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May 10, 2016 23:40
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <style> | |
| .axis { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <head> | |
| <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <meta charset="UTF-8"> | |
| <title>Title</title> | |
| </head> | |
| <body> | |
| <div id="vis"></div> | |
| <script> | |
| var height = 300, | |
| width = 500, | |
| padding = { top: 20, left: 20, right: 20, bottom: 20}, | |
| xScale = d3.scale.ordinal(), | |
| yScale = d3.scale.linear(), | |
| svg = d3.select("#vis").append("svg").attr("width", width).attr("height", height), | |
| color = d3.scale.category10(), | |
| xAxis = d3.svg.axis(), | |
| data = [ | |
| { category: "A", value: 50 }, | |
| { category: "B", value: 30 }, | |
| { category: "C", value: 20 }, | |
| { category: "D", value: 20 }, | |
| ], | |
| drag = d3.behavior.drag() | |
| .on("dragstart", function(){ | |
| var bar = d3.select(this), | |
| mouseX = d3.mouse(this)[0], | |
| barX = +bar.attr("x"); | |
| /* Keep at which x coordinate the bar is drawn when the dragging starts */ | |
| bar.property("startX", barX) | |
| /* Since x of the bar starts at the top-left corner of the rect, | |
| Here, calculate how much the x of the current bar is apart from the x of the mouse */ | |
| bar.property("xDiff", mouseX - barX); | |
| /* Bring the bar to the front */ | |
| bar.node().parentNode.appendChild(bar.node()); | |
| }) | |
| .on("drag", function(){ | |
| var curBar = d3.select(this), | |
| curIdx = data.indexOf(curBar.datum()), | |
| startX = curBar.property("startX"), | |
| mouseX = d3.mouse(this)[0], | |
| newX = mouseX - curBar.property("xDiff"), | |
| xRange = (xScale.range()[1] - xScale.range()[0]) / 2, | |
| backlash = xScale.rangeBand() / 2.5, | |
| nearestBar, nearestIdx, nearestX; | |
| if (newX < xScale.range()[0] - backlash | |
| || xScale.range()[data.length - 1] + backlash < newX) | |
| return; | |
| curBar.attr("x", newX); | |
| /* Get the index of the nearest bar */ | |
| if (curIdx == 0) | |
| nearestIdx = 1; | |
| else if (newX < startX || curIdx == data.length - 1) | |
| nearestIdx = curIdx - 1; | |
| else | |
| nearestIdx = curIdx + 1; | |
| nearestBar = d3.selectAll(".bar").filter(function(d) { return d == data[nearestIdx]; }); | |
| nearestX = +nearestBar.attr("x"); | |
| /* If the current bar is moved close enough to the nearest bar, | |
| then update the order of the data array. For example, if we are dragging | |
| the first bar and moving to right, the order will be [a, b, c] to [b, a, c] */ | |
| if (startX + xRange < newX || newX < startX - xRange) { | |
| var tmp = data[curIdx]; | |
| data[curIdx] = data[nearestIdx]; | |
| data[nearestIdx] = tmp; | |
| curBar.property("startX", nearestX); | |
| xScale.domain(data.map(function(d){ return d.category; })); | |
| d3.select(".x.axis").transition().duration(200).call(xAxis.scale(xScale)); | |
| nearestBar.transition().duration(100).attr("x", xScale(nearestBar.datum().category)); | |
| } | |
| }) | |
| .on("dragend", function(){ | |
| var bar = d3.select(this); | |
| bar.transition().duration(300).attr("x", xScale(bar.datum().category)); | |
| }); | |
| xScale.domain(data.map(function(d){ return d.category; })) | |
| .rangeRoundBands([ padding.left, width - padding.right], 0.3); | |
| yScale.domain([0, d3.max(data, function(d) { return d.value; })]) | |
| .range([height - padding.bottom, padding.top]); | |
| xAxis.scale(xScale).orient("bottom"); | |
| svg.selectAll("rect").data(data).enter() | |
| .append("rect").attr("width", xScale.rangeBand()) | |
| .attr("height", function(d) { return height - padding.bottom - yScale(d.value)}) | |
| .attr("x", function(d) { return xScale(d.category); }) | |
| .attr("y", function(d) { return yScale(d.value); }) | |
| .attr("fill", function(d,i) { return color(i); }) | |
| .attr("class", "bar") | |
| .call(drag); | |
| svg.append("g") | |
| .attr("transform", "translate(" + 0 + "," + (height - padding.bottom) + ")") | |
| .attr("class", "x axis") | |
| .call(xAxis); | |
| </script> | |
| </body> | |
| </html> |
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Demo is available here: https://bl.ocks.org/Lulkafe/097a34f373cfe70f3acec3f4c5c69f34