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Cartesian Distortion (Fisheye)
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v2.min.js"></script> | |
| <style> | |
| #chart3 { | |
| width: 960px; | |
| height: 180px; | |
| border: solid 1px #ccc; | |
| } | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| #chart3 line { | |
| shape-rendering: crispEdges; | |
| } | |
| #chart3 line { | |
| fill: none; | |
| stroke: #333; | |
| } | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <p id="chart3"></p> | |
| <script> | |
| (function() { | |
| d3.fisheye = { | |
| scale: function(scaleType) { | |
| return d3_fisheye_scale(scaleType(), 3, 0); | |
| }, | |
| circular: function() { | |
| var radius = 200, | |
| distortion = 2, | |
| k0, | |
| k1, | |
| focus = [0, 0]; | |
| function fisheye(d) { | |
| var dx = d.x - focus[0], | |
| dy = d.y - focus[1], | |
| dd = Math.sqrt(dx * dx + dy * dy); | |
| if (!dd || dd >= radius) return {x: d.x, y: d.y, z: 1}; | |
| var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25; | |
| return {x: focus[0] + dx * k, y: focus[1] + dy * k, z: Math.min(k, 10)}; | |
| } | |
| function rescale() { | |
| k0 = Math.exp(distortion); | |
| k0 = k0 / (k0 - 1) * radius; | |
| k1 = distortion / radius; | |
| return fisheye; | |
| } | |
| fisheye.radius = function(_) { | |
| if (!arguments.length) return radius; | |
| radius = +_; | |
| return rescale(); | |
| }; | |
| fisheye.distortion = function(_) { | |
| if (!arguments.length) return distortion; | |
| distortion = +_; | |
| return rescale(); | |
| }; | |
| fisheye.focus = function(_) { | |
| if (!arguments.length) return focus; | |
| focus = _; | |
| return fisheye; | |
| }; | |
| return rescale(); | |
| } | |
| }; | |
| function d3_fisheye_scale(scale, d, a) { | |
| function fisheye(_) { | |
| var x = scale(_), | |
| left = x < a, | |
| v, | |
| range = d3.extent(scale.range()), | |
| min = range[0], | |
| max = range[1], | |
| m = left ? a - min : max - a; | |
| if (m == 0) m = max - min; | |
| return (left ? -1 : 1) * m * (d + 1) / (d + (m / Math.abs(x - a))) + a; | |
| } | |
| fisheye.distortion = function(_) { | |
| if (!arguments.length) return d; | |
| d = +_; | |
| return fisheye; | |
| }; | |
| fisheye.focus = function(_) { | |
| if (!arguments.length) return a; | |
| a = +_; | |
| return fisheye; | |
| }; | |
| fisheye.copy = function() { | |
| return d3_fisheye_scale(scale.copy(), d, a); | |
| }; | |
| fisheye.nice = scale.nice; | |
| fisheye.ticks = scale.ticks; | |
| fisheye.tickFormat = scale.tickFormat; | |
| return d3.rebind(fisheye, scale, "domain", "range"); | |
| } | |
| })(); | |
| (function chart3() { | |
| console.clear() | |
| var width = 960, | |
| height = 180, | |
| xSteps = d3.range(0, width, 16), | |
| ySteps = d3.range(0, height, 16); | |
| var xFisheye = d3.fisheye.scale(d3.scale.identity).domain([0, width]).focus(0), | |
| yFisheye = d3.scale.linear().domain([0, height]); | |
| var svg = d3.select("#chart3").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); | |
| var xLine = svg.selectAll(".x") | |
| .data(xSteps) | |
| .enter().append("line") | |
| .attr("class", "x") | |
| .attr("y2", height); | |
| redraw(); | |
| svg.on("mousemove", function() { | |
| var mouse = d3.mouse(this); | |
| xFisheye.focus(mouse[0]); | |
| yFisheye(mouse[1]); | |
| redraw(); | |
| }); | |
| function redraw() { | |
| xLine.attr("x1", xFisheye).attr("x2", xFisheye); | |
| } | |
| })(); | |
| </script> | |
| </body> |
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