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@erlenstar

erlenstar/.block

Last active July 21, 2017 22:44
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fresh block
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.block
license: mit
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index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<title>simple open location code builder</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body {
}
table {
background: #dedede;
border-spacing: 1px;
border-collapse: separate;
margin: 20px;
}
table tr td {
background: #fff;
color: #999;
font: 9px monospace;
height: 20px;
text-align: center;
width: 20px;
}
</style>
</head>
<body>
<h3>literate pluscodes (OLC) guide</h3>
<p>
in this block we walk through the construction of an Open Location Code / pluscode, using just geometry
</p>
<div class="group">
<table class="four"></table>
<aside>top level</aside>
</div>
<div class="group">
<table class="four"></table>
<aside>zoom one</aside>
</div>
<div class="group">
<table class="four"></table>
<aside>zoom two</aside>
</div>
<div class="group">
<table class="four"></table>
<aside>zoom three</aside>
</div>
<div class="group">
<table class="four"></table>
<aside>zoom four</aside>
</div>
<div class="group">
<table class="twenty"></table>
<aside>final detail</aside>
</div>
<footer></footer>
<script>
// 20 row and column keys
let keys = ('23456789CFGHJMPQRVWX').split('')
// default selected grid for each level
let defaultGrid = '22'
// array to track the currently selected
let pluscode = ['22','22','22','22','22','2']
// plus code delimiter
let plusDelim = '+'
// height and width for grids
let height = 400
let width = 400
let itemWidth = height / keys.length
// the table way
// setup the 20x20 grids
let tables = d3.selectAll("table.four")
tables.selectAll("tr")
.data(keys)
.enter().append("tr")
.selectAll("td")
.data(keys)
.enter().append("td")
.text(function(d, i) {
return d3.select(this.parentNode).datum() + d
})
// setup the 4x5 grid
let detailGrids = d3.selectAll("table.twenty")
detailGrids.selectAll("tr")
.data(d3.range(0, 20, 4))
.enter().append("tr")
.selectAll("td")
.data(d3.range(0, 4))
.enter().append("td")
.text(function(d, i) {
let index = d3.select(this.parentNode).datum() + d;
return keys[index]
})
// select grid items based on the current pluscode
// update the display
// keysToPluscode : Array(String) -> String -> String
function keysToPluscode(keys, delim) {
return keys.slice(0, 4).join() + delim + keys.slice(4).join()
}
// pluscodeToLatLon : String -> Obj { lat: Float, lon: Float }
function pluscodeToLatLon(code) {
}
</script>
</body>
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