This is an implementation of multiple no collision brushes in D3js.
Learn more here.
This is a modified version of Mike Bostock's Snapping brush.
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Multiple No Collision Brushes in D3js
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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="http://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 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); | |
| //brushes container | |
| var gBrushes = svg.append('g') | |
| .attr("class", "brushes"); | |
| //keep track of existing brushes | |
| var brushes = []; | |
| //return an array that contains the closest brush edge to the left and right | |
| function getBrushesAround(brush, brushes) { | |
| var edge = []; | |
| if(brush.extent.start === undefined) | |
| brush.extent.start = brush.extent(); | |
| brushes.forEach(function(otherBrush) { | |
| var otherBrush_extent = otherBrush.extent(); | |
| if (otherBrush !== brush) { | |
| if (brush.extent.start !== undefined | |
| && otherBrush_extent[1].getTime() <= brush.extent.start[0].getTime()) { | |
| if (edge[0] !== undefined && otherBrush_extent[1].getTime() > edge[0].getTime() || edge[0] === undefined) | |
| edge[0] = otherBrush_extent[1]; | |
| } else if (brush.extent.start !== undefined | |
| && otherBrush_extent[0].getTime() > brush.extent.start[0].getTime()) { | |
| if (edge[1] !== undefined && otherBrush_extent[0].getTime() < edge[1].getTime() || edge[1] === undefined) | |
| edge[1] = otherBrush_extent[0]; | |
| } | |
| } | |
| }); | |
| return edge; | |
| } | |
| //new brush handler | |
| function newBrush() { | |
| var brush = d3.svg.brush() | |
| .x(x) | |
| .on("brush", brushed) //Make sure don't pass surrounding brushes | |
| .on("brushend", brushend); //Keep track of what brushes is surrounding | |
| brushes.push({id: brushes.length, brush: brush}); | |
| function brushstart() { | |
| if (d3.event.sourceEvent) | |
| brush.mouseStart = d3.event.sourceEvent.x; | |
| if(brush.extent.start == undefined){ | |
| d3.event.sourceEvent.x; | |
| } | |
| }; | |
| 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]); | |
| } | |
| } | |
| //Make sure no collision | |
| //find out what surrounds this brush | |
| var edge = getBrushesAround(brush, brushes.map(function(d){return d.brush})); | |
| //if the current block gets brushed beyond the surrounding block, limit it so it does not go past | |
| if (edge[1] !== undefined && extent1[1].getTime() > edge[1].getTime()) { | |
| extent1[1] = edge[1]; | |
| //if we are moving, not only do we stop it from going past, but also keep the brush the same size | |
| if (d3.event.mode === "move") | |
| extent1[0] = d3.time.hour.offset(extent1[1], -Math.round((brush.extent.start[1] - brush.extent.start[0]) / 3600000)); | |
| } else if (edge[0] !== undefined && extent1[0].getTime() < edge[0].getTime()) { | |
| extent1[0] = edge[0]; | |
| if (d3.event.mode === "move") | |
| extent1[1] = d3.time.hour.offset(extent1[0], Math.round((brush.extent.start[1] - brush.extent.start[0]) / 3600000)); | |
| } | |
| d3.select(this).call(brush.extent(extent1)); | |
| } | |
| function brushend() { | |
| //add a new brush as needed | |
| var lastBrushExtent = brushes[brushes.length - 1].brush.extent(); | |
| if (lastBrushExtent[0].getTime() != lastBrushExtent[1].getTime()) | |
| newBrush(); | |
| //keep track of current loc for comparison later | |
| brush.extent.start = brush.extent(); | |
| update(); | |
| } | |
| } | |
| function update() { | |
| var gBrush = gBrushes | |
| .selectAll('.brush') | |
| .data(brushes, function (d){return d.id}); | |
| gBrush.enter() | |
| .insert("g", '.brush') | |
| .attr('class', 'brush') | |
| .each(function(brushWrapper) { | |
| //call the brush | |
| brushWrapper.brush(d3.select(this)); | |
| }); | |
| gBrush | |
| .each(function (brushWrapper,i){ | |
| d3.select(this) | |
| .attr('class', 'brush brush-'+i) | |
| .selectAll('.background') | |
| .style('pointer-events', function() { | |
| var brush = brushWrapper.brush; | |
| return i === brushes.length-1 && | |
| brush !== undefined && | |
| brush.extent()[0].getTime() === brush.extent()[1].getTime() | |
| ? 'all' : 'none'; | |
| }); | |
| }) | |
| gBrush.selectAll('rect') | |
| .attr("height", height); | |
| gBrush.exit() | |
| .remove(); | |
| } | |
| newBrush(); | |
| update(); | |
| </script> |
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Hi - thanks so much for posting this! I'm very new to D3.js and have been trying (unsuccessfully) to build on this so that the user can delete one of the brushed areas. I found this SO post but I'm unsure how to implement when there are multiple brushed areas. Any help appreciated, and thanks again for the code!