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Update Pattern -- Bars
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <style> | |
| body { margin:20px;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| svg { width: 100%; height: 100%; } | |
| .chart rect { | |
| fill: steelblue; | |
| stroke: red; | |
| } | |
| svg { | |
| border: 2px solid black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // Random values | |
| var t = 1297110663, // start time (seconds since epoch) | |
| v = 70, // start value (subscribers) | |
| data = d3.range(33).map(next); // starting dataset | |
| function next() { | |
| return { | |
| time: ++t, | |
| value: v = ~~Math.max(10, Math.min(90, v + 10 * (Math.random() - .5))) | |
| }; | |
| } | |
| setInterval(function() { | |
| data.shift(); | |
| data.push(next()); | |
| updateData(); | |
| }, 1500); | |
| // ================================== // | |
| // Chart Size | |
| var margin = {top: 20, right: 10, bottom: 20, left: 10}, | |
| svgWidth = 20, | |
| svgHeight = 80, | |
| contentWidth = svgWidth - margin.left - margin.right, | |
| contentHeight = svgHeight - margin.top - margin.bottom; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("class", "chart") | |
| .attr("width", svgWidth * data.length - 1) | |
| .attr("height", svgHeight) | |
| .append("g") | |
| .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); | |
| // Scales | |
| var xScale = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([0, svgWidth]); | |
| var yScale = d3.scale.linear() | |
| .domain([0, 100]) | |
| .rangeRound([0, svgHeight]); | |
| svg.append("line") | |
| .attr("x1", 0) | |
| .attr("x2", svgWidth * data.length) | |
| .attr("y1", svgHeight - .5) | |
| .attr("y2", svgHeight - .5) | |
| .attr("stroke", "#000"); | |
| // Initial Display | |
| updateData(); | |
| function updateData() { | |
| // Data Join | |
| var rect = svg.selectAll("rect") | |
| .data(data, function(d) { return d.time; }); | |
| // Enter… | |
| // ¿¿ Append or insert ?? | |
| rect.enter().append("rect", "line") | |
| .attr("x", function(d, i) { return xScale(i + 1) - .5; }) | |
| .attr("y", function(d) { return svgHeight - yScale(d.value) - .5; }) | |
| .attr("width", svgWidth) | |
| .attr("height", function(d) { return yScale(d.value); }) | |
| .transition() | |
| .duration(750) | |
| .attr("x", function(d, i) { return xScale(i) - .5; }); | |
| // Update… | |
| rect.transition() | |
| .duration(750) | |
| .attr("x", function(d, i) { return xScale(i) - .5; }); | |
| // Exit… | |
| rect.exit().transition() | |
| .duration(750) | |
| .attr("x", function(d, i) { return xScale(i - 2) - .5; }) | |
| .remove(); | |
| } | |
| // Base on: | |
| // https://strongriley.github.io/d3/tutorial/bar-2.html | |
| </script> | |
| </body> |
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