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Bar Chart Transitions - Positive to Negative
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| </style> | |
| <body> | |
| <button onClick="flip1();">Flip - Single Transition, Cubic-In-Out</button> | |
| <button onClick="flip2();">Flip - Double Transition, Cubic-Out, Cubic-In</button> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var data = [5, 3, 7, 2, 9, 6, 12, 8, 10, 11], | |
| w = 900, // width | |
| h = 600, // height | |
| m = 20, // margin | |
| t = 1000, // transition time | |
| b = w / data.length // block width | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", w + 2 * m) | |
| .attr("height", h + 2 * m) | |
| .append("g") | |
| .attr("transform", "translate(" + m + "," + m + ")"); | |
| svg.append("line") | |
| .style("stroke", "black") | |
| .attr("x1", 0) | |
| .attr("x2", w) | |
| .attr("y1", h / 2) | |
| .attr("y2", h / 2) | |
| var redraw = function(data, easeType){ | |
| var bars = svg.selectAll("rect") | |
| .data(data) | |
| bars.enter().append("rect") | |
| .attr("fill", "steelblue") | |
| .attr("x", function(d, i){ return i * b + 5; }) | |
| .attr("width", b - 10) | |
| .attr("y", h / 2) | |
| .attr("height", 0); | |
| if(easeType == "double"){ | |
| // make two transitions: | |
| // 1. transition the bar heights to zero using half of the transition time | |
| // 2. transition the bar heigths to their new height using the remaining time | |
| bars.transition().duration(t / 2).ease("cubic-in") | |
| .attr("y", h / 2) | |
| .attr("height", 0) | |
| .transition().duration(t / 2).ease("cubic-out") | |
| .attr("y", function(d){ return Math.min(h / 2, h / 2 - 10 * d); }) | |
| .attr("height", function(d){ return Math.abs(10 * d); }); | |
| } else { | |
| // the "default" transition--just update the attributes at once | |
| // this gives a funny result--the bars never get to zero, | |
| // but rather "float" over the axis. | |
| bars.transition().duration(t) | |
| .attr("y", function(d){ return Math.min(h / 2, h / 2 - 10 * d); }) | |
| .attr("height", function(d){ return Math.abs(10 * d); }); | |
| } | |
| } | |
| redraw(data); | |
| var flip1 = function(){ | |
| data = data.map(function(d){ return -d; }); | |
| redraw(data, "single"); | |
| } | |
| var flip2 = function(){ | |
| data = data.map(function(d){ return -d; }); | |
| redraw(data, "double"); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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