898030)
];
var polyOptions = {
path: myCoordinates,
strokeColor: "#FF0000",
strokeOpacity: 1,
strokeWeight: 3
}
var it = new google.maps.Polyline(polyOptions);
it.setMap(map);
What I would like to do is to start the line from a pin I receive and not a pin I set when I click as per that tool and then I would to draw a infobox at the end of that line (so not where it starts form the pin).
What I am aiming for is to draw a line form a starting point and have an infobox such as per this image below, see the lines on the map
Therefore I can pass the coords here:
new google.maps.LatLng(48.955410,10.034749),
new google.maps.LatLng(59.648652,29.898030)
But how would I target the end of the line and place text there?
With this answer I can define a start and end, but how to draw a box at the end point?
I think you can do it using a marker at the end point of the line, then attaching, for example an infoWindow, at the end and finally hiding the marker.
function initMap() {
var coordinates = {
lat: 40.785845,
lng: -74.020496
};
var coordinates2 = {
lat: 40.805845,
lng: -74.130496
};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: coordinates,
scrollwheel: false
});
var marker = new google.maps.Marker({
position: coordinates,
map: map
});
var infoMarker = new google.maps.Marker({
position: coordinates2,
map: map
});
var infowWindow = new google.maps.InfoWindow();
var line = new google.maps.Polyline({
path: [
marker.position,
infoMarker.position
],
strokeColor: "#FF0000",
strokeOpacity: 1,
strokeWeight: 3
});
line.setMap(map);
infowWindow.setContent("<b>Hello world!</b>");
infowWindow.open(map, infoMarker);
infoMarker.setVisible(false);
}
google.maps.event.addDomListener(window, "load", initMap);
Check it working on this jsfiddle

Drawing a POLYGON from initial position

My problem is: I need to draw with mode POLYGON with a initial point, like a marker or another element. For example - JSFiddle Example
With marker:
var initialPosition = new google.maps.Marker({
position: {
lat: -22.397542,
lng: -46.884630
}
});
This position is given without any user interaction. How can I do that?
In my example, how can I draw a polygon starting from marker without click it, making marker position my first polygon point?
You could do the following: use addListenerOnce to detect a click on the map (only once). This will allow to create a Polygon that goes from your marker position, to where the user clicked, and back to the marker position.
By setting the editable property to true, you can then move each Polygon point separately, and add segments by dragging the existing segment(s) middle point(s).
Here is a working example:
function initialize() {
var myLatLng = new google.maps.LatLng(46.2, 6.17);
var mapOptions = {
zoom: 4,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
var marker = new google.maps.Marker({
position: myLatLng,
map: map
});
google.maps.event.addListenerOnce(map, 'click', function(e) {
var origin = marker.getPosition();
var coords = [
origin,
e.latLng,
origin,
];
var poly = new google.maps.Polygon({
map: map,
paths: coords,
editable: true,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
});
}
initialize();
#map-canvas {
height: 150px;
}
<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>

Cant zoom in and out of google map

I am trying to implement a google map on the site I'm working on. I copied a example from the google maps api site where you can overlay circles. The map loads fine but non of the controls work being: zooming in and out, panning the map as such. Does anyone know what may be causing this> Below is my code:
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
<script>
// This example creates circles on the map, representing
// populations in North America.
// First, create an object containing LatLng and population for each city.
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
population: 2714856
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
population: 8405837
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
population: 3857799
};
citymap['vancouver'] = {
center: new google.maps.LatLng(49.25, -123.1),
population: 603502
};
var cityCircle;
function initialize() {
// Create the map.
var mapOptions = {
zoom: 4,
center: new google.maps.LatLng(37.09024, -95.712891),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].population) * 100
};
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle(populationOptions);
}
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
Here is a link to the site where its going wrong: http://surftoursouthafrica.com/map
Your code is fine.
On your webpage you have much more stuff that interfere with the map.
Remove col-xs-12 class from the div that surrounds map-canvas and it will work:
<div class="content">
<div id="map-canvas"></div>
</div>

Google Maps Engine API - KML Layers Obstructing New Markers Event

I am currently building out a small widget that allows someone to see a kml heat map of the united states population density then select an area on that map and drop a market on to that location. The user then enters a number and that creates a mile radius to show the user how much area they cover.
My problem is that I have 63 .kml files for just one state in the US. I know I can remove the xml <name> and <description> to prevent the name from popping up when clicked, but I can't see that being practical with that many .kml files.
Is there a programmatic solution or API solution to prevent just the kml layers from being clickable?
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
value: 2714856
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
value: 8405837
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
value: 3857799
};
citymap['vancouver'] = {
center: new google.maps.LatLng(49.25, -123.1),
value: 603502
};
var cityCircle;
function initialize() {
// Create the map.
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(34.7361, -92.3311),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].value) * 100
};
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle(populationOptions);
}
var ctaLayer = new google.maps.KmlLayer({
url: 'http://www.census.gov/main/kml/countysubs_z6/AR/05003.xml'
});
ctaLayer.setMap(map);
google.maps.event.addListener(map, 'click', function(e) {
placeMarker(e.latLng, map);
});
}
function placeMarker(position, map) {
var marker = new google.maps.Marker({
position: position,
map: map
});
map.panTo(position);
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<div id="map-canvas"></div>
Discretionary note: Google API does not work well with Stack Overflow's code snippet's widget.
set the KmlLayer clickable option to false
clickable boolean If true, the layer receives mouse events. Default value is true.
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
value: 2714856
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
value: 8405837
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
value: 3857799
};
citymap['vancouver'] = {
center: new google.maps.LatLng(49.25, -123.1),
value: 603502
};
var cityCircle;
function initialize() {
// Create the map.
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(34.7361, -92.3311),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].value) * 100
};
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle(populationOptions);
}
var ctaLayer = new google.maps.KmlLayer({
url: 'http://www.census.gov/main/kml/countysubs_z6/AR/05003.xml',
clickable: false
});
ctaLayer.setMap(map);
google.maps.event.addListener(map, 'click', function(e) {
placeMarker(e.latLng, map);
});
}
function placeMarker(position, map) {
var marker = new google.maps.Marker({
position: position,
map: map
});
map.panTo(position);
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas"></div>

Categories

Resources