Adapted from http://bl.ocks.org/mbostock/4707858
Built with blockbuilder.org
Last active
February 13, 2017 21:33
-
-
Save jonsadka/c1f75dfceeac5947da9b316469753b16 to your computer and use it in GitHub Desktop.
TopoJSON Map of Los Angeles
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| path { | |
| stroke: gray; | |
| fill: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| const width = 960; | |
| const height = 960; | |
| const svg = d3.select('body').append('svg') | |
| .attr('height', width) | |
| .attr('width', height); | |
| d3.queue() | |
| .defer(d3.json, 'la.json') | |
| .await(render) | |
| function render(error, la) { | |
| if (error) return console.warn(error); | |
| // Create a unit projection. | |
| const laProjection = d3.geoAlbers() | |
| .scale(1) | |
| .translate([0, 0]); | |
| // Create a path generator | |
| const path = d3.geoPath() | |
| .projection(laProjection); | |
| // Compute the bounds of a feature of interest, | |
| // then derive scale & translate. | |
| const laBounds = path.bounds(la); | |
| const laScale = 0.95 / Math.max( | |
| (laBounds[1][0] - laBounds[0][0]) / width, | |
| (laBounds[1][1] - laBounds[0][1]) / height | |
| ); | |
| const laTranslate = [ | |
| (width - laScale * (laBounds[1][0] + laBounds[0][0])) / 2, | |
| (height - laScale * (laBounds[1][1] + laBounds[0][1])) / 2 | |
| ]; | |
| // Update the projection to use computed scale & translate. | |
| console.log(laBounds); | |
| console.log(laScale, laTranslate) | |
| laProjection.scale(laScale) | |
| .translate(laTranslate); | |
| svg.append('path') | |
| .datum(la) | |
| .attr('d', path); | |
| } | |
| </script> | |
| </body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment