Created
November 8, 2017 21:47
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Curve interpolation comparison, d3.js version 4
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script> | |
| <form> | |
| <select id="interpolations"></select> | |
| <select id="tensions"></select> | |
| <br /> | |
| <svg id="graph"></svg> | |
| </form> | |
| <script> | |
| var width = 400, height = 200, margin = 10; | |
| var numpoints = 8; | |
| var sine = d3.range(0, numpoints + 1).map( | |
| function(i) { | |
| return [ | |
| (2.0 / numpoints) * i * Math.PI, | |
| Math.sin((2.0 / numpoints) * i * Math.PI) | |
| ]; | |
| }); | |
| var xScale = d3.scaleLinear() | |
| .domain(d3.extent(sine, function(d) { | |
| return d[0]; | |
| })) | |
| .range([0, width - margin * 2]); | |
| var yScale = d3.scaleLinear() | |
| .domain([-1, 1]) | |
| .range([height - margin, 0]); | |
| var interpolations = [ | |
| "d3.curveLinear", | |
| "d3.curveLinearClosed", | |
| "d3.curveStep", | |
| "d3.curveStepBefore", | |
| "d3.curveStepAfter", | |
| "d3.curveBasis", | |
| "d3.curveBasisOpen", | |
| "d3.curveBasisClosed", | |
| "d3.curveCardinal", | |
| "d3.curveCardinalOpen", | |
| "d3.curveCardinalClosed", | |
| "d3.curveMonotoneX", | |
| "d3.curveBundle", | |
| "d3.curveCardinal", | |
| "d3.curveCardinalClosed", | |
| "d3.curveCardinalOpen", | |
| ]; | |
| d3.select("#interpolations") | |
| .on("change", redraw) | |
| .selectAll("option") | |
| .data(interpolations) | |
| .enter().append("option") | |
| .attr("value", function(d) { return d; }) | |
| .text(function(d) { return d; }); | |
| var tensions = [1.0, 0.75, 0.5, 0.25, 0.0]; | |
| d3.select("#tensions") | |
| .on("change", redraw) | |
| .selectAll("option") | |
| .data(tensions) | |
| .enter().append("option") | |
| .attr("value", function(d) { return d; }) | |
| .text(function(d) { return d; }); | |
| var svg = d3.select('body') | |
| .append('svg') | |
| .attr('width', width + 2 * margin) | |
| .attr('height', height + 2 * margin); | |
| var graphGroup = svg.append('g') | |
| .attr('transform', 'translate(' + margin + ', ' + | |
| margin + ')'); | |
| redraw(); | |
| function redraw() { | |
| var interpolationSel = document.getElementById('interpolations'); | |
| var interpolation = interpolationSel.options[ | |
| interpolationSel.selectedIndex].value; | |
| graphGroup.selectAll('path').remove(); | |
| var line = d3.line() | |
| .x(function(d) { return xScale(d[0]); }) | |
| .y(function(d) { return yScale(d[1]); }); | |
| switch(interpolation){ | |
| case 'd3.curveBundle': | |
| var tensionsSel = document.getElementById('tensions'); | |
| var tension = tensionsSel.options[ | |
| tensionsSel.selectedIndex].value; | |
| line.curve(eval(interpolation).beta(tension)); | |
| break; | |
| case "d3.curveCardinal": | |
| case "d3.curveCardinalClosed": | |
| case "d3.curveCardinalOpen": | |
| var tensionsSel = document.getElementById('tensions'); | |
| var tension = tensionsSel.options[ | |
| tensionsSel.selectedIndex].value; | |
| line.curve(eval(interpolation).tension(tension)); | |
| break; | |
| default: | |
| line.curve(eval(interpolation)); | |
| break; | |
| } | |
| graphGroup.append('path') | |
| .datum(sine) | |
| .attrs({ | |
| d: line, | |
| stroke: 'steelblue', | |
| 'stroke-width': 2, | |
| fill: 'none' | |
| }); | |
| graphGroup.append("g").selectAll("circle") | |
| .data(sine).enter().append("circle") | |
| .attrs({ | |
| fill: '#fff', | |
| stroke: 'steelblue', | |
| cx: function(d) { return xScale(d[0]); }, | |
| cy: function(d) { return yScale(d[1]); }, | |
| r: 4.5 | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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