A variation of the click-to-recenter brush with snapping on brushend.
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Click-to-Recenter Brush II
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/click-to-recenter-brush?collection=@d3/d3-brush |
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| <!DOCTYPE html> | |
| <style> | |
| .selected { | |
| fill: red; | |
| stroke: brown; | |
| } | |
| </style> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var randomX = d3.randomUniform(0, 10), | |
| randomY = d3.randomNormal(0.5, 0.12), | |
| data = d3.range(800).map(function() { return [randomX(), randomY()]; }); | |
| var svg = d3.select("svg"), | |
| margin = {top: 194, right: 50, bottom: 214, left: 50}, | |
| width = +svg.attr("width") - margin.left - margin.right, | |
| height = +svg.attr("height") - margin.top - margin.bottom, | |
| g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var x = d3.scaleLinear() | |
| .domain([0, 10]) | |
| .range([0, width]); | |
| var y = d3.scaleLinear() | |
| .range([height, 0]); | |
| var brush = d3.brushX() | |
| .extent([[0, 0], [width, height]]) | |
| .on("start brush", brushed) | |
| .on("end", brushended); | |
| var dot = g.append("g") | |
| .attr("fill-opacity", 0.2) | |
| .selectAll("circle") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { return "translate(" + x(d[0]) + "," + y(d[1]) + ")"; }) | |
| .attr("r", 3.5); | |
| g.append("g") | |
| .call(brush) | |
| .call(brush.move, [3, 5].map(x)) | |
| .selectAll(".overlay") | |
| .each(function(d) { d.type = "selection"; }) // Treat overlay interaction as move. | |
| .on("mousedown touchstart", brushcentered); // Recenter before brushing. | |
| g.append("g") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.axisBottom(x)); | |
| function brushcentered() { | |
| var dx = x(1) - x(0), // Use a fixed width when recentering. | |
| cx = d3.mouse(this)[0], | |
| x0 = cx - dx / 2, | |
| x1 = cx + dx / 2; | |
| d3.select(this.parentNode).call(brush.move, x1 > width ? [width - dx, width] : x0 < 0 ? [0, dx] : [x0, x1]); | |
| } | |
| function brushed() { | |
| if (!d3.event.selection) return; // Ignore empty selections. | |
| var extent = d3.event.selection.map(x.invert, x); | |
| dot.classed("selected", function(d) { return extent[0] <= d[0] && d[0] <= extent[1]; }); | |
| } | |
| function brushended() { | |
| if (!d3.event.sourceEvent) return; // Only transition after input. | |
| if (!d3.event.selection) return; // Ignore empty selections. | |
| var d0 = d3.event.selection.map(x.invert), | |
| d1 = d0.map(Math.round); | |
| // If empty when rounded, use floor & offset instead. | |
| if (d1[0] >= d1[1]) { | |
| d1[0] = Math.floor(d0[0]); | |
| d1[1] = d1[0] + 1; | |
| } | |
| d3.select(this).transition().call(brush.move, d1.map(x)); | |
| } | |
| </script> |
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Hi Mike, I don't know if this is the right place to be asking you this, but can you help me understand why the brush.move will fire in the end two 'end' events?
Thanks, and again, sorry if this is not the right place to do this.