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bar chart data binding
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| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", 800) | |
| .attr("height", 600) | |
| .attr("transform", "translate(10, 300)") | |
| var max = 100, n = 100; | |
| var data = []; | |
| function generate_data(n) { | |
| data = d3.range(n).map(function(d) { return Math.random() * max}) ; | |
| } | |
| generate_data(n); | |
| var x = d3.scaleBand() | |
| .domain(d3.range(n)) | |
| .range([0, 400]) | |
| var y = d3.scaleLinear() | |
| .domain([0 , d3.max(data)]) | |
| .range([0, 100]) | |
| function draw() { | |
| // CREATION | |
| svg.selectAll("rect").data(data) | |
| .enter() | |
| .append("rect") | |
| .attr("x", function(d, i) { return x(i); }) | |
| .attr("y", function(d, i) { return 100 - y(d); }) | |
| .attr("height", function(d, i) { return y(d); }) | |
| .attr("width", x.bandwidth() - 1) | |
| .style("fill", "green"); | |
| // UPDATE | |
| svg.selectAll("rect").data(data) | |
| .transition().delay(function(d, i) { return i * 10; }) | |
| .attr("x", function(d, i) { return x(i); }) | |
| .attr("y", function(d, i) { return 100 - y(d); }) | |
| .attr("height", function(d, i) { return y(d); }) | |
| .attr("width", x.bandwidth() - 1) | |
| .style("fill", "blue") | |
| // SUPPRESSION | |
| svg.selectAll("rect").data(data) | |
| .exit() | |
| .style("fill", "red") | |
| // .transition(100) | |
| .remove() | |
| } | |
| draw() | |
| setInterval(function() { | |
| n = Math.floor(Math.random() * 200); | |
| // x.domain(d3.range(n)) | |
| generate_data(n); | |
| draw() | |
| }, 1000) | |
| </script> | |
| </body> |
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