Based on the d3 fisheye distortion demo, but modified to work well with circos plots:
- Zoom foci constrained to lie in a circle.
- Click to add a new foci.
- Shift-click to remove foci.
-
-
Save mccalluc/d79b37d286212229555d39829e3678ee to your computer and use it in GitHub Desktop.
Fisheye Grid
This file contains hidden or 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: gpl-3.0 |
This file contains hidden or 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
| .idea/ |
This file contains hidden or 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
| (function() { | |
| d3.fisheye = function() { | |
| var radius = 200, | |
| power = 2, | |
| k0, | |
| k1, | |
| foci = [[0, 0]]; | |
| function fisheye(d) { | |
| var x = d[0]; | |
| var y = d[1]; | |
| for (focus of foci) { | |
| var dx = x - focus[0], | |
| dy = y - focus[1], | |
| dd = Math.sqrt(dx * dx + dy * dy); | |
| if (dd < radius) { | |
| var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25; | |
| x = focus[0] + dx * k; | |
| y = focus[1] + dy * k; | |
| } | |
| } | |
| return [x, y]; | |
| } | |
| function rescale() { | |
| k0 = Math.exp(power); | |
| k0 = k0 / (k0 - 1) * radius; | |
| k1 = power / radius; | |
| return fisheye; | |
| } | |
| fisheye.radius = function(_) { | |
| if (!arguments.length) return radius; | |
| radius = +_; | |
| return rescale(); | |
| }; | |
| fisheye.power = function(_) { | |
| if (!arguments.length) return power; | |
| power = +_; | |
| return rescale(); | |
| }; | |
| fisheye.foci = function(_) { | |
| if (!arguments.length) return foci; | |
| foci = _; | |
| return fisheye; | |
| }; | |
| return rescale(); | |
| }; | |
| })(); |
This file contains hidden or 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> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| path { | |
| fill: none; | |
| stroke: #333; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="fisheye.js"></script> | |
| <script> | |
| (function(){ | |
| var width = 960, | |
| height = 500, | |
| xStepsBig = d3.range(10, width, 20), | |
| yStepsBig = d3.range(10, height, 20), | |
| xStepsSmall = d3.range(0, width + 6, 6), | |
| yStepsSmall = d3.range(0, height + 6, 6); | |
| var fisheye = d3.fisheye(); | |
| var line = d3.svg.line(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(-.5,-.5)"); | |
| svg.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.selectAll(".x") | |
| .data(xStepsBig) | |
| .enter().append("path") | |
| .attr("class", "x") | |
| .datum(function(x) { return yStepsSmall.map(function(y) { return [x, y]; }); }); | |
| svg.selectAll(".y") | |
| .data(yStepsBig) | |
| .enter().append("path") | |
| .attr("class", "y") | |
| .datum(function(y) { return xStepsSmall.map(function(x) { return [x, y]; }); }); | |
| var path = svg.selectAll("path") | |
| .attr("d", line); | |
| function find_target(mouse) { | |
| var center = [width / 2, height / 2]; | |
| var r = Math.sqrt(Math.pow(mouse[0]-center[0], 2) + Math.pow(mouse[1]-center[1], 2)); | |
| var scale = Math.min(width, height)/2; | |
| return [ | |
| scale*(mouse[0]-center[0])/r + center[0], | |
| scale*(mouse[1]-center[1])/r + center[1] | |
| ] | |
| } | |
| function zoomer(do_pop) { | |
| return function() { | |
| var target = find_target(d3.mouse(this)); | |
| var foci = fisheye.foci(); | |
| if (do_pop) { | |
| foci.pop(); | |
| } else { | |
| if (d3.event.shiftKey) { | |
| foci.pop(); | |
| remove_closest(foci, target); | |
| } | |
| } | |
| foci.push(target); | |
| fisheye.foci(foci); | |
| path.attr("d", function(d) { return line(d.map(fisheye)); }); | |
| } | |
| } | |
| function remove_closest(foci, target) { | |
| // Modifies foci in-place, removing the element | |
| // which is nearest to target. | |
| var dists = foci.map(function(p, i) { | |
| return { | |
| dist: Math.sqrt(Math.pow(p[0]-target[0], 2) + Math.pow(p[1]-target[1], 2)), | |
| index: i } | |
| }); | |
| var min_dist = Infinity; | |
| var i = false; | |
| for (dist of dists) { | |
| if (dist.dist < min_dist) { | |
| i = dist.index; | |
| } | |
| } | |
| foci.splice(i, 1); | |
| } | |
| svg.on("mousemove", zoomer(true)); | |
| svg.on("click", zoomer(false)); | |
| })() | |
| </script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment