Hi all,
I have been studying Google Maps Javascript API v.2 and Mike's
tutorial page (econym.org.uk/gmap/) has been very very helpful.
While I followed his Euclidean projection source code (econym.org.uk/
gmap/example_custommapflat.htm), I got a question which I cannot
solve. This may be because of my poor knowledge about coordinate
systems. I would be very grateful if anyone could give me an aid.
In his code (sorry, I used Google Chrome's "view-source" option to
read the code) to draw Euclidean map with markers and a polyline, Mike
created the Euclidean Map Type first. Then, when drawing the marker
overlay, he wrote as follows:
var points=[];
for (var i=-85; i<85; i+=7) {
var P = new GLatLng(i, i*2);
map.addOverlay(new GMarker(P));
points.push(P);
}
map.addOverlay(new GPolyline(points, "#FF0000", null, 1));
The part I cannot understand is "var P = new GLatLng(i, i*2);". Could
anyone please teach me why we have to set the longitude twice the size
of latitude to draw 45 degree line?
Thank you so much in advance.
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