This brush snaps to day boundaries. As the user brushes, the brush fires brush events, allowing a listener to adjust the brush extent. Compare this approach to using brush transitions on brushend.
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Brush Snapping II
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .axis text { | |
| font: 11px sans-serif; | |
| } | |
| .axis path { | |
| display: none; | |
| } | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .grid-background { | |
| fill: #ddd; | |
| } | |
| .grid line, | |
| .grid path { | |
| fill: none; | |
| stroke: #fff; | |
| shape-rendering: crispEdges; | |
| } | |
| .grid .minor.tick line { | |
| stroke-opacity: .5; | |
| } | |
| .brush .extent { | |
| stroke: #000; | |
| fill-opacity: .125; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 200, right: 40, bottom: 200, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.time.scale() | |
| .domain([new Date(2013, 2, 1), new Date(2013, 2, 15) - 1]) | |
| .range([0, width]); | |
| var brush = d3.svg.brush() | |
| .x(x) | |
| .extent([new Date(2013, 2, 2), new Date(2013, 2, 3)]) | |
| .on("brush", brushed); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| svg.append("rect") | |
| .attr("class", "grid-background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("g") | |
| .attr("class", "x grid") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| .ticks(d3.time.hours, 12) | |
| .tickSize(-height) | |
| .tickFormat("")) | |
| .selectAll(".tick") | |
| .classed("minor", function(d) { return d.getHours(); }); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| .ticks(d3.time.days) | |
| .tickPadding(0)) | |
| .selectAll("text") | |
| .attr("x", 6) | |
| .style("text-anchor", null); | |
| var gBrush = svg.append("g") | |
| .attr("class", "brush") | |
| .call(brush); | |
| gBrush.selectAll("rect") | |
| .attr("height", height); | |
| function brushed() { | |
| var extent0 = brush.extent(), | |
| extent1; | |
| // if dragging, preserve the width of the extent | |
| if (d3.event.mode === "move") { | |
| var d0 = d3.time.day.round(extent0[0]), | |
| d1 = d3.time.day.offset(d0, Math.round((extent0[1] - extent0[0]) / 864e5)); | |
| extent1 = [d0, d1]; | |
| } | |
| // otherwise, if resizing, round both dates | |
| else { | |
| extent1 = extent0.map(d3.time.day.round); | |
| // if empty when rounded, use floor & ceil instead | |
| if (extent1[0] >= extent1[1]) { | |
| extent1[0] = d3.time.day.floor(extent0[0]); | |
| extent1[1] = d3.time.day.ceil(extent0[1]); | |
| } | |
| } | |
| d3.select(this).call(brush.extent(extent1)); | |
| } | |
| </script> |
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