A variation of the drag slider using smooth interpolation.
Smooth Slider
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .ticks { | |
| font: 10px sans-serif; | |
| } | |
| .track, | |
| .track-inset, | |
| .track-overlay { | |
| stroke-linecap: round; | |
| } | |
| .track { | |
| stroke: #000; | |
| stroke-opacity: 0.3; | |
| stroke-width: 10px; | |
| } | |
| .track-inset { | |
| stroke: #ddd; | |
| stroke-width: 8px; | |
| } | |
| .track-overlay { | |
| pointer-events: stroke; | |
| stroke-width: 50px; | |
| cursor: crosshair; | |
| } | |
| .handle { | |
| fill: #fff; | |
| stroke: #000; | |
| stroke-opacity: 0.5; | |
| stroke-width: 1.25px; | |
| } | |
| </style> | |
| <svg width="960" height="500"></svg> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| margin = {right: 50, left: 50}, | |
| width = +svg.attr("width") - margin.left - margin.right, | |
| height = +svg.attr("height"); | |
| var hueActual = 0, | |
| hueTarget = 70, | |
| hueAlpha = 0.2, | |
| hueTimer = d3.timer(hueTween); | |
| var x = d3.scaleLinear() | |
| .domain([0, 180]) | |
| .range([0, width]) | |
| .clamp(true); | |
| var slider = svg.append("g") | |
| .attr("class", "slider") | |
| .attr("transform", "translate(" + margin.left + "," + height / 2 + ")"); | |
| slider.append("line") | |
| .attr("class", "track") | |
| .attr("x1", x.range()[0]) | |
| .attr("x2", x.range()[1]) | |
| .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); }) | |
| .attr("class", "track-inset") | |
| .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); }) | |
| .attr("class", "track-overlay") | |
| .call(d3.drag() | |
| .on("start.interrupt", function() { slider.interrupt(); }) | |
| .on("start drag", function() { hue(x.invert(d3.event.x)); })); | |
| slider.insert("g", ".track-overlay") | |
| .attr("class", "ticks") | |
| .attr("transform", "translate(0," + 18 + ")") | |
| .selectAll("text") | |
| .data(x.ticks(10)) | |
| .enter().append("text") | |
| .attr("x", x) | |
| .attr("text-anchor", "middle") | |
| .text(function(d) { return d + "°"; }); | |
| var handle = slider.insert("circle", ".track-overlay") | |
| .attr("class", "handle") | |
| .attr("r", 9); | |
| function hue(h) { | |
| hueTarget = h; | |
| hueTimer.restart(hueTween); | |
| } | |
| function hueTween() { | |
| var hueError = hueTarget - hueActual; | |
| if (Math.abs(hueError) < 1e-3) hueActual = hueTarget, hueTimer.stop(); | |
| else hueActual += hueError * hueAlpha; | |
| handle.attr("cx", x(hueActual)); | |
| svg.style("background-color", d3.hsl(hueActual, 0.8, 0.8)); | |
| } | |
| </script> |
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