Move the slider to choose the angle of the x-axis labels.
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August 29, 2015 14:19
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Rotating D3 Axis Labels with Slider
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .scale { | |
| position: absolute; | |
| top: 202px; | |
| left: 20px; | |
| width: 840px; | |
| height: 8px; | |
| box-shadow: inset 0px 0px 1px 19px white, inset 0px 0 0 19px black; | |
| background-color: #f2f2f2; | |
| padding: 20px 40px; | |
| } | |
| .slider { | |
| position: absolute; | |
| top: 14px; | |
| left: 21px; | |
| width: 20px; | |
| height: 20px; | |
| background-color: white; | |
| outline: 1px solid #999; | |
| box-shadow: 0px 1px 1px 0px black; | |
| } | |
| svg { | |
| -webkit-user-select: none; | |
| -moz-user-select: none; | |
| -ms-user-select: none; | |
| } | |
| .axis text { | |
| font: 11px sans-serif; | |
| } | |
| .axis line, | |
| .axis path { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <body> | |
| <div class="scale"> | |
| <div class="slider" draggable="false"></div> | |
| </div> | |
| </body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 250, right: 40, bottom: 250, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom | |
| var x = d3.scale.linear() | |
| .domain([-90, 90]) | |
| .range([0, width]) | |
| var xAxis = d3.svg.axis() | |
| .ticks(19) | |
| .scale(x) | |
| 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("g") | |
| .attr("class", "x axis") | |
| .call(xAxis) | |
| var rotateXLabels = function(deg) { | |
| var axis = d3.select('.x').selectAll('text') | |
| var rotateLabel = function() { | |
| var d3Label = d3.select(this), | |
| sign = Math.sign(deg) | |
| // get coordinates and dimensions of this | |
| bBox = this.getBBox(), | |
| width = bBox.width, | |
| height = bBox.height, | |
| bx = d3Label.attr('data-bx') || bBox.x, | |
| by = d3Label.attr('data-by') || bBox.y, | |
| // convert to radians | |
| rad = Math.abs(deg) * Math.PI/180, | |
| anchor = 'middle' | |
| /* move along non-hypoteneuse sides of triangle created by connecting | |
| ** top right corner of rotated label with top center of original. | |
| */ | |
| if (sign === -1) { | |
| var | |
| dy = Math.sin(rad) * width/2, | |
| shift = Math.sqrt(Math.pow(width,2) + Math.pow(width/2,2) - Math.pow(width,2) * Math.cos(rad) ), | |
| dx = - Math.sqrt(Math.pow(shift,2) - Math.pow(dy,2)) | |
| } | |
| /* move along non-hypoteneuse sides of triangle created by extending | |
| ** left side of rotated label to meet in right angle with line | |
| ** extended from top center of original. | |
| */ | |
| else if (sign === 1) { | |
| var | |
| dy = - Math.cos(Math.PI/2 - rad) * width/2, | |
| dx = Math.sin(Math.PI/2 - rad) * width/2 | |
| } | |
| // don't move. But reset the anchor. | |
| else { | |
| var | |
| dy = height/2, | |
| dx = 0 | |
| anchor = 'start' | |
| } | |
| d3Label | |
| .attr('transform', 'rotate('+deg+' '+bx+' '+by+')') | |
| .attr('x', 0) | |
| // add padding | |
| .attr('y', 16.1) | |
| .attr('dx', dx + 4 * sign) | |
| .attr('dy', dy - height/2) | |
| .attr('text-anchor', anchor) | |
| .attr('data-bx', bx) | |
| .attr('data-by', by) | |
| } | |
| // rotate each member of x-axis | |
| axis.each(rotateLabel) | |
| } | |
| !function slider() { | |
| var scale = d3.select('.scale'), | |
| slide = d3.select('.slider'), | |
| pos = parseInt(slide.style('left')), | |
| posMin = pos, | |
| posMax = parseInt(scale.style('width')) + pos + slide.node().clientWidth, | |
| range = posMax - posMin, | |
| degrees | |
| scale.on('mousedown', function() { | |
| // check if mouse is on slider handle | |
| var onSlider = d3.event.target === slide.node() ? true : false | |
| slide.on('mouseenter', function() { onSlider = true }) | |
| slide.on('mouseexit', function() { onSlider = false }) | |
| // move slider | |
| scale.on('mousemove', function() { | |
| // find mouse position | |
| pos = d3.event.pageX - 40 | |
| // keep within range | |
| if (pos < posMin || pos > posMax) { | |
| slide.style('left', pos < posMin ? posMin : posMax) | |
| degrees = pos < posMin ? -90 : 90 | |
| } | |
| // set position | |
| else if (onSlider) { | |
| slide.style('left', pos + 'px') | |
| degrees = (pos - posMin) * 180/range - 90 | |
| } | |
| rotateXLabels(degrees) | |
| }) | |
| }) | |
| // cleanup listeners | |
| d3.select('body').on('mouseup', function() { | |
| scale.on('mousemove', null) | |
| slide.on('mouseenter', null) | |
| slide.on('mouseexit', null) | |
| }) | |
| }() | |
| rotateXLabels(-90) | |
| </script> |
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