The above grid shows the effect of fisheye distortion. Move the mouse to change the focal point.
forked from mbostock's block: Fisheye Grid
Last active
December 15, 2017 00:21
-
-
Save asifm/22d6ab34d10b19114f5ef6dc4e34efd1 to your computer and use it in GitHub Desktop.
Fisheye Grid
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: gpl-3.0 |
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
| (function() { | |
| d3.fisheye = function() { | |
| var radius = 200, | |
| power = 2, | |
| k0, | |
| k1, | |
| center = [0, 0]; | |
| function fisheye(d) { | |
| var dx = d[0] - center[0], | |
| dy = d[1] - center[1], | |
| dd = Math.sqrt(dx * dx + dy * dy); | |
| if (dd >= radius) return d; | |
| var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25; | |
| return [center[0] + dx * k, center[1] + dy * k]; | |
| } | |
| 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.center = function(_) { | |
| if (!arguments.length) return center; | |
| center = _; | |
| return fisheye; | |
| }; | |
| return rescale(); | |
| }; | |
| })(); |
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> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| path { | |
| fill: none; | |
| stroke: #333; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="fisheye.js"></script> | |
| <script> | |
| 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.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); | |
| svg.on("mousemove", function() { | |
| fisheye.center(d3.mouse(this)); | |
| path.attr("d", function(d) { return line(d.map(fisheye)); }); | |
| }); | |
| </script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment