Text rotation in D3.js
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> | |
| <script src="http://d3js.org/d3.v2.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| /** | |
| * A convenient function for taking a transformation (with rotation) on | |
| * text and modifying it so that it always results in right-up text. | |
| * Only knows about translate and rotate. Auto-valigns the text. | |
| */ | |
| function textrotate(transform) { | |
| return function (node) { | |
| node.each(function() { | |
| var t = d3.transform(d3.functor(transform).apply(this, arguments)); | |
| node.attr("alignment-baseline", "central"); | |
| node.style("dominant-baseline", "central"); | |
| if (t.rotate <= 90 && t.rotate >= -90) { | |
| node.attr("text-anchor", "begin"); | |
| node.attr("transform", t.toString()); | |
| } else { | |
| node.attr("text-anchor", "end"); | |
| t.rotate = (t.rotate > 0 ? -1 : 1) * (180 - Math.abs(t.rotate)); | |
| node.attr("transform", t.toString()); | |
| } | |
| }); | |
| } | |
| } | |
| var w = 300, h = 300; | |
| var n = d3.select("body").insert("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .insert("g") | |
| .attr("transform","translate(" + w/2 + "," + w/2 + ")"); | |
| n.insert("circle") | |
| .attr("r", 5) | |
| .attr("cx", 0) | |
| .attr("cy", 0); | |
| n.insert("text") | |
| .text("This is some text"); | |
| function f(rot) { | |
| n.select("text").call(textrotate("rotate("+rot+")translate(12,0)")); | |
| setTimeout(function() { f(rot+1) }, 25); | |
| } | |
| f(0); | |
| </script> | |
| </body> | |
| </html> |
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