Drag to draw a line!
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September 19, 2024 23:09
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Line Drawing
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/draw-me |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| </style> | |
| <svg width="960" height="500"> | |
| <rect fill="#fff" width="100%" height="100%"></rect> | |
| </svg> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var line = d3.line() | |
| .curve(d3.curveBasis); | |
| var svg = d3.select("svg") | |
| .call(d3.drag() | |
| .container(function() { return this; }) | |
| .subject(function() { var p = [d3.event.x, d3.event.y]; return [p, p]; }) | |
| .on("start", dragstarted)); | |
| function dragstarted() { | |
| var d = d3.event.subject, | |
| active = svg.append("path").datum(d), | |
| x0 = d3.event.x, | |
| y0 = d3.event.y; | |
| d3.event.on("drag", function() { | |
| var x1 = d3.event.x, | |
| y1 = d3.event.y, | |
| dx = x1 - x0, | |
| dy = y1 - y0; | |
| if (dx * dx + dy * dy > 100) d.push([x0 = x1, y0 = y1]); | |
| else d[d.length - 1] = [x1, y1]; | |
| active.attr("d", line); | |
| }); | |
| } | |
| </script> |
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