Click to add new points. Hit the DELETE key to remove the selected point. Use the dropdown menu to change the interpolation mode.
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February 26, 2019 22:35
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Spline Editor
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| redirect: https://observablehq.com/@mbostock/d3-spline-editor |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Spline Editor</title> | |
| <style> | |
| body { | |
| font: 13px sans-serif; | |
| position: relative; | |
| width: 960px; | |
| height: 500px; | |
| } | |
| form { | |
| position: absolute; | |
| bottom: 10px; | |
| left: 10px; | |
| } | |
| rect { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| circle, | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| circle { | |
| fill: #fff; | |
| fill-opacity: .2; | |
| cursor: move; | |
| } | |
| .selected { | |
| fill: #ff7f0e; | |
| stroke: #ff7f0e; | |
| } | |
| </style> | |
| <form> | |
| <label for="interpolate">Interpolate:</label> | |
| <select id="interpolate"></select><br> | |
| </form> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var points = d3.range(1, 5).map(function(i) { | |
| return [i * width / 5, 50 + Math.random() * (height - 100)]; | |
| }); | |
| var dragged = null, | |
| selected = points[0]; | |
| var line = d3.svg.line(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("tabindex", 1); | |
| svg.append("rect") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousedown", mousedown); | |
| svg.append("path") | |
| .datum(points) | |
| .attr("class", "line") | |
| .call(redraw); | |
| d3.select(window) | |
| .on("mousemove", mousemove) | |
| .on("mouseup", mouseup) | |
| .on("keydown", keydown); | |
| d3.select("#interpolate") | |
| .on("change", change) | |
| .selectAll("option") | |
| .data([ | |
| "linear", | |
| "step-before", | |
| "step-after", | |
| "basis", | |
| "basis-open", | |
| "basis-closed", | |
| "cardinal", | |
| "cardinal-open", | |
| "cardinal-closed", | |
| "monotone" | |
| ]) | |
| .enter().append("option") | |
| .attr("value", function(d) { return d; }) | |
| .text(function(d) { return d; }); | |
| svg.node().focus(); | |
| function redraw() { | |
| svg.select("path").attr("d", line); | |
| var circle = svg.selectAll("circle") | |
| .data(points, function(d) { return d; }); | |
| circle.enter().append("circle") | |
| .attr("r", 1e-6) | |
| .on("mousedown", function(d) { selected = dragged = d; redraw(); }) | |
| .transition() | |
| .duration(750) | |
| .ease("elastic") | |
| .attr("r", 6.5); | |
| circle | |
| .classed("selected", function(d) { return d === selected; }) | |
| .attr("cx", function(d) { return d[0]; }) | |
| .attr("cy", function(d) { return d[1]; }); | |
| circle.exit().remove(); | |
| if (d3.event) { | |
| d3.event.preventDefault(); | |
| d3.event.stopPropagation(); | |
| } | |
| } | |
| function change() { | |
| line.interpolate(this.value); | |
| redraw(); | |
| } | |
| function mousedown() { | |
| points.push(selected = dragged = d3.mouse(svg.node())); | |
| redraw(); | |
| } | |
| function mousemove() { | |
| if (!dragged) return; | |
| var m = d3.mouse(svg.node()); | |
| dragged[0] = Math.max(0, Math.min(width, m[0])); | |
| dragged[1] = Math.max(0, Math.min(height, m[1])); | |
| redraw(); | |
| } | |
| function mouseup() { | |
| if (!dragged) return; | |
| mousemove(); | |
| dragged = null; | |
| } | |
| function keydown() { | |
| if (!selected) return; | |
| switch (d3.event.keyCode) { | |
| case 8: // backspace | |
| case 46: { // delete | |
| var i = points.indexOf(selected); | |
| points.splice(i, 1); | |
| selected = points.length ? points[i > 0 ? i - 1 : 0] : null; | |
| redraw(); | |
| break; | |
| } | |
| } | |
| } | |
| </script> |
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Hi @mbostock,
thank you very much for all of your work, documentations, tutorials, examples and any other effort made by you to make it possible for developers like me to learn and use the d3 library.
Just wanted to note that it took me hours to find this example and would be great to add a link to it on the appropriate wiki page https://github.com/mbostock/d3/wiki/SVG-Shapes#line_interpolate
Thanks again !!!