A demo of d3.interpolateZoom. Added in release 3.3, zoom interpolation is now supported automatically for the zoom behavior. See also the zoom transitions and map zooming examples.
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van Wijk Smooth Zooming
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license: gpl-3.0 | |
redirect: https://observablehq.com/@d3/smooth-zooming |
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!function(){d3.hexbin=function(){function u(n){var r={};return n.forEach(function(n,t){var a=s.call(u,n,t)/o,e=Math.round(a),c=h.call(u,n,t)/i-(1&e?.5:0),f=Math.round(c),l=a-e;if(3*Math.abs(l)>1){var v=c-f,g=f+(f>c?-1:1)/2,m=e+(e>a?-1:1),M=c-g,d=a-m;v*v+l*l>M*M+d*d&&(f=g+(1&e?1:-1)/2,e=m)}var j=f+"-"+e,p=r[j];p?p.push(n):(p=r[j]=[n],p.i=f,p.j=e,p.x=(f+(1&e?.5:0))*i,p.y=e*o)}),d3.values(r)}function a(r){var t=0,u=0;return n.map(function(n){var a=Math.sin(n)*r,e=-Math.cos(n)*r,i=a-t,o=e-u;return t=a,u=e,[i,o]})}var e,i,o,c=1,f=1,h=r,s=t;return u.x=function(n){return arguments.length?(h=n,u):h},u.y=function(n){return arguments.length?(s=n,u):s},u.hexagon=function(n){return arguments.length<1&&(n=e),"m"+a(n).join("l")+"z"},u.centers=function(){for(var n=[],r=0,t=!1,u=0;f+e>r;r+=o,t=!t,++u)for(var a=t?i/2:0,h=0;c+i/2>a;a+=i,++h){var s=[a,r];s.i=h,s.j=u,n.push(s)}return n},u.mesh=function(){var n=a(e).slice(0,4).join("l");return u.centers().map(function(r){return"M"+r+"m"+n}).join("")},u.size=function(n){return arguments.length?(c=+n[0],f=+n[1],u):[c,f]},u.radius=function(n){return arguments.length?(e=+n,i=2*e*Math.sin(Math.PI/3),o=1.5*e,u):e},u.radius(1)};var n=d3.range(0,2*Math.PI,Math.PI/3),r=function(n){return n[0]},t=function(n){return n[1]}}(); |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.mesh { | |
fill: none; | |
stroke: #000; | |
stroke-width: .25px; | |
} | |
.start { | |
fill: none; | |
stroke: brown; | |
} | |
.end { | |
fill: none; | |
stroke: steelblue; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="d3.hexbin.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
radius = 10; | |
var p0 = [250, 200, 60], | |
p1 = [560, 300, 120]; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.call(transition, p0, p1); | |
svg.append("path") | |
.attr("class", "mesh") | |
.attr("d", d3.hexbin() | |
.size([width, height]) | |
.radius(radius) | |
.mesh); | |
svg.selectAll("circle") | |
.data([p0, p1]) | |
.enter().append("circle") | |
.attr("class", function(d, i) { return i ? "end" : "start"; }) | |
.attr("cx", function(d) { return d[0]; }) | |
.attr("cy", function(d) { return d[1]; }) | |
.attr("r", function(d) { return d[2] / 2 - .5; }); | |
function transition(svg, start, end) { | |
var center = [width / 2, height / 2], | |
i = d3.interpolateZoom(start, end); | |
svg | |
.attr("transform", transform(start)) | |
.transition() | |
.delay(250) | |
.duration(i.duration * 2) | |
.attrTween("transform", function() { return function(t) { return transform(i(t)); }; }) | |
.each("end", function() { d3.select(this).call(transition, end, start); }); | |
function transform(p) { | |
var k = height / p[2]; | |
return "translate(" + (center[0] - p[0] * k) + "," + (center[1] - p[1] * k) + ")scale(" + k + ")"; | |
} | |
} | |
</script> |
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