An experiment in adding a tile.transform function.
See d3/d3-tile#4.
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d3.tile Transform Experiment
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| license: gpl-3.0 |
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| // Build from commit caaa1b44268477ebcc60ad466acec35753373b8f | |
| (function (global, factory) { | |
| typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-array'), require('d3-zoom')) : | |
| typeof define === 'function' && define.amd ? define(['exports', 'd3-array', 'd3-zoom'], factory) : | |
| (factory((global.d3 = global.d3 || {}),global.d3,global.d3)); | |
| }(this, function (exports,d3Array,d3Zoom) { 'use strict'; | |
| function tile() { | |
| var x0 = 0, | |
| y0 = 0, | |
| x1 = 960, | |
| y1 = 500, | |
| tx = (x0 + x1) / 2, | |
| ty = (y0 + y1) / 2, | |
| scale = 256, | |
| zoomDelta = 0; | |
| function tile() { | |
| var z = Math.max(Math.log(scale) / Math.LN2 - 8, 0), | |
| z0 = Math.round(z + zoomDelta), | |
| k = Math.pow(2, z - z0 + 8), | |
| x = tx - scale / 2, | |
| y = ty - scale / 2, | |
| tiles = [], | |
| cols = d3Array.range(Math.max(0, Math.floor((x0 - x) / k)), Math.max(0, Math.ceil((x1 - x) / k))), | |
| rows = d3Array.range(Math.max(0, Math.floor((y0 - y) / k)), Math.max(0, Math.ceil((y1 - y) / k))); | |
| rows.forEach(function(y) { | |
| cols.forEach(function(x) { | |
| tiles.push([x, y, z0]); | |
| }); | |
| }); | |
| tiles.translate = [x / k, y / k]; | |
| tiles.scale = k; | |
| tiles.transform = d3Zoom.zoomIdentity | |
| .scale(tiles.scale) | |
| .translate(tiles.translate[0], tiles.translate[1]); | |
| return tiles; | |
| } | |
| tile.size = function(_) { | |
| return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], tile) : [x1, y1]; | |
| }; | |
| tile.extent = function(_) { | |
| return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], tile) : [[x0, y0], [x1, y1]]; | |
| }; | |
| tile.scale = function(_) { | |
| return arguments.length ? (scale = +_, tile) : scale; | |
| }; | |
| tile.translate = function(_) { | |
| return arguments.length ? (tx = +_[0], ty = +_[1], tile) : [tx, ty]; | |
| }; | |
| tile.transform = function(_) { | |
| if(arguments.length){ | |
| return tile.scale(_.k).translate([_.x, _.y]); | |
| } else { | |
| return d3Zoom.zoomIdentity.translate(tx, ty).scale(scale); | |
| } | |
| }; | |
| tile.zoomDelta = function(_) { | |
| return arguments.length ? (zoomDelta = +_, tile) : zoomDelta; | |
| }; | |
| return tile; | |
| } | |
| exports.tile = tile; | |
| Object.defineProperty(exports, '__esModule', { value: true }); | |
| })); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| path { | |
| fill: none; | |
| stroke: red; | |
| stroke-linejoin: round; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.0.0-alpha.50.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script src="d3-tile.js"></script> | |
| <script> | |
| var width = Math.max(960, window.innerWidth), | |
| height = Math.max(500, window.innerHeight); | |
| var tile = d3.tile() | |
| .size([width, height]); | |
| var projection = d3.geoMercator() | |
| .scale((1 << 12) / 2 / Math.PI) | |
| .translate([width / 2, height / 2]); | |
| var center = projection([-100, 40]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var zoom = d3.zoom() | |
| .scaleExtent([1 << 11, 1 << 14]) | |
| .on("zoom", zoomed); | |
| var initialTransform = d3.zoomIdentity | |
| .translate(width - center[0], height - center[1]) | |
| .scale(projection.scale() * 2 * Math.PI) | |
| // With the center computed, now adjust the projection such that | |
| // it uses the zoom behavior’s translate and scale. | |
| projection | |
| .scale(1 / 2 / Math.PI) | |
| .translate([0, 0]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var raster = svg.append("g"); | |
| var vector = svg.append("path"); | |
| d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json", function(error, us) { | |
| if (error) throw error; | |
| svg.call(zoom).call(zoom.transform, initialTransform); | |
| vector.attr("d", path(topojson.mesh(us, us.objects.counties))); | |
| }); | |
| function zoomed() { | |
| var transform = d3.event.transform; | |
| var tiles = tile.transform(transform)(); | |
| console.log("transform in " + transform); | |
| console.log("transform out " + tile.transform()); | |
| vector | |
| .attr("transform", transform) | |
| .style("stroke-width", 1 / transform.k); | |
| var image = raster | |
| .attr("transform", tiles.transform) | |
| .selectAll("image") | |
| .data(tiles, function(d) { return d; }); | |
| image.exit() | |
| .remove(); | |
| image.enter().append("image") | |
| .attr("xlink:href", function(d) { return "http://" + ["a", "b", "c"][Math.random() * 3 | 0] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; }) | |
| .attr("width", 1) | |
| .attr("height", 1) | |
| .attr("x", function(d) { return d[0]; }) | |
| .attr("y", function(d) { return d[1]; }); | |
| } | |
| </script> |
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