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| redirect: https://observablehq.com/d/a214f3ade57f16cc |
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| <!DOCTYPE html> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| originX = width / 2, | |
| originY = height / 2; | |
| svg.selectAll("circle") | |
| .data([{x: 0, y: 0}]) | |
| .enter().append("circle") | |
| .attr("cx", function(d) { return fromCartesianX(d.x); }) | |
| .attr("cy", function(d) { return fromCartesianY(d.y); }) | |
| .attr("r", 20) | |
| .call(d3.drag() | |
| .subject(function(d) { return {x: fromCartesianX(d.x), y: fromCartesianY(d.y)}; }) | |
| .on("drag", dragged)); | |
| function fromCartesianX(x) { | |
| return originX + x; | |
| } | |
| function fromCartesianY(y) { | |
| return originY - y; | |
| } | |
| function toCartesianX(x) { | |
| return x - originX; | |
| } | |
| function toCartesianY(y) { | |
| return -y + originY; | |
| } | |
| function dragged(d) { | |
| d.x = toCartesianX(d3.event.x); | |
| d.y = toCartesianY(d3.event.y); | |
| d3.select(this).attr("cx", d3.event.x).attr("cy", d3.event.y); | |
| } | |
| </script> |
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