Created
August 29, 2011 23:02
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Drag Axis
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| Click on the x axis line and drag to change the scale of the graph. |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> | |
| <title>bar</title> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script> | |
| <style type="text/css"> | |
| #chart { | |
| font-size: 12px; | |
| } | |
| #chart line.data { | |
| stroke: steelblue; | |
| stroke-width: 6px; | |
| } | |
| #chart .xaxis { | |
| stroke: black; | |
| stroke-width: 6px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript"> | |
| var w = 960, | |
| h = 320, | |
| m = [ 15, 5, 15, 5 ], // top, right, bottom, left (ala css) | |
| mw = w - m[1] - m[3], | |
| mh = h - m[0] - m[2], | |
| data = [ { x: 1, y: 10 }, { x: 3, y: 12 }, { x: 4, y: 14 }, { x: 9, y: 16 } ]; | |
| var x = d3.scale.linear() | |
| .domain([d3.min(data, function(d) { return d.x; }), d3.max(data, function(d) { return d.x; })]) | |
| .range([0, mw]), | |
| y = d3.scale.linear() | |
| .domain([Math.min(0, d3.min(data, function(d) { return d.y; })), d3.max(data, function(d) { return d.y; })]) | |
| .range([0, mh]); | |
| var vis = d3.select("#chart") | |
| .append("svg:svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .attr("pointer-events", "all") | |
| .append("svg:g") | |
| .attr("transform", "translate(" + m[3] + "," + m[0] + ")"); | |
| draw(); | |
| function draw() { | |
| var lines = vis.selectAll("line.data") | |
| .data(data); | |
| lines.exit().remove(); | |
| lines.enter() | |
| .append("svg:line") | |
| .attr("class", "data"); | |
| lines | |
| .attr("x1", function(d) { return x(d.x); }) | |
| .attr("x2", function(d) { return x(d.x); }) | |
| .attr("y1", function(d) { return mh - y(0); }) | |
| .attr("y2", function(d) { return mh - y(d.y); }); | |
| } | |
| // drag x-axis logic | |
| var downx = Math.NaN; | |
| var downscalex; | |
| // attach the mousedown to the line | |
| vis.append("svg:line") | |
| .attr("class", "xaxis") | |
| .attr("x1", 0) | |
| .attr("x2", mw) | |
| .attr("y1", mh - y(0)) | |
| .attr("y2", mh - y(0)) | |
| .on("mousedown", function(d) { | |
| var p = d3.svg.mouse(vis[0][0]); | |
| downx = x.invert(p[0]); | |
| downscalex = x; | |
| }); | |
| // attach the mousemove and mouseup to the body | |
| // in case one wonders off the axis line | |
| d3.select('body') | |
| .on("mousemove", function(d) { | |
| if (!isNaN(downx)) { | |
| var p = d3.svg.mouse(vis[0][0]), rupx = p[0]; | |
| if (rupx != 0) { | |
| x.domain([downscalex.domain()[0], mw * (downx - downscalex.domain()[0]) / rupx + downscalex.domain()[0]]); | |
| } | |
| draw(); | |
| } | |
| }) | |
| .on("mouseup", function(d) { | |
| downx = Math.NaN; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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