Part of a series of examples. See:
Last active
March 13, 2024 22:46
-
-
Save mbostock/2206340 to your computer and use it in GitHub Desktop.
mousewheel-zoom + click-to-center
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: gpl-3.0 |
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> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| #states { | |
| fill: #aaa; | |
| } | |
| #state-borders { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.albersUsa() | |
| .scale(1070) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var zoom = d3.behavior.zoom() | |
| .translate(projection.translate()) | |
| .scale(projection.scale()) | |
| .scaleExtent([height, 8 * height]) | |
| .on("zoom", zoomed); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var g = svg.append("g") | |
| .call(zoom); | |
| g.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| g.append("g") | |
| .attr("id", "states") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .on("click", clicked); | |
| g.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("id", "state-borders") | |
| .attr("d", path); | |
| }); | |
| function clicked(d) { | |
| var centroid = path.centroid(d), | |
| translate = projection.translate(); | |
| projection.translate([ | |
| translate[0] - centroid[0] + width / 2, | |
| translate[1] - centroid[1] + height / 2 | |
| ]); | |
| zoom.translate(projection.translate()); | |
| g.selectAll("path").transition() | |
| .duration(700) | |
| .attr("d", path); | |
| } | |
| function zoomed() { | |
| projection.translate(d3.event.translate).scale(d3.event.scale); | |
| g.selectAll("path").attr("d", path); | |
| } | |
| </script> |
Hi,
i would like t disable scroll wheel and wheel zoom but maintain a slider zoom.
Is it possible? can you explain how?
thanks
this is really great. Awesome job, @mbostock. I was curious if you knew how we could add data points (city markers etc) to this map, that stay in their "proper" location regardless of zoom level?
Hi,
Are there v4 version of these tutorials available somewhere?
👍
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Here's an example of a "rolling" Mercator projection with pan and zoom that uses wraparound and absolute latitude clamping to keep everything in the viewport: https://gist.github.com/patricksurry/6621971