Created
February 11, 2012 23:26
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Regular polygon generator written with d3
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Polygon</title> | |
| </head> | |
| <body> | |
| <section> | |
| <form onsubmit='return false'> | |
| <label>Number of edges: <input type=number min=3 value=5 /></label> | |
| <label><input type=checkbox /> Show vertices</label> | |
| <br> | |
| <label>Radius: <input type=range min=10 max=400 value=300 /></label> | |
| </form> | |
| </section> | |
| <script src='http://mbostock.github.com/d3/d3.js'></script> | |
| <script src='poly.js'></script> | |
| </body> | |
| </html> |
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| # Polygons! | |
| RADIUS = 400 | |
| svg = d3.select('section').append 'svg:svg' | |
| svg.attr('width', RADIUS * 2).attr('height', RADIUS * 2) | |
| g = svg.append('g').attr('transform', "translate(#{RADIUS} #{RADIUS})") | |
| edges = document.querySelector('input[type=number]') | |
| radius = document.querySelector('input[type=range]') | |
| vertices = document.querySelector('input[type=checkbox]') | |
| d3.selectAll('input').on 'change', -> update() | |
| update = -> | |
| n = edges.value | |
| r = radius.value | |
| x = r | |
| y = 0 | |
| data = for i in [1..n] | |
| alpha = i * 2 * Math.PI / n | |
| px = x | |
| py = y | |
| x = r * Math.cos(alpha) | |
| y = r * Math.sin(alpha) | |
| {x: x, y: y, px: px, py: py} | |
| points = g.selectAll('circle').data(data) | |
| points.enter().append('svg:circle') | |
| .attr('r', 3) | |
| .attr('cx', (d) -> d.x) | |
| .attr('cy', (d) -> d.y) | |
| .attr('opacity', -> if vertices.checked then 1 else 0) | |
| points.transition() | |
| .attr('cx', (d) -> d.x) | |
| .attr('cy', (d) -> d.y) | |
| .attr('opacity', -> if vertices.checked then 1 else 0) | |
| points.exit().remove() | |
| lpos = (sel) -> | |
| sel | |
| .attr('x1', (d) -> d.px) | |
| .attr('y1', (d) -> d.py) | |
| .attr('x2', (d) -> d.x) | |
| .attr('y2', (d) -> d.y) | |
| de = g.selectAll('line').data(data) | |
| de.enter() | |
| .append('svg:line') | |
| .attr('stroke', 'black') | |
| .attr('stroke-width', 2) | |
| .call(lpos) | |
| de.transition() | |
| .call(lpos) | |
| de.exit() | |
| .remove() | |
| update() |
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| (function() { | |
| var RADIUS, edges, g, radius, svg, update, vertices; | |
| RADIUS = 400; | |
| svg = d3.select('section').append('svg:svg'); | |
| svg.attr('width', RADIUS * 2).attr('height', RADIUS * 2); | |
| g = svg.append('g').attr('transform', "translate(" + RADIUS + " " + RADIUS + ")"); | |
| edges = document.querySelector('input[type=number]'); | |
| radius = document.querySelector('input[type=range]'); | |
| vertices = document.querySelector('input[type=checkbox]'); | |
| d3.selectAll('input').on('change', function() { | |
| return update(); | |
| }); | |
| update = function() { | |
| var alpha, data, de, i, lpos, n, points, px, py, r, x, y; | |
| n = edges.value; | |
| r = radius.value; | |
| x = r; | |
| y = 0; | |
| data = (function() { | |
| var _results; | |
| _results = []; | |
| for (i = 1; 1 <= n ? i <= n : i >= n; 1 <= n ? i++ : i--) { | |
| alpha = i * 2 * Math.PI / n; | |
| px = x; | |
| py = y; | |
| x = r * Math.cos(alpha); | |
| y = r * Math.sin(alpha); | |
| _results.push({ | |
| x: x, | |
| y: y, | |
| px: px, | |
| py: py | |
| }); | |
| } | |
| return _results; | |
| })(); | |
| points = g.selectAll('circle').data(data); | |
| points.enter().append('svg:circle').attr('r', 3).attr('cx', function(d) { | |
| return d.x; | |
| }).attr('cy', function(d) { | |
| return d.y; | |
| }).attr('opacity', function() { | |
| if (vertices.checked) { | |
| return 1; | |
| } else { | |
| return 0; | |
| } | |
| }); | |
| points.transition().attr('cx', function(d) { | |
| return d.x; | |
| }).attr('cy', function(d) { | |
| return d.y; | |
| }).attr('opacity', function() { | |
| if (vertices.checked) { | |
| return 1; | |
| } else { | |
| return 0; | |
| } | |
| }); | |
| points.exit().remove(); | |
| lpos = function(sel) { | |
| return sel.attr('x1', function(d) { | |
| return d.px; | |
| }).attr('y1', function(d) { | |
| return d.py; | |
| }).attr('x2', function(d) { | |
| return d.x; | |
| }).attr('y2', function(d) { | |
| return d.y; | |
| }); | |
| }; | |
| de = g.selectAll('line').data(data); | |
| de.enter().append('svg:line').attr('stroke', 'black').attr('stroke-width', 2).call(lpos); | |
| de.transition().call(lpos); | |
| return de.exit().remove(); | |
| }; | |
| update(); | |
| }).call(this); |
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