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rolux 2012-05-30 13:34:57 +02:00
commit 9269b96469
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examples/manhattan_grid/js/example.js
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@ -1,8 +1,9 @@
/*
The idea (a slight variation of a proposal by
<a href="http://extendny.com/">Harold Cooper</a>) is to extend the Manhattan
Grid in all directions, so that every point on Earth can be addressed as
"Xth Ave & Yth St".<br><br>
The idea (a slight variation of a proposal by [Harold
Cooper](http://extendny.com/)) is to extend the Manhattan Grid in all
directions, so that every point on Earth can be addressed as "Xth Ave & Yth
St".
The origin of this coordinate system is the intersection of Zero Ave (a.k.a.
Avenue A) and Zero St (a.k.a. Houston St). Avenues east of Zero Ave, just as
Streets south of Zero St, have negative numbers. Broadway, which will split not
@ -11,7 +12,8 @@ retains its orientation, but is adjusted slightly so that it originates at the
intersection of Zero & Zero. From there, Broadway, Zero Avenue and Zero Street
continue as perfectly straight equatorial lines. All three will intersect once
more, exactly halfway, in the Indian Ocean, (southwest of Australia), at the
point furthest from Manhattan.<br><br>
point furthest from Manhattan.
As subsequent avenues remain exactly parallel to Zero Ave, and subsequent
streets exactly parallel to Zero St, they form smaller and smaller circles
around the globe. The northernmost and southernmost streets are small circles
@ -144,7 +146,7 @@ Ox.load('Image', function() {
east: Ox.getPoint(points['0 & 0'], -C / 4, bearings.streets),
/*
Broadway has two poles as well, and constructing them will make drawing
easier. Ox.mod is the modulo function. Unlike <code>-90 % 360</code>,
easier. Ox.mod is the modulo function. Unlike `-90 % 360`,
which in JavaScript is -90, Ox.mod(-90, 360) returns 270.
*/
westBroadway: Ox.getPoint(
@ -162,7 +164,7 @@ Ox.load('Image', function() {
Now we calculate circles for Broadway, Avenues and Streets. Ox.getCircle
returns an array of lat/lng pairs that form a circle around a given point,
with a given radius and a given precision, so that the circle will have
<code>Math.pow(2, precision)</code> segments.
`Math.pow(2, precision)` segments.
*/
lines = {
/*
@ -209,10 +211,10 @@ Ox.load('Image', function() {
/*
Before we start drawing, we define a few helper functions.
<code>getXYByLatLng</code> returns screen coordinates for a given point.
`getXYByLatLng` returns screen coordinates for a given point.
We use Ox.getXYByLatLng, which takes a lat/lng pair and returns its x/y
position on a 1×1 Mercator position, with <code>{x: 0, y: 0}</code> at the
bottom left and <code>{x: 1, y: 1}</code> at the top right.
position on a 1×1 Mercator position, with `{x: 0, y: 0}` at the
bottom left and `{x: 1, y: 1}` at the top right.
*/
function getXYByLatLng(point) {
return Ox.map(Ox.getXYByLatLng(point), function(v) {
@ -221,7 +223,7 @@ Ox.load('Image', function() {
}
/*
<code>getLatLngByXY</code> is the inverse of the above, just like
`getLatLngByXY` is the inverse of the above, just like
Ox.getLatLngByXY.
*/
function getLatLngByXY(xy) {
@ -231,7 +233,7 @@ Ox.load('Image', function() {
}
/*
<code>getASByLatLng</code> takes lat/lng and returns avenue/street. To
`getASByLatLng` takes lat/lng and returns avenue/street. To
compute the avenue, we subtract the point's distance from the West Pole, in
avenues, from the total number of avenues. To compute the street, we
subtract the point's distance from the North Pole, in avenues, from the
@ -260,7 +262,7 @@ Ox.load('Image', function() {
}
/*
<code>getASByXY</code> returns avenue and street at the given screen
`getASByXY` returns avenue and street at the given screen
coordinates.
*/
function getASByXY(xy) {
@ -268,7 +270,7 @@ Ox.load('Image', function() {
}
/*
<code>drawPath</code> draws a path of lat/lng pairs on an image. For each
`drawPath` draws a path of lat/lng pairs on an image. For each
path segment, we have to check if it crosses the eastern or western edge of
the map that splits the Pacific Ocean. Note that our test (a segment
crosses the edge if it spans more than 180 degrees longitude) is obviously