Built with blockbuilder.org
Last active
December 8, 2019 10:51
-
-
Save AlexisPister/c60d570d6739a28dfd8ba0c9eae76866 to your computer and use it in GitHub Desktop.
scatter drag
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
| license: mit |
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> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| let width = 960, | |
| height = 500, | |
| radius = 3, | |
| transform = d3.zoomIdentity | |
| let canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height) | |
| let ctx = canvas.node().getContext("2d"); | |
| let data = d3.range(200) | |
| .map(() => { return {"x": d3.randomNormal()(), | |
| "y": d3.randomNormal()()}}) | |
| let scaleX = d3.scaleLinear() | |
| .domain(d3.extent(data, function(d){return d.x})) | |
| .range([0, width]) | |
| let scaleY = d3.scaleLinear() | |
| .domain(d3.extent(data, function(d){return d.y})) | |
| .range([height, 0]) | |
| //canvas.call(d3.zoom() | |
| // .on("zoom", zoomed)) | |
| canvas.call(d3.drag() | |
| .subject(dragSubject) | |
| .on("drag", dragged)) | |
| function zoomed(){ | |
| transform = d3.event.transform | |
| render() | |
| } | |
| function dragSubject(){ | |
| x = d3.event.x | |
| y = d3.event.y | |
| for(let i = 0; i < data.length; i++){ | |
| console.log("loop") | |
| point = data[i] | |
| dx = x - scaleX(point.x) | |
| dy = y - scaleY(point.y) | |
| if (dx * dx + dy * dy < radius * radius){ | |
| /* | |
| console.log("print") | |
| console.log(d3.event.x) | |
| console.log(d3.event.y) | |
| console.log(point) | |
| console.log(scaleX(point.x)) | |
| console.log(scaleY(point.y)) */ | |
| return data[i]; | |
| } | |
| } | |
| } | |
| function dragged(){ | |
| console.log("PRINT") | |
| console.log(d3.event.subject.x) | |
| console.log(scaleX.invert(d3.event.x)) | |
| console.log(d3.event.x) | |
| d3.event.subject.x = scaleX.invert(d3.event.x) | |
| d3.event.subject.y = scaleY.invert(d3.event.y) | |
| render() | |
| } | |
| function render(){ | |
| ctx.save() | |
| ctx.clearRect(0, 0, width, height) | |
| ctx.beginPath() | |
| //ctx.translate(transform.x, transform.y) | |
| //ctx.scale(transform.k, transform.k) | |
| data.forEach(function(d){ | |
| ctx.moveTo(scaleX(d.x) + radius, scaleY(d.y)) | |
| ctx.arc(scaleX(d.x), scaleY(d.y), radius, 0, Math.PI * 2) | |
| }) | |
| ctx.stroke() | |
| /* | |
| ctx.globalAlpha = 0.2 | |
| ctx.fillStyle = "blue" | |
| ctx.fillRect(0,0,width,height) */ | |
| ctx.restore() | |
| } | |
| render() | |
| </script> | |
| </body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment