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horizontal axis brush
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| <!DOCTYPE html> | |
| <svg width="960" height="400"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| margin = {top: 20, right: 30, bottom: 30, left: 40}, | |
| radius = 16, | |
| xDomain = [-500, 500], | |
| yDomain = [0, 100], | |
| _runtimeBrushes = [{id: 1, extents: []}, {id: 2, extents: []}]; | |
| var color = d3.scaleOrdinal() | |
| .range(d3.schemeCategory20); | |
| var xScale = d3.scaleLinear() | |
| .domain(xDomain) | |
| .range([0, width - margin.left - margin.right]); | |
| var yScale = d3.scaleLinear() | |
| .domain(yDomain) | |
| .range([height, 0]); | |
| var xAxis = d3.axisBottom(xScale); | |
| var yAxis = d3.axisLeft(yScale); | |
| var chartContainer = svg | |
| .attr('width', (width + margin.right + margin.left)) | |
| .attr('height', (height + margin.top + margin.bottom)) | |
| .append('g') | |
| .attr('id', 'chartcontainer') | |
| .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')'); | |
| var xAxisEl = chartContainer.append('g') | |
| .attr('class', 'x axis') | |
| .attr('transform', 'translate(0,' + height + ')') | |
| .call(xAxis) | |
| var yAxisEl = chartContainer.append('g') | |
| .attr('class', 'y axis') | |
| .call(yAxis); | |
| var drawarea = chartContainer.append('g') | |
| .attr('class', 'draw-area') | |
| .attr('width', width) | |
| .attr('height', height) | |
| drawSamplePoints(); | |
| var brushFn = d3.brushX() | |
| .extent([[0, -height], [width, 16]]) | |
| .on("end", function(d,i,j){ | |
| filter(d,i,j); | |
| }); | |
| xAxisEl.call(brushFn); | |
| function drawSamplePoints() { | |
| sampleData = d3.range(100).map(function () { | |
| return { | |
| x: Math.floor(Math.random() * (xDomain[1] - xDomain[0] -40) + xDomain[0] + 40), | |
| y: Math.floor(Math.random() * (yDomain[1] - yDomain[0] - 10) + yDomain[0] + 10) | |
| }; | |
| }); | |
| drawarea.selectAll("circle") | |
| .data(sampleData) | |
| .enter().append("circle") | |
| .attr("cx", function (d) { | |
| return xScale(d.x); | |
| }) | |
| .attr("cy", function (d) { | |
| return yScale(d.y); | |
| }) | |
| .attr("opacity", 0.8) | |
| .style("pointer-events", "none") | |
| .attr("r", radius) | |
| .style("fill", function (d, i) { | |
| return color(i); | |
| }) | |
| .style("stroke", function (d, i) { | |
| return color(i); | |
| }) | |
| } | |
| function filter(d,i,j) { | |
| var _sel = d3.brushSelection(j[i])? [xScale.invert(d3.brushSelection(j[i])[0]),xScale.invert(d3.brushSelection(j[i])[1])] : []; | |
| drawarea.selectAll("circle") | |
| .style("fill", function (d, i) { | |
| return validCircle(d,_sel) ? color(i) : "#efefef"; | |
| }) | |
| } | |
| function validCircle(_circle,_selection) { | |
| return _selection.length === 0 || _selection[0] <= _circle.x && _circle.x <= _selection[1]; | |
| } | |
| </script> |
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