#D3.geom
Wondered what it would be like to lay all the different geometries on top of each other...
Last active
November 8, 2019 09:08
-
-
Save lsquaredleland/794a924bc3cf2ed1c401 to your computer and use it in GitHub Desktop.
Overlaying D3: hull, voronoi, voronoi.triangle, and quadtree
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> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3 Geom</title> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| </head> | |
| <body> | |
| <div id="chartArea"> | |
| </div> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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
| generate(); | |
| function generate(){ | |
| var height = window.innerHeight; | |
| var width = window.innerWidth; | |
| var svg = d3.select("#chartArea").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| coords = [] | |
| for(var i = 0; i < 50; i++){ | |
| var cy = Math.random()*(height-100) + 50 | |
| var cx = Math.random()*(width-100) + 50 | |
| coords.push([cx, cy]) | |
| } | |
| //Hull | |
| var hull = svg.append("path") | |
| .attr("class", "hull"); | |
| hull.data([d3.geom.hull(coords)]) | |
| .attr("d", function(d) { return "M" + d.join("L") + "Z"; }) | |
| .attr("opacity", .3) | |
| console.log('area', d3.geom.polygon(d3.geom.hull(coords)).area()) | |
| //Voronoi -> how to make a weighted version of this depending on the node in the center? | |
| var voronoi = d3.geom.voronoi() | |
| .clipExtent([[0, 0], [width, height]]); | |
| //voronoi.triangles seems very similar to the outside of a hull? | |
| var path = svg.append("g").selectAll("path"); | |
| path = path.data(voronoi.triangles(coords), polygon); | |
| path.enter().append("path") | |
| .attr("class", function(d, i) { return "q" + (i % 9) + "-9" + " voronoiTriangles"; }) | |
| .attr("fill", 'none') | |
| .attr("stroke", "maroon") | |
| .attr("d", polygon) | |
| .on('mouseover', function() { | |
| d3.selectAll('.voronoiTriangles').style('stroke-width', 3) | |
| }) | |
| .on('mouseout', function() { | |
| d3.selectAll('.voronoiTriangles').style('stroke-width', 1) | |
| }) | |
| function polygon(d) { | |
| return "M" + d.join("L") + "Z"; | |
| } | |
| //Voronoi | |
| path = path.data(voronoi(coords), polygon); | |
| path.enter().append("path") | |
| .attr("class", function(d, i) { return "q" + (i % 9) + "-9" + " voronoi"; }) | |
| .attr("fill", 'none') | |
| .attr("stroke", "#3CA1A5") | |
| .attr("d", polygon) | |
| .on('mouseover', function() { | |
| d3.selectAll('.voronoi').style('stroke-width', 3) | |
| }) | |
| .on('mouseout', function() { | |
| d3.selectAll('.voronoi').style('stroke-width', 1) | |
| }) | |
| //QuadTrees | |
| var quadtree = d3.geom.quadtree() | |
| .extent([[0, 0], [width, height]]); | |
| var rect = svg.selectAll(".node") | |
| .data(nodes(quadtree(coords))) | |
| .enter().append("rect") | |
| .attr("class", "node quadTrees") | |
| .attr("fill", 'none') | |
| .attr("stroke", "#7D9B47") | |
| .attr("x", function(d) { return d.x1; }) | |
| .attr("y", function(d) { return d.y1; }) | |
| .attr("width", function(d) { return d.x2 - d.x1; }) | |
| .attr("height", function(d) { return d.y2 - d.y1; }) | |
| .on('mouseover', function() { | |
| d3.selectAll('.quadTrees').style('stroke-width', 3) | |
| }) | |
| .on('mouseout', function() { | |
| d3.selectAll('.quadTrees').style('stroke-width', 1) | |
| }) | |
| function nodes(quadtree) { | |
| var nodes = []; | |
| quadtree.depth = 0; // root | |
| quadtree.visit(function(node, x1, y1, x2, y2) { | |
| node.x1 = x1; | |
| node.y1 = y1; | |
| node.x2 = x2; | |
| node.y2 = y2; | |
| nodes.push(node); | |
| for (var i=0; i<4; i++) { | |
| if (node.nodes[i]) node.nodes[i].depth = node.depth+1; | |
| } | |
| }); | |
| return nodes; | |
| } | |
| //Circles | |
| svg.selectAll('circle') | |
| .data(coords).enter().append('circle') | |
| .classed('circle', true) | |
| .attr('cx', function(d) { return d[0]; }) | |
| .attr('cy', function(d) { return d[1]; }) | |
| .attr('r', 5) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment