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D3 Variable Width Lines (copy of http://bl.ocks.org/larskotthoff/1642835, currently not working)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script> | |
| <script type="text/javascript" src="line-variable.js"></script> | |
| </head> | |
| <body> | |
| <div id="linevar"></div> | |
| <script type="text/javascript"> | |
| (function () { | |
| var dat = [{x: 20, y: 20, w: 0}, | |
| {x: 20, y: 150, w: 30}, | |
| {x: 80, y: 100, w: 20}, | |
| {x: 200, y: 100, w: 10}, | |
| {x: 300, y: 100, w: 20}, | |
| {x: 380, y: 100, w: 0}], | |
| svg = d3.select("#linevar") | |
| .append("svg:svg") | |
| .attr("height", 200) | |
| .attr("width", 400); | |
| var linevar = d3.svg.line.variable() | |
| .interpolate("basis") | |
| .w(function(d) { return d.w; }) | |
| .x(function(d) { return d.x; }) | |
| .y(function(d) { return d.y; }); | |
| svg.selectAll("path").data([dat]).enter() | |
| .append("svg:path") | |
| .attr("d", linevar); | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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| d3.svg.line.variable = function() { | |
| return d3_svg_lineVariable(); | |
| } | |
| function d3_svg_lineVariable() { | |
| var x = function(d) { return d[0]; }, | |
| y = function(d) { return d[1]; }, | |
| w = 5, | |
| intpol = "linear", | |
| t = .7; | |
| function lineVariable(d) { | |
| return d.length < 1 ? null : | |
| d3_svg_lineVariablePoints(this, d, x, y, w, intpol, t) + "Z"; | |
| } | |
| lineVariable.x = function(v) { | |
| if(!arguments.length) return x; | |
| x = v; | |
| return lineVariable; | |
| }; | |
| lineVariable.y = function(v) { | |
| if(!arguments.length) return y; | |
| y = v; | |
| return lineVariable; | |
| }; | |
| lineVariable.w = function(v) { | |
| if(!arguments.length) return w; | |
| w = v; | |
| return lineVariable; | |
| }; | |
| lineVariable.interpolate = function(v) { | |
| if (!arguments.length) return intpol; | |
| intpol = v; | |
| return lineVariable; | |
| }; | |
| lineVariable.tension = function(v) { | |
| if (!arguments.length) return t; | |
| t = v; | |
| return lineVariable; | |
| }; | |
| return lineVariable; | |
| }; | |
| function d3_svg_lineVariablePoints(self, d, x, y, w, intpol, t) { | |
| var spinePoints = [], | |
| points = [], | |
| tmpStack = [], | |
| i = -1, | |
| n = d.length, | |
| fx = typeof x === "function", | |
| fy = typeof y === "function", | |
| fw = typeof w === "function", | |
| line = d3.svg.line().interpolate(intpol).tension(t), | |
| value; | |
| if(fx && fy) { | |
| while(++i < n) spinePoints.push([ | |
| x.call(self, value = d[i], i), | |
| y.call(self, value, i) | |
| ]); | |
| } else if(fx) { | |
| while(++i < n) spinePoints.push([x.call(self, d[i], i), y]); | |
| } else if(fy) { | |
| while(++i < n) spinePoints.push([x, y.call(self, d[i], i)]); | |
| } else { | |
| while(++i < n) spinePoints.push([x, y]); | |
| } | |
| for(i = 0; i < n; i++) { | |
| var thisx = spinePoints[i][0], | |
| thisy = spinePoints[i][1], | |
| width = fw ? w.call(self, d[i], i) : w, | |
| aleft = Math.PI, aright = 0; | |
| if(i > 0) { | |
| var dx = thisx - spinePoints[i-1][0], | |
| dy = thisy - spinePoints[i-1][1]; | |
| aleft = Math.PI - Math.atan2(dy, dx); | |
| } | |
| if(i < n-1) { | |
| var dx = spinePoints[i+1][0] - thisx, | |
| dy = thisy - spinePoints[i+1][1]; | |
| aright = Math.atan2(dy, dx); | |
| } | |
| var gamma = aleft - aright, | |
| diff = width/2 / Math.sin(gamma/2), | |
| aup = aright + gamma/2, | |
| adown = aup - Math.PI, | |
| dxup = diff * Math.cos(aup), | |
| dyup = diff * Math.sin(aup), | |
| dxdown = diff * Math.cos(adown), | |
| dydown = diff * Math.sin(adown); | |
| points.push([thisx + dxup, thisy - dyup]); | |
| tmpStack.push([thisx + dxdown, thisy - dydown]); | |
| } | |
| var line0 = line(points), | |
| // change moveto to lineto as we are continuing the line | |
| line1 = line(tmpStack.reverse()).replace("M", "L"); | |
| return line0 + line1; | |
| } |
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