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POGoogle Maps Flash - Polygon with Holes, Crossing the meridian
 

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  1. POGoogle Maps Flash - Polygon with Holes, Crossing the meridian
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    <p>I have a problem with creating an overlay with a polygon that contains multiple polylines.</p> <p>I want to create a polygon with holes cut out for certain countries (to show which areas are off limits). I do this by creating a polygone with multiple polylines. The first polyline was created to cover the entire visible area of the map.</p> <p>i started off with this:</p> <p>To get around only spanning one region-180/180</p> <pre><code> var outer:Array = [ new LatLng(90, -180), new LatLng(90, 180), new LatLng(-90, 180), new LatLng(-90, -180), new LatLng(90, -180)] donut = new Polygon([], new PolygonOptions({ strokeStyle: new StrokeStyle({ thickness: 0}), fillStyle: new FillStyle({ color: 0x000000, alpha: 0.5}) })); donut.setPolyline(0, outer) map.addOverlay(donut); </code></pre> <p>Obviously this has a problem with only spanning one lot of lat/lng. And when zoomed out, this doesnt work. To get around this i tried getting the bounds of the map, toSpan() and getNorth(),getSouth() and so on. These didnt return a true span of the visible map - as it maxed out at 180/360.</p> <p>My solution was to use fromViewportToLatLng() of the pixel points of the map, and set the opt_nowrap to 'true'</p> <pre><code> var pnw:LatLng = map.fromViewportToLatLng(new Point(0, 0), true) var pse:LatLng = map.fromViewportToLatLng(new Point(map.width, map.height), true) </code></pre> <p>This produced results similar to this</p> <pre><code> Lat Lng North West (89.77386689378173, -614.3294000000001) LatLng South East (-89.07253945829217, 370.0455999999999) </code></pre> <p>From here i can then correctly set the polyline (on map move and zoom events) to cover the entire map, no matter how many spans of longitude occur:</p> <pre><code> outer = [ new LatLng(pnw.lat(), pnw.lng(), true), new LatLng(pnw.lat(), pse.lng(), true), new LatLng(pse.lat(), pse.lng(), true), new LatLng(pse.lat(), pnw.lng(), true), new LatLng(pnw.lat(), pnw.lng(), true) ] donut.setPolyline(0, outer) </code></pre> <p>*So far so good. * Now, i want to add the donut holes to my polygon, again adding polylines to the donut polygon.</p> <pre><code> private var australia:Array = [ new LatLng(-9.7716, 143.0241), new LatLng(-23.4610, 158.1852), new LatLng(-45.1338, 147.1549), new LatLng(-35.2615, 111.5153), new LatLng(-20.6921, 113.0094), new LatLng(-10.0746, 130.3239), new LatLng(-9.7716, 143.0241) ] private var nz:Array = [ new LatLng(-33.5951, 165.8254), new LatLng(-33.5951, 179.7341), new LatLng(-48.3845, 179.7341), new LatLng(-48.3845, 165.8254), new LatLng(-33.5951, 165.8254) ] private var hawaii:Array = [ new LatLng(21.8000, -160.4347), new LatLng(22.5477, -159.7975), new LatLng(21.4067, -156.3533), new LatLng(19.5336, -154.4197), new LatLng(18.6511, -155.6392), new LatLng(20.6633, -157.8639), new LatLng(21.8000, -160.4347) ] donut.setPolyline(1, hawaii) donut.setPolyline(2, nz) donut.setPolyline(3, australia) </code></pre> <p>The problem lies when the meridian line is visible in the map viewport. This problem is more evident when zommed in, as the donut hole polylines jump<br> from the visible viewport to the other side of a lat long span.</p> <p>Sometimes the outer array doesnt even correctly render, causing the donut polygon to essentialy invert (polygons over the countries, rather than cutouts)</p> <p>I realise this is a tough one to visualise. I have attached the .as + .fla file in case anyone wants to test it out.</p> <p><a href="http://www.digital.leskiwis.com/maps/MapTest.zip" rel="nofollow">http://www.digital.leskiwis.com/maps/MapTest.zip</a> </p>
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