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d3.mapzoom.js
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d3.mapzoom.js
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d3.mapzoom = function() {
var center = [0,0]
var scale = 10000
var projection = undefined,
zoom = undefined,
tile = undefined
var layers = []
function map(svg) {
projection = d3.geo.mercator()
.center(center)
.scale(scale)
zoom = d3.behavior.zoom()
.translate(projection([0,0]))
.scale(projection.scale() * 2 * Math.PI)
.on("zoom", redraw)
zoom(svg)
}
function redraw() {
projection.scale(zoom.scale() / (2 * Math.PI));
var c = projection.center(), t = projection.invert(zoom.translate())
var i = c[0] - t[0]
var j = c[1] - t[1]
projection.center([i, j])
layers.forEach(function(layer) {
layer();
});
}
map.center = function(_) {
if (!arguments.length)
return center;
else {
center = _;
}
return map;
}
map.scale = function(_) {
if (!arguments.length)
return scale;
else {
scale = _;
}
return map;
}
map.projection = function(_) {
if (!arguments.length)
return projection;
else
projection = _;
return map;
}
map.zoom = function(_) {
if (!arguments.length)
return zoom;
else
zoom = _;
return map;
}
map.tile = function(_) {
if (!arguments.length)
return tile;
else
tile = _;
return map;
}
map.layers = function(_) {
if (!arguments.length)
return layers;
else
laters = _;
return map;
}
map.addLayer = function(_) {
layers.push(_)
redraw()
}
map.addTileLayer = function(frame, url, prefixes) {
var tile = d3.geo.tile()
.zoomDelta((window.devicePixelRatio || 1) - .5)
function draw() {
var tiles = tile
.scale(zoom.scale())
.translate(zoom.translate())()
frame.selectAll('*').remove()
frame
.selectAll("image")
.data(tiles)
.enter().append("image")
.attr("xlink:href", function(d) { return "http://" + prefixes[Math.random() * prefixes.length | 0] + "." + url + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
.attr("width", Math.round(tiles.scale))
.attr("height", Math.round(tiles.scale))
.attr("x", function(d) { return Math.round((d[0] + tiles.translate[0]) * tiles.scale); })
.attr("y", function(d) { return Math.round((d[1] + tiles.translate[1]) * tiles.scale); })
}
layers.push(draw)
redraw()
}
map.addEraseCanvas = function(canvas) {
var ctx = canvas.getContext('2d')
var erase = function() {
ctx.clearRect(0, 0, canvas.width, canvas.height)
}
layers.unshift(erase) // add at beginning
}
map.addCanvasTileLayer = function(canvas, url, prefixes) {
var tile = d3.geo.tile()
.zoomDelta((window.devicePixelRatio || 1) - .5)
var ctx = canvas.getContext('2d')
function draw() {
var tiles = tile
.scale(zoom.scale())
.translate(zoom.translate())()
tiles.forEach(function(d, i) {
if (! d.img) {
d.img = new Image()
d.img.onload = function() {
var x = Math.round((d[0] + tiles.translate[0]) * tiles.scale);
var y = Math.round((d[1] + tiles.translate[1]) * tiles.scale);
var length = Math.round(tiles.scale)
ctx.drawImage(d.img, x, y, length, length);
}
}
d.img.src = "http://" + prefixes[Math.random() * prefixes.length | 0] + "." + url + d[2] + "/" + d[0] + "/" + d[1] + ".png";
});
}
layers.push(draw);
}
return map
}